JP7708358B2 - Earthquake-resistant M-shaped steel frame for upper floors - Google Patents

Description

This invention relates to an earthquake-resistant frame for installation on floors above the second floor in a steel frame structure.

The framework used in steel-frame construction is primarily made up of steel columns and beams, with braces and trusses added as needed.

Braces and trusses are used to reinforce steel structures, and reinforcing materials such as braces and trusses are widely used in buildings that require high earthquake resistance.

Conventionally, for braces to be installed in an area surrounded by the upper and lower beams and two steel columns of a steel frame structure, the following have been used: an X-shaped earthquake-resistant frame in which both ends of the brace are connected to gusset plates welded to the opposing side surfaces of the two columns (the top of one column and the bottom of the other column) with high-strength bolts to secure them in an X shape; or a K-shaped earthquake-resistant frame in which two braces within the frame are arranged in a K shape.

In the case of the X-shaped earthquake-resistant frame, a brace (generally made from round bars or flat steel plate) is arranged in an X shape between two pillars, so if you want to create an opening such as a window or balcony between the two pillars, there are restrictions on the location and size of the window or balcony.

Furthermore, the diameter of the pilot holes for the high-strength bolts formed in the gusset plates and braces has traditionally required a high level of precision, about the bolt diameter plus 1 mm, to minimize wobble between the gusset plates and braces. As a result, the task of accurately welding the gusset plates to the side of the columns requires skilled techniques and time, which has led to problems such as increased time and costs.

Furthermore, in the case of the K-shaped earthquake-resistant frame, the fixing points of the two braces are limited to the upper and lower ends of one column and the center of the other column, which creates the problem that in order to increase earthquake resistance, the spacing between the left and right frames must be made wider or sturdy brace members must be used.

This invention has been made in consideration of the above-mentioned problems, and has as its object to manufacture a high-precision earthquake-resistant frame by producing the frame in a factory using jigs, and to provide an earthquake-resistant frame that is narrow and compact in width in order to form wide and large openings for windows, doorways, etc. in steel-framed structures.

Furthermore, the present invention aims to provide a compact and strong earthquake-resistant frame by sandwiching a brace made of square steel pipes between two plates welded to the opposing side surfaces of two left and right columns.

In order to solve such problems, the present invention provides an earthquake-resistant frame for earthquake-proofing a steel frame building, comprising a first steel column (11) and a second steel column (12) each having two identical square steel pipes, each having a side length of 100 mm, a thickness of 4.5 mm and a length of 2257 mm, arranged in parallel at intervals of 700 mm; an upper end plate (51 ) made of a square flat steel plate having a side length of 100 mm and a thickness of 9 mm, with four bolt holes (60) formed at the four corners of the upper end plate (51) to be welded to the steel column upper end (A) (70) of the first steel column (11); and a lower end plate (48) having four bolt holes (81) formed at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm, for welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48). The lower end plate (48) has four bolt holes (81) formed in the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm, for welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48) . and a beam fixing plate (A) (38) having four bolt holes (61) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width, and 9 mm in thickness for welding to the lower end (B) (88) of the second steel column (12). A beam fixing plate (B) (42) having four bolt holes (62) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width, and 9 mm in thickness for welding to the lower end (B) (88) of the second steel column ( 12). The end of the first brace (33) is sandwiched in the upper end on the center line of the plate mounting surface (A) (41) of the first steel column (11). The trapezoidal brace fixing upper end plate (28) having a thickness of 6 mm is formed so that it can be overlapped and welded to the brace. The side (A) (100) of the trapezoidal brace fixing upper end plate (28) has a dimension of 86 mm, a dimension of 90 mm, an angle (A) at which the side (A) (100) and the side (B) (101) intersect at 239.8 degrees, a dimension of the side (C) (102) is 70 mm, an angle at which the side (B) (101) and the side (C) (102) intersect at 90 degrees, a dimension of the steel column mounting portion (103) is 140 mm, an angle at which the steel column mounting portion (103) and the side (C) (102) intersect at 90 degrees, an angle at which the steel column mounting portion (103) and the side (A) (100) intersect at 100 degrees, and an angle at which the steel column mounting portion (103) and the side (A) (100) intersect at 100 degrees. The angle (B) between the first brace (33) and the side (BB) (181) of the overlapping portion is formed to be 12 mm in order to weld the sides (A) (100) of the two identically shaped brace fixing upper end plates (28) together in a sandwich-like manner, and the overlap width (A) (130) of the side (BB) (181) of the first brace (33) of the overlapping portion is formed to be 12 mm in order to weld the sides (A) (100) of the two identically shaped brace fixing upper end plates (28) together in a sandwich-like manner. Similarly, the overlap width (B) (131) of the side (CC) (182) of the first brace (33) of the overlapping portion is formed to be 55 mm in order to weld the sides (CC) (182) of the first brace (33) together in a sandwich-like manner. Furthermore, the second brace (34) and the third brace (35) are formed in the upper and lower central portions on the center line of the plate mounting surface (A) (41). In order to sandwich and weld the ends of the brace (35) of the first brace (34) together, the upper and lower central plates (29) for fixing the braces are formed from a rectangular plate with a thickness of 6 mm, with the side (E) (104) measuring 70 mm, the side (F) (105) measuring 230 mm, the side (G) (106) measuring 70 mm, and the steel column mounting portion (107) measuring 230 mm. The steel column mounting portion (107) is abutted against the upper and lower central portions of the plate mounting surface (A) (41) and welded to the plate mounting surface (A) (41). Furthermore, the side (FF) (185) of the second brace (34) is welded to the side (FF) (185) of the upper and lower central plates (29) for fixing the braces. The edge (KK) (190) of the third brace (35) is brought into contact with the tip where the edge (E) (104) and edge (F) (105) intersect, and the overlap width (C) (132) of the sandwich-shaped overlapping welded joint is formed to a dimension of 74 mm. Similarly, the overlap width (D) (133) of the edge (GG) (186) of the overlapping portion to be sandwiched and welded jointed is formed to a dimension of 13 mm. Furthermore, the edge (KK) (190) of the third brace (35) is brought into contact with the tip where the edge (F) (105) and edge (G) (106) of the upper and lower central plates (29) for fixing the brace, which are formed to the same shape, intersect, and a sandwich-shaped overlap width (C) (132) of the third brace (35) is formed to a dimension of 74 mm. The overlap width (F) (135) of the overlapping portion, which is sandwiched between the plate mounting surface (A) (41) and welded, is formed to a dimension of 75 mm, and similarly, the overlap width (E) (134) of the side (JJ) (189) of the overlapping portion, which is to be sandwiched and welded, is formed to a dimension of 13 mm. Furthermore, in order to overlap and weld the end of the fourth brace (36) so as to be sandwiched between the plate mounting surface (A) (41) and the lower end of the plate mounting surface (A) (41) on the center line of the plate mounting surface (A) (41), the tip where the side (K) (110) and the steel column mounting portion (111) intersect is abutted against the lower end of the plate mounting surface (A) (41), and the steel frame mounting portion (111) is attached to the plate mounting surface (A) (41). The brace fixing lower end plate (30) thus constructed by welding has a side (I) (108) dimension of 70 mm, a side (J) (109) dimension of 90 mm, an intersecting angle between the side (I) (108) and the side (J) (109) of 90 degrees, a side (K) (110) dimension of 86 mm, an intersecting angle (C) between the side (K) (110) and the side (J) (109) of 234.5 degrees, an intersecting angle (D) between the steel frame column mounting portion (111) and the side (K) (110) of 305.5 degrees, and a dimension of the steel frame column mounting portion (111) of 140 mm. The portion sandwiched between the two brace fixing lower end plates (30) is formed. The overlap width (G) (136) of the side (NN) (193) of the fourth brace (36) is 55 mm, and similarly, the overlap width (H) (137) is a portion for welding the side (OO) (194) of the fourth brace (36) to the side (K) (110) of the brace fixing lower end plate (30) so that the side (OO) (194) is overlapped with the side (K) (110) of the brace fixing lower end plate (30) so as to be welded in a sandwich shape. The overlap width (H) (137) of the brace fixing lower plate (30) is 12 mm, and the first brace (33) is attached to the plate mounting surface (B) (40) of the second steel column (12) at a quarter position from the upper end on the center line of the plate mounting surface (B) (40). In order to sandwich and weld the ends of the first brace (34) together, the brace fixing upper plate (31) made of a rectangular plate with a thickness of 6 mm has a side (M) (112) dimension of 70 mm, a side (P) (115) dimension of 230 mm, a side (O) (114) dimension of 70 mm, and a steel column mounting portion (113) dimension of 230 mm. The side (BB) (181) of the first brace (33) is abutted against the tip where the side (M) (112) and the side (P) (115) intersect, and the overlapping side (BB) (182) is welded together so as to sandwich and weld the ends of the first brace (34) together. Similarly, the overlap width (J) (139) of the side (CC) (182) of the first brace (33) is formed to a dimension of 12 mm in order to overlap and weld the sides (CC) (182) so as to sandwich the sides together in a sandwich shape. Furthermore, the side (GG) (186) of the second brace (34) is abutted so as to contact the tip where the side (P) (115) and the side (O) (114) of the two brace fixing upper plates (31) formed in the same shape intersect, and the overlap width (L) (141) of the overlapped side (GG) (186) is formed to a dimension of 69 mm in order to overlap and weld the sides (CC) (182) so as to sandwich the sides together in a sandwich shape in a sandwich shape. Similarly, the overlap width (K) (140) of the side (FF) (185) of the overlapping portion of the second brace (34) is formed to a dimension of 12 mm in order to sandwich and weld the ends of the third brace (35) and the fourth brace (36) together in a sandwich shape at a position a quarter of the way from the lower end on the center line of the plate mounting surface (B) (40) of the second steel column (12). In order to sandwich and weld the ends of the third brace (35) and the fourth brace (36), the side (Q) (116) of the brace fixing lower plate (32) formed of a rectangular plate with a thickness of 6 mm has a dimension of 70 mm and a side (T The dimension of the steel column mounting portion (117) is 230 mm, the dimension of the side (S) (118) is 70 mm, the dimension of the steel column mounting portion (117) is 230 mm, the side (JJ) (189) of the third brace (35) is abutted so as to be in contact with the tip where the side (Q) (116) and the side (T) (119) intersect, and the overlap width (M) (142) of the overlapped side (JJ) (189) is formed to be 75 mm in order to overlap and weld the brace together in a sandwich shape, and similarly, the dimension of the overlap width (N) (143) of the side (KK) (190) of the third brace (35) is 13 The plate mounting surface (A) (144) of the first steel column (11) is then fitted to the plate mounting surface (A) (144) of the first steel column (11). The plate mounting surface (A) (144) of the first steel column (11) is then fitted to the plate mounting surface (B) (144) of the second steel column (11). The plate mounting surface (B) (144) of the second ...). The plate mounting surface (B) (144) of the second steel column (11) is then fitted to the plate mounting surface (B) (144). The plate mounting surface (B) (144) of the second steel column (11) is then fitted to the plate mounting surface (B) (144). The plate mounting surface (B) (144) of the second steel column (11) is then fitted to the plate mounting surface (B) (144). The brace fixing upper end plate (28) , upper and lower central plates (29) for brace fixing, and a lower end plate (30) for brace fixing are welded to the plate mounting surface (B) (40) of the second steel column (12) located opposite each other, and the ends of four first braces (33), second brace (34) , third brace (35), and fourth brace (36) formed from square rectangular steel pipes with one side of 80 mm and a thickness of 2.3 mm are welded in an M-shape to the brace fixing upper end plate (28), upper and lower central plates (29) for brace fixing, and a lower end plate (30) for brace fixing which are welded to the plate mounting surface (B) (40) of the second steel column (12) located opposite each other.

According to the invention described in claim 1, an earthquake-resistant frame for earthquake-resistance reinforcement of a steel frame building comprises a first steel column (11) and a second steel column (12) each having two identical square steel pipes with sides of 100 mm, a wall thickness of 4.5 mm and a length of 2257 mm, arranged in parallel at an interval of 700 mm, an upper end plate (51 ) made of a square flat steel plate with sides of 100 mm and a thickness of 9 mm and having four bolt holes (60) formed at the four corners thereof to be welded to the steel column upper end (A) (70) of the first steel column (11), and further comprising four bolt holes (60) formed in the upper end plate (51). and a lower end plate (48) having four bolt holes (81) formed at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm for welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48). Four beam fixing nuts (79) for welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48) and a lower end plate (48) having a length of 100 mm and a thickness of 9 mm for welding to the steel column upper end (B) (78) of the second steel column (12) . a beam fixing plate (A) (38) having four bolt holes (61) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width and 9 mm in thickness; a beam fixing plate (B) (42) having four bolt holes (62) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width and 9 mm in thickness for welding to the lower end (B) (88) of the second steel column (12); and a beam fixing plate (B) (42) having four bolt holes (62) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width and 9 mm in thickness for welding to the lower end (B) (88) of the second steel column (12). The trapezoidal brace fixing upper end plate (28) is formed with a side (A) (100) dimension of 86 mm, a side (B) (101) dimension of 90 mm, an angle (A) where the side (A) (100) and the side (B) (101) intersect at 239.8 degrees, a side (C) (102) dimension of 70 mm, an angle where the side (B) (101) and the side (C) (102) intersect at 90 degrees, a steel column mounting portion (103) dimension of 140 mm, an angle where the steel column mounting portion (103) and the side (C) (102) intersect at 90 degrees, and an angle (B) where the steel column mounting portion (103) and the side (A) (100) intersect at 300.2 degrees. Two brace fixing plates of the same shape are formed. The overlap width (A) (130) of the side (BB) (181) of the overlapping portion of the first brace (33) is formed to be 12 mm in order to abut against the side (A) (100) of the upper end plate (28) in a sandwich-like manner and welded to the side. Similarly, the overlap width (B) (131) of the side (CC) (182) of the overlapping portion of the first brace (33) is formed to be 55 mm in order to be sandwiched and welded to the side. Furthermore, the ends of the second brace (34) and the third brace (35) are overlapped and welded to be sandwiched in the vertical center on the center line of the plate mounting surface (A) (41). Therefore, the upper and lower central plates (29) for fixing the braces, which are formed from a rectangular plate with a thickness of 6 mm, have a side (E) (104) dimension of 70 mm, a side (F) (105) dimension of 230 mm, a side (G) (106) dimension of 70 mm, and a dimension of the steel column mounting portion (107) dimension of 230 mm. The steel column mounting portion (107) is abutted against the upper and lower central portions of the plate mounting surface (A) (41) and welded to be joined. Furthermore, the side (FF) (185) of the second brace (34) is abutted against the tip of the upper and lower central plates (29) for fixing the braces where the side (E) (104) and side (F) (105) intersect, forming a sandwich. The overlap width (C) (132) of the overlapping portion, which is sandwiched and welded in a sandwich shape, is formed to have a dimension of 74 mm, and similarly, the overlap width (D) (133) of the side (GG) (186) of the overlapping portion, which is sandwiched and welded in a sandwich shape, is formed to have a dimension of 13 mm. Furthermore, the side (KK) (190) of the third brace (35) is abutted so as to contact the tip end where the side (F) (105) and the side (G) (106) of the two upper and lower central plates (29) for fixing the brace, which are formed to have the same shape, intersect, and the overlap width (F) (135) of the sandwiched and welded is formed to have a dimension of 75 mm. In order to sandwich and weld the end of the fourth brace (36) in a sandwich shape, the overlap width (E) (134) of the side (JJ) (189) of the overlapping portion is formed to a dimension of 13 mm, and further, in order to overlap and weld the end of the fourth brace (36) to the lower end on the center line of the plate mounting surface (A) (41) so as to sandwich the end, the tip where the side (K) (110) and the steel frame column mounting portion (111) intersect is abutted against the lower end of the plate mounting surface (A) (41), and the steel frame mounting portion (111) is welded to the plate mounting surface (A) (41). The dimension of the side (I) (108) of the lower end plate for fixing the brace (30) thus constructed is 70 mm, The dimension of (J) (109) is 90 mm, the angle at which side (I) (108) and side (J) (109) intersect is 90 degrees, the dimension of side (K) (110) is 86 mm, the angle (C) at which side (K) (110) and side (J) (109) intersect is 234.5 degrees, the angle (D) at which the steel column mounting part (111) and side (K) (110) intersect is 305.5 degrees, the dimension of the steel column mounting part (111) is 140 mm, and the dimension of the overlap width (G) (136) of the side (NN) (193) of the part sandwiched between the two brace fixing lower end plates (30) is 55 mm, and similarly, the overlap width (H) (137) is 55 mm. The brace fixing lower plate (30) is formed with an overlap width (H) (137) of 12 mm, and the second brace (33) is formed with a rectangular plate (40) with a thickness of 6 mm, and the brace fixing lower plate (30) is formed with a width (H) (137) of 12 mm, and the second brace (33) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (3 ...4) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (34) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (34) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (36) is formed with a width (H) (137) of 12 mm, and the second brace (36) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (36) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (36) is formed with a rectangular plate (40) with a thickness of 6 mm, and the second brace (36) is formed with a rectangular plate (4 The side (M) (112) of the upper plate (31) for fixing the brace has a dimension of 70 mm, the side (P) (115) has a dimension of 230 mm, the side (O) (114) has a dimension of 70 mm, and the steel column mounting portion (113) has a dimension of 230 mm. The side (BB) (181) of the first brace (33) is abutted so as to be in contact with the tip where the side (M) (112) and the side (P) (115) intersect, and the overlap width (I) (138) of the overlapped side (BB) (181) is formed to have a dimension of 69 mm in order to sandwich the first brace (33) in a sandwich-like manner and weld the overlapped side (BB) (181). The overlap width (J) (139) of the side (CC) (182) of the second brace (33) is formed to a dimension of 12 mm, and the side (GG) (186) of the second brace (34) is abutted so as to contact the tip of the intersection of the side (P) (115) and the side (O) (114) of the two brace fixing upper plates (31) formed in the same shape, and the overlap width (L) (141) of the overlapped side (GG) (186) is formed to a dimension of 75 mm in order to sandwich and weld the overlapped side (GG) (186) in a sandwich shape. Similarly, the overlap width (K) (140) of the side (FF) (185) of the overlapped portion of the second brace (34) is formed to a dimension of 75 mm in order to sandwich and weld the overlapped side (FF) (185) in a sandwich shape. The dimension of the brace fixing lower plate (32) formed of a rectangular plate having a thickness of 6 mm is 70 mm for the dimension of side (Q) (116), 230 mm for the dimension of side (T) (119), 70 mm for the dimension of side (S) (118), and 230 mm for the dimension of the steel column mounting portion (117). The dimension of the side (Q) (116) and the side (T) (119) are 230 mm, and the dimension of the steel column mounting portion (117) is 230 mm, and the intersection of the side (Q) (116) and the side (T) (119) is 230 mm. The side (JJ) (189) of the third brace (35) is abutted so as to contact the tip end where the side (JJ) (189) overlaps the side (JJ) (189) and is welded together in a sandwich shape, so the overlap width (M) (142) of the overlapped side (JJ) (189) is formed to be 75 mm. Similarly, the overlap width (N) (143) of the side (KK) (190) of the third brace (35) is formed to be 13 mm in order to be welded together in a sandwich shape, and the side (T) (119) and the side (S) (118) of the fourth brace (36) are abutted so as to contact the tip end where the side (T) (119) and the side (S) (118) of the two brace fixing lower plates (32) formed in the same shape intersect. The overlapping width (P) (145) of the overlapping side (OO) (194) is formed to be 69 mm in order to sandwich and weld the overlapping side (OO) (194) in a sandwich shape, and similarly, the overlapping width (O) (144) of the overlapping side (NN) (193) is formed to be 12 mm in order to sandwich and weld the overlapping side (NN) (193) in a sandwich shape. The brace fixing upper end plate (28), the brace fixing upper and lower center plates (29), and the brace fixing lower end plate (30) welded to the plate mounting surface (A) (41) of the first steel column (11) and the brace fixing upper end plate (28), the brace fixing upper and lower center plates (29) , and the brace fixing lower end plate (30) of the second steel column (12) located opposite each other are formed to be 12 mm in order to sandwich and weld the overlapping width (P) (145) of the overlapping side (OO) (194) in a sandwich shape ...NN ) (193) in a sandwich shape and weld the overlapping width (O) (144) of the The ends of the first brace (33), second brace ( 34), third brace (35) , and fourth brace (36) , which are made of square steel pipes with sides of 80 mm and a thickness of 2.3 mm, are welded into an M shape to the brace fixing upper plate (31) and brace fixing lower plate (32) which are welded to the plate mounting surface (B) (40). This makes it possible to form the earthquake-resistant frame with a narrower width than the X-shaped and K-shaped earthquake-resistant frames which have been commonly used in the past, and therefore makes it possible to increase the width of openings such as windows, entrances, and the like in the building.

Hereinafter, an embodiment of the present invention will be described.

1 to 8 show an embodiment of the present invention.

Fig. 1 shows a steel frame structure 1 for constructing a steel frame building. A plurality of anchor bolts 13 embedded in predetermined positions of foundation concrete 14, an earthquake-resistant M-shaped frame 5 for the first floor of the steel frame structure fixed to the anchor bolts 13, an earthquake-resistant M-shaped frame 4 for the upper floor of the steel frame structure on the second floor, an earthquake-resistant M-shaped frame 3 for the upper floor of the steel frame structure on the third floor, an earthquake-resistant M-shaped frame 2 for the top floor of the steel frame structure on the fourth floor, ALC wall panels 10 constituting the exterior walls, structural plywood 16 constituting the gable roof, asphalt roofing 17 for waterproofing the roof, and decorative slates 18 are shown in plan view.

Furthermore, the earthquake-resistant M-shaped frame 15 for the upper floors of the steel structure on the second floor shown in Figure 1 is constructed with the same shape as the earthquake-resistant M-shaped frame 4 for the upper floors of the steel structure, but flipped left and right, and is shown installed on the opposite side opposite to the earthquake-resistant M-shaped frame 4 for the upper floors of the steel structure on the second floor.

2 is a perspective view of the earthquake-resistant M-shaped frame 4 for upper floors of a steel frame structure, and the girder (A) 6, girder (B) 7, girder (C) 8, and girder (D) 9 described in Fig. 1. The earthquake-resistant M-shaped frame 4 for upper floors of a steel frame structure is composed of a first steel column 11 and a second steel column 12, each of which is made of two square steel pipes with sides of 100 mm and a thickness of 4.5 mm, arranged in parallel at intervals of 700 mm, two upper end plates 28 for fixing braces, each of which is made of a trapezoidal flat steel plate of the same shape and welded to the upper end of the plate mounting surface (A) 41 on the center line of the first steel column 11, and two upper end plates 28 for fixing braces, each of which is made of a trapezoidal flat steel plate of the same shape and welded to the upper end of the plate mounting surface (A) 41 on the center line of the plate mounting surface (A) 41. The brace fixing upper and lower central plates 29 are formed of flat steel plates having the same shape and are welded to the lower end of the plate mounting surface (A) 41, and the brace fixing lower end plates 30 are formed of flat steel plates having the same shape and are welded to the lower end of the plate mounting surface (A) 41. The brace fixing upper end plate 28, the brace fixing upper and lower central plates 29, and the brace fixing lower end plate 30 are formed of flat steel plates having the same shape and are welded to the lower end of the plate mounting surface (A) 41. The brace fixing upper end plate 28, the brace fixing upper and lower central plates 29, and the brace fixing lower end plate 30 are formed of flat steel plates having the same shape and are welded to the lower end of the plate mounting surface (A) 41. The ends of four braces, a first brace 33, a second brace 34, a third brace 35, and a fourth brace 36, which are made of square steel pipes with a side length of 80 mm and a thickness of 2.3 mm, are welded in an M shape to the brace fixing upper plate 31 and the brace fixing lower plate 32, which are welded to the plate mounting surface (B) 40 of the second steel column 12 located opposite to the brace fixing upper plate 31 and the brace fixing lower plate 32. An upper end plate 51 made of a square flat steel plate measuring 100 mm in length, 270 mm in width and 9 mm in thickness is welded to the upper end of the second steel column 12, and a beam fixing plate (A) 38 made of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width and 9 mm in thickness is welded to the upper end of the second steel column 12. A beam fixing plate (A) 38 having a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm and a web thickness of 5.5 mm is welded to the upper surface of the upper end plate 51 and the beam fixing plate (A) 38 thus constructed. The end side of the girder (A) 6 formed from the H-shaped steel and the end of the girder (B) 7 formed from the H-shaped steel of the same shape as the girder (A) 6 are fixed at right angles in an L-shape with gusset plates 25, bolts 26, and nuts (not shown). The girder lower flange (A) 46 of the girder (A) 6 and the girder lower flange (B) 47 of the girder (B) 7 are placed on the girder, and the girder (A) 6, the girder (B) 7, and the first steel column 11 and the second steel column 12 are fixed with bolts 27 and 37. Furthermore, a lower end plate 48 formed from a square flat steel plate measuring approximately 100 mm in length, 100 mm in width and 9 mm in thickness is welded to the lower end of the first steel column 11, and further a beam fixing plate (B) 42 formed from a rectangular flat steel plate measuring approximately 100 mm in length, 270 mm in width and 9 mm in thickness is welded to the lower end of the second steel column 12. A beam fixing plate (B) 42 having a height dimension of 200 mm, a side dimension of 100 mm and a width of 150 mm is welded to the lower surface of the lower end plate 48 and the beam fixing plate (B) 42 thus constructed. The side end of a girder (C) 8 formed from an H-shaped steel with dimensions of 100 mm, a flange thickness of 8 mm, and a web thickness of 5.5 mm, and the end of a girder (D) 9 formed from an H-shaped steel of the same shape as the girder (C) 8 are fixed at right angles in an L-shape with gusset plates 44, bolts 45, and nuts (not shown), and the upper girder flange (A) 49 of the girder (C) 8 and the upper girder flange (B) 50 of the girder (D) 9 are fixed with bolts 43 and bolts 83 (shown in Figure 5).

3 is a perspective view showing a state in which the perspective view described in FIG. 2 is seen from a direction substantially opposite to the perspective view. The perspective view shows a state in which the brace fixing upper end plate 28 formed of two identical trapezoidal flat steel plates is welded to the upper end on the center line of the plate mounting surface (A) 41 of the first steel column 11, the brace fixing upper and lower center plates 29 formed of two rectangular flat steel plates are welded to the upper and lower center parts on the center line of the plate mounting surface (A) 41, and the brace fixing lower end plate 30 formed of the same trapezoidal flat steel plate is welded to the lower end on the center line of the plate mounting surface (A) 41.

Fig. 4 is a perspective view showing the state in which the girder (A) 6 and girder (B) 7 attached with bolts 27 and 37 to the top of the earthquake-resistant M-shaped steel frame 4 for the upper floors described in Fig. 2, and the girder (C) 8 and girder (D) 9 attached with bolts 43 and 83 (shown in Fig. 5) to the bottom of the earthquake-resistant M-shaped steel frame 4 for the upper floors are removed. By assembling the earthquake-resistant M-shaped steel frame 4 for the upper floors configured in this way using jigs in a factory, it has become possible to build a steel structure with improved assembly precision.

Fig. 5 shows an exploded view of the earthquake-resistant M-shaped frame 4 for the upper floor of the steel frame structure described in Fig. 2. The frame 4 comprises an upper end plate 51 having four bolt holes 60 formed at approximately four corners of a square flat steel plate having a side length of 100 mm and a thickness of 9 mm, for welding to the steel column upper end (A) 70 of the first steel column 11 formed from a square rectangular steel pipe having a side length of 100 mm, a thickness of 4.5 mm and a length of 2257 mm, four beam fixing nuts 72 for welding to the steel column mounting surface (A) 69 of the four bolt holes 60 formed in the upper end plate 51, and a base having the same shape for welding to the upper end on the center line of the plate mounting surface (A) 41 of the first steel column 11. The brace fixing upper end plates 28 are formed from flat steel plates of the same shape, and two upper and lower central plates 29 are formed from flat steel plates of the same shape, and are welded to the upper and lower central parts on the center line of the plate mounting surface (A) 41 of the first steel column 11. The brace fixing lower end plates 30 are formed from flat steel plates of the same shape, and are welded to the lower end parts on the center line of the plate mounting surface (A) 41 of the first steel column 11. The brace fixing lower end plates 30 are formed from flat steel plates of the same shape, and are welded to the steel column lower end (A) 84 of the first steel column 11. a lower end plate 48 having four bolt holes 81 formed at approximately the four corners of a square flat steel plate of 9 mm; four beam fixing nuts 79 for welding to the steel column mounting surface (C) 80 of the four bolt holes 81 formed in the lower end plate 48; a beam fixing plate (A) 38 having four bolt holes 61 formed at approximately the four corners of a rectangular flat steel plate of about 100 mm in length, about 270 mm in width, and 9 mm in thickness for welding to the steel column upper end (B) 78 of the second steel column 12; 1 shows two upper brace fixing plates 31 made of flat steel plates having the same rectangular shape to be welded to position 1, two lower brace fixing plates 32 made of flat steel plates having the same rectangular shape to be welded to a quarter position from the lower end on the center line of the plate mounting surface (B) 40 of the second steel column 12, and a beam fixing plate (B) 42 made of a rectangular flat steel plate having a length of approximately 100 mm, a width of approximately 270 mm and a thickness of 9 mm, with four bolt holes 62 formed at approximately the four corners to be welded to the steel column lower end portion (B) 88 of the second steel column 12.

5 further shows four bolt holes 66 formed at positions of the girder lower flange (A) 46 facing the four bolt holes 60 formed in the upper end plate 51 in order to fix the first steel column 11, to which the upper end plate 51 is welded, to the girder lower flange (A) 46 of the girder (A) 6 formed from an H-shaped steel, and also shows bolts 66 and beam fixing nuts 72 for attaching the girder lower flange (A) 46 of the girder (A) 6 to the first steel column 11. Similarly, four bolt holes 75 are formed at positions of the girder lower flange (B) 47 of the girder (B) 7 facing the four bolt holes 61 formed in the beam fixing plate (A) 38 of the second steel column 12, and also shows bolts 37 and nuts 76 for attaching the girder (B) 7 to the second steel column 12. Furthermore, as explained in FIG. 2 , in order to fix the first steel column 11 to which the lower end plate 48 is welded, and the second steel column 12 to which the beam fixing plate (B) 42 is welded, to the upper girder flange (A) 49 of the girder (C) 8 formed from H-shaped steel and the upper girder flange (B) 50 of the girder (D) 9, four bolt holes 82 are formed at positions of the upper girder flange (A) 49 facing the four bolt holes 81 formed in the lower end plate 48, and bolts 83 and beam fixing nuts 79 are also shown for fixing the girder (C) 8 to the lower end plate 48 welded to the steel column lower end (A) 84 of the first steel column 11. Similarly, four bolt holes 87 are formed at positions on the upper flange (B) 50 of the main girder that correspond to the four bolt holes 62 formed in the beam fixing plate (B) 42, and bolts 43 and nuts 91 are shown for fixing the main girder (D) 9 to the beam fixing plate (B) 42 welded to the lower end (B) 88 of the steel column of the second steel column 12.

6 shows a front view of the earthquake-resistant M-shaped frame 4 for the upper floors of the steel frame structure described in FIG. 2, and also shows enlarged views of the upper end plate 28 for brace fixing, the upper and lower central plates 29 for brace fixing, and the lower end plate 30 for brace fixing, which are welded to the plate mounting surface (A) 41 of the first steel column 11 in FIGS. 6a to 6e, as well as the upper plate 31 for brace fixing and the lower plate 32 for brace fixing, which are welded to the plate mounting surface (B) 40 of the second steel column 12.

6a shows the first steel column 11 in dotted lines and the brace fixing upper end plate 28 welded to the plate mounting surface (A) 41 at the upper end of the first steel column 11 in solid lines. The brace fixing upper end plate 28 is two identical trapezoidal plates with a thickness of 6 mm to sandwich and fix the end of the first brace 33 formed from a square steel pipe with a side length of 80 mm and a thickness of 2.3 mm to the first steel column 11. The plate is disposed so that the tip where the side (A) 100 and the steel column mounting part 103 intersect is in contact with the upper end of the plate mounting surface (A) 41, and the steel mounting part 103 is welded to the plate mounting surface (A) 41. The dimension of side (A) 100 of the brace fixing upper end plate 28 is approximately 86 mm, the dimension of side (B) 101 is approximately 90 mm, and the angle A at which side (A) 100 and side (B) 101 intersect is approximately 239.8 degrees. The dimension of side (C) 102 is approximately 70 mm, the angle at which side (B) 101 and side (C) 102 intersect is 90 degrees, the dimension of the steel column mounting part 103 is approximately 140 mm, the angle at which the steel column mounting part 103 intersects with side (C) 102 is 90 degrees, and the angle B at which the steel column mounting part 103 intersects with side (A) 100 is approximately 300.2 degrees.

6b shows the first steel column 11 in dotted lines and the brace fixing upper and lower central plates 29 welded to the plate mounting surface (A) 41 at the upper and lower central parts of the first steel column 11 in solid lines. The brace fixing upper and lower central plates 29 are two rectangular plates with a thickness of 6 mm and the same shape to sandwich and fix the ends of the second brace 34 and the third brace 35 formed from square steel pipes with a side length of 80 mm and a thickness of 2.3 mm to the first steel column 11. The dimensions of the side (E) 104 are approximately 70 mm, the dimension of the side (F) 105 are approximately 230 mm, the dimension of the side (G) 106 are approximately 70 mm, and the dimension of the steel column mounting part 107 is approximately 230 mm, and the state shown is that the upper and lower central parts of the steel column mounting part 107 are abutted against the upper and lower central parts of the plate mounting surface (A) 41 and welded to the plate mounting surface (A) 41.

6c shows the first steel column 11 in dotted lines and the brace fixing lower end plate 30 welded to the plate mounting surface (A) 41 at the lower end of the first steel column 11 in solid lines. The brace fixing lower end plate 30 is a pair of identical trapezoidal plates with a thickness of 6 mm for sandwiching the end of the fourth brace 36 formed from a square steel pipe with a side length of 80 mm and a thickness of 2.3 mm to the first steel column 11. The plate is disposed so that the tip where the side (K) 110 and the steel column mounting portion 111 intersect is in contact with the lower end of the plate mounting surface (A) 41, and the steel mounting portion 111 is welded to the plate mounting surface (A) 41. The dimension of side (I) 108 of the brace fixing lower end plate 30 is approximately 70 mm, the dimension of side (J) 109 is approximately 90 mm, the angle at which side (I) 108 and side (J) 109 intersect is 90 degrees, the dimension of side (K) 110 is approximately 86 mm, the angle at which side (K) 110 and side (J) 109 intersect is approximately 234.5 degrees, the angle D at which steel column mounting portion 111 and side (K) 110 intersect is approximately 305.5 degrees, and the dimension of steel column mounting portion 111 is approximately 140 mm.

6d shows the second steel column 12 in dotted lines and the brace fixing upper plate 31 welded to the plate mounting surface (B) 40 at a quarter from the top end of the second steel column 12 in solid lines. The brace fixing upper plate 31 is two rectangular plates with a thickness of 6 mm and the same shape to sandwich the ends of the first brace 33 and the second brace 34 formed from square steel pipes with a side length of 80 mm and a thickness of 2.3 mm and fix them to the second steel column 12. The dimensions of the side (M) 112 are about 70 mm, the dimensions of the side (P) 115 are about 230 mm, the dimensions of the side (O) 114 are about 70 mm, and the dimensions of the steel column mounting part 113 are about 230 mm. The state shown is that the upper and lower central parts of the steel column mounting part 113 are abutted and welded to the plate mounting surface (B) 40 at a quarter from the top end.

6e shows the second steel column 12 in dotted lines and the brace fixing lower plate 32 welded to the plate mounting surface (B) 40 at a quarter from the lower end of the second steel column 12 in solid lines. The brace fixing lower plate 32 is two rectangular plates with a thickness of 6 mm and the same shape to sandwich the ends of the third brace 35 and the fourth brace 36 formed from square steel pipes with a side length of 80 mm and a thickness of 2.3 mm and fix them to the second steel column 12, with the side (Q) 116 measuring approximately 70 mm, the side (T) 119 measuring approximately 230 mm, the side (S) 118 measuring approximately 70 mm, and the steel column mounting portion 117 measuring approximately 230 mm, and shows a state in which the upper and lower central portions of the steel column mounting portion 117 are abutted against the plate mounting surface (B) 40 at a quarter position from the lower end and welded.

7 shows a front view of the earthquake-resistant M-shaped frame 4 for the upper floors of the steel frame structure described in FIG. 4, and also shows in FIGS. 7a to 7e enlarged views of the first brace 33, second brace 34, third brace 35, and fourth brace 36 welded to the brace fixing upper end plate 28, upper and lower central plates 29 for brace fixing, and lower end plate 30 for brace fixing, which are welded to the plate mounting surface (A) 41 of the first steel column 11, as well as the first brace 33, second brace 34, third brace 35, and fourth brace 36 welded to the brace fixing upper plate 31 and brace fixing lower plate 32 welded to the plate mounting surface (B) 40 of the second steel column 12.

7a shows the state in which the end of the first brace 33 is sandwiched between two brace fixing upper end plates 28 formed in the same shape, with dotted lines. The overlap width (A) 130 is the overlapping portion for abutting the side (BB) 181 (shown in FIG. 8) of the first brace 33 with the side (A) 100 (shown in FIG. 6a) of the brace fixing upper end 28 so as to overlap and weld the two plates together, and the dimension of the overlap width (A) 130 is about 12 mm. Similarly, the overlap width (B) 131 is the overlapping portion for sandwiching the first brace 33 between the two brace fixing upper end plates 28 and welding the two plates together, and the dimension of the overlap width (B) 131 shown by dotted lines is about 55 mm.

Figure 7b shows by dotted lines the state in which the ends of the second brace 34 and the third brace 35 are sandwiched and fixed between two upper and lower central plates 29 for fixing the brace, which are formed in the same shape. The overlap width (C) 132 is the overlapping portion where the edge (FF) 185 (shown in Figure 8) of the second brace 34 is arranged to contact the tip where the edge (E) 104 and the edge (F) 105 described in Figure 6b intersect, and the two upper and lower central plates 29 for fixing the brace, which are formed in the same shape, are sandwiched and welded together, and the dimension of the overlap width (C) 132 shown by the dotted line is approximately 74 mm. Similarly, overlap width (D) 133 is the overlapping portion for sandwiching and welding the side (GG) 186 (shown in FIG. 8) of the second brace 34 between the two brace fixing upper and lower central plates 29, and the dimension of overlap width (D) 133 shown by dotted lines is approximately 13 mm. Furthermore, overlap width (E) 134 is the overlapping portion for sandwiching and welding the side (JJ) 189 (shown in FIG. 8) of the third brace 35 between the two brace fixing upper and lower central plates 29, and the dimension of overlap width (E) 134 shown by dotted lines is approximately 13 mm. Similarly, overlap width (F) 135 is the overlapping portion which is positioned so that side (KK) 190 (shown in FIG. 8) of the third brace 35 contacts the tip where side (F) 105 and side (G) 106 described in FIG. 6b intersect, and is sandwiched between two upper and lower central plates 29 for fixing the brace which are formed to the same shape, and welded together, and the dimension of overlap width (F) 135 shown by the dotted line is approximately 75 mm.

7c shows by dotted lines the state in which the end of the fourth brace 36 is sandwiched between two brace fixing lower end plates 30 formed in the same shape. The overlapping portion is for sandwiching the end of the fourth brace 36 between the two brace fixing lower end plates 30 and welding it together, and the overlapping width (G) 136 is for sandwiching the side (NN) 193 (shown in FIG. 8) of the fourth brace 36 between the two brace fixing lower end plates 30 and welding it together, and the dimension of the overlapping width (G) 136 shown by dotted lines is approximately 55 mm. Similarly, overlap width (H) 137 is the overlapping portion where side (OO) 194 (shown in FIG. 8) of the fourth brace 36 is abutted so as to overlap with side (K) 110 (shown in FIG. 6c) of the brace fixing lower end plate 30 for welding and joining, and the dimension of overlap width (H) 137 is approximately 12 mm.

FIG. 7d shows the state in which the ends of the first brace 33 and the second brace 34 are sandwiched between two brace fixing upper plates 31 formed in the same shape, with dotted lines. The overlap width (I) 138 is a portion overlapped in order to sandwich and weld the edge (BB) 181 (shown in FIG. 8) of the first brace 33 between the tip of the edge (M) 112 and edge (P) 115 described in FIG. 6d and sandwich the edge (BB) 181 (shown in FIG. 8) between the two brace fixing upper plates 31 formed in the same shape, and the dimension of the overlap width (I) 138 shown by the dotted line is about 69 mm. Similarly, the overlap width (J) 139 is a portion overlapped in order to sandwich and weld the edge (CC) 182 (shown in FIG. 8) of the first brace 33 between the two brace fixing upper plates 31, and the dimension of the overlap width (J) 139 shown by the dotted line is about 12 mm. Furthermore, the overlap width (K) 140 is an overlapping portion in order to sandwich the side (FF) 185 (shown in FIG. 8) of the second brace 34 between the two brace fixing upper plates 31 and weld it, and the dimension of the overlap width (K) 140 shown by the dotted line is about 13 mm. Similarly, the overlap width (L) 141 is an overlapping portion in order to sandwich the side (GG) 186 (shown in FIG. 8) of the second brace 34 between the ends of the sides (P) 115 and (O) 114 described in FIG. 6d and weld it between the two brace fixing upper plates 31 formed in the same shape, and the dimension of the overlap width (L) 141 shown by the dotted line is about 75 mm.

Figure 7e shows by dotted lines the state in which the ends of the third brace 35 and the fourth brace 36 are sandwiched between two brace fixing lower plates 32 formed in the same shape. The overlap width (M) 142 is the overlapping portion where the side (JJ) 189 (shown in Figure 8) of the third brace 35 is arranged to contact the tip end where the side (Q) 116 and the side (T) 119 described in Figure 6e intersect, and is sandwiched between the two brace fixing lower plates 32 formed in the same shape and welded to join, and the dimension of the overlap width (M) 142 shown by dotted lines is approximately 75 mm. Similarly, overlap width (N) 143 is the overlapping portion for sandwiching and welding the side (KK) 190 (shown in FIG. 8) of the third brace 35 between the two brace fixing lower plates 32, and the dimension of overlap width (N) 143 shown by the dotted line is approximately 13 mm. Furthermore, overlap width (O) 144 is the overlapping portion for sandwiching and welding the side (NN) 193 (shown in FIG. 8) of the fourth brace 36 between the two brace fixing lower plates 32, and the dimension of overlap width (O) 144 shown by the dotted line is approximately 12 mm. Similarly, overlap width (P) 145 is the overlapping portion that is positioned so as to contact side (OO) 194 (shown in FIG. 8) of fourth brace 36 with the tip where side (S) 118 and side (T) 119 described in FIG. 6e intersect, and is sandwiched between two brace fixing lower plates 32 that are formed in the same shape and welded together, and the dimension of overlap width (P) 145 shown by a dotted line is approximately 69 mm.

Furthermore, welds (A) 146, (B) 148, (C) 156, (D) 150, (E) 152, (F) 158, (G) 160, and (H) 154 in Figure 7 indicate the positions at which the first brace 33, the second brace 34, the third brace 35, and the fourth brace 36 are welded to the two brace fixing upper end plates 28, the upper and lower central plates 29 for brace fixing, the lower end plate 30 for brace fixing, the upper plate 31 for brace fixing, and the lower plate 32 for brace fixing.

8 is a front view showing the disassembled state of the first steel column 11, the second steel column 12, the brace fixing upper end plate 28, the brace fixing upper and lower central plate 29, the brace fixing lower end plate 30, the brace fixing upper plate 31, the brace fixing lower plate 32, the first brace 33, the second brace 34, the third brace 35, and the fourth brace 36 of the earthquake-resistant M-shaped frame 4 for the upper floor of the steel frame structure explained in FIG 7. The first brace 33 is formed from a square steel pipe with one side of 80 mm, a thickness of 2.3 mm, and a length of about 769 mm, and both ends are welded to the brace fixing upper end plate 28 and the brace fixing upper plate 31 at an angle of about 35.5 degrees with respect to the horizontal direction, as shown by angle E. Similarly, the second brace 34 is formed from a square steel pipe with a side length of 80 mm, a thickness of 2.3 mm, and a length of approximately 797 mm, and both ends are welded to the brace fixing upper plate 31 and the brace fixing upper and lower center plates 29 at an angle of approximately 37.9 degrees with respect to the horizontal direction as shown by angle F. Similarly, the third brace 35 is formed from a square steel pipe with a side length of 80 mm, a thickness of 2.3 mm, and a length of approximately 797 mm, and both ends are welded to the brace fixing upper and lower center plates 29 and the brace fixing lower plate 32 at an angle of approximately 37.9 degrees with respect to the horizontal direction as shown by angle G. Similarly, the fourth brace 36 is formed from a square steel pipe with a side length of 80 mm, a wall thickness of 2.3 mm, and a length of approximately 769 mm, and both ends are welded to the brace fixing lower plate 32 and the brace fixing lower end plate 30 at an angle of approximately 35.5 degrees to the horizontal, as shown by angle H.

The earthquake-resistant M-shaped frame for upper floors of a steel structure according to the present invention has been explained in detail above based on the embodiment, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention, and of course still fall within the technical scope of the present invention.

1 is a front view of a steel frame structure for constructing a steel frame building according to an embodiment of the present invention; 2 is a perspective view showing an earthquake-resistant M-shaped frame for an upper floor of a steel frame structure according to the embodiment, which is installed on the second floor of the steel frame structure shown in FIG. 1 . 3 is a perspective view showing the earthquake-resistant M-shaped frame for an upper floor of a steel frame structure shown in FIG. 2 according to the embodiment, viewed from the opposite direction. 3 is a perspective view showing the earthquake-resistant M-shaped frame for an upper floor of a steel frame structure shown in FIG. 2 with the upper and lower girders removed, according to the embodiment. FIG. 3 is an exploded view of the earthquake-resistant M-shaped frame for the upper floors of a steel frame structure shown in FIG. 2 according to the embodiment. 3 is a front view of the earthquake-resistant M-shaped frame for upper floors of a steel frame structure shown in FIG. 2 according to the embodiment. FIG. 7 is a front view showing a state in which a brace is welded to the plate of the earthquake-resistant M-shaped frame for the upper floor of the steel frame structure shown in FIG. 6 according to the embodiment. 8 is an exploded view showing the plate and the brace of the earthquake-resistant M-shaped frame for the upper floor of the steel frame structure shown in FIG. 7 according to the embodiment.

A Angle B Angle C Angle D Angle E Angle F Angle G Angle H Angle 1 Steel structure 2 Steel structure earthquake-resistant M-shaped frame for top floor 3 Steel structure earthquake-resistant M-shaped frame for upper floors 4 Steel structure earthquake-resistant M-shaped frame for upper floors 5 Steel structure earthquake-resistant M-shaped frame for 1st floor 6 Main girder (A)
7 Large beam (B)
8 Large beam (C)
9 Large beam (D)
10 ALC wall panel 11 First steel column 12 Second steel column 13 Anchor bolt 14 Foundation concrete 15 Earthquake-resistant M-shaped frame for upper floors of steel structure 16 Structural plywood 17 Asphalt roofing 18 Decorative slate 19 First steel column 20 Second steel column 21 First steel column 22 Second steel column 23 First steel column 24 Second steel column 25 Gusset plate 26 Bolt 27 Bolt 28 Upper end plate for brace fixing 29 Upper and lower central plate for brace fixing 30 Lower end plate for brace fixing 31 Upper plate for brace fixing 32 Lower plate for brace fixing 33 First brace 34 Second brace 35 Third brace 36 Fourth brace 37 Bolt 38 Beam fixing plate (A)
40 Plate mounting surface (B)
41 Plate mounting surface (A)
42 Beam fixing plate (B)
43 Bolt 44 Gusset plate 45 Bolt 46 Beam lower flange (A)
47 Lower flange of girder (B)
48 Lower end plate 49 Upper flange of girder (A)
50 Upper flange of girder (B)
51 Upper end end plate 60 Bolt hole 61 Bolt hole 62 Bolt hole 66 Bolt hole 68 Beam mounting surface (A)
69 Steel column mounting surface (A)
70 Upper end of steel column (A)
72 Beam fixing nut 73 Beam mounting surface (B)
75 Bolt hole 76 Nut 77 Steel column mounting surface (B)
78 Steel column upper end (B)
79 Beam fixing nut 80 Steel column mounting surface (C)
81 Bolt hole 82 Bolt hole 83 Bolt 84 Steel column lower end (A)
85 Beam mounting surface (A)
87 Bolt hole 88 Steel column bottom end (B)
89 Steel column mounting surface (D)
90 Beam mounting surface (B)
91 Nut 100 Side (A)
101 Side (B)
102 Side (C)
103 Steel column attachment part 104 Side (E)
105 Side (F)
106 Side (G)
107 Steel column attachment part 108 Side (I)
109 Side (J)
110 Side (K)
111 Steel column mounting portion 112 Side (M)
113 Steel column mounting portion 114 Side (O)
115 Sides (P)
116 Side (Q)
117 Steel column attachment part 118 Side (S)
119 Side (T)
130 overlap width (A)
131 overlap width (B)
132 overlap width (C)
133 overlap width (D)
134 overlap width (E)
135 overlap width (F)
136 overlap width (G)
137 overlap width (H)
138 overlap width (I)
139 overlap width (J)
140 overlap width (K)
141 overlap width (L)
142 overlap width (m)
143 overlap width (N)
144 overlap width (O)
145 overlap width (P)
146 Welded section (A)
147 Intersection (A)
148 Welded section (B)
149 Intersection (B)
150 Welding section (D)
151 Intersection (D)
152 Welded section (E)
153 Intersection (E)
154 Welded part (H)
155 Intersection (H)
156 Welded section (C)
157 Intersection (C)
158 Welded part (F)
159 Intersection (F)
160 Welded section (G)
161 Intersection (G)
180 sides (AA)
181 Sides (BB)
182 sides (CC)
183 sides (DD)
184 sides (EE)
185 sides (FF)
186 sides (GG)
187 Sides (HH)
188 Sides (II)
189 Sides (JJ)
190 sides (KK)
191 sides (LL)
192 sides (MM)
193 sides (NN)
194 sides (OO)
195 sides (PP)

Claims (1)

In earthquake-resistant frames for strengthening the earthquake resistance of steel-framed buildings,
A first steel column (11) and a second steel column (12) are made of two identical square steel pipes, each having a side length of 100 mm, a wall thickness of 4.5 mm, and a length of 2257 mm, arranged in parallel at an interval of 700 mm;
an upper end plate (51) having four bolt holes (60) formed at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm for welding to the steel column upper end (A) (70) of the first steel column (11); four beam fixing nuts (72) for welding to the steel column mounting surface (A) (69) of the four bolt holes (60) formed in the upper end plate (51); a lower end plate (48) having four bolt holes (81) formed at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm for welding to the steel column lower end (A) (84) of the first steel column (11); and four beam fixing nuts (79) for welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48);
a beam fixing plate (A) (38 ) having four bolt holes ( 61) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width, and 9 mm in thickness, for welding to the steel column upper end (B) (78) of the second steel column (12); and a beam fixing plate (B) (42) having four bolt holes (62) formed at the four corners of a rectangular flat steel plate measuring 100 mm in length, 270 mm in width, and 9 mm in thickness, for welding to the steel column lower end (B) (88) of the second steel column (12);
The upper end plate (28) for fixing the brace is shaped like a trapezoid and has a thickness of 6 mm. The upper end plate (28) is formed so as to sandwich the end of the first brace (33) by welding to the upper end of the plate mounting surface (A) (41) on the center line of the first steel column (11). The side (A) (100) of the upper end plate (28) is 86 mm in dimension, the side (B) (101) is 90 mm in dimension, the angle (A) between the side (A) (100) and the side (B) (101) is 239.8 degrees, the side (C) (102) is 70 mm in dimension, and the side (B) (101) is 90 mm in dimension. The angle at which the steel column mounting portion (103) and side (C) (102) intersect is 90 degrees, the dimension of the steel column mounting portion (103) is 140 mm, the angle at which the steel column mounting portion (103) and side (C) (102) intersect is 90 degrees, and the angle (B) at which the steel column mounting portion (103) and side (A) (100) intersect is 300.2 degrees. In order to weld the overlapping portion by sandwiching it against the sides (A) (100) of the two identically shaped brace fixing upper end plates (28), the dimension of the overlap width (A) (130) of the side (BB) (181) of the first brace (33) is 12 mm. Similarly, the overlap width (B) (131) of the side (CC) (182) of the overlapping portion of the first brace (33) is formed to be 55 mm in order to sandwich and weld the ends of the second brace (34) and the third brace (35) in a sandwich-like manner at the upper and lower central parts on the center line of the plate mounting surface (A) (41), and the side (E) (104) of the upper and lower central plates (29) for fixing the braces formed from a rectangular plate with a thickness of 6 mm is 70 mm in order to sandwich and weld the ends of the second brace (34) and the third brace (35) in a sandwich-like manner at the upper and lower central parts on the center line of the plate mounting surface (A) (41). The dimension of the steel column mounting portion (107) is formed to be 230 mm, the dimension of the side (F) (105) is 230 mm, the dimension of the side (G) (106) is 70 mm, and the dimension of the steel column mounting portion (107) is formed to be 230 mm, and the steel column mounting portion (107) is abutted against the upper and lower central portions of the plate mounting surface (A) (41) and welded together. Furthermore, the side (FF) (185) of the second brace (34) is abutted against the tip portion where the side (E) (104) and the side (F) (105) of the upper and lower central plate (29) for fixing the brace intersect, and the plates are sandwiched together and overlapped by welding to form an overlap width (C) ( Similarly, the overlap width (D) (133) of the side (GG) (186) of the overlapping portion to be sandwiched and welded is formed to a dimension of 13 mm, and the side (KK) (190) of the third brace (35) is abutted so as to contact the tip where the side (F) (105) and the side (G) (106) of the two upper and lower central plates (29) for fixing the brace, which are formed to the same shape, intersect, and the dimension of the overlap width (F) (135) to be sandwiched and welded is set to 75 mm. Similarly, the overlap width (E) (134) of the overlapping portion of the side (JJ) (189) is formed to a dimension of 13 mm in order to sandwich and weld the end of the fourth brace (36) onto the lower end on the center line of the plate mounting surface (A) (41) so as to sandwich and weld the end of the fourth brace (36) onto the lower end of the plate mounting surface (A) (41), so that the end of the fourth brace (36) is sandwiched and welded. The end of the fourth brace (36) is welded onto the lower end of the plate mounting surface (A) (41) by abutting the end where the side (K) (110) and the steel column mounting portion (111) intersect with the lower end of the plate mounting surface (A) (41), and the steel frame mounting portion (111) is welded to the plate mounting surface (A) (41). The brace fixing lower end plate (30) thus constructed is molded with the following dimensions: side (I) (108) is 70 mm, side (J) (109) is 90 mm, the angle at which side (I) (108) and side (J) (109) intersect is 90 degrees, side (K) (110) is 86 mm, the angle (C) at which side (K) (110) and side (J) (109) intersect is 234.5 degrees, the angle (D) at which the steel column mounting part (111) and side (K) (110) intersect is 305.5 degrees, and the dimension of the steel column mounting part (111) is 140 mm. The overlap width (G) (136) of the side (NN) (193) of the portion overlapped in a sandwich shape with the lower end plate (30) for fixing the brace is formed to a dimension of 55 mm, and similarly, the overlap width (H) (137) is a portion for abutting the side (OO) (194) of the fourth brace (36) so as to overlap with the side (K) (110) of the lower end plate (30) for fixing the brace so as to be welded together in a sandwich shape, and the overlap width (H) (137) is formed to a dimension of 12 mm.
Furthermore, in order to sandwich the ends of the first brace (33) and the second brace (34) in a sandwich-like manner and weld them together at a quarter position from the upper end on the center line of the plate mounting surface ( B) (40) of the second steel column (12), the brace fixing upper plate (31) formed of a rectangular plate with a thickness of 6 mm has a side (M) (112) dimension of 70 mm, a side (P) (115) dimension of 230 mm, a side (O) (114) dimension of 70 mm, and a steel column mounting portion (113) dimension of 230 mm. The side (BB) (181) of the first brace (33) is abutted so as to contact the tip where the side (M) (112) and the side (P) (115) intersect, and the overlap width (I) (138) of the overlapped side (BB) (181) is formed to be 69 mm in order to sandwich and overlap and weld together the side (BB) (181) in a sandwich shape. Similarly, the overlap width (J) (139) of the side (CC) (182) of the first brace (33) is formed to be 12 mm in order to sandwich and weld together the side (CC) (182) in a sandwich shape. The side (CC) (182) is then shaped to be the same shape. The edge (GG) (186) of the second brace (34) is abutted against the tip where the edge (P) (115) and edge (O) (114) of the two brace fixing upper plates (31) formed by the above process intersect, and the overlap width (L) (141) of the overlapped edge (GG) (186) is formed to be 75 mm in order to sandwich and weld the two brace fixing upper plates together in a sandwich shape. Similarly, the overlap width (K) (140) of the edge (FF) (185) of the overlapped portion of the second brace (34) is formed to be 75 mm in order to sandwich and weld the two brace fixing upper plates together in a sandwich shape. The brace fixing lower plate (32) is formed with a thickness of 6 mm and has a side (Q) (116) of 70 mm, a side (T) (119) of 230 mm, a side (S) (118) of 70 mm, and a steel column mounting portion (116) of 12 mm. The brace fixing lower plate (32) is formed with a rectangular plate with a thickness of 6 mm and is welded to sandwich the ends of the third brace (35) and the fourth brace (36) in a sandwich shape at a position one-quarter of the way from the lower end on the center line of the plate mounting surface (B) (40) of the second steel column (12). The dimension of the overlap width (M) (142) of the overlapped side (JJ) (189) of the third brace (35) is formed to be 230 mm, and the side (JJ) (189) of the third brace (35) is abutted so as to contact the tip where the side (Q) (116) and the side (T) (119) intersect, and the overlap width (M) (142) of the overlapped side (JJ) (189) is formed to be 75 mm in order to overlap and weld the overlapped side (JJ) (189) in a sandwich shape. Similarly, the dimension of the overlap width (N) (143) of the side (KK) (190) of the third brace (35) is formed to be 13 mm in order to overlap and weld the overlapped side (K) (190) in a sandwich shape. The edge (OO) (194) of the fourth brace (36) is abutted against the tip where the edge (T) (119) and edge (S) (118) of the two brace fixing lower plates (32) formed in the same shape intersect, and the overlap width (P) (145) of the overlapped edge (OO) (194) is formed to be 69 mm in order to sandwich and weld the two brace fixing lower plates (32) together, and similarly, the overlap width (O) (144) of the overlapped edge (NN) (193) is formed to be 12 mm in order to sandwich and weld the two brace fixing lower plates (32) together.
an upper end plate (28) for fixing a brace, upper and lower central plates (29) for fixing a brace, and a lower end plate (30 ) for fixing a brace which are welded to the plate mounting surface (A) (41 ) of the first steel column (11); and an upper plate ( 31) for fixing a brace and a lower plate (32) for fixing a brace which are welded to the plate mounting surface (B) (40) of the second steel column (12) located opposite the upper end plate (28) , and ends of four first braces (33) , second braces (34), third braces (35), and fourth braces (36) formed from square steel pipes with a side length of 80 mm and a wall thickness of 2.3 mm are welded to the upper end plate (28), upper and lower central plates (29) for fixing a brace, and a lower end plate (30) for fixing a brace which are welded to the plate mounting surface (B) (40) of the second steel column (12) located opposite the upper end plate (28),