JP5486430B2 - Strength frame structure - Google Patents

Description

  The present invention relates to a structure of a load-bearing frame used as a load-bearing wall of a steel frame structure building.

  Conventionally, various strength frames have been proposed in buildings with a steel frame structure, in particular, low-rise buildings such as standardized houses (for example, see Patent Documents 1 and 2 below).

  For example, in Patent Document 1 below, as an oblique material used in a load bearing frame, a long plate-shaped brace core material that bears an axial force, and a cylindrical shape that is substantially the same length as the brace core material, and the brace core. A buckling-restrained brace comprising an external stiffener that is extrapolated to the material is described. The outer stiffener has a deformed portion that is deformed inward by an external pressure applied to the brace core, and buckling of the brace core is suppressed by the deformed portion.

  Moreover, in the following patent document 2, as a diagonal material used for a load-bearing frame, a long plate-like brace core material that bears an axial force, and a length substantially the same as this brace core material, What includes extrapolated stiffeners is described. The stiffener includes a main stiffener having a receiving plate facing the brace core, and a secondary stiffener that is U-shaped in cross section and covers the main stiffener receiving plate and is fixed to the main stiffener. Made of rigid material. And a brace core material is clamped by the receiving plate part of a main stiffener, and the web of a substiffener, and an out-of-plane buckling is suppressed.

JP 2008-75281 A JP 2008-75280 A

  By the way, since the diagonal material bears a substantial axial force only to the brace core material, it is necessary to fix the brace core material to a column or the like. For this reason, it is necessary to provide the protruding part which protrudes from a stiffener at the both ends of a brace core material. However, in the configurations of Patent Documents 1 and 2, the strength of the protruding portion of the brace core material is low, and there is room for improvement.

  The present invention has been devised in view of the above-described problems, and mainly provides a structure of a load-bearing frame that can effectively reinforce the protruding portion of the brace core material with a low-cost and simple structure. It is aimed.

  The invention according to claim 1 of the present invention is a structure of a load bearing frame constructed on a vertical structural surface between a foundation and a beam extending thereon, or a vertical structural surface between upper and lower beams. A first pillar member and a second pillar member extending up and down in parallel with each other, and a diagonal member extending obliquely between the first pillar member and the second pillar member, The diagonal member is composed of a brace core made of a plate material whose out-of-plane buckling direction is arranged in parallel to the vertical construction surface, and the brace by being attached to both sides of the out-of-plane buckling direction of the brace core material. An inner stiffener made of a pair of grooved steels that prevent out-of-plane buckling of the core material and the groove portion faces the brace core material side, and is extrapolated to the brace core material and the inner stiffener material at least. A cylindrical outer stiffener that restrains both in the out-of-plane buckling direction, and both ends of the brace core are connected to the inner stiffener. And a protruding portion that protrudes from the outer stiffener, and the protruding portion of the brace core material is fixed to both side surfaces of the brace core material in the out-of-plane buckling direction, thereby at least a part of the protruding portion. A pair of reinforcing ribs having a substantially cross-shaped cross section is provided, and a part of the reinforcing rib extends in a space surrounded by the brace core material and the inner stiffener.

  In the invention according to claim 2, the protruding portion of the brace core material is fixed to the first column material or the second column material via a mounting plate, and the mounting plate is disposed on both sides in the width direction of the protruding portion. 2. The structure of a load-bearing frame according to claim 1, comprising a pair of plate members fixed to each other and extending in parallel with the vertical construction surface.

  The invention according to claim 3 is the structure of the load-bearing frame according to claim 2, wherein the protruding portion is provided apart from the first pillar material and the second pillar material.

  According to a fourth aspect of the present invention, the end plate has a facing surface that can come into contact with the end surface of the external stiffener when the brace core member is subjected to large compression deformation. This is the structure of the load-bearing frame.

  According to a fifth aspect of the present invention, the diagonal member includes an upper diagonal member extending from a substantially middle portion in the length direction of the first column member to an upper end side of the second column member, and the upper diagonal member Is a structure of the load-bearing frame according to any one of claims 1 to 4, which is fixed to a lower side than a structural core on an upper end side of the second column member.

  According to a sixth aspect of the present invention, the diagonal member includes a lower diagonal member extending from a substantially middle portion in the length direction of the first column member to a lower end side of the second column member, and the lower diagonal member Is a structure of a load-bearing frame according to any one of claims 1 to 5, which is fixed to an upper side of a structural core on a lower end side of the second pillar member.

  In the load-bearing frame of the present invention, the diagonal member is composed of a brace core material made of a plate material in which the out-of-plane buckling direction is arranged in parallel with a vertical construction surface such as between beams, and both sides of the brace core material in the out-of-plane buckling direction An internal stiffener made of a pair of channel steels that prevent the out-of-plane buckling of the brace core material by being attached to the brace core material side, and the brace core material and the inner A cylindrical outer stiffener that is extrapolated to the stiffener and restrains at least both in the out-of-plane buckling direction. A pair of protrusions protruding from the stiffener of the brace core material are fixed to both side surfaces of the brace core material in the out-of-plane buckling direction so that at least a part of the protrusions has a substantially cross-shaped cross section. Reinforcing ribs are provided.

  Such a reinforcing rib can increase the rigidity against the out-of-plane buckling of the protruding portion by making the cross section of the protruding portion of the brace core material into a substantially cross shape. In addition, a part of the reinforcing rib extends and terminates in a space surrounded by the brace core material and the internal stiffener made of the channel steel. Thus, the reinforcing effect is further improved by arranging the reinforcing rib so as to straddle both the protruding portion and the non-extruding portion of the brace core material. Further, the reinforcing rib can be provided without interfering with the internal stiffener. Accordingly, the reinforcing rib can be fixed to the brace core material without processing the inner stiffener made of the grooved steel, such as a notch. Therefore, according to the structure of the load-bearing frame of the present invention, the end portion reinforcement of the brace core material can be realized with a low cost and a simple structure.

It is a front view of the frame assembly using the load-bearing frame of this embodiment. FIG. FIG. 3 is an exploded view of FIG. 2. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 5 is a cross-sectional view of FIG. 4. It is a disassembled perspective view of an oblique material. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a partial front view which shows embodiment of the attachment plate of an upper side. It is a partial front view which shows embodiment of the lower side attachment plate. It is a fragmentary sectional view of the lower diagonal material which shows the state at the time of large deformation of the diagonal material.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the load-bearing frame 1 of the present embodiment is installed on a vertical construction surface S <b> 1 between a foundation 2 and a beam 3 extending horizontally along the foundation 2. Thus, for example, a part of the frame structure F1 on the first floor of the steel frame structure house is configured. Needless to say, the load-bearing frame 1 may be disposed on the vertical surface S2 between the beams 3 and 3 of the second-order frame structure F2.

  The load-bearing frame 1 includes a first pillar member 4 and a second pillar member 5 that extend vertically above and below the vertical construction surface S1 in parallel with each other, and between the first pillar member 4 and the second pillar member 5. And a diagonal member 6 that extends in a slanted manner.

  The first pillar member 4 and the second pillar member 5 are formed of steel pipes having a square pipe shape in cross section, and the lower ends thereof are fixed to a mounting box B1 having a substantially box shape. The mounting hardware B1 is fixed to an anchor bolt 2a protruding from the foundation 2. A foundation or the like may be interposed between the foundation 2 and the mounting hardware B1.

  A mounting plate B2 made of a substantially horizontal plate material is fixed to the upper ends of the first pillar material 4 and the second pillar material 5. The mounting plate B2 is fixed to the corner hardware C or the beam 3 with bolts. The corner hardware C is rigidly joined to the beam 3 and can be regarded as a part of the beam 3.

  Further, as shown in FIGS. 3 to 5, the first pillar member 4 has an upper receiving piece 7 projecting toward the second pillar member 5 at the substantially central portion in the length direction, and a lower member. The receiving metal 8 is provided at a distance in the vertical direction.

  The upper metal piece 7 is a pair of side plate portions 7a, 7a fixed by welding to a column surface 4a facing the second column member 5 side, and an approximately fixed surface fixed by welding to the lower surface of the side plate portion 7a. It is comprised from the horizontal plate-shaped receiving part 7b. In the receiving portion 7b, a through hole 7c is formed at a substantially central portion, and a substantially horizontal first mounting surface 10 is formed on the lower surface of the receiving portion 7b.

  Similarly, the lower receiving piece 8 is also fixed to the pair of side plate portions 8a, 8a fixed to the column surface 4a of the first column member 4 by welding and to the upper surface of the side plate portion 8a by welding. It is comprised from the substantially horizontal plate-shaped receiving part 8b. The receiving portion 8b is also formed with a through hole 8c in a substantially central portion, and a second mounting surface 11 that is substantially horizontal is formed on the upper surface of the receiving portion 8b. The second mounting surface 11 faces the first mounting surface 10 of the upper metal fitting 7 in parallel and is positioned below the first mounting surface 10.

  The diagonal member 6 includes an upper diagonal member 6 </ b> A extending from a substantially middle portion in the length direction of the first column member 4 to the upper end side of the second column member 5, and an approximately lengthwise direction of the first column member 4. And a lower diagonal member 6B extending from the intermediate portion to the lower end side of the second pillar member 5. The upper diagonal member 6 </ b> A of the present embodiment has an inclination that descends from the second pillar member 5 toward the first pillar member 4. Conversely, the lower diagonal member 6 </ b> B of the present embodiment has an inclination that rises from the second pillar member 5 toward the first pillar member 4. For each of the diagonal members 6A and 6B, so-called buckling-restrained braces that exhibit sufficient deformation resistance without being greatly buckled even when a compressive force is applied as well as a tensile force are employed.

  Furthermore, in the present embodiment, as shown in FIG. 3, one end side of the upper diagonal member 6A and the lower diagonal member 6B is fixed to the second column member 5 in advance at the factory or the like, and the upper diagonal member 6A. The other end of the lower diagonal member 6B is fixed to the joint member 15. As a result, the load-bearing frame 1 of the present embodiment includes a first pillar member 4 and a triangular frame body having a substantially isosceles triangular shape that is convex toward the first pillar member 4 when viewed from the front facing the wall. 9 is connected to the upper and lower receiving pieces 7 and 8 with bolts or the like. Thus, by constructing the load-bearing frame 1 in two parts, the transportability to the site can be improved and the workability at the site can be greatly improved.

  FIG. 6 shows a perspective view of the upper diagonal material 6A as a representative example of the diagonal material 6 (the lower diagonal material 6B has the same configuration). 7 to 9 show cross-sectional views taken along lines AA, BB, and CC in FIG.

  As shown in FIGS. 6 to 9, the diagonal member 6 includes a brace core member 16 and an inner stiffener 17 and an outer stiffener 18 for suppressing the out-of-plane buckling. .

  Although details will be described later, the end portions of the brace core material 16 are fixed to the first pillar material 4 and the second pillar material 5, respectively. Thereby, the brace core material 16 can bear the axial force of the frame assembly F1. The brace core material 16 is formed of a long plate material in which the out-of-plane buckling direction X (shown in FIGS. 6 and 7) is arranged in parallel with the vertical construction surface S1 (vertical surface). That is, the direction of the thickness t1 and the direction of the length L1 of the brace core 16 are parallel to the vertical plane S1, and the direction of the width W1 of the brace core 16 is orthogonal to the vertical plane S1. By arranging the brace core material 16 in such a direction, even if a large deformation occurs in the shaft assembly structure F1 and a large out-of-plane buckling occurs in the brace core material 16, the wall material of the shaft assembly structure, etc. It is possible to prevent the diagonal member 6 deformed into contact with the wall member and the like from being damaged.

  For the brace core material 16, for example, various steel materials such as carbon steel, stainless steel or alloy steel are employed. Although not particularly limited, an extremely low yield point steel or the like is suitable for the brace core material 16. Extremely low yield point steel has a yield point of about ¼ to ３ as compared to general steel (for example, SM490 and SS400), but can exhibit very excellent performance with respect to elongation of 50% or more.

  The brace core material 16 may have a surface plated to reduce friction with the inner stiffener 17 or the outer stiffener 18. The brace core material 16 of the present embodiment has, for example, a long plate shape with a rectangular cross section, and has a width W1 of about 20 to 100 mm and a thickness t1 of about 3 to 15 mm, for example.

  As shown in FIG. 7, the inner stiffener 17 is a pair of groove steels arranged so that the brace core 16 is sandwiched between both side surfaces 16 a in the out-of-plane buckling direction X of the brace core 16. 17A and 17B. Each groove steel 17A, 17B has a web 17a and a pair of flanges 17b projecting from both sides thereof, and each groove is fixed toward the brace core 16 side. The inner stiffener 17 is arranged such that the width between the flanges 17b and 17b is set smaller than the width W1 of the brace core 16, and the end face 17b1 of the flange 17b sandwiches the brace core 16 from both sides.

  As indicated by a welded portion j in FIG. 7, the inner stiffener 17 is partially welded to the brace core 16 with a small length, for example, at an intermediate portion in the length direction. Thereby, the position shift of the inner stiffener 17 and the brace core material 16 is prevented, and the effect of preventing the out-of-plane buckling of the brace core material 16 by the inner stiffener 17 is exhibited. In addition, since the welding is limited to a small length, the brace core 16 can freely extend in the length direction without being restrained by the internal stiffener 17 and reliably bears the axial force. it can.

  As shown in FIGS. 6 and 7, the external stiffener 18 according to the present embodiment is made of, for example, a square tubular steel material that is extrapolated to the brace core 16 and the internal stiffener 17. The outer stiffener 18 can restrain buckling by restraining at least the brace core 16 and the inner stiffener 17 in the out-of-plane buckling direction X. In the present embodiment, the dimension of the inner peripheral surface of the outer stiffener 18 is such that the clearance with the inner stiffener 17 is reduced in the out-of-plane buckling direction X and the displacement is suppressed. As a more preferred embodiment, the outer stiffener 18 also has a displacement in the width direction by reducing the gap between both sides of the brace core 16 in the width W1 direction in the direction orthogonal to the out-of-plane buckling direction X. What suppresses smallly is desirable.

  When assembling the diagonal member 6, the outer stiffener 18 is preferably fitted into an assembly in which the inner stiffener 17 and the brace core 16 are welded in advance. In addition, after the fitting, the outer stiffener 18 is preferably integrated with the inner stiffener 17 by a fixing means such as caulking or welding. In the present embodiment, the inner stiffener 17 is formed to be longer than the outer stiffener 18, and both ends of the inner stiffener 17 protrude from the both ends of the outer stiffener 18 with a small length. .

  Both ends of the brace core member 16 need to be fixed to the first pillar member 4 and the second pillar member 5 in order to bear the axial force of the frame structure F1, while the inner stiffener 17 The outer stiffener 18 should not be fixed to the first pillar member 4 and the second pillar member 5. Therefore, the brace core 16 of the diagonal member 6 is formed longer than the inner stiffener 17 and the outer stiffener 18, and both ends of the brace core 16 protrude from the inner stiffener 17 and the outer stiffener 18. 20 is formed. In the present embodiment, one end side of the protruding portion 20 is fixed to the second column member 5 via the mounting plate 22. Of course, the inner stiffener 17 and the outer stiffener 18 are spaced apart from the mounting plate 22 without contacting them. The diagonal member 6 configured in this manner does not stretch or buckle relative to the brace core 16 with respect to the inner stiffener 17 and the outer stiffener 18 when an axial force is applied. Can be compressed.

  As shown in FIGS. 6, 8, and 9, a pair of reinforcing ribs 21 are provided on the protruding portions 20 on both sides of the brace core 16.

  The reinforcing rib 21 is fixed integrally by, for example, fillet welding, with the inner end face 21b abutting against both side faces 16a of the brace core 16 in the out-of-plane buckling direction X and an intermediate portion of the width W1. Reference symbol j indicates a welded portion. The reinforcing rib 21 of the present embodiment is made of a metal plate material whose width direction is along the out-of-plane buckling direction X of the brace core material 16. The thickness t2 of the reinforcing rib 21 is formed substantially the same as the thickness t1 of the brace core material 16, but is not limited to such a mode.

  As shown in FIG. 8, the reinforcing rib 21 protrudes from the both side surfaces 16 a of the brace core member 16 to both sides in the out-of-plane buckling direction X and is integrated with the brace core member 16. The section 20 has a substantially cross-shaped cross section. That is, it is possible to increase the cross-sectional second moment with respect to the bending of the protruding portion 20 in the out-of-plane buckling direction, and to increase the rigidity against the out-of-plane buckling. Therefore, even when a horizontal displacement occurs in the shaft structure F1, the out-of-plane buckling of the protruding portion 20 that is not restrained by the stiffeners 17 and 18 can be reinforced with a simple structure. Effective buckling deformation can be effectively prevented.

  In addition, as shown in FIGS. 5, 6, 10, and 11, a part of the reinforcing rib 21 is part of the inner stiffener 17 in the space i surrounded by the brace core member 16 and the inner stiffener 17. It ends without interfering with. As a result, the reinforcing rib 21 is disposed across both the protruding portion 20 of the brace core material 16 and the non-extruded portion 23 where the buckling of the inner stiffener 17 on the brace core material 16 is restrained. . Moreover, the outer end 21a of the reinforcing rib 21 of the present embodiment is provided in the non-extrusion portion 23 with a small gap therebetween without interfering with the inner surface of the web 17a of the inner stiffener 17.

  Such a reinforcing rib 21 can be provided on the inner stiffener 17 side, for example, without processing such as a notch for preventing interference with the reinforcing rib 21. Therefore, according to the structure of the load-bearing frame 1 of the present invention, it is possible to reliably reinforce the end portion (the protruding portion 20) of the brace core member 16 with a low-cost and simple structure. Further, by adjusting the length, thickness and / or height (corresponding to the width of the plate material) of the reinforcing rib 21, the yield strength performance can be arbitrarily adjusted. In addition, a part of the reinforcing rib 21 is disposed so as to straddle the non-extrusion portion 23 that exhibits high out-of-plane buckling resistance by being restrained by the inner stiffener 17. For this reason, the reinforcing rib 21 can also bear a part of the buckling load acting on the protruding portion 20 on the non-extruding portion 23. Therefore, in this embodiment, the out-of-plane buckling performance of the protruding portion 20 can be further improved.

  In addition, since the outer end 21a of the reinforcing rib 21 protrudes from the both side surfaces 16a of the brace core member 16, even if out-of-plane buckling occurs in the protruding portion 20, the void of the inner stiffener 17 is provided. The outer end 21a of the reinforcing rib 21 extending in i comes into contact with the inner peripheral surface of the inner stiffener 17 so that the buckling amount can be suppressed within a certain range. From such a viewpoint, it is desirable that a gap h of, for example, about 5 to 20 mm is formed between the outer end 21a of the reinforcing rib 21 in the out-of-plane buckling direction X and the web 17a.

  As shown in FIGS. 6 and 9, in the present embodiment, the mounting plate 22 has a substantially triangular shape in a front view facing the vertical composition plane S <b> 1 and is attached to the second pillar 5. A pair of metal plates including a surface 22a, a lower slope 22b extending obliquely upward from the longitudinal surface 22a, and an upper slope 22c extending obliquely downward from the longitudinal surface 22a, and extending parallel to the vertical surface S1. Become. The mounting plate 22 is fixed to both side edges in the width direction of the protruding portion 20 by fillet welding. Further, the vertical surface 22a of the mounting plate 22 is welded at a position close to the outer surface 5a of the second column member 5 facing the first column member 4 and both corners. Therefore, according to the present embodiment, the brace core material 16 that is inclined with respect to the second pillar material 5 that extends vertically can be easily fixed to the second pillar material 5.

  Further, as shown in FIG. 9, the protruding portion 20 to which the mounting plate 22 is fixed has a substantially H-shaped cross section in which the brace core 16 is a web and the mounting plate 22 is a flange. Since such a protruding portion 20 has a greater moment of inertia in cross section with respect to bending in the out-of-plane buckling direction, the out-of-plane buckling performance of the protruding portion 20 of the brace core 16 is further improved. Moreover, in the present embodiment, the reinforcing rib 21 fixed to the protruding portion 20 is provided so as to overlap with the mounting plate 22 in the longitudinal direction of the brace core member 16 as shown in FIGS. For this reason, the out-of-plane buckling performance of the protruding portion 20 is further improved, and a more stable load resistance characteristic can be obtained.

  Further, the protruding portion 20 of the present embodiment terminates in front of the second pillar member 5 without coming into contact therewith. That is, the diagonal member 6 and the second pillar member 5 are joined only by the mounting plates 22 fixed to both sides of the brace core member 16, and the brace core member 16 itself is separated from the second pillar member 5. ing. If the end portion of the brace core 16 is directly welded and fixed to the second column member 5, for example, when a tensile force acts on the diagonal member 6, the deformation of the outer surface 5a of the second column member 5 becomes large. The durability is difficult. On the other hand, as in the present embodiment, the protruding portion 20 is separated from the second pillar member 5 and the protruding portion 20 is fixed to the corner side of the outer surface 5a of the second pillar member 5 and fixed. By fixing through the plate 22, the deformation of the outer surface 5a of the second pillar 5 can be suppressed and the durability can be enhanced.

  Furthermore, in a preferred embodiment, it is desirable that the mounting plate 22 has a facing surface 24 that can come into contact with the end surface 18a of the external stiffener 18 when the brace core 16 is subjected to large compression deformation. In the present embodiment, as shown in FIG. 10, the lower inclined surface 22 b forms an opposing surface 24 for the mounting plate 22 to which the upper oblique member 6 </ b> A is fixed. On the other hand, as shown in FIG. 11, with respect to the mounting plate 22 to which the lower diagonal member 6 </ b> B is fixed, the upper inclined surface 22 c forms the facing surface 24.

  The facing surface 24 of the mounting plate 22 is formed as a substantially parallel surface that faces at least a part of the end surface 18a of the external stiffener 18 having a rectangular tube shape when the load-bearing frame 1 is statically stable. Has been. Then, as shown in FIG. 12 representatively of the lower diagonal member 6B side, when a sudden compression deformation occurs in the brace core member 16, the end face 18a of the outer stiffener 18 becomes the upper inclined surface 22c of the mounting plate 22. Can be substantially in surface contact with the opposing surface 24. Therefore, in such a load-bearing frame 1, even when an unexpected external force is applied to the building and the brace core material 16 can no longer bear the compressive force, the end face 18 a of the external stiffener 18 is opposed to the mounting plate 22. The external stiffener 18 functions as a rectangular tube-shaped compression brace material against the unexpected load due to surface contact with 24, thereby preventing the building from collapsing. In addition, the inner stiffener 17 of this embodiment is formed in a dimension that can enter between the mounting plates 22 and 22 during the compression deformation.

  In the present embodiment, as shown in FIGS. 10 and 11, the upper diagonal member 6 </ b> A is lower than the structural core P <b> 1 on the upper end side of the second column member 5 in the front view of the vertical surface S <b> 1. (In other words, it is desirable that the crossing point Ps between the extension line of the upper diagonal member 6A and the center line of the column member 5 is lower than P1). Similarly, the lower diagonal member 6B has an upper side than the structural core P2 on the lower end side of the second column member 5 (that is, the intersection point Ps between the extension line of the lower diagonal member 6B and the center line of the column member 5 is from P2. It is desirable that the upper side is also fixed. Here, the structural core P1 on the upper end side of the second pillar material 5 is the structural core (center line) CL1 of the second pillar material 5 and the structural core (center line) CL2 of the beam 3 on the upper side. Intersection. The structural core P2 on the lower end side of the second pillar member 5 is an intersection of the upper surface of the foundation and the structural core (center line) CL1 of the second pillar member 5.

  In the above configuration, a sufficient space can be formed between the diagonal member 6 and the beam 3 or between the diagonal member 6 and the foundation 2. Therefore, it is possible to easily and efficiently install the ceiling material 30, the floor material 31 and the like while arranging the load-bearing frame 1, and the workability and productivity are improved. In particular, the mounting plate 22 having a triangular shape in front view is useful for expanding the space.

  As shown in FIGS. 1 to 5, the other end sides of the diagonal members 6 </ b> A and 6 </ b> B are fixed to the first column member 4 via the joint member 15.

  4 and 5, the splicing member 15 of this embodiment is welded to a groove-type frame member 15a with the groove portion facing the second column member 5 and the upper end of the frame member 15a. Thus, the upper plate 15b that forms the upper end surface U of the joint member 15 and the lower plate 15c that forms the lower end surface D of the joint member 15 by being welded to the lower end of the frame member 15a. Further, the upper plate 15b and the lower plate 15c are formed with through holes 15d concentrically aligned with the through holes 7c and 8c provided in the upper and lower metal objects 7 and 8, respectively.

  The upper end surface U of the upper plate 15b of the joint member 15 and the lower end surface D of the lower plate 15c are formed as a substantially flat horizontal plane. The vertical length of the joint member 15 from the upper end surface U to the lower end surface D is the vertical direction between the first mounting surface 10 and the second mounting surface 11 of the upper and lower receiving metal objects 7 and 8. It is formed slightly smaller than the height of the gap.

  The joint member 15 is fixed to the first pillar member 4 fixed in advance between the first pillar member 4 foundation 2 and the beam 3 by bolts 25. The bolt 25 includes an upper bolt 25A and a lower bolt 25B. The upper bolt 25 </ b> A fastens the upper plate 15 b of the joint member 15 and the upper metal piece 7. Further, the lower bolt 25 </ b> B fastens the lower plate 15 c of the joint member 15 and the lower receiving piece 8. Each of the bolts 25A and 25B is inserted into the through hole 15d from the receiving metal side and is screwed to a nut 26 welded to the inside of the joint member 15.

  The upper end surface U and the lower end surface D of the joint member 15 of the triangular frame body 9 are in surface contact with the horizontal first and second mounting surfaces 10 and 11, respectively, and are fixed by the upper bolt 25A and the lower bolt 25B. At this time, the gap between the joint member 15 and the metal objects 7 and 8 is appropriately adjusted by interposing a shim or the like as necessary.

  When a horizontal load is applied to the shaft assembly F <b> 1, the triangular frame body 9 is displaced up and down relatively with respect to the first column member 4. However, the first column member 4 and the triangular frame body 9 can receive a horizontal load acting on the frame structure F1 in the surface pressure direction of the first and second mounting surfaces 10 and 11 that are horizontal. it can. This is because the shearing force acting on the joint surface can be greatly reduced compared to the case where the horizontal load of the frame structure is received on the vertical surface, and the position fixing of both members 4 and 9 is made more reliable and the joint surface It is possible to reliably prevent displacement due to slippage. Further, as a result of receiving a horizontal load in the surface pressure direction, even when a standard medium bolt or the like is used for the bolts 25A and 25B, breakage or the like can be effectively prevented, and the durability of the frame assembly F1 can be reduced at low cost. It can also improve sex.

  Although the embodiment of the present invention has been described in detail above, it goes without saying that the load-bearing frame 1 of the present invention can be implemented with various modifications. For example, the reinforcing rib 21 of the present embodiment has a constant height and width, but these can be partially changed.

DESCRIPTION OF SYMBOLS 1 Load bearing frame 2 Foundation 3 Beam 4 1st pillar material 5 2nd pillar material 6 Diagonal material 6A Upper diagonal material 6B Lower diagonal material 15 Joint member 16 Brace core material 17 Internal stiffeners 17A, 17B Groove type steel 18 External complement Rigid material

Claims (6)

A structure of a load-bearing frame constructed on a vertical plane between a foundation and a beam extending above it, or a vertical plane between upper and lower beams,
A first pillar member and a second pillar member extending vertically in parallel with each other, and an oblique member extending obliquely between the first pillar member and the second pillar member; And
The diagonal member is a brace core made of a plate material in which an out-of-plane buckling direction is arranged in parallel with the vertical construction surface;
The brace core material is attached to both sides in the out-of-plane buckling direction to prevent out-of-plane buckling of the brace core material and from a pair of groove steels arranged with the groove portion facing the brace core side. An inner stiffener,
A cylindrical outer stiffener that is extrapolated to the brace core and inner stiffener and restrains at least both in the out-of-plane buckling direction;
Both ends of the brace core have protrusions that protrude from the inner and outer stiffeners,
The protruding portion of the brace core member is provided with a pair of reinforcing ribs that are fixed to both side surfaces of the brace core member in the out-of-plane buckling direction so that at least a part of the protruding portion has a substantially cross-shaped cross section. And
A part of the reinforcing rib extends in a space surrounded by the brace core material and the inner stiffener. The protruding portion of the brace core material is fixed to the first pillar material or the second pillar material via the mounting plate,
2. The structure of a load bearing frame according to claim 1, wherein the mounting plate is composed of a pair of plate members that are fixed to both sides of the protruding portion in the width direction and extend in parallel with the vertical construction surface.   The structure of the load-bearing frame according to claim 2, wherein the protruding portion is provided apart from the first pillar material and the second pillar material.   The structure of the load-bearing frame according to any one of claims 2 to 4, wherein the end plate has an opposing surface that can come into contact with an end surface of the external stiffener when the brace core material is subjected to large compression deformation.   The diagonal member includes an upper diagonal member extending from a substantially middle portion in the length direction of the first column member to an upper end side of the second column member, and the upper diagonal member is formed of the second column member. The structure of the load-bearing frame according to any one of claims 1 to 4, wherein the structure is fixed to a lower side than a structural core on an upper end side.   The diagonal member includes a lower diagonal member extending from a substantially middle portion in a length direction of the first column member to a lower end side of the second column member, and the lower diagonal member is formed of the second column member. The structure of a load-bearing frame according to any one of claims 1 to 5, wherein the structure is fixed to an upper side of a structural core on a lower end side.

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