JP6440942B2 - Bearing wall structure using braces of steel building - Google Patents

Description

  The present invention relates to a bearing wall structure using braces in a steel structure building such as a steel frame detached house.

  As a steel-framed detached house, a tensile brace type is generally used, but recently, various types of bearings having a spindle-type hysteresis characteristic have been proposed as a bearing wall of a steel-framed detached house. Examples thereof are shown in FIGS. In the example of FIG. 9A, the brace 31 is arranged in the X shape, and in the example of FIG. 9B, the brace 32 is arranged in the K shape, and the braces 31, 32 are provided with a damper that absorbs energy applied by an earthquake or the like. What is used also is used, or a damper (not shown) is interposed. In the example shown in FIG. 9C, two sets of X-type braces 34 are used in the vertical direction, and dampers 33 are interposed at the intersections of the upper and lower braces 34.

JP2011-162982A Japanese Patent No. 0368722

  In the conventional examples of the respective types shown in FIGS. 9A to 9C, columns 35 for receiving a reaction force on both sides of the bearing wall are necessary. For this reason, for example, when two bearing walls are arranged in succession, three columns 35 are required, and openings are not provided at the positions, so that the degree of freedom in design is limited, which causes a cost increase. In the case of a detached house with a frame structure, the tendency tends to be remarkable.

  The mold bearing wall shown in FIG. 9 (D) is an example previously proposed (Japanese Patent Application No. 2012-206778), and the upper end of the brace 36 is joined to the upper corner which is the joint of the left column 37 and the beam 38. The lower end is joined to the lower end portion of the right column 37 via a spindle type hysteresis damper 39. This yields the damper 39 with respect to other members, and the brace 36 also acts as a compression brace. Also in this example, the pillar 35 for receiving the reaction force of the brace 36 is necessary.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a bearing wall structure using braces for a steel structure building that can reduce the number of columns and can increase the degree of design freedom and reduce the cost.

A steel building building bearing wall structure using braces according to the present invention is a steel building having a plurality of or one bearing wall using braces.
Wherein one of the upper end of the brace in the bearing wall is joined at or near the beam joint portion of the columns and beams, the side surface of the joining hardware to lower end portions that have not been built pillar of RC structures foundation is joined, spindle-shaped One side of a hysteresis damper is attached, and the lower end of the brace is joined to a side opposite to the one side attached to the joint metal fitting of the damper, and the brace has both tensile force and compressive force. The damper has a pair of parallel plate portions arranged in parallel to each other, a plate-like web portion for energy absorption obtained by connecting the pair of parallel plate portions, and the pair of parallel plates. A pair of vertical plate portions that are respectively connected between both ends of the portion and joined to the web portion, and the pair of vertical plate portions are respectively the one side surface of the damper and the opposite side of the damper. The web portion is inclined with respect to the wall surface of the load-bearing wall and the parallel plate portion, and has a cross-sectional mountain shape in which the inclination direction is different between a part in the longitudinal direction and the other part, and The position where the edge of the web part in the plate part is connected is separated from the edge of the parallel plate part in the height direction of the chevron formed by the web part . In addition, said "location where the pillar is not built" means that the location where the lower end of the brace is joined to the RC foundation is not the immediate side of the column.

  According to this configuration, since the lower end of the brace is joined to the RC foundation, the reaction force of the force acting from the brace is received by the RC foundation, and a column is unnecessary as a member that receives the reaction force. Therefore, the number of columns can be reduced, and an opening can be provided in a portion where the columns are omitted. For example, the degree of freedom in design is increased, and the cost can be reduced by reducing the number of columns.

Before SL braces, it has a function to bear both the tensile force and compressive force. Using a brace that bears both tensile and compressive forces, even if only one brace is used for the bearing wall, both the left and right horizontal forces can be borne by one bearing wall. The number of bearing walls can be reduced, and design flexibility is further expanded.

In addition, if a spindle type hysteresis damper is used, the vibration damping function is excellent, but even when such a damper is used, it is possible to reduce the number of columns by joining the brace to the RC foundation via the damper. It is possible to expand design freedom and reduce costs.

In the bearing wall structure using braces of the steel building according to the present invention, the steel building is a modular design building in which a pillar is built at an integral multiple of the module on the RC foundation, and the lower end of the brace is , You may join to the place where the pillar is not built in the module position in the RC foundation. The integer multiple includes 1 time.
Even in such a module-designed building, according to the present invention, it is possible to omit providing a column at the module position and to increase the degree of design freedom and reduce the cost.

In the steel building building bearing wall structure using braces according to the present invention, in the steel building having a plurality of or one bearing wall using braces, the upper end of the brace in any one of the bearing walls is connected to a column and a beam. One side surface of a spindle type hysteresis damper is attached to the side of the joint metal that is joined to the vicinity of the part or to the beam and the lower end is joined to the part where the column is not built in the RC foundation. A lower end of the brace is joined to a side surface opposite to the one side surface attached, the brace has a function of bearing both a tensile force and a compressive force, and the dampers are a pair arranged in parallel to each other. Parallel plate portions, a plate-like web portion for energy absorption obtained by connecting the pair of parallel plate portions, and connected to both ends of the pair of parallel plate portions, respectively, and joined to the web portion. A pair of vertical plate portions, and the pair of vertical plate portions respectively constitute the one side surface of the damper and the opposite side surface of the damper, and the web portion is a wall surface of the load-bearing wall. And the position where the edge of the web part in the parallel plate part is connected to the parallel plate part is a cross-sectional mountain shape in which the inclination direction is different between a part in the longitudinal direction and the other part. Since it is away from the edge of the parallel plate portion in the height direction of the chevron formed by the web portion , the number of columns can be reduced, and the degree of freedom in design and the cost can be reduced.

(A) is a front view of the bracing bearing wall structure of the steel building according to the first embodiment of the present invention, and (B) is a schematic diagram of the bracing bearing wall structure. (A) is a front view of a damper incorporated in the load-bearing wall structure using braces, (B) is a broken side view, and (C) is a perspective view. (A) is the front view of the modification of the damper, (B) is the fracture side view, (C) is the perspective view. It is explanatory drawing of stress concentration relaxation in the steel-frame building using the load-bearing wall structure using the brace. It is a front view of the bracing use load-bearing wall structure of the steel structure building concerning other embodiments. It is explanatory drawing which shows each example of the elevation silhouette of the steel-frame building using the bracing use load-bearing wall structure of one of the said embodiments. (A) is a front view of a bracing bearing wall structure of a steel structure building according to still another embodiment of the present invention, and (B) is a schematic diagram of the bracing bearing wall structure. (A) is a front view of a bracing bearing wall structure of a steel structure building according to still another embodiment of the present invention, and (B) is a schematic diagram of the bracing bearing wall structure. (A)-(C) show the schematic of a prior art example, (D) shows the schematic of a proposal example.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a bearing wall of a steel-framed detached house, and FIG. 1B schematically shows the bearing wall 20. The building using the bearing wall 20 may be a building such as an office or a factory.
In this steel building building bearing wall structure using braces, as shown in FIG. 1A, in the steel building having a plurality of or one bearing wall 20 using the brace 24, the braces on any of the bearing walls 20 are used. The upper end of 24 is joined in the vicinity of the joint between the column 21 and the beam 22, and the lower end of the brace 24 is joined to a portion of the RC foundation 10 in which the column base of the column 21 is joined, where no column is built. . The upper end of the brace 24 may be joined to either the column 21 or the beam 22 or to both. The load-bearing wall 20 is composed of frame materials such as the pillars 21, beams 22 and braces 24, and face materials such as exterior surface materials and interior surface materials, but the description of the surface materials is omitted.

  This embodiment exemplifies a case where the steel building is a module-designed building in which pillars 21 are built on an RC foundation 10 at a position that is an integral multiple (including 1) of a module. The lower end of the brace 24 is joined to a place where the pillar 21 is not built at the module position in the RC foundation 10. Specifically, the lower end of the brace 24 is joined to the RC foundation 10 via the damper 1 and the joint hardware 11. The column 21 is joined to the RC foundation 10 by an anchor bolt (not shown) whose column base protrudes from the top end surface of the RC foundation 10, and the joint hardware 11 is similar to the column 21. The lower end is joined to the RC foundation 10 by anchor bolts (not shown) protruding from the top end surface of the ten.

  The damper 1 is configured to have a spindle type hysteresis characteristic, and the brace 24 having a function of bearing both a tensile force and a compressive force and a cross-sectional performance is used. The column 21 is a shape steel such as a square pipe or a lip groove shape steel, the beam 22 is a shape steel such as an H shape steel or a lip groove shape steel, and the brace 24 is a shape steel such as a square pipe or lip groove shape steel. In either case, lightweight steel or heavy steel frame is used.

  The damper 1 is a member that is incorporated in the load bearing wall 20 and absorbs energy applied by an earthquake or the like. In this example, the damper 1 includes a pair of parallel plate portions 2 arranged in parallel with each other as shown in the front view, the cutaway side view, and the perspective view in FIGS. 2, an energy absorbing plate-like web portion 3 for connecting these parallel plate portions 2, and a pair of vertical plate portions 4, 4 respectively connected between both ends of the pair of parallel plate portions 2, 2. . The pair of parallel plate portions 2 and 2 and the vertical plate portions 4 and 4 are made of a flat steel plate such as a strip steel, and the web portion 3 is made of a steel material described later. The parallel plate portions 2, 2 and the web portion 3, and the parallel plate portions 2, 2 and the vertical plate portions 4, 4 are joined by welding such as fillet welding, and both the web portion 3 and the vertical plate portions 4, 4 are corners. Joined by meat welding or the like.

  The pair of vertical plate portions 4 and 4 are respectively joined to an upper portion and a lower portion that are displaced in the opposite directions along the wall surface of the load bearing wall 20 due to vibration. In the bearing wall 20 of this embodiment, the left vertical plate portion 4 in FIG. 2A is joined to the lower end of the brace 24, and the right vertical plate portion 4 is joined to the RC foundation 10 via the joint hardware 11. The

  The web portion 3 of the damper 1 is arranged such that the surface thereof is inclined in the direction of entering and exiting with respect to the wall surface of the load bearing wall 20. That is, in FIG. 2B, the top and bottom of the paper surface corresponds to the top and bottom of the load bearing wall 20, the width direction of the paper surface corresponds to the thickness direction of the load bearing wall 20 (the entrance / exit direction), and the wall surface of the load bearing wall 20 is the paper surface. It is perpendicular to it. Here, a part of the web part 3 in the longitudinal direction is inclined at a predetermined angle with respect to the wall surface of the load bearing wall 20, and the other part of the web part 3 in the longitudinal direction is different from the inclination angle with respect to the wall surface. The cross section is mountain-shaped so as to form an inclination of. In order to make the web portion 3 have a mountain-shaped cross section, the web portion 3 is configured by joining two flat steel plates 13A and 13B such as band steels to each other by fillet welding or the like. Thereby, the whole cross section of the damper 1 is M-shaped. That is, the steel plate 13A that is the upper portion of the web portion 3 is inclined downward with respect to the wall surface, and the steel plate 13B that is the lower portion of the web portion 3 is inclined upward with respect to the wall surface.

  The operation and effect of the damper 1 will be described. The vertical plate portion 4 transmits the load of the steel plates 13A and 13B of the web portion 3. In this damper 1, since the web part 3 has made the inclination of the exit / entry direction with respect to the wall surface of the load-bearing wall 20, high deformability is obtained. Therefore, when using a low-yield-point steel as a material or applying a horizontal load along the wall of the load-bearing wall 20 due to an earthquake or the like without applying a slit or the like to the web portion 3, sufficient deformation capacity is secured. can do.

  FIG. 3 shows a modification of the damper 1. In this example, the web portion 3 of the damper 1 is formed by bending a steel plate such as a strip steel, and the cross-sectional shape thereof is V-shaped as a whole, and the protruding end 3a is arcuate or elliptical. The shape is different. That is, a part of the web part 3 in the longitudinal direction is an inclined part 3A that forms a predetermined angle with respect to the wall surface of the load bearing wall 20, and the other part of the web part 3 in the longitudinal direction is different from the inclination angle with respect to the wall surface. The angled inclined portion 3B is a cross section of the protruding end 3a where the two inclined portions 3A and 3B are attached to each other. Other configurations and operational effects are substantially the same as those of the damper 1 shown in FIG.

  According to the load-bearing wall structure using braces of this steel structure building, the upper end of the brace 24 in one load-bearing wall 20 is joined to the vicinity of the joint between the column 21 and the beam 22 as described above, and the lower end of the brace 24 is joined to the RC structure. Since it is joined to the foundation 10, the reaction force of the brace 24 can be received by the RC foundation 10. Therefore, it is possible to reduce one column 21 in one bearing wall 20, and it is possible to increase the degree of design freedom and reduce the cost. For example, if the column 21 is omitted, an opening such as a large window can be provided at that position. In FIG. 1B, the reduced pillars 21 are indicated by broken lines.

  Further, by reducing the columns 21, it is possible to relieve stress concentration on the RC foundation 10 and the column base joints. For example, as shown in FIG. 4, when the load bearing walls 20 and 20A are arranged in multiple layers over the first floor portion and the second floor portion, the reaction force from the load bearing wall 20A on the second floor is distributed and flows to the left and right pillars. Therefore, as compared with the case where the columns 21 are not reduced, the force acting on the column base portions (portions where the columns are omitted) in the RC foundation 10 in the first-layer load-bearing wall 20 is alleviated. In addition, each arrow in FIG. 4 shows each force which acts on a steel structure building, and the omitted column 21 is shown with the broken line.

FIG. 5 shows a modification of the installation structure of the damper 1 in the load-bearing wall 20 on the first floor using the damper 1. In this example, the upper end of the brace 24 is joined to the pillar 21 in the vicinity of the joint portion between the column 21 and the beam 22 via the joint hardware 12, and the lower end of the brace 24 is joined to the upper joint hardware 11A, the damper 1, and the lower part. It is joined to the RC foundation 10 via the side joining hardware 11B. Specifically, in the damper 1, one vertical plate portion 4 (see FIG. 2) is bonded to the upper bonding hardware 11 </ b> A, and the other vertical plate portion 4 is bonded to the lower bonding hardware 11 </ b> B.
The column 21 is joined to the RC foundation 10 by anchor bolts (not shown) in the same manner as in the embodiment of FIG. 1, and the lower joint hardware 11B is RC-built by anchor bolts (not shown) in the same manner as the columns 21. It is joined to the base 10. The upper metal fitting 11A and the lower end of the brace 24 are joined by welding or the like.

  In addition, when the building using the load-bearing wall 20 of the first floor portion of the figure is applied to a two-story building such as the example of FIG. 4, the load-bearing wall 20A of the second floor portion is the load-bearing wall of the first floor portion. 20 and the brace 24 are arranged in opposite directions, and the lower end of the brace 24 is joined to the beam 22 via, for example, the joint hardware 11A and 11B and the damper 1 similar to the first floor portion.

In addition, according to the bracing bearing wall structure of the steel structure building according to each of the above embodiments, it is possible to reduce the columns 21, so even in the site with the slope 26 as shown in FIGS. 6 (A) and (B), An elevation silhouette that can effectively use the space on the site by inclining the first floor part or the whole of the outer wall surface 101 on the slope 26 side so that a part of the building 100 is located on or close to the slope 26. The steel structure building 100 can be constructed.
Moreover, the steel-frame building of the special standing surface silhouette which has an inclination part in the outer wall surface 101 used as the end face of the building 100 like FIG.6 (C)-(E) can be constructed | assembled. 6C to 6E, the alternate long and short dash line indicates a modification of the outer wall surface 101. FIG. 6C shows an example in which the outer wall surface 101 is inclined so that the upper side protrudes over the first to second floors (the same as the example of FIG. 6B), and the outer wall surface 101 of each floor portion is An example in which each is inclined to the upper recess shape is indicated by a one-dot chain line. FIG. 6D shows an example in which the outer wall surface 101 has an upper-recessed shape in the first floor portion and an upper-projection shape in the second-floor portion. An example of a retracted shape is shown by a one-point solid line. FIG. 6 (E) shows an example in which the outer wall surface 101 has an upper recessed shape over the first floor portion and the second floor portion, and the first floor portion has an upper protruding shape and the second floor portion has an upper recessed shape. An example is shown by a one-dot chain line. In any example of FIG. 6, the outer wall surface follows the inclination of the brace 24.

  In each of the above embodiments, the lower end of the brace 24 is joined to the RC foundation 10 via the damper 1. However, the lower end of the brace 24 may be joined to the RC foundation 10 without the damper 1 interposed. good.

  FIG. 7A shows a front view of a braced bearing wall structure of a steel structure building according to another embodiment of the present invention, and FIG. 7B shows a schematic diagram thereof. The bracing bearing wall structure of this example is a steel building having a plurality of bearing walls 20, the braces 24, 24 of the adjacent bearing walls 20, 20 are inclined in a direction in which the upper sides approach each other, and both braces 24, 24 are used. The two braces 24 are arranged so as to form an inverted V shape by joining the upper ends of the two to the beam 22 through the common joint metal 12. The lower end of each brace 24 is a place where the pillar 21 in the RC foundation 10 is not provided via the joint hardware 11A, 11B and the damper 1, that is, a place where the pillar 21 is not built at the module position in the RC foundation 10 It is joined to. Other configurations are the same as those of the embodiment shown in FIGS.

  In the case of this embodiment, since the two load bearing walls 20, 20 are arranged side by side, the three columns 21, the columns 21 at both ends of the array of the two load bearing walls 20, 20 and the intermediate columns 21, are provided. The pillar 21 can be reduced. Other functions and effects are the same as in the previous embodiment. In FIG. 7B, the columns 21 to be reduced are indicated by broken lines.

  FIG. 8 (A) shows a front view of a load-bearing wall structure using braces of a steel structure building according to still another embodiment of the present invention, and FIG. 8 (B) shows a schematic diagram thereof. The braced bearing wall structure of this example is a steel building having a plurality of bearing walls 20, and the upper ends of the braces 24 constituting the adjacent bearing walls 20, 20 are columns on the sides of the bearing walls 20 that are not adjacent to each other. The two braces 24 are arranged so as to form a V shape by being joined to the column 21 or the beam 22 at the joint between the beam 21 and the beam 22, respectively. The lower end of each brace 24 is located at a location where there is no column 21 in the RC foundation 10 via the upper joining hardware 11A, 11A, the dampers 1, 1 and the lower joining hardware 11B, that is, the module position in the RC construction 10 In this case, the column 21 is joined to a place where it is not built. The lower metal fitting 11 </ b> B is a common metal fitting for the two braces 24. Other configurations are the same as those of the embodiment shown in FIGS.

  In the case of this embodiment, when the horizontal force acts on the load bearing wall 20, the lower joint metal 11 </ b> B used in common for the two braces 24 is opposite to each other with respect to the vertical force from the braces 22 on both sides. Since the force acts and cancels out, it is possible to have a shape that can resist only the shear of the column base. In the case of this embodiment, one intermediate pillar 21 can be reduced in constructing the two load bearing walls 20, 20 arranged side by side. Other functions and effects are the same as in the previous embodiment. In FIG. 8B, the columns 21 to be reduced are indicated by broken lines.

DESCRIPTION OF SYMBOLS 1 ... Damper 10 ... RC foundation 20 ... Bearing wall 21 ... Pillar 22 ... Beam 24 ... Brace 100 ... Building 101 ... Outer wall surface

Claims (2)

In a steel structure building with multiple or one bearing wall using braces,
The upper end of the brace in any one of the bearing walls is joined to the vicinity of the joint between the column and the beam or to the beam, and on the side of the joint hardware where the lower end is joined to the portion where the column is not built in the RC foundation, One side of a hysteresis damper is attached, and the lower end of the brace is joined to the side opposite to the one side attached to the joint metal fitting of the damper, and the brace has both tensile force and compressive force. The damper has a function to bear, and the damper includes a pair of parallel plate portions arranged in parallel to each other, a plate-like web portion for energy absorption obtained by connecting the pair of parallel plate portions, and the pair of parallel plate portions. A pair of vertical plate portions that are respectively connected between both ends and joined to the web portion, and the pair of vertical plate portions are respectively the one side surface of the damper and the opposite side of the damper. The web portion is inclined with respect to the wall surface of the load-bearing wall and the parallel plate portion, and has a cross-sectional mountain shape in which the inclination direction is different between a part in the longitudinal direction and the other part, and A bracing bearing wall structure of a steel building in which a position where an edge of the web part in the board part is connected is separated from an edge of the parallel plate part in a height direction of the mountain shape formed by the web part .   The braced bearing wall structure of the steel structure building according to claim 1, wherein the steel structure building is a modular design building in which pillars are built at integer multiple positions including one time of the module on the RC structure foundation. A bracing bearing wall structure of a steel building in which the lower end of the brace is joined to a place where the pillar is not built at a module position in an RC foundation.

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