JP5603741B2 - Buckling restraint brace - Google Patents

Description

  The present invention relates to a buckling restrained brace.

  Conventionally known as a buckling-restrained brace 10 is Patent Document 1 or the like.

  As shown in FIGS. 9 and 10, the buckling-restraining brace 10 disclosed in Patent Document 1 includes a first buckling-restraining member 2 made of a long square metal tube on a long brace core 1. A long second buckling restraining member 3 is interposed between the outer surface of the brace core material 1 and the inner surface of the first buckling restraining member 2 while being externally fitted.

  Both end portions in the longitudinal direction of the brace core material 1 protrude from both longitudinal end portions of the first buckling restraining member 2 and the second buckling restraining member 3, and the longitudinal direction of the brace core material 1 The projecting portions at both ends serve as connection portions 4 for connecting to building structural members.

  The second buckling restraining member 3 has a cross-sectional groove shape, and a pair of opposing ones of both outer surfaces of the plate-like brace core 1 and two opposing inner surfaces of the first buckling restraining member 2. The second buckling restraining members 3 are interposed between the inner surfaces of the two members.

The webs 8 of the respective second buckling restraining members 3 face the both outer surfaces of the plate-like brace core material 1, and the front ends of the flanges 7 of the respective second buckling restraining members 3 are respectively the first buckling restraining. It faces a pair of opposed inner surfaces of the member 2 .
The first buckling restraining member 2 made of a rectangular metal cylinder has a deformed portion 20 that is deformed inward by the applied pressure from the outside toward the brace core material 1, and the deformed portion 20 allows the first buckling restricting member 2 to be The buckling restraining member 2 is pressed against the brace core 1 via the second buckling restraining member 3.

  That is, the inner surface of the deformed portion 20 of the first buckling restraining member 2 and the tip of the flange 7 of the second buckling restraining member 3 are in pressure contact, and the web 8 and the plate of the second buckling restraining member 3 are pressed. The members are connected to each other by being in pressure contact with the outer surface of the brace core material 1 having a shape.

  Here, since the press contact by the deforming portion 20 is performed by plastic deformation of the metal, expansion and contraction of the brace core material 1 is allowed.

  The buckling-restrained brace 10 having the above-described structure connects the connecting portions 4 at both ends in the longitudinal direction of the brace core 1 to building structural members (bearing wall frames, columns, beams, etc.), and the structure of the building during an earthquake or the like. A horizontal force acting on the member is supported by the brace core material 1.

  When the compressive stress is applied to the brace core material 1, buckling that tends to occur in the brace core material 1 is restrained by the first buckling restraining member 2 and the second buckling restraining member 3.

JP 2008-75281 A

  However, since Patent Document 1 is a member in which members are connected by pressure welding due to plastic deformation of metal, the second buckling restraining member 3 and the brace are subjected to repeated stress acting on the buckling restraining brace 10 during an earthquake or the like. There is a possibility that the pressure contact with the core material 1 and the pressure contact between the first buckling restraining member 2 and the second buckling restraining member 3 may be loosened.

  The buckling-restraining brace 10 is generally used when constructing a bearing wall. For this reason, in the construction state, the long buckling-restraining brace 10 is disposed obliquely as an oblique material in the wall. .

  Therefore, when a repeated stress acts and the pressure contact between the second buckling restraining member 3 and the brace core material 1 and the pressure welding between the first buckling restraining member 2 and the second buckling restraining member 3 are loosened, As shown in FIG. 11, the first buckling restraining member 2 and the second buckling restraining member 3 are shifted obliquely downward with respect to the brace core material 1 by its own weight, and the upper portion of the brace core material 1 is restrained in FIG. 11. This causes a problem in quality of the buckling restrained brace 10.

  In addition, the buckling restraint brace 10 is assembled and formed at the factory, and then incorporated as a diagonal member when the load bearing wall frame to be a structural member of the building is formed at the factory, or the buckling restraint brace 10 is transported to the site. Connect to pillars, beams, etc., which are structural members that make up the bearing wall of the building.

  However, when the buckling constraining brace 10 is incorporated as a diagonal material in a load-bearing wall frame or when it is transported to the construction site, an external force acts on the buckling constraining brace 10 to loosen the pressure connection connecting the members. 11, the first buckling restraining member 2 and the second buckling restraining member 3 move with respect to the brace core material 1, and the connecting portion 4 at the end of the brace core material 1. May be covered.

  In such a case, all or a part of the connection part 4 is covered, so that it is difficult to connect the connection part 4 to the structural member and the quality is not stable.

  The present invention has been invented in view of the above-described conventional problems, and even when repeated stress is applied, the buckling restraint of the brace core material can be stabilized and the connection work at the connection portion can be performed without any problem. In providing restraint braces.

The buckling-restraining brace of the present invention has a long plate-like brace core material 1 having connection portions 4 for connection to structural members of a building at both ends in the longitudinal direction, and substantially the longitudinal direction of the brace core material 1. Between the first buckling restraining member 2 made of a long rectangular metal tube that fits the entire length, and the outer surface of the plate-like brace core 1 and the inner surface of the first buckling restraining member 2. A long second buckling restraining member 3 interposed over the entire length in the longitudinal direction, and a substantially central portion of the brace core 1 in the longitudinal direction and the longitudinal direction of the second buckling restraining member 3. The brace core material 1 and the second buckling restraining member 3 are relatively movable except for the sticking portion 5, and the length of the first buckling restraining member 2 is fixed. and longitudinal end of the the direction of the one end the second buckling restraint member 3 is fixed, the vibration The connecting portions 4 at both ends in the longitudinal direction of the core material 1 protrude from both longitudinal ends of the first buckling restraining member 2 and the second buckling restraining member 3. .

The buckling-restraining brace of the present invention has a long plate-like brace core material 1 having connection portions 4 for connection to structural members of a building at both ends in the longitudinal direction, and substantially the longitudinal direction of the brace core material 1. Between the first buckling restraining member 2 made of a long rectangular metal tube that fits the entire length, and the outer surface of the plate-like brace core 1 and the inner surface of the first buckling restraining member 2. A long second buckling restraining member 3 interposed over the entire length in the longitudinal direction, and the brace core material 1 and the second buckling restraining member 3 are fixed in a part of each longitudinal direction. In addition, the brace core material 1 and the second buckling restraining member 3 are relatively movable except for the fixing portion 5 in a part in the longitudinal direction, and the first buckling restraining member 2 and the first buckling restraining member 3 are relatively movable. 2 buckling restraining members 3 are fixed in a part of each longitudinal direction, Brace core 1 a longitudinal direction of which the connecting part 4 of the end portions projected from both ends of the first buckling restraint member 2 and the second longitudinal buckling restraint member 3, the second buckling restraint member 3 is a cross-sectional groove shape, the plate-shaped both the outer surface of the brace core 1, wherein the tip portion of the flanges 7 of both the second buckling restraint member 3 are opposed respectively, wherein each web 8 of both the second buckling restraint member 3, a pair of respectively opposite the inner surface, the second buckling restraint member of said first buckling restraint member 2 of the two opposing pairs of the inner surface 3 protrudes from one end in the longitudinal direction of the first buckling restraining member 2, and the outer surface of the web 8 at the projecting end of the second buckling restraining member 3 and the first buckling. The end side 9 of the restraining member 2 is welded .

  The present invention supports the horizontal force acting on the structural member of the building during an earthquake or the like by the brace core material, and when compressive stress is applied to the brace core material, buckling that tends to occur in the brace core material, It can restrain with the 1st buckling restraint member and the 2nd buckling restraint member. In addition, even when repeated stress is applied, the buckling restraint of the brace core can be stabilized. Moreover, the required protrusion length from the both ends of the 1st buckling restraining member and the 2nd buckling restraining member of the connection part of the longitudinal direction both ends of a brace core material can be ensured, and the connection operation in a connection part is possible. It can be done without any problem.

It is the perspective view which fractured | ruptured partially of one Embodiment of the buckling restraint brace of this invention. It is sectional drawing of the AA line of FIG. 1 same as the above. It is an expanded sectional view of the BB line of FIG. 1 same as the above. It is an expanded sectional view of the CC line of FIG. 1 same as the above. The perspective view for description which shows the state before attaching what fixed the center part of the longitudinal direction of the brace core material same as the above and the center part of the longitudinal direction of the 2nd buckling restraint member to the 1st buckling restraint member. FIG. The other embodiment of the buckling restraint member of this invention is shown, (a) is the perspective view which fractured | ruptured partially, (b) is sectional drawing of the DD line | wire of (a). The further embodiment of the buckling restraining member of this invention is shown, (a) is the perspective view which fractured | ruptured partially, (b) is sectional drawing of the EE line | wire of (a). The further embodiment of the buckling restraint member of this invention is shown, (a) is the perspective view which fractured | ruptured partially, (b) is sectional drawing of the FF line | wire of (a). It is the partially broken perspective view which shows a prior art example. It is sectional drawing of a prior art example. It is a schematic explanatory drawing which shows the example which the 1st buckling restraint member and the 2nd buckling restraint member moved with respect to the brace core material in the conventional example.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The buckling restraint brace 10 is configured by combining a long brace core material 1, a long first buckling restraint member 2, and a long second buckling restraint member 3.

  The long brace core 1 has a long plate shape, and both end portions in the longitudinal direction serve as connection portions 4 for connection to building structural members (bearing wall frames, columns, beams, etc.). , Carbon steel, stainless steel, alloy steel, etc. are used. However, the present invention is not necessarily limited thereto, and other various materials (for example, aluminum) may be used.

  The first buckling restraining member 2 has a rectangular tube shape and is fitted over the entire length of the brace core 1 in the longitudinal direction, and is a square steel pipe such as carbon steel, stainless steel, alloy steel, or the like. It consists of a square metal tube made of other materials.

  The second buckling restraining member 3 has a cross-sectional groove shape and is interposed between the outer surface of the brace core material 1 and the inner surface of the first buckling restraining member 2 over the entire length in the longitudinal direction. , Carbon steel, stainless steel, alloy steel, etc. are used. However, the present invention is not necessarily limited thereto, and other various materials (for example, aluminum) may be used.

  The brace core material 1 and the second buckling restraining member 3 are fixed in a part of each longitudinal direction, and the brace core material 1 and the second buckling member except for the fixed part 5 in a part of the longitudinal direction. The restraining member 3 is relatively movable.

  Moreover, the 1st buckling restraint member 2 and the 2nd buckling restraint member 3 are fixed in a part of each longitudinal direction.

  Moreover, the connection part 4 of the longitudinal direction both ends of the brace core material 1 protrudes from the longitudinal direction both ends of the 1st buckling restraint member 2 and the 2nd buckling restraint member 3 in the combined state.

  One embodiment based on the above basic configuration is shown in FIGS.

  In the embodiment shown in FIG. 1 to FIG. 5, a pair of opposed inner surfaces of two opposed inner surfaces of the first buckling restraining member 2 made of a rectangular metal tube, and a long plate-like brace core material A second buckling restraining member 3 is interposed between both outer surfaces of 1.

  In this embodiment, the front ends of both flanges 7 of the second buckling restraining members 3 face the outer surfaces of the long plate-like brace core material 1, and the webs of both second buckling restraining members 3 8 is interposed so as to be opposed to a pair of opposed inner surfaces of the first buckling restraining member 2.

  The long plate-like brace core 1 and the two long second buckling restraining members 3 are fixed to each other only at a substantially central portion in the longitudinal direction by welding as shown in FIGS. The fixing portion 5 is formed, and the portions other than the fixing portion 5 are relatively fixed without being fixed as shown in FIG.

  At the time of fixation, a corner portion formed by a substantially central portion in the longitudinal direction of the outer surface of the long plate-like brace core 1 and a substantially central portion in the longitudinal direction of the outer surface of the flange 7 of the second buckling restraining member 2 is used. Weld both.

  In this case, as shown in FIGS. 2, 3, and 5, the outer surface of the brace core 1 and the outer surface of the flange 7 of the second buckling restraining member 2 are sufficient at the corner portion formed by the surfaces. Since the welding length can be secured and both can be welded, the welding workability is improved, and further, the strength and quality can be secured.

  When the second buckling restraining member 3 is shorter than the brace core material 1 and is fixed at the center in the longitudinal direction as described above, the connecting portions 4 at both ends of the brace core material 1 are the second buckling restraining member. 3 protrudes from both ends in the longitudinal direction.

  As described above, the substantially central portions in the longitudinal direction of the second buckling restraining members 2 on both sides are fixed to the substantially central portions in the longitudinal direction of both outer surfaces of the long plate-like brace core material 1 by welding, It inserts from the opening of the one end part of the longitudinal direction of the 1st buckling restraint member 2 which consists of a square metal cylinder like FIG.

  The connecting portions 4 at both ends in the longitudinal direction of the brace core material 1 protrude from both ends in the longitudinal direction of the first buckling restraining member 2 made of a square metal tube.

  The first buckling restraining member 2 is slightly shorter than the second buckling restraining member 3, and one end portion or both end portions of the second buckling restraining member 3 in the longitudinal direction of the first buckling restraining member 2. It protrudes from one end or both ends in the longitudinal direction.

  A portion protruding from one longitudinal end portion of the first buckling restraining member 2 at one longitudinal end portion of the second buckling restraining member 3 is used as one longitudinal end portion of the first buckling restraining member 2. The fixing portion 6 is formed by fixing by welding.

  In fixing, the corner portion formed by the outer surface of the web 8 at the protruding end portion of the second buckling restraining member 3 and the end portion 9 of the first buckling restraining member 2 is welded along the end portion 9. .

  In this case, as shown in FIGS. 1 and 2, at the corner portion formed by the outer surface of the web 8 at the protruding end portion of the second buckling restraining member 3 and the end side portion 9 of the first buckling restraining member 2. Since a sufficient weld length can be secured along the end side portion 9 and both can be welded, the welding workability is improved, and further, the weld can be welded without any defects such as melting of the base material, and the strength and quality can be secured.

  Note that the web 8 of the second buckling restraining member 3 faces the outer surface of the long plate-like brace core 1, and the front end portion of the flange 7 of the second buckling restraining member 3 is the first buckling restraint. It is also conceivable to interpose the member 2 so as to face a pair of opposed inner surfaces. In this case, the tip end of the flange 7 and the end side portion 9 of the first buckling restraining member 2 orthogonal to the flange 7 are substantially spot-welded, so that the weld length cannot be secured and the welding workability is poor. In addition, the welding strength is reduced, and the welded portions are concentrated at approximately one point, so that there is a possibility that a defect such as melting of the base metal may occur. On the other hand, in the present embodiment, the integrity as the restraining material, that is, the buckling restraining force is increased, and the quality can be ensured.

  In this way, the brace core material 1 and the second buckling restraining member 3 are fixed only at the center in the longitudinal direction, and the first buckling restraining member 2 and the second buckling restraining member 3 are long. The buckling restraint brace 10 is assembled and formed by fixing only at one end in the direction.

  The assembled and formed buckling restraint brace 10 fixes the brace core material 1 and the second buckling restraint member 3 only at the central portion in the longitudinal direction, so that the fixing portion 5 (welded portion) at the central portion in the longitudinal direction. In other cases, the brace core material 1 and the second buckling restraining member 3 are relatively movable.

  For this reason, even if expansion / contraction deformation occurs, the protruding length from one end portion of the second buckling restraining member 3 in the longitudinal direction of one end portion of the brace core material 1 and the second length of the other end portion of the brace core material 1. The protrusion length from the other end part of the longitudinal direction of the buckling restraining member 3 becomes the same.

  The buckling restrained brace 10 having the above configuration connects the connection portions 4 at both ends in the longitudinal direction of the brace core 1 to building structural members (bearing wall frames, columns, beams, etc.).

  For example, the buckling-restrained brace 10 is assembled at a factory as a diagonal material of a load-bearing wall frame to be a structural member of a building, and the load-bearing wall frame incorporating the buckling-restraining brace 10 is transported to the site and built as a structural member of the building. Include.

  Alternatively, the buckling restrained brace 10 is transported to the site and connected to a pillar or beam, which is a structural member of the building, on the site.

  In any case, the connecting part 4 of the brace core 1 protruding from both ends in the longitudinal direction of the buckling-restraining brace 10 is connected to the load-bearing wall frame at the factory by welding, bolts, etc. Connect to the beam with welding or bolts.

  Here, when the buckling restraint brace 10 is connected to the structural member of the building or during transport, the second buckling restraint member 3 is moved in the longitudinal direction relative to the buckling restraint brace 10 or the second seat. There is a case where an external force for moving the first buckling restraining member 2 acts on the bending restraining member 3.

  However, the brace core material 1 and the second buckling restraining member 3 are fixed in part in the longitudinal direction, and the first buckling restraining member 2 and the second buckling restraining member 3 are secured in part in the longitudinal direction. Therefore, the first buckling restraint member 2 and the second buckling restraint member 3 as a whole do not move to one end side in the longitudinal direction with respect to the brace core material 1, and the first buckling restraint. There is no situation where the member 2 and the second buckling restraining member 3 cover the connecting portion 4 at the end in the longitudinal direction of the brace core material 1.

  Therefore, the connecting portion 4 at the end portion in the longitudinal direction of the brace core 1 always protrudes from the end portions in the longitudinal direction of the first buckling restraining member 2 and the second buckling restraining member 3 to the length necessary for connection. It is possible to maintain this state, and there is no hindrance in connection work with the structural member of the building, and the connection work can be easily performed.

  As described above, the buckling restrained brace 10 is attached by connecting the connecting portions 4 at both ends in the longitudinal direction of the brace core material 1 to structural members (bearing wall frames, columns, beams, etc.) of the building.

  The buckling restrained brace 10 attached to the structural member of the building in this way can support the horizontal force acting on the structural member of the building during an earthquake or the like by the brace core material 1.

  When the compressive stress is applied to the brace core material 1, the buckling that tends to occur in the brace core material 1 is constrained by the first buckling restraining member 2 and the second buckling restraining member 3 in cooperation. be able to.

  In the brace core material 1, since the second buckling restraining member 3 is fixed only in a part in the longitudinal direction, the restraining member (the second buckling restraining member 3, the first buckling restraining member) at the time of an earthquake. The brace core material 1 can be expanded and contracted without being affected by 2).

  Further, as in the present embodiment, the longitudinal center portion of the brace core material 1 and the second buckling restraining member 3 adhere to the longitudinal center portion so that both end portions of the place core material 1 in the longitudinal direction are fixed. Compared to the case where the contraction allowance (the connection portion 4 exists within the range of the contraction allowance) that protrudes from both ends in the longitudinal direction of the second buckling restraining member 3 is fixed at a portion other than the central portion. Can be shortened. The shorter the shrinkage, the more stable the structural strength performance at the time of earthquake.

  In addition, since the brace core material 1 and the second buckling restraining member 3 are fixed in a part of the longitudinal direction and relatively movable except for the fixing part 5, a repeated stress is applied to the buckling restraining brace 10 during an earthquake. When this occurs, the second buckling restraining member 3 and the first buckling restraining member 2 do not move in the longitudinal direction as a whole with respect to the brace core material 1.

  Here, in Patent Document 1, as described above, the second buckling restraining member 3 and the first buckling restraining member 2 are displaced as a whole with respect to the brace core material 1 due to repeated stress. If it moves diagonally downward, the region that is not restrained by the restraining member at one end portion (oblique upper end portion) in the longitudinal direction of the brace core 1 may be enlarged, and there may be a problem in quality of the buckling restraint brace 10, In this embodiment, there is no such a fear and buckling restraint performance does not fall.

  In this embodiment, since both flanges 7 of the second buckling restraining member 3 having a groove-shaped cross section are opposed to the outer surface of the brace core material 1, the brace core material 1 and the second buckling restraining member 3 are opposed to each other. The contact area is small and the elastic deformation is performed smoothly.

  Further, since only the vicinity of both ends in the width direction of the brace core material 1 is restrained by the flange 7 of the second buckling restraint member 3, the second buckling restraint member 3 restrains almost the entire width of the outer surface of the brace core material 1. Without being done, when a compressive force is applied to the brace core material 1, the brace core material 1 can be allowed to wave to some extent to relieve stress.

  Thereby, while this embodiment can prevent local buckling of the brace core material 1, excessive stress does not act on a restraining member (the 2nd buckling restraining member 3, the 1st buckling restraining member 2). The independence of the behavior of the brace core material 1 and the second buckling restraining member 3 can be enhanced while ensuring a high buckling restraining force.

  Further, in the present embodiment, the web 8 of the second buckling restraining member 3 faces the inner surface of the first buckling restraining member 2. With this configuration, the stress transmitted from the brace core 1 to both flanges 7 of the second buckling restraining member 3 is applied from the web 8 of the second buckling restraining member 3 to the side surface of the first buckling restraining member 2. Will be communicated.

  Accordingly, the stress from the second buckling restraining member 3 is transmitted from the web 8 to the side of the first buckling restraining member 2 in a distributed manner from the surface to the surface, reducing stress concentration and stress concentration. Thus, local deformation of the first buckling restraining member 2 due to can be prevented, and the buckling restraining force can be improved.

  FIG. 4 shows a dimensional relationship among the brace core material 1, the first buckling restraining member 2, and the second buckling restraining member 3.

  In FIG. 4, t indicates the thickness dimension of the brace core material 1. a indicates the width of the brace core material 1. b indicates the dimension between the outer surfaces of the flanges 7 of the second buckling restraining member 3. c shows the dimension of the space | interval between a pair of opposing inner surface parallel to the flange 7 among the two pairs of opposing inner surfaces which the 1st buckling restraining member 2 opposes. d shows the dimension of the space | interval between another pair of opposing inner surfaces parallel to the web 8 among two opposing inner surfaces of the 1st buckling restraining member 2 which opposes. e indicates the dimension from the outer surface of the web 8 of the second buckling restraining member 3 to the tip of the flange 7. In FIG. 4, f = (ab) / 2, g = (cb) / 2, and h = (d-2e-t) / 2.

  In the present embodiment, the dimensional relationship is such that t> 2h is satisfied, so that even when the brace core material 1 is deformed out of plane within the first buckling restraint member 2, the shaft core (axis The force acting position is within the cross section of the brace core material 1 (that is, excessive out-of-plane bending of the brace core material 1 is prevented during buckling). As an example, t = 3.2 mm or t = 4.5 mm and h = 1 mm.

  Further, in the present embodiment, the dimensional relationship satisfies f ≧ ca, so that even when the brace core material 1 is deformed in-plane within the first buckling restraining member 2, the brace The core material 1 is prevented from coming off from the restraining region of the second buckling restraining member 3. As an example, f = 3.5 mm and c−a = 1.2 mm.

  By the way, the buckling restrained brace 10 of the present invention is not limited to that of the above embodiment.

  That is, in the buckling restrained brace 10 of the present invention, the brace core material 1 and the second buckling restraining member 3 are fixed in a part of each longitudinal direction and other than the fixing part 5 in a part of the longitudinal direction. The brace core material 1 and the second buckling restraining member 3 are relatively movable, and the first buckling restraining member 2 and the second buckling restraining member 3 are fixed in a part of their longitudinal directions. The connecting portions 4 at both ends in the longitudinal direction of the brace core 1 may be configured to protrude from both ends in the longitudinal direction of the first buckling restraining member 2 and the second buckling restraining member 3.

  FIG. 6 shows another embodiment of the buckling restrained brace 10.

  In the present embodiment, the webs 8 of the second buckling restraining members 3 face the outer surfaces of the brace core material 1 having a long plate shape, and the front ends of both flanges 7 of the second buckling restraining members 3 are used. Is different from the above-described embodiment, but the basic structure of the invention described in claim 1 of the present invention It has.

  That is, also in the present embodiment, the brace core material 1 and the second buckling restraining member 3 are fixed in a part of each longitudinal direction, and the brace core is provided except for the fixed part 5 in a part of the longitudinal direction. The material 1 and the second buckling restraining member 3 are relatively movable. Moreover, the 1st buckling restraining member 2 and the said 2nd buckling restraining member 3 are adhering in a part of each longitudinal direction. Connection portions 4 at both ends in the longitudinal direction of the brace core material 1 protrude from both ends in the longitudinal direction of the first buckling restraining member 2 and the second buckling restraining member 3. Further, the substantially central portion in the longitudinal direction of the brace core material 1 and the substantially central portion in the longitudinal direction of the second buckling restraining member 3 are fixed, and one end portion in the longitudinal direction of the first buckling restraining member 2 and the second portion. One end of the buckling restraining member 3 in the longitudinal direction is fixed.

  In the present embodiment, the end 9 in the longitudinal direction of the first buckling restraining member 2 and the front end of the flange 7 at the end in the longitudinal direction of the second buckling restraining member 3 are welded. Therefore, although it is slightly inferior in welding performance and welding strength as compared with the above-described embodiment, as described above, the basic configuration of the present invention is provided as in the above-described embodiment. The basic effects obtained from the common configuration can be similarly achieved.

  That is, also in the embodiment of FIG. 6, when the horizontal force acting on the structural member of the building during an earthquake or the like is supported by the brace core material 1, and the compressive stress is applied to the brace core material 1, the brace core material 1. The buckling that tends to occur can be restrained by the first buckling restraining member 2 and the second buckling restraining member 3. Moreover, even if a repeated stress acts, the buckling of the brace core material 1 can be stably restrained. Moreover, the required protrusion length from the both ends of the 1st buckling restraining member 2 and the 2nd buckling restraining member 3 of the connection part 4 of the longitudinal direction both ends of the brace core material 1 can be ensured, and a connection part 4 can be connected without any trouble.

  7 and 8 show other embodiments of the buckling restrained brace 10, respectively.

  In each of the above-described embodiments, the second buckling restraining member 3 is interposed between both outer surfaces of the plate-like brace core material 1 and a pair of opposing inner surfaces of the first buckling restraining member 2. Although shown (that is, two second buckling restraining members 3 are provided), each of the embodiments shown in FIGS. 7 and 8 has one outer surface of the plate-shaped brace core 1 and the first buckling restraining member 2. This is an example in which one second buckling restraining member 3 is interposed between one inner surface and the other inner surface. 7 and 8 also, the basic configuration of the plate-like brace core material 1, the first buckling restraining member 2, and the second buckling restraining member 3 and the fixing of the members to each other. Since the relationship is the same as that of the above-described embodiment, a duplicate description is omitted.

  Each of the embodiments shown in FIGS. 7 and 8 also supports the horizontal force acting on the structural member of the building in the event of an earthquake or the like by the brace core material 1 and when the brace core material 1 is subjected to compressive stress, The buckling that tends to occur in the core material 1 can be restrained by the first buckling restraining member 2 and the second buckling restraining member 3. Moreover, even if a repeated stress acts, the buckling of the brace core material 1 can be stably restrained. Moreover, the required protrusion length from the both ends of the 1st buckling restraining member 2 and the 2nd buckling restraining member 3 of the connection part 4 of the longitudinal direction both ends of the brace core material 1 can be ensured, and a connection part 4 can be connected without any trouble.

  Moreover, in each of the above-described embodiments, the brace core material 1 and the second buckling restraining member 3 are fixed only at the substantially central portion in the longitudinal direction. Of course, it may be fixed only at an arbitrary part in the longitudinal direction other than the central part.

  Further, in each of the above-described embodiments, the example in which the first buckling restraining member 2 and the second buckling restraining member 3 are fixed only at one end in the longitudinal direction is shown. Of course, it may be fixed only at an arbitrary part in the longitudinal direction other than one end in the longitudinal direction.

DESCRIPTION OF SYMBOLS 1 Brace core material 2 1st buckling restraint member 3 2nd buckling restraint member 4 Connection part 5 Adhering part 6 Adhering part 7 Flange 8 Web 9 End edge part

Claims (2)

A long-plate-shaped brace core material having connecting portions for connecting to the structural members of the building at both ends in the longitudinal direction;
A first buckling restraining member made of a long rectangular metal tube that is fitted over substantially the entire length of the brace core in the longitudinal direction;
A long second buckling restraining member interposed between the outer surface of the plate-shaped brace core and the inner surface of the first buckling restraining member over the entire length in the longitudinal direction;
The substantially central portion in the longitudinal direction of the brace core and the substantially central portion in the longitudinal direction of the second buckling restraining member are fixed, and the brace core and the second buckling are other than the fixed portion. The restraining member becomes relatively movable,
One end of the first buckling restraining member in the longitudinal direction and one end of the second buckling restraining member in the longitudinal direction are fixed,
The buckling restraint characterized in that the connecting portions at both ends in the longitudinal direction of the brace core member protrude from both longitudinal ends of the first buckling restraining member and the second buckling restraining member. Braces. A long-plate-shaped brace core material having connecting portions for connecting to the structural members of the building at both ends in the longitudinal direction;
A first buckling restraining member made of a long rectangular metal tube that is fitted over substantially the entire length of the brace core in the longitudinal direction;
A long second buckling restraining member interposed between the outer surface of the plate-shaped brace core and the inner surface of the first buckling restraining member over the entire length in the longitudinal direction;
The brace core material and the second buckling restraining member are fixed in a part of each longitudinal direction, and the brace core material and the second buckling restraint are other than a fixing part in a part of the longitudinal direction. The member becomes relatively movable,
The first buckling restraining member and the second buckling restraining member are fixed in a part of each longitudinal direction,
The connecting portions at both ends in the longitudinal direction of the brace core member protrude from both longitudinal ends of the first buckling restraining member and the second buckling restraining member;
The second buckling restraint member sectional groove shape, on both outer surfaces of the plate-shaped bracing core, wherein both the second buckling of the flanges of the restraining member tip respectively opposed Then both the each web of both the second buckling restraint member, respectively opposed to the pair of the inner surface of the inner face of the two pairs of opposing first buckling restraint member,
One end portion in the longitudinal direction of the second buckling restraining member protrudes from one end portion in the longitudinal direction of the first buckling restraining member, and the outer surface of the web at the projecting end portion of the second buckling restraining member A buckling restraint brace, characterized in that an end side portion of one buckling restraint member is welded .

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