JP5568045B2 - Buckling restraint brace - Google Patents

Description

  The present invention relates to a buckling restrained brace.

  Conventionally, Patent Document 1 is known as a buckling restrained brace.

  The buckling restraint brace disclosed in Patent Document 1 has a first buckling restraint member made of a long rectangular metal tube fitted on a long plate-like brace core material, and an outer surface of the brace core material. A long second buckling restraining member is interposed between the inner surface of one buckling restraining member.

  Both end portions in the longitudinal direction of the brace core member protrude from both longitudinal end portions of the first buckling restraining member and the second buckling restraining member, and projecting from both end portions in the longitudinal direction of the brace core member. This part becomes the connection part for connecting to the structural material of the building.

JP 2008-75281 A

  However, in Patent Document 1, since the connecting portions at both ends of the long plate-like brace core member protrude from both longitudinal ends of the first buckling restraining member and the second buckling restraining member, The strength of the part is low and there is room for improvement.

  This invention is invented in view of said point, and exists in providing the buckling restraint brace which can reinforce the both ends of a brace core material effectively.

  The buckling restrained brace of the present invention includes a long plate-shaped brace core material 1 and a long rectangular metal tube that is externally fitted to substantially the entire length excluding both longitudinal ends of the brace core material 1. A long second seat interposed between the outer surface of the plate-like brace core 1 and the inner surface of the first buckling restraining member 2 over the entire length in the longitudinal direction. The second buckling restraining member 3 has a cross-sectional groove shape, and the groove 11 opens to the brace core material 1 side, and the brace core material 1 and the second restraint member 3 are provided. The buckling restraining member 3 is fixed in a part in each longitudinal direction, and the brace core material 1 and the second buckling restraining member 3 are relatively apart from the fixing part 5 in a part in the longitudinal direction. The first buckling restraining member 2 and the second buckling restraining member 3 become movable. The both ends in the longitudinal direction of the brace core material 1 are fixed at a part of the longitudinal direction of the brace core 1 from the longitudinal ends of the first buckling restraining member 2 and the second buckling restraining member 3. Reinforcing members 12 projecting from and connected to the structural material 15 of the building, and connecting the constraining portions 13 from one end in the longitudinal direction to the both ends of the brace core 1, are provided outside the groove 11. The constraining portion 13 is provided so as to be located in the groove 11 over the groove 11, and the reinforcing member 12 is fixed to the brace core material 1 outside the groove 11 and in the groove 11. The restraint portion 13 is not fixed to the brace core material 1.

  Further, the portion of the restraining portion 13 that faces the brace core material 1 can be inclined so as to move away from the brace core material 1 toward the forefront of the restraining portion 13.

  Further, the reinforcing members 12 that are elongated in the direction along the longitudinal direction of the brace core material 1 can be provided on both surfaces of both ends in the longitudinal direction of the long plate-shaped brace core material 1.

  The present invention can effectively reinforce both ends of the brace core, and supports the horizontal force acting on the structural material of the building during an earthquake or the like by the brace core and compresses it into the brace core. When stress is applied, it is possible to restrain the buckling of the brace core material.

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. It is an expanded sectional view of the DD line of FIG. 1 same as the above. It is an expanded sectional view of the EE line of FIG. 1 same as the above. It is an expanded sectional view of the FF line of FIG. 1 same as the above. It is an expanded sectional view of the GG 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. It is a perspective view which shows an example of the part which connected the buckling restraint brace same as the above to a structural material. It is sectional drawing same as the above. It is sectional drawing of other embodiment of the buckling restraint brace of this invention. FIG. 6 is a partially broken perspective view of still another embodiment of the buckling restrained brace of the present invention. It is sectional drawing of the HH line of FIG. 13 same as the above. It is sectional drawing of the II line | wire of FIG. 13 same as the above. It is sectional drawing of the JJ line of FIG. 13 same as the above. It is sectional drawing of the KK line | wire of FIG. 13 same as the above. It is sectional drawing of the LL line of FIG. 13 same as the above. It is sectional drawing of the MM line | wire of FIG. 13 same as the above.

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

  1 to 9 show an embodiment of the buckling restrained brace 1 of the present invention, FIGS. 10 and 11 show the connection of the buckling restrained brace 1 to the structural member 15, and FIG. Another embodiment of the restraint brace 1 is shown, and FIGS. 13 to 19 show still another embodiment of the buckling restraint brace 1. FIG.

  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 material 1 has a long plate shape and is formed of steel such as carbon steel, stainless steel, alloy steel, but is not necessarily limited to this, and other various materials (for example, , Aluminum, etc.).

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

  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 second buckling restraining member 3 having a groove shape in cross section is arranged and fixed so that the groove 11 opens to the plate surface side of the brace core material 1.

  Here, 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 1 except for the fixed part 5 in a part of the longitudinal direction. The buckling 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.

  Further, in the combined state, both ends in the longitudinal direction of the brace core material 1 protrude from both longitudinal ends of the first buckling restraining member 2 and the second buckling restraining member 3, and The protruding portions at both ends in the longitudinal direction serve as connection portions 4 for connection to the building structural material 15 (bearing wall frames, columns, beams, etc.).

  At both ends in the longitudinal direction of the brace core material 1, the restraining portions 13 are formed from one end portion in the longitudinal direction across the groove 11 of the second buckling restraining member 3 from inside the groove 11 along the longitudinal direction of the brace core material 1. A continuous reinforcing member 12 is provided.

  The reinforcing member 12 is fixed to the brace core 1 so that the restraining portion 13 faces the central portion of the brace core 1, and the fixation is fixed to the brace core 1 outside the groove 11 and inside the groove 11. The

  The position where the reinforcing member 12 is fixed to the brace core 1 in the groove 11 is shifted from the end in the groove 11 of the reinforcing member 12 toward the connecting portion 4, and the fixing end of the reinforcing member 12 in the groove 11 is located. The (welding end) position is the continuous base position of the restraining portion 13 in the reinforcing member 12.

  The restraining portion 13 is not fixed to the brace core material 1.

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

  In the embodiment shown in FIG. 1 to FIG. 9, a pair of opposed inner surfaces of the two opposed pairs of inner surfaces of the first buckling restraining member 2 made of a rectangular metal cylinder, and a long plate-like brace core material 1. The second buckling restraining members 3 are interposed between the two outer surfaces.

  In this embodiment, the front ends of the flanges 7 face each other so that the grooves 11 of the second buckling restraining members 3 are opened on both outer surfaces of the long plate-like brace core material 1, Each web 8 of the buckling restraint member 3 is interposed so as to face a pair of opposed inner surfaces of the first buckling restraint member 2.

  Reinforcing members 12 that are long in the longitudinal direction of the brace core material 1 are fixed to both outer surfaces of both ends of the long plate-shaped brace core material 1 by welding.

  The reinforcing member 12 is fixed by welding except for the restraining portion 13 extending to one end portion to form a fixing portion 14. Further, the restraining portion 13 is not fixed to the brace core material 1, and the restraining portion 13 is in contact with the plate surface of the brace core material 1 in this embodiment.

  The long plate-like brace core 1 and both long second buckling restraining members 3 are welded as shown in FIGS. 1, 3, 7, and 9 only at the substantially central portion in the longitudinal direction. The fixing portion 5 is fixed to be fixed, and the portions other than the fixing portion 5 are relatively fixed without being fixed as shown in FIGS. 5, 6, and 8.

  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. 1, 3, 7, and 9, the corner portion formed by the surface between the outer surface of the brace core material 1 and the outer surface of the flange 7 of the second buckling restraining member 2. Since a sufficient weld length can be secured with both, welding workability is improved, and 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 shown in FIG. 2, the reinforcing members 12 fixed to both ends of the brace core material 1 are arranged from the outside of the groove 11 to the inside of the groove 11 of the second buckling restraining member 3. Further, the fixing portion 14 between the reinforcing member 12 and the brace core material 1 exists outside the groove 11 and inside the groove 11, and the restraining portion 13 exists in the groove 11.

  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, As shown in FIG. 9, the first buckling restraining member 2 made of a rectangular metal cylinder is inserted from the opening at one end in the longitudinal direction.

  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 connecting portions 4 at both ends in the longitudinal direction of the brace core material 1 to the structural material 15 of the building.

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

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

  10 and 11 show an example in which the buckling-restrained brace 10 is connected to a column of a load-bearing frame, which is a structural material, or a column on the site via a joint member 16 in the present embodiment.

  The joint member 16 is formed by providing fixing plate portions 18 at both upper and lower ends of a groove-shaped metal main portion 17.

  The connecting portion 4 at the end of the buckling restrained brace 10 is fitted into the groove portion 19 of the joint member 16, and the connecting portion 4 is fixed to the inner surface of the groove portion 19 by welding or the like.

  The joint member 16 is disposed between a pair of upper and lower receiving members 20 provided on the structural material 15 and is fixed by a bolt 21.

  Although details are omitted, the connecting portion 4 at the other end of the buckling restraint brace 10 is also attached to another structural member 15 via another joint member 16.

  When the buckling restraint brace 10 is connected to the structural material 15 of the building or during transportation, the second buckling restraint member 3 is moved in the longitudinal direction relative to the buckling restraint brace 10 or the second buckling restraint. There may be an external force acting on the member 3 to move the first buckling restraining member 2.

  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. The connection state can be maintained, there is no hindrance in connection work with the building structural material 15, and the connection work can be easily performed.

  As described above, by connecting the connecting portions 4 at both ends in the longitudinal direction of the brace core material 1 to the building structural material 15 (bearing wall frame, column, beam, etc.), the buckling restrained brace 10 is attached.

  Thus, the buckling restrained brace 10 attached to the building structural material 15 can support the horizontal force acting on the structural material 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 generated in the brace core material 1 can be constrained by the first buckling restraining member 2 and the second buckling restraining member 3 in cooperation. it can.

  In addition, since both ends of the brace core material 1 are provided with reinforcing members 12 from the outside of the groove 11 to the inside of the groove 11 and are fixed to the brace core material 1 outside and inside the groove 11, the second buckling is performed. The protruding portion protruding from the end portion of the restraining member 3, that is, the rigidity of the connecting portion 4 against the out-of-plane buckling can be enhanced for reinforcement.

  Here, when the brace core material 1 is compressed, concentrated stress occurs at the final end of the fixing portion 14 of the reinforcing member 12 in the groove 11, and in particular, when the plate thickness of the brace core material 1 is thin, the final of the fixing portion 14. Local buckling occurs at the end, and the proof stress performance becomes unstable when it expands and contracts due to large deformation.

  However, in the present embodiment, the constraining portion 13 extending from one end portion of the reinforcing member 12 in the groove 11 is not firmly fixed to the brace core material 1, so that concentrated stress occurs at the final end of the fixing portion 14 in the groove 11. Even so, the restraining portion 13 that continues from the final end of the fixing portion 14 restrains the brace core 1 from both sides.

  Furthermore, a smooth buckling waveform is induced in the brace core material 1 by the restraining portion 13 appropriately deforming and following the undulation due to the buckling of the brace core material 1.

  As a result, even when it expands and contracts due to a large deformation, stable yield strength performance can be exhibited.

  Moreover, since the 2nd buckling restraint member 3 adheres only in a part of longitudinal direction, the brace core material 1 has a restraint member (the 2nd buckling restraint member 3, the 1st buckling) at the time of an earthquake. The brace core 1 can be expanded and contracted without being affected by the restraining member 2).

  Moreover, the longitudinal direction center part of the brace core material 1 and the 2nd buckling restraining member 3 adhere | attach the center part of a longitudinal direction like this embodiment, Therefore The both ends of the longitudinal direction of the brace core material 1 are attached. Distributing equally the contraction allowance (the connection portion 4 exists within the range of the contraction allowance) protruding from both ends in the longitudinal direction of the second buckling restraining member 3 to both ends of the brace core material 1 It can be shortened compared with the case where it adheres in parts other than a center part. 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.

  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, and obliquely downward. When moved, the region that is not restrained by the restraining member at one end portion (obliquely upper end portion) in the longitudinal direction of the brace core 1 is enlarged, and there is a possibility that a problem in quality of the buckling restraint brace 10 may occur. In this case, there is no such fear, and the buckling restraint performance does not deteriorate.

  In the present 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 member 1, the brace core member 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 acts on the brace core material 1, it is possible to relax the stress by allowing a certain amount of undulation in the width direction of the brace core material 1.

  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. 8 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. 8, t represents 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. 8, 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. 12 shows another embodiment of the buckling restrained brace 10.

  In the above-described embodiment, the restraining portion 13 is in contact with the plate surface of the brace core material 1 over the entire length, but in this embodiment, the portion of the restraining portion 13 that faces the brace core material 1 is the forefront of the restraining portion 13. It becomes the inclined surface 23 inclined so that it may leave | separate from the brace core material 1 so that it goes to.

  Also in the present embodiment, as in the above-described embodiment, when stress concentration occurs at the terminal portion of the fixing portion 14, the occurrence of local buckling can be suppressed by the restraining force of the restraining portion 13.

  In addition, the portion facing the brace core material 1 of the restraining portion 13 is the inclined surface 23, so that the waviness due to the buckling deformation of the brace core material 1 is caused by the triangular gap between the inclined surface 23 and the brace core material 1. In this range, a smooth buckling waveform is induced in the brace core 1.

  As a result, even when it expands and contracts due to a large deformation, stable yield strength performance can be exhibited.

  FIGS. 13 to 19 show still another embodiment of the buckling restrained brace 10.

  In the present embodiment, one second buckling restraining member 3 is interposed between one outer surface of the plate-like brace core material 1 and one inner surface of the first buckling restraining member 2. This is an example in which a reinforcing member 12 is provided on one outer surface. 13 to 19, the basic configuration of the plate-shaped brace core material 1 provided with the reinforcing member 12, the first buckling restraining member 2, and the second buckling restraining member 3, and The adhering relationship between the respective materials is the same as that of the above-described embodiment, and the function and effect are also the same.

  Also in this embodiment, although not shown, an inclined surface 23 that is inclined so as to be away from the brace core 1 as the portion of the restraining portion 13 that faces the brace core 1 approaches the forefront of the restraining portion 13; It may be.

  Further, in each of the above-described embodiments, the example in which the fixing portion 14 that fixes the reinforcing member 12 to the brace core 1 is continuous inside and outside the groove 11 has been shown, but the fixing portion 14 outside the groove 11 and the fixing in the groove 11 are shown. The part 14 may be discontinuous.

  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 11 Groove 12 Reinforcement member 13 Restraint part 15 Structural material

Claims (3)

A first buckling restraining member comprising a long plate-shaped brace core material, a long rectangular metal tube that is fitted over substantially the entire length excluding both ends in the longitudinal direction of the brace core material; A long second buckling restraining member interposed between the outer surface of the brace core material and the inner surface of the first buckling restraining member over the entire length in the longitudinal direction;
The second buckling restraining member has a cross-sectional groove shape, and the groove opens to the brace core material side,
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,
Both end portions in the longitudinal direction of the brace core member project from the both end portions in the longitudinal direction of the first buckling restraining member and the second buckling restraining member to become connection portions for connecting to the building structural material. ,
At both ends of the brace core material, a reinforcing member that extends a restraint portion from one end in the longitudinal direction is provided so as to extend from the outside of the groove to the inside of the groove and the restraint portion is located in the groove. A reinforcing member is fixed to the brace core material outside the groove and inside the groove,
The buckling constraining brace characterized in that the constraining part is not fixed to the brace core material.   The buckling constraining brace according to claim 1, wherein a portion of the constraining portion facing the brace core material is inclined so as to move away from the brace core material toward the forefront of the constraining portion. The reinforcing member elongated in a direction along the longitudinal direction of the brace core material is provided on both surfaces of both ends in the longitudinal direction of the long plate-shaped brace core material, respectively. The buckling restraint brace of Claim 1 or Claim 2.

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