Buckling Restrained Brace

Abstract

To provide a buckling restraint brace that can easily manage performance changes of the buckling restraint brace due to aging. [Solution] The buckling restraint brace comprises a core material extending in the axial direction, a plurality of plate-shaped steel materials arranged along the outer surface of the core material and restraining the buckling of the core material, and wood arranged on the opposite side of the steel materials from the core material, and is provided with connecting members that connect opposing portions of the plurality of steel materials on the outer side of the core material in a state where relative movement is restricted, and the wood is fixed to the plurality of steel materials by the connecting members.

Description

[Technical Field]

[0001] The present disclosure relates to buckling restrained braces. [Background technology]

[0002] A known buckling-restrained brace is one that uses wood to improve design (see, for example, Patent Document 1). The buckling-restrained brace in Patent Document 1 includes steel plates arranged on both sides of a plate-shaped core material and wood that covers the entire periphery of the core material. In the buckling-restrained brace in Patent Document 1, the steel plates suppress local buckling of the core material, and the wood suppresses global buckling of the core material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7481519 Summary of the Invention [Problem to be solved by the invention]

[0004] As wood dries and shrinks over time, the wood's ability to prevent global buckling decreases. On the other hand, the steel plate's ability to prevent local buckling is relatively resistant to deterioration over time. As a result, the degree of change over time in the effect of preventing local buckling differs from the degree of change over time in the effect of preventing global buckling, making it difficult to manage changes in the performance of buckling-restrained braces.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a buckling-restrained brace that makes it easy to manage changes in the performance of the buckling-restrained brace due to aging. [Means for solving the problem]

[0006] A buckling restraint brace according to one aspect of the present disclosure is a buckling restraint brace comprising a core material extending in the axial direction, a plurality of plate-shaped steel materials arranged along the outer surface of the core material and restraining the buckling of the core material, and wood arranged on the opposite side of the steel materials from the core material, and further comprising connecting members that connect opposing portions of the plurality of steel materials on the outer side of the core material in a state in which relative movement is restricted, and the wood is fixed to the plurality of steel materials by the connecting members. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to provide a buckling restrained brace that makes it easy to manage changes in the performance of the buckling restrained brace due to aging. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a buckling restrained brace according to the first embodiment. [Figure 2] FIG. 2 is a front view of the buckling restrained brace according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. [Figure 5] FIG. 10 is a cross-sectional view of a buckling restrained brace according to a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view of a buckling restrained brace according to a modification of the second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a buckling restrained brace according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment A buckling restrained brace 1A according to a first embodiment of the present disclosure will be described below with reference to the drawings. The buckling restrained brace 1A is attached to a structure such as a building, for example. In this way, the buckling restrained brace 1A reinforces the structure. As shown in FIG. 1, the buckling restrained brace 1A includes a core material 10, steel materials 20, spacer members 30, wood 40, connecting members 50, and unbonded materials 60 (see FIG. 3).

[0010] The core material 10 extends in the axial direction. Both ends of the core material 10 are attached to the structure of a building to reinforce the building. The core material 10 includes a main core material 11 (plate-shaped portion) and a secondary core material 12 (plate-shaped portion).

[0011] The main core material 11 is a flat plate made of steel plate. The secondary core material 12 is a plate-shaped member made of steel plate. The secondary core material 12 is arranged vertically on both side surfaces of the main core material 11 in the thickness direction. The secondary core material 12 reinforces the main core material 11 and prevents the main core material 11 from bending in the thickness direction.

[0012] Hereinafter, when describing each direction in the buckling restrained brace 1A, the axial direction of the core material 10 will be referred to as the axial direction Z. The width direction of the main core material 11 will be referred to as the first orthogonal direction X. In other words, the first orthogonal direction X is also the thickness direction of the secondary core material 12. The thickness direction of the main core material 11 will be referred to as the second orthogonal direction Y. In other words, the second orthogonal direction Y is also the width direction of the secondary core material 12. The axial direction Z, the first orthogonal direction X, and the second orthogonal direction Y are perpendicular to one another. Furthermore, a cross section perpendicular to the axial direction Z will be referred to as an axial-orthogonal cross section. In other words, an axial-orthogonal cross section is a cross section extending along the first orthogonal direction X and the second orthogonal direction Y.

[0013] As shown in FIG. 2, the main core material 11 includes a first narrow portion 11a (plasticized portion), a first wide portion 11b (end portion), and a first width-varying portion 11c.

[0014] The first narrow width portion 11a is located in the center of the main core material 11 in the axial direction Z. The first wide width portion 11b is located at both ends of the main core material 11 in the axial direction Z. The width of the first wide width portion 11b is greater than the width of the first narrow width portion 11a. The length of the first wide width portion 11b in the axial direction Z is shorter than the length of the first narrow width portion 11a in the axial direction Z. Because the center of the main core material 11 in the axial direction Z is the first narrow width portion 11a and the ends in the axial direction Z are the first wide width portions 11b, the center of the main core material 11 in the axial direction Z (first narrow width portion 11a) becomes a region that is easily plasticized, and the plasticized portion is limited to this center.

[0015] The first width-changing portion 11c is a boundary region between the first wide portion 11b and the first narrow portion 11a. The width of the first width-changing portion 11c changes along the axial direction Z. The width of the first width-changing portion 11c narrows from the end portion of the main core material 11 in the axial direction Z (i.e., the side of the first wide portion 11b) toward the center portion of the main core material 11 in the axial direction Z (i.e., the side of the first narrow portion 11a). The first width-changing portion 11c absorbs, for example, an additional bending moment acting on the main core material 11.

[0016] The secondary core material 12 is provided on the front and back surfaces of the main core material 11 (i.e., the surfaces facing the second orthogonal direction Y). The secondary core material 12 is joined to the center of the main core material 11 in the first orthogonal direction X in an orientation perpendicular to the main core material 11. The secondary core material 12 is joined to the main core material 11 by welding. In this embodiment, the secondary core material 12 is provided over the entire area of ​​the main core material 11 in the axial direction Z. In other words, the secondary core material 12 has a portion that overlaps with the first narrow portion 11a of the main core material 11 in the axial direction Z.

[0017] The secondary core 12 includes a second narrow portion 12a (plasticized portion), a second wide portion 12b (end portion), and a second width-varying portion 12c.

[0018] The second narrow width portion 12a is located in the center of the secondary core 12 in the axial direction Z. The second wide width portions 12b are located at both ends of the secondary core 12 in the axial direction Z. The width of the second wide width portion 12b is wider than the width of the second narrow width portion 12a. The length of the second wide width portion 12b in the axial direction Z is shorter than the length of the second narrow width portion 12a in the axial direction Z. The length of the second narrow width portion 12a in the axial direction Z is equal to the length of the first narrow width portion 11a in the axial direction Z. Because the center of the secondary core 12 in the axial direction Z is the second narrow width portion 12a and the ends in the axial direction Z are the second wide width portions 12b, the center of the secondary core 12 in the axial direction Z (second narrow width portion 12a) becomes a region that is easily plasticized, and the plasticized portion is limited to this center.

[0019] The second width-changing portion 12c is a boundary region between the second wide portion 12b and the second narrow portion 12a. The width of the second width-changing portion 12c changes along the axial direction Z. The width of the second width-changing portion 12c narrows from the end portion of the secondary core 12 in the axial direction Z (i.e., the second wide portion 12b side) toward the center portion of the secondary core 12 in the axial direction Z (i.e., the second narrow portion 12a side). The second width-changing portion 12c absorbs, for example, an additional bending moment acting on the secondary core 12.

[0020] Hereinafter, the first narrow portion 11a of the main core material 11 and the second narrow portion 12a of the secondary core material 12 are collectively referred to as the narrow portion (plasticized portion) of the core material 10. In this embodiment, the narrow portion (plasticized portion) of the core material 10 has a plus (+) shape in cross section perpendicular to the axis. Additionally, the first wide portion 11b of the main core 11 and the second wide portion 12b of the secondary core 12 are collectively referred to as the wide portion (end) of the core 10. Bolt holes are formed in the wide portion (end) of the core 10. The buckling restrained brace 1A is attached to a structure by bolts (not shown) inserted into the bolt holes.

[0021] FIG. 3 is a cross-sectional view of the buckling restrained brace 1A at the narrow portion (plasticized portion) of the core material 10. FIG. 4 is a cross-sectional view of the buckling restrained brace 1A at the wide portion (end portion) of the core material 10. As shown in FIGS. 3 and 4, the steel material 20 is a plate-like member having an L-shaped cross section perpendicular to the axis. Multiple steel materials 20 (four in this embodiment) are arranged along the outer circumferential surface of the core material 10. The four steel materials 20 are respectively arranged at the four internal corners of the narrow portion (plasticized portion) of the core material 10, which has a plus (+)-shaped cross section perpendicular to the axis. A gap is formed between the inner surface of the steel material 20 and the outer surface of the core material 10. An unbonded material 60 is arranged between the inner surface of the steel material 20 and the outer surface of the core material 10.

[0022] The multiple steel materials 20 restrain buckling of the core material 10. The multiple steel materials 20 suppress local buckling of the core material 10. Local buckling of the core material 10 refers to local deformation of the core material 10 when a compressive force is applied in the longitudinal direction of the core material 10.

[0023] The length in the axial direction Z of the steel material 20 is shorter than the length in the axial direction Z of the entire core material 10. The length in the axial direction Z of the steel material 20 is longer than the length in the axial direction Z of the narrow portion of the core material 10. The steel material 20 is provided in a position in the axial direction Z where it overlaps with at least the narrow portion of the core material 10. Furthermore, the steel material 20 extends in the axial direction Z to a position where it overlaps with at least a portion of the wide portion of the core material 10.

[0024] The steel material 20 has a first plate portion 21, a second plate portion 22, and a connecting portion 23 that connects the first plate portion 21 and the second plate portion 22 together.

[0025] The first plate portion 21 is disposed along the outer surface of the main core material 11. In the axially orthogonal cross section, the first plate portion 21 extends in the width direction of the main core material 11 (first orthogonal direction X). The first plate portion 21 faces the main core material 11 in the thickness direction of the main core material 11 (second orthogonal direction Y). The first plate portion 21 is provided at a distance from the main core material 11. The second plate portion 22 is disposed along the outer surface of the secondary core 12. In the axially orthogonal cross section, the second plate portion 22 extends in the width direction of the secondary core 12 (second orthogonal direction Y). The second plate portion 22 faces the secondary core 12 in the thickness direction of the secondary core 12 (first orthogonal direction X). The second plate portion 22 is provided at a distance from the secondary core 12.

[0026] The plurality of steel materials 20 have opposing portions 20a that face each other on the outer side of the core material 10. Specifically, the steel materials 20 adjacent to each other in the second orthogonal direction Y have opposing portions 20a in the first plate portion 21 that face each other in the second orthogonal direction Y and are located outward of the core material 10 (main core material 11) in the first orthogonal direction X. The steel materials 20 adjacent to each other in the first orthogonal direction X have opposing portions 20a in the second plate portion 22 that face each other in the first orthogonal direction X and are located outward of the core material 10 (secondary core material 12) in the second orthogonal direction Y. An insertion hole 20b is formed in the opposing portion 20a, through which a bolt B of a connecting member 50, which will be described later, is inserted.

[0027] The spacer member 30 is a plate-shaped member. The spacer member 30 is provided in the axial direction Z within the range of the narrow portions (first narrow portion 11a, second narrow portion 12a) of the core material 10. A plurality of spacer members 30 (four in this embodiment) are arranged between the opposing portions 20a of the plurality of steel materials 20. The spacer members 30 abut against the opposing portions 20a of the steel materials 20. The spacer members 30 serve to maintain a constant distance between the opposing portions 20a of the plurality of steel materials 20. A gap is formed between the spacer member 30 and the outer surface of the core material 10. An unbond material 60 is arranged between the spacer member 30 and the outer surface of the core material 10. The spacer member 30 also has an insertion hole 30a formed therein, through which the bolt B of the connecting member 50 is inserted.

[0028] The spacer member 30 includes a first spacer member 31 and a second spacer member 32 .

[0029] The first spacer members 31 are arranged between the opposing portions 20a of the first plate portions 21 of the steel materials 20. The first spacer members 31 are arranged adjacent to the first narrow width portion 11a of the main core material 11 on the outer side in the plate width direction (first orthogonal direction X) of the first narrow width portion 11a. Two first spacer members 31 are provided on one side and the other side in the first orthogonal direction X, sandwiching the first narrow width portion 11a of the main core material 11 therebetween.

[0030] The second spacer members 32 are arranged between the opposing portions 20a of the second plate portions 22 of the steel material 20. The second spacer members 32 are arranged adjacent to the second narrow width portion 12a of the secondary core material 12 on the outer side in the plate width direction (second orthogonal direction Y) of the second narrow width portion 12a. Two second spacer members 32 are provided on one side and the other side in the second orthogonal direction Y, sandwiching the second narrow width portion 12a of the secondary core material 12 therebetween.

[0031] By arranging the first spacer member 31 and the second spacer member 32 as described above, the plurality of steel materials 20 and the plurality of spacer members 30 form a closed cross section in the axial cross section within the range of the narrow portion of the core material 10 in the axial direction Z. That is, the plurality of steel materials 20 and the plurality of spacer members 30 surround the entire circumference of the narrow portion of the core material 10 in the axial cross section.

[0032] The first spacer member 31 has a dimension in the thickness direction (second orthogonal direction Y) of the first narrow width portion 11a that is larger than the thickness of the first narrow width portion 11a. The second spacer member 32 has a dimension in the thickness direction (first orthogonal direction X) of the second narrow width portion 12a that is larger than the thickness of the second narrow width portion 12a. This allows the spacer member 30 (first spacer member 31, second spacer member 32) to maintain a constant distance between the opposing portions 20a of the multiple steel materials 20 with a gap formed between the inner surface of the steel material 20 and the outer surface of the core material 10.

[0033] The spacer member 30 (first spacer member 31, second spacer member 32) may be configured by stacking multiple steel plates in the plate thickness direction. In this case, the plate thickness of the spacer member 30 can be easily adjusted, and the dimension of the gap between the opposing portions 20a of the multiple steel materials 20 can be easily adjusted. Furthermore, the spacer member 30 (first spacer member 31, second spacer member 32) may be configured by arranging multiple steel plates in the axial direction Z. If the spacer member 30 is configured from a single steel plate, the length of the steel plate in the axial direction Z becomes long, and the steel plate is likely to warp or bend. By configuring the spacer member 30 from multiple steel plates arranged in the axial direction Z, the length of each steel plate in the axial direction Z can be shortened and warping or bending can be suppressed, making it easier to ensure the linearity of the spacer member 30 and facilitate manufacturing.

[0034] The unbonding material 60 is disposed between the inner surface of the steel material 20 and the outer surface of the core material 10, and between the spacer members 30 and the outer surface of the core material 10. The unbonding material 60 is provided on the entire outer surface of the core material 10, in a portion surrounded by the plurality of steel materials 20 and the plurality of spacer members 30. The unbonding material 60 is formed as an anti-adhesion coating made of a viscoelastic material such as butyl rubber. Materials other than butyl rubber include, for example, viscoelastic plastics, natural rubber, polyisoprene, polybutadiene, styrene butadiene rubber, ethylene propylene rubber, polychloroprene, polyisobutylene, asphalt, paint, and mixtures thereof.

[0035] The unbond material 60 has the function of suppressing deformation of the steel material 20 when the narrow portion of the core material 10 is deformed by an external force, for example. Furthermore, by providing the unbond material 60, it is possible to ensure a uniform gap between the inner surface of the steel material 20 and the outer surface of the core material 10. Note that if the spacer member 30 can ensure a gap between the inner surface of the steel material 20 and the outer surface of the core material 10, the unbond material 60 may be omitted.

[0036] The wooden pieces 40 are prism members having a rectangular cross section perpendicular to the axis. A plurality of wooden pieces 40 (four in this embodiment) are placed at the inside corners of the plurality of steel materials 20. The wooden pieces 40 abut against the steel materials 20. The wooden pieces 40 are placed on the opposite side of the steel materials 20 from the core material 10. The length of the wooden pieces 40 in the axial direction Z is equal to the length of the steel materials 20 in the axial direction Z. The plurality of wooden pieces 40 cover at least a portion of the core material 10 and the plurality of steel materials 20. The plurality of wooden pieces 40 suppress overall buckling of at least the core material 10. Overall buckling of the core material 10 refers to deformation of the entire core material 10 in response to an external input. The wooden pieces 40 have insertion holes 40a through which bolts B of the connecting member 50 are inserted.

[0037] The wooden piece 40 has a first surface 41 that contacts the first board portion 21, a second surface 42 that contacts the second board portion 22, and a third surface 43 that connects the first surface 41 and the second surface 42. The third surface 43 is formed by cutting out a corner of the wooden piece 40. The third surface 43 faces the connecting portion 23. The third surface 43 is positioned away from the connecting portion 23. By ensuring a gap (play) between the third surface 43 and the connecting portion 23, the first surface 41 can be brought into contact with the first board portion 21 without any gap, and the second surface 42 can be brought into contact with the second board portion 22 without any gap.

[0038] The connecting member 50 connects one piece of wood 40, the facing portions 20a of one steel material 20, the spacer member 30, the facing portions 20a of other steel materials 20, and other pieces of wood 40 that are aligned in the first orthogonal direction X or the second orthogonal direction Y. Specifically, the connecting member 50 connects the facing portions 20a of the multiple steel materials 20 in a state in which relative movement is restricted. The connecting member 50 connects the facing portions 20a of the steel materials 20 to be connected and the spacer member 30 in a state in which they are stacked. The connecting member 50 also fixes the wood 40 to the steel materials 20. 2 and 3, the connecting member 50 is provided in the range of the narrow portions (first narrow portion 11a, second narrow portion 12a) of the core material 10 in the axial direction Z. As shown in Fig. 4, the connecting member 50 is not provided in the range of the wide portions (first wide portion 11b, second wide portion 12b) of the core material 10 in the axial direction Z.

[0039] The connecting member 50 includes a bolt B, a pair of first nuts N1, and a pair of second nuts N2.

[0040] Bolt B is a stud bolt and is inserted through the insertion hole 40a of one piece of wood 40, the insertion hole 20b of the opposing portion 20a of one steel material 20, the insertion hole 30a of the spacer member 30, the insertion hole 20b of the opposing portion 20a of another steel material 20, and the insertion hole 40a of another piece of wood 40, in this order.

[0041] The pair of first nuts N1 are provided to sandwich the stacked portion of the facing portion 20a of one steel material 20, the spacer member 30, and the facing portion 20a of the other steel material 20. The first nuts N1 are fixed to the steel material 20 or the wooden material 40. The first nuts N1 may be welded to the facing portion 20a of the steel material 20, for example. In this case, a counterbore for accommodating the first nut N1 may be formed in the wooden material 40. The first nuts N1 may be embedded in the wooden material 40. The first nuts N1 are fixed to the steel material 20 or the wooden material 40 in advance before the bolt B is inserted into each member.

[0042] A bolt B is screwed into the first nut N1. That is, a helical male thread groove is formed on the outer surface of the bolt B, and a helical female thread groove corresponding to the male thread groove of the bolt B is formed on the inner surface of the first nut N1. The pair of first nuts N1 face each other in the insertion direction of the bolt B, and therefore the helical directions of the female thread grooves of the pair of first nuts N1 are opposite to each other. By screwing the bolt B into the pair of first nuts N1, the facing portions 20a of multiple steel materials 20 can be connected to each other. An opening for exposing the first nut N1 to the outside may be formed in the wooden piece 40. In this case, the first nut N1 can be tightened from the outside.

[0043] A pair of second nuts N2 are threaded onto both ends of the bolt B. That is, a helical female thread groove corresponding to the male thread groove of the bolt B is formed on the inner surface of the second nut N2. With the bolt B inserted into each member, the second nut N2 is fastened to the end of the bolt B, thereby fixing the wooden piece 40 to the steel material 20. At this time, it is preferable to firmly tighten the second nut N2 to fix the wooden piece 40 to the steel material 20 while pressing it against the steel material 20. As a result, even if the wooden piece 40 shrinks due to drying, the tightening tension of the second nut N2 can absorb the shrinkage. Note that the second nut N2 may be retightened during maintenance of the buckling-restrained brace 1A.

[0044] It is preferable to place a washer W between the second nut N2 and the wooden piece 40. This prevents the second nut N2 from biting into the surface of the wooden piece 40. In this embodiment, the second nut N2 protrudes outward from the wooden piece 40. This configuration makes it easy to retighten the second nut N2 during maintenance of the buckling restrained brace 1A, improving workability.

[0045] The connecting member 50 includes a first connecting member 51 and a second connecting member 52 .

[0046] The first connecting members 51 connect the opposing portions 20a of the first plate portions 21 of the multiple steel materials 20 together. As shown in FIG. 2, the first connecting members 51 are arranged at positions that do not overlap with the core material 10 when viewed from the opposing direction in which the opposing portions 20a of the first plate portions 21 face each other (i.e., the second orthogonal direction Y). The first connecting members 51 are provided on one side and the other side of the first narrow width portion 11a of the main core material 11 in the first orthogonal direction X. Furthermore, on each of the one side and the other side of the first orthogonal direction X, multiple first connecting members 51 are provided at intervals in the axial direction Z. The pair of first connecting members 51 provided on one side and the other side of the first orthogonal direction X are arranged at the same position in the axial direction Z.

[0047] The second connecting members 52 connect the opposing portions 20a of the second plate portions 22 of the multiple steel materials 20 together. The second connecting members 52 are arranged in positions that do not overlap with the core material 10 when viewed from the opposing direction in which the opposing portions 20a of the second plate portions 22 face each other (i.e., the first orthogonal direction X). The second connecting members 52 are provided on one side and the other side of the second narrow width portion 12a of the secondary core material 12 in the second orthogonal direction Y. Furthermore, on each of the one side and the other side of the second orthogonal direction Y, multiple second connecting members 52 are provided at intervals in the axial direction Z. Pairs of second connecting members 52 provided on one side and the other side of the second orthogonal direction Y are arranged at the same position in the axial direction Z.

[0048] The bolts B of the first connecting members 51 extend in the second orthogonal direction Y, and the bolts B of the second connecting members 52 extend in the first orthogonal direction X. That is, the bolts B of the first connecting members 51 and the bolts B of the second connecting members 52 extend perpendicular to each other. Furthermore, the multiple first connecting members 51 and the multiple second connecting members 52 are arranged alternately in the axial direction Z. This ensures uniform buckling restraint by the wooden material 40 and the steel material 20 in the main core material 11 and the secondary core material 12.

[0049] As described above, the buckling restrained brace 1A according to this embodiment comprises a core material 10 extending in the axial direction Z, a plurality of plate-shaped steel materials 20 arranged along the outer circumferential surface of the core material 10 and restraining the buckling of the core material 10, and wooden pieces 40 arranged on the opposite side of the steel materials 20 from the core material 10. The buckling restrained brace 1A also comprises connecting members 50 that connect opposing portions 20a of the plurality of steel materials 20 that face each other on the outer side of the core material 10 in a state in which relative movement is restricted. The wooden pieces 40 are fixed to the plurality of steel materials 20 by the connecting members 50. With the above configuration, the wooden material 40 and the steel material 20 work together to restrain the buckling of the core material 10. Even if the wooden material 40 dries and shrinks over time, the wooden material 40 is integrated with the steel material 20, preventing the effects of global and local buckling from changing separately over time, as in the past. This makes it easier to manage changes in the performance of the buckling-restrained brace 1A over time.

[0050] In addition, an unbond material 60 is disposed between the inner surface of the steel material 20 and the outer surface of the core material 10 . According to the above configuration, by providing the unbonded material 60, it is possible to ensure a uniform gap between the inner surface of the steel material 20 and the outer surface of the core material 10.

[0051] The core material 10 includes plate-like portions (main core material 11, secondary core material 12), each of which has a plasticized portion (first narrow portion 11a, second narrow portion 12a) and both end portions (first wide portion 11b, second wide portion 12b) with a plate width greater than that of the plasticized portion. The buckling-restrained brace 1A further includes spacer members 30 arranged between the opposing portions 20a at locations adjacent to the outer sides of the plasticized portion in the plate width direction within the range of the plasticized portion in the axial direction Z. The connecting member 50 connects the opposing portions 20a of the steel materials 20 to be connected and the spacer members 30 in a stacked state, and the multiple steel materials 20 and the spacer members 30 form a closed cross section in a cross section orthogonal to the axis of the core material 10. According to the above configuration, the spacer member 30 can maintain a constant distance between the opposing portions 20a of the multiple steel materials 20. Furthermore, in the range in which the plasticized portion exists in the axial direction Z, the multiple steel materials 20 and the spacer member 30 form a closed cross section in a cross section orthogonal to the axis of the core material 10. Therefore, the multiple steel materials 20 can more reliably restrain buckling of the core material 10.

[0052] Furthermore, in the spacer member 30, the dimension of the plasticized portion in the thickness direction is greater than the thickness of the plasticized portion. According to the above configuration, the spacer member 30 can maintain a constant distance between the opposing portions 20a of the multiple steel materials 20 while a gap is formed between the steel materials 20 and the core material 10 (plasticized portion).

[0053] Furthermore, the steel material 20 has a first plate portion 21 extending in a first orthogonal direction X in a cross section orthogonal to the axis of the core material 10, and a second plate portion 22 extending in a second orthogonal direction Y in a cross section orthogonal to the axis of the core material 10. The wooden piece 40 has a first surface 41 in contact with the first plate portion 21, a second surface 42 in contact with the second plate portion 22, and a third surface 43 connecting the first surface 41 and the second surface 42. The third surface 43 is a surface facing the steel material 20 and is arranged away from the steel material 20. According to the above configuration, by ensuring a gap (play) between the third surface 43 and the steel material 20, the first surface 41 can be abutted against the first plate portion 21 without any gap, and the second surface 42 can be abutted against the second plate portion 22 without any gap.

[0054] Second Embodiment Next, a buckling restrained brace 1B according to a second embodiment of the present disclosure will be described. In this embodiment, the same components as those in the first embodiment will be assigned the same reference numerals, and their description will be omitted. Only the differences will be described.

[0055] Figure 5 is a cross-sectional view of a buckling restrained brace 1B according to the second embodiment. As shown in Figure 5, the buckling restrained brace 1B includes a core material 110, steel materials 120, spacer members 30, wood 140, connecting members 50, and unbonded materials 60. Note that the configurations of the spacer members 30, connecting members 50, and unbonded materials 60 are the same as those in the first embodiment, and therefore will not be described here.

[0056] In this embodiment, the narrow width portion (plasticized portion) of the core material 110 has a minus (-) shape in a cross section perpendicular to the axis. That is, the narrow width portion (plasticized portion) of the core material 110 is composed of a single flat plate. Specifically, the core material 110 has a main core material 111 (plate-shaped portion) and a secondary core material (not shown in FIG. 5). The main core material 111 is a flat plate and, like the main core material 11 of the first embodiment, has a first narrow width portion 11a (plasticized portion), a first wide width portion 11b (end portion), and a first width-varying portion 11c. The secondary core materials of the core material 110 are provided at both ends of the main core material 111 in the axial direction Z (i.e., the first wide width portion 11b). The secondary core materials of the core material 110 do not have a portion that overlaps with the first narrow width portion 11a of the main core material 111 in the axial direction Z.

[0057] The steel material 120 is a plate-like member having a T-shaped cross section perpendicular to the axis. A plurality of steel materials 120 (two in this embodiment) are arranged along the outer circumferential surface of the core material 110. The plurality of steel materials 120 restrain the core material 110 from buckling.

[0058] Specifically, the steel material 120 has a first plate portion 121 and a second plate portion 122. The first plate portion 121 is disposed along the outer surface of the main core material 111. In the axially orthogonal cross section, the first plate portion 121 extends in the width direction of the main core material 111 (first orthogonal direction X). The first plate portion 121 faces the main core material 111 in the thickness direction of the main core material 111 (second orthogonal direction Y). The first plate portion 121 is provided at a distance from the main core material 111. The second plate portion 122 is a reinforcing rib that reinforces the first plate portion 121. In an axially orthogonal cross section, the second plate portion 122 extends in the second orthogonal direction Y. The second plate portion 122 is joined to the first plate portion 121 at the center of the first plate portion 121 in the first orthogonal direction X in an orientation orthogonal to the first plate portion 121. The second plate portion 122 is joined to the first plate portion 121 by welding.

[0059] The first plate portions 121 of the multiple steel materials 120 have opposing portions 120a that face each other on the outer side of the core material 110 (main core material 111). The spacer members 30 are disposed between the opposing portions 120a of the multiple steel materials 120. Two spacer members 30 are provided on one side and the other side in the first orthogonal direction X, sandwiching the first narrow portion 11a of the main core material 111. As a result, in the range of the narrow portion of the core material 110 in the axial direction Z, the multiple steel materials 120 and the multiple spacer members 30 form a closed cross section in the axially orthogonal cross section.

[0060] The wooden pieces 140 are prismatic members having a rectangular cross section perpendicular to the axis. A plurality of wooden pieces 140 (four in this embodiment) are provided. Specifically, two wooden pieces 140 are arranged for one steel material 120, sandwiching the second plate portion 122 of the steel material 120 in the first orthogonal direction X. The length of the second plate portion 122 in the second orthogonal direction Y is equal to the length of the wooden piece 140 in the second orthogonal direction Y. The wooden pieces 140 abut against the steel material 120. The wooden pieces 140 are arranged on the opposite side of the steel material 120 from the core material 110. The plurality of wooden pieces 140 cover at least a portion of the core material 110 and the plurality of steel materials 120. The plurality of wooden pieces 140 at least suppress overall buckling of the core material 110.

[0061] The wooden piece 140 has a first surface 141 that contacts the first plate portion 121, a second surface 142 that contacts the second plate portion 122, and a third surface 143 that connects the first surface 141 and the second surface 142. The third surface 143 is formed by cutting out a corner of the wooden piece 140. The third surface 143 faces the steel material 120. The third surface 143 is positioned away from the steel material 120. By ensuring a gap (play) between the third surface 143 and the steel material 120, the first surface 141 can be brought into contact with the first plate portion 121 without any gap, and the second surface 142 can be brought into contact with the second plate portion 122 without any gap.

[0062] The wooden piece 140 also has an insertion hole 140a formed therein, through which the bolt B of the connecting member 50 is inserted. The insertion hole 140a has a counterbore 140b. The counterbore 140b opens to the outer surface of the wooden piece 140. The second nut N2 of the connecting member 50 is housed in the counterbore 140b. With this configuration, the second nut N2 is disposed inside the wooden piece 140. Therefore, the second nut N2 does not protrude from the wooden piece 140, improving the design of the buckling restrained brace 1B and preventing the second nut N2 from coming into contact with other components, etc.

[0063] With the buckling-restrained brace 1B of this embodiment, even when the cross section perpendicular to the axis of the narrow section (plasticized section) of the core material 110 is minus (-) shaped, the wood 140 and steel 120 integrally restrain the buckling of the core material 110. This prevents the effects of suppressing global buckling and local buckling from changing separately over time, as in conventional cases, making it easier to manage changes in the performance of the buckling-restrained brace 1B due to changes over time.

[0064] <Modification of the second embodiment> FIG. 6 is a cross-sectional view of a buckling restrained brace 1C according to a modification of the second embodiment. As shown in FIG. 6, the buckling restrained brace 1C of this modification includes steel members 220 instead of the steel members 120, and wooden members 240 instead of the wooden members 140. The steel members 220 include a first plate member 121 and a second plate member 222. The length of the second plate member 222 in the second orthogonal direction Y is shorter than the length of the wooden members 240 in the second orthogonal direction Y. Two wooden members 240 are provided corresponding to the two steel members 220, respectively, and the second plate members 222 are housed inside the wooden members 240. Slits 240a that house the second plate members 222 are formed in the wooden members 240. With this configuration, the steel members 220 are not exposed on the side surfaces of the buckling restrained brace 1C facing the second orthogonal direction Y, improving the design. In this modification, the thickness of the second plate portion 222 may be made thicker than the thickness of the first plate portion 121 in order to increase the cross-sectional area of ​​the second plate portion 222.

[0065] <Third embodiment> Next, a buckling restrained brace 1D according to a third embodiment of the present disclosure will be described. In this embodiment, the same components as those in the first embodiment will be assigned the same reference numerals, and their description will be omitted, with only the differences being described.

[0066] Figure 7 is a cross-sectional view of a buckling restrained brace 1D according to the third embodiment. As shown in Figure 7, the buckling restrained brace 1D includes a core material 310, steel material 320, wood 340, connecting members 50, and unbonded materials 60. The buckling restrained brace 1D does not include spacer members. Note that the configurations of the connecting members 50 and unbonded materials 60 are the same as those in the first embodiment, and therefore will not be described here.

[0067] In this embodiment, the narrow portion (plasticized portion) of the core material 310 has a circular cross section perpendicular to the axis. In the illustrated example, the narrow portion of the core material 310 is a round bar. The narrow portion of the core material 310 may also be cylindrical.

[0068] In this embodiment, a plurality of (two in this embodiment) steel materials 320 are arranged along the outer peripheral surface of the core material 310. The plurality of steel materials 320 restrain the buckling of the core material 310. Specifically, the steel material 320 has a circular plate portion 321 having a semicircular shape that follows the outer peripheral surface of the core material 310, and a pair of flange plate portions 322 that extend radially outward from both ends of the circular plate portion 321. The flange plate portions 322 of the two steel materials 320 abut against each other. The flange plate portions 322 of the two steel materials 320 are opposing portions 320a that face each other on the outer side of the core material 310.

[0069] The wooden piece 340 is a prismatic member having a rectangular cross section perpendicular to the axis. A plurality of wooden pieces 340 (two in this embodiment) are provided. Specifically, one wooden piece 340 is provided for one steel material 320. A circular recess 340a is formed in the wooden piece 340 to accommodate the circular plate portion 321 of the steel material 320. The wooden piece 340 abuts against the steel material 320. The wooden piece 340 is arranged on the opposite side of the steel material 320 from the core material 310. The plurality of wooden pieces 340 cover at least a portion of the core material 310 and the plurality of steel materials 320. The plurality of wooden pieces 340 at least suppress overall buckling of the core material 310.

[0070] With the buckling-restrained brace 1D of this embodiment, even when the cross section perpendicular to the axis of the narrow section (plasticized section) of the core material 310 is circular, the wood 340 and steel 320 integrally restrain the buckling of the core material 310. This prevents the effects of suppressing global buckling and local buckling from changing separately over time, as in conventional braces, making it easier to manage changes in the performance of the buckling-restrained brace 1D due to changes over time.

[0071] The present disclosure is not limited to the above-described embodiment described with reference to the drawings, and various modifications are possible within the technical scope thereof.

[0072] For example, in the first and third embodiments, the second nut N2 protrudes outward from the wooden piece 40, 340, and in the second embodiment, the second nut N2 is housed in a countersink 140b provided in the wooden piece 140. However, in the first and third embodiments, the second nut N2 may be housed in a countersink provided in the wooden piece 40, 340, and in the second embodiment, the second nut N2 may protrude outward from the wooden piece 140.

[0073] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0074] (Addendum) The buckling restrained brace according to the embodiment can be understood, for example, as follows. <1> A buckling restraint brace according to one aspect of the present disclosure is a buckling restraint brace comprising a core material extending in the axial direction, a plurality of plate-shaped steel materials arranged along the outer surface of the core material and restraining the buckling of the core material, and wood arranged on the opposite side of the steel materials from the core material, and further comprising connecting members that connect opposing portions of the plurality of steel materials on the outer side of the core material in a state in which relative movement is restricted, and the wood is fixed to the plurality of steel materials by the connecting members. With this configuration, the wood and steel material integrally restrain the buckling of the core material. Even if the wood shrinks over time, the wood is integrated with the steel material, preventing the effects of global and local buckling from changing separately over time, as was the case with conventional braces. This makes it easier to manage changes in the performance of the buckling-restrained brace over time.

[0075] <2> the above <1> In the buckling restrained brace according to the present invention, an unbonded material may be disposed between the inner surface of the steel material and the outer surface of the core material. According to the above configuration, the provision of the unbonded material makes it possible to ensure a uniform gap between the inner surface of the steel material and the outer surface of the core material.

[0076] <3> the above <1> or <2> In the buckling restraint brace according to the above, the core material includes a plate-like portion, and the plate-like portion has a plasticized portion and both end portions having a plate width larger than that of the plasticized portion, and further includes a spacer member arranged between the opposing portions at a location adjacent to the outer side in the plate width direction of the plasticized portion within the range of the plasticized portion in the axial direction, and the connecting member connects the opposing portions of each of the steel materials to be connected and the spacer member in a stacked state, and the multiple steel materials and the spacer member may form a closed cross section in a cross section perpendicular to the axis of the core material. According to the above configuration, the spacer member can maintain a constant distance between the opposing portions of the multiple steel materials. Furthermore, in the range of the plasticized portion in the axial direction, the multiple steel materials and the spacer member form a closed cross section in the cross section perpendicular to the axis of the core material. Therefore, the multiple steel materials can more reliably restrain buckling of the core material.

[0077] <4> the above <3> In the buckling restrained brace according to the above, the dimension of the plasticized portion in the plate thickness direction of the spacer member may be larger than the plate thickness of the plasticized portion. According to the above configuration, the spacer member can keep the distance between the opposing portions of the plurality of steel materials constant while a gap is formed between the steel material and the core material (plasticized portion).

[0078] <5> the above <1> from <4> In a buckling restraint brace according to any one of the above, the steel material has, in an axial-orthogonal cross section of the core material, a first plate portion extending in a first orthogonal direction that is orthogonal to the axial direction, and a second plate portion extending in a second orthogonal direction that is orthogonal to the axial direction and the first orthogonal direction, in an axial-orthogonal cross section of the core material, and the wooden piece has a first surface in contact with the first plate portion, a second surface in contact with the second plate portion, and a third surface connecting the first surface and the second surface, and the third surface may be a surface facing the steel material and positioned away from the steel material. According to the above configuration, by ensuring a gap (play) between the third surface and the steel material, the first surface can be abutted against the first plate portion without any gap, and the second surface can be abutted against the second plate portion without any gap. [Explanation of symbols]

[0079] 1A, 1B, 1C, 1D Buckling Restrained Brace 10, 110, 310 core material 11, 111 Main core material (plate-shaped part) 11a 1st narrow part (plasticized part) 11b First wide portion (end portion) 12 Secondary core material (plate-shaped part) 12a 2nd narrow part (plasticized part) 12b Second wide section (end) 20, 120, 220, 320 steel 20a, 120a, 320a Opposite part 21, 121 1st plate part 22, 122, 222 2nd plate part 30 Spacer member 40, 140, 240, 340 wood 41, 141 1st page 42, 142 2nd page 43, 143 3rd page 50 Connecting member 60 Unbonded material X First orthogonal direction Y Second orthogonal direction Z Axis direction

Claims

1. a core material extending in the axial direction; a plurality of plate-shaped steel members arranged along an outer peripheral surface of the core member and restraining buckling of the core member; and a piece of wood arranged on the opposite side of the core material with respect to the steel material, a connecting member that connects opposing portions of the plurality of steel materials that face each other on the outer side of the core material in a state in which relative movement is restricted, the wooden piece is fixed to the plurality of steel materials by the connecting member, The connecting member is a buckling restraint brace having a bolt that is inserted into the opposing portion and the wood, a pair of first nuts that are arranged to sandwich the opposing portion and that are screwed onto the bolt, and a second nut that is arranged to sandwich the wood between the opposing portion and that is screwed onto the bolt.

2. The buckling restrained brace of claim 1 , wherein an unbonded material is disposed between the inner surface of the steel material and the outer surface of the core material.

3. the core material includes a plate-like portion, the plate-like portion having a plasticized portion and both end portions having a plate width larger than that of the plasticized portion; In the range in which the plasticized portion exists in the axial direction, a spacer member disposed between the opposing portions at a location adjacent to the outer side of the plasticized portion in the plate width direction; The connecting member connects the opposing portions of the steel materials to be connected and the spacer member in a stacked state, 3. The buckling restraint brace according to claim 1, wherein the plurality of steel members and the spacer members form a closed cross section in a cross section perpendicular to the axis of the core member.

4. The buckling restraint brace according to claim 3 , wherein the dimension of the plasticized portion in the thickness direction of the spacer member is greater than the thickness of the plasticized portion.

5. The steel material has a first plate portion extending in a first orthogonal direction orthogonal to the axial direction in an axially orthogonal cross section of the core material, and a second plate portion extending in a second orthogonal direction orthogonal to the axial direction and the first orthogonal direction in an axially orthogonal cross section of the core material, the wooden piece has a first surface in contact with the first board portion, a second surface in contact with the second board portion, and a third surface connecting the first surface and the second surface; The buckling restraint brace of claim 1 or 2, wherein the third surface faces the steel member and is positioned away from the steel member.

6. A core material extending in an axial direction; a plurality of plate-shaped steel members arranged along an outer peripheral surface of the core member and restraining buckling of the core member; and a piece of wood arranged on the opposite side of the core material with respect to the steel material, a connecting member that connects opposing portions of the plurality of steel materials that face each other on the outer side of the core material in a state in which relative movement is restricted, the wooden piece is fixed to the plurality of steel materials by the connecting member, The steel material has a first plate portion extending in a first orthogonal direction orthogonal to the axial direction in an axially orthogonal cross section of the core material, and a second plate portion extending in a second orthogonal direction orthogonal to the axial direction and the first orthogonal direction in an axially orthogonal cross section of the core material, the wooden piece has a first surface in contact with the first board portion, a second surface in contact with the second board portion, and a third surface connecting the first surface and the second surface; The third surface is a surface facing the steel member and positioned away from the steel member.

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