Buckling Restrained Brace

Abstract

To provide a buckling restrained brace capable of reliably restraining the buckling of a core material and improving manufacturability. [Solution] The buckling restraint brace is a buckling restraint brace that is attached to a structure and comprises a core material that includes non-plasticized portions at both ends and a plasticized portion in the center, a stress transmission material that closely surrounds the core material, and a global buckling restraint material that surrounds at least a portion of the stress transmission material, wherein the global buckling restraint material is not a steel pipe.

Description

[Technical Field]

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

[0002] As a buckling restraint brace, for example, one that uses wood for improved design is known (see, for example, Patent Document 1). The buckling restrained brace of Patent Document 1 includes a plate-shaped steel core member and a wooden buckling restraint member that restrains the buckling of the core member. The buckling restraint material comprises a first wooden restraint material that is positioned on a first side of the core material in the thickness direction and in close contact with the core material, and a second wooden restraint material that is positioned on a second side of the core material in the thickness direction and in close contact with the core material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-096172 Summary of the Invention [Problem to be solved by the invention]

[0004] When restraining the buckling of a core material using a buckling restraint material that is not a steel pipe, such as a wooden buckling restraint material, if the core material is directly surrounded by the buckling restraint material, when a compressive force is applied to the core material due to an earthquake or other event, the core material may sink into the buckling restraint material, making it difficult to restrain the buckling of the core material. Furthermore, in order to eliminate gaps between the buckling restraint material and the core material, the core material and / or the buckling restraint material must be machined with high precision, which poses a problem in terms of manufacturability.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a buckling restraint brace that can reliably restrain buckling of the core material and improve manufacturability. [Means for solving the problem]

[0006] A buckling restraint brace according to one aspect of the present disclosure is a buckling restraint brace that is attached to a structure and comprises a core material that includes non-plasticized portions at both ends and a plasticized portion in the center, a stress transmission material that closely surrounds the core material, and a global buckling restraint material that surrounds at least a portion of the stress transmission material, wherein the global buckling restraint material is not a steel pipe. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to provide a buckling restrained brace that can reliably restrain buckling of a core material and improve manufacturability. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 illustrates a front view of a buckling restrained brace according to one embodiment. [Figure 2] FIG. 1 illustrates a longitudinal cross-section of a buckling restrained brace according to one embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along line VV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a buckling restrained brace 1 according to one embodiment of the present disclosure will be described with reference to the drawings. The buckling restraint brace 1 is attached to a structure such as a building, for example. In this way, the buckling restrained brace 1 reinforces the structure.

[0010] FIG. 1 is a front view of a buckling restrained brace 1. FIG. 2 is a cross-sectional view of the buckling restrained brace 1 taken along its longitudinal direction. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. As shown in Figures 1 and 2, the buckling restrained brace 1 comprises a core material 10, stress transmission materials 20, global buckling restraint materials 30, end buckling restraint materials 40, and unbonded materials 50 (see Figure 2).

[0011] Hereinafter, when describing each direction in the buckling restrained brace 1, the longitudinal direction of the core material 10 will be referred to as the longitudinal direction Z. A direction perpendicular to the longitudinal direction Z is referred to as a first perpendicular direction X. The direction perpendicular to both the longitudinal direction Z and the first orthogonal direction X is referred to as the second orthogonal direction Y.

[0012] The core material 10 is attached at both ends in the longitudinal direction Z to the structure of a building, for example as a brace, thereby reinforcing the building. Although details will be described later, the core material 10 includes a plasticized portion 10a located in the center in the longitudinal direction Z and non-plasticized portions 10b located at both ends in the longitudinal direction Z. The stress transmission material 20 closely surrounds the core material 10 . As shown in FIG. 2, in this embodiment, an unbond material 50 is provided between the core material 10 and the stress transmission material 20. In this disclosure, the phrase "the stress transmission material 20 is in close contact with the core material 10" also includes the case where an unbonded material 50 is provided between the stress transmission material 20 and the core material 10, and the stress transmission material 20 is in close contact with the core material 10 via the unbonded material 50. The global buckling restraint member 30 surrounds at least a portion of the end buckling restraint member 40 and the stress transmission member 20 . The end buckling restraint member 40 is provided at the end of the overall buckling restraint member 30 in the longitudinal direction Z, and surrounds the stress transmission material 20 in the portion overlapping with the non-plasticized portion 10b. In the present disclosure, the central portion includes the center and the vicinity of the center.

[0013] The following describes the details of each component of the buckling restrained brace 1.

[0014] The core 10 includes a main core 11 and a secondary core 12 . The main core material 11 is a flat plate made of steel. The secondary core member 12 is a plate-like member made of a steel plate. The secondary core members 12 are arranged vertically on both side surfaces of the main core member 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. The first orthogonal direction X is the width direction of the main core material 11 and the thickness direction of the secondary core material 12 . The second orthogonal direction Y is the thickness direction of the main core material 11 and the width direction of the secondary core material 12.

[0015] As shown in FIG. 2, the main core 11 includes a first narrow width portion 11a, a first wide width portion 11b, a first width varying portion 11c, and a first end portion 11d.

[0016] The first narrow portion 11a is located in the center of the main core 11 in the longitudinal direction Z. The first wide portions 11b are located at both ends of the main core 11 in the longitudinal direction Z. The first wide portion 11b is wider than the first narrow portion 11a. That is, the plate width of the first wide portion 11b is greater than the plate width of the first narrow portion 11a. The length in the longitudinal direction Z of the first wide width portion 11b is shorter than the length in the longitudinal direction Z of the first narrow width portion 11a. Since the central portion of the main core material 11 in the longitudinal direction Z is the first narrow width portion 11a and both end portions in the longitudinal direction Z are the first wide width portions 11b, the central portion of the main core material 11 in the longitudinal direction Z (first narrow width portion 11a) becomes a region that is easily plasticized (i.e., a plasticized portion), and the plasticized portion is limited to the central portion. 1 and 2, the width of the first end portion 11d is larger than the width of the first wide portion 11b, but the present disclosure is not limited to this. The width of the first end portion 11d may be approximately the same as the width of the first wide portion 11b.

[0017] The first width varying portion 11c is a boundary region between the first wide width portion 11b and the first narrow width portion 11a. The plate width of the first width varying portion 11c varies along the longitudinal direction Z. The width of the first width varying portion 11c increases from the center of the main core material 11 in the longitudinal direction Z (i.e., the first narrow width portion 11a side) toward the end of the main core material 11 in the longitudinal direction Z (i.e., the first wide width portion 11b side). The first width-varying portion 11c absorbs, for example, an additional bending moment acting on the main core material 11.

[0018] The secondary cores 12 are provided on the front and back surfaces of the main core 11 . The secondary core material 12 is joined to the main core material 11 in a position perpendicular to the main core material 11 at the center of the main core material 11 in the first orthogonal direction X (the width direction of the main core material 11). The secondary core material 12 is joined to the primary core material 11 by, for example, welding. In this embodiment, the secondary core 12 is provided over the entire area of ​​the main core 11 in the longitudinal direction Z. That is, the cross section of the core material 10 perpendicular to the longitudinal direction Z is in the shape of a cross over the entire area in the longitudinal direction Z. However, the present disclosure is not limited to this, and by arranging the secondary core material 12 in a portion of the longitudinal direction Z of the main core material 11, a portion of the cross section of the core material 10 perpendicular to the longitudinal direction Z may exhibit a - (minus) shape.

[0019] The secondary core 12 includes a second narrow width portion 12a, a second wide width portion 12b, a second width varying portion 12c, and a second end portion 12d.

[0020] The second narrow portion 12a is located at the center of the secondary core 12 in the longitudinal direction Z. The second wide portions 12b are located at both ends of the secondary core 12 in the longitudinal direction Z. Although not specifically shown in the drawings, the second wide portion 12b is wider than the second narrow portion 12a. That is, the plate width of the second wide portion 12b is greater than the plate width of the second narrow portion 12a. The length in the longitudinal direction Z of the second wide width portion 12b is shorter than the length in the longitudinal direction Z of the second narrow width portion 12a. The length of the second narrow portion 12a in the longitudinal direction Z is equal to the length of the first narrow portion 11a in the longitudinal direction Z. Since the central portion of the secondary core material 12 in the longitudinal direction Z is the second narrow width portion 12a and the end portion in the longitudinal direction Z is the second wide width portion 12b, the central portion of the secondary core material 12 in the longitudinal direction Z (second narrow width portion 12a) becomes an area that is easily plasticized, and the plasticized portion is limited to the central portion. 1 and 2, the width of the second end portion 12d is larger than the width of the second wide portion 12b, but the present disclosure is not limited to this. The width of the second end portion 12d may be approximately the same as the width of the second wide portion 12b.

[0021] The second width varying portion 12c is a boundary region between the second wide width portion 12b and the second narrow width portion 12a. The plate width of the second width varying portion 12c varies along the longitudinal direction Z. The width of the second width varying portion 12c increases from the center of the secondary core 12 in the longitudinal direction Z (i.e., the second narrow width portion 12a side) toward the end of the secondary core 12 in the longitudinal direction Z (i.e., the second wide width portion 12b side). The second width-changing portion 12c absorbs, for example, an additional bending moment acting on the secondary core 12.

[0022] The plasticized portion 10 a of the core material 10 is composed of a first narrow portion 11 a of the main core material 11 and a second narrow portion 12 a of the secondary core material 12 . In this embodiment, as shown in FIG. 3, the plasticized portion 10a of the core material 10 has a cross-shaped cross section perpendicular to the longitudinal direction Z. However, the present disclosure is not limited to this, and the plasticized portion 10a of the core material 10 may have a cross section perpendicular to the longitudinal direction Z that is partially shaped like a minus sign (-).

[0023] The non-plasticized portion 10 b of the core material 10 is composed of a first wide portion 11 b of the main core material 11 and a second wide portion 12 b of the secondary core material 12 . The non-plasticized portion 10b is wider than the plasticized portion 10a. Furthermore, the non-plasticized portion 10b of the core material 10 is provided with a bolt hole 10b1. The buckling restrained brace 1 is attached to a structure by bolts (not shown) inserted into the bolt holes 10b1.

[0024] Furthermore, in the core material 10, a width varying portion 10c is provided between the plasticized portion 10a and the non-plasticized portion 10b, the width of which increases from the plasticized portion 10a side toward the non-plasticized portion 10b side. The width varying portion 10c is composed of a first width varying portion 11c of the main core 11 and a second width varying portion 12c of the secondary core 12. The width varying portion 10c is provided in a region that overlaps with the end buckling restraint member 40 in the longitudinal direction Z. That is, the core material 10 is widened in the region where it overlaps with the end buckling restraint material 40 in the longitudinal direction Z.

[0025] The global buckling restraint member 30 is cylindrical. The global buckling restraint member 30 is not a steel pipe. The overall buckling restraint member 30 is a wooden tubular member. In this disclosure, when a component is "wooden," it includes cases where the component is made of wood (is made of wood), cases where the component is made of a laminated material made by laminating wood and calcium silicate board, and cases where the component is made of a combination of the above. Furthermore, as the wood, so-called engineered wood may be used, or solid wood may be used. Engineered wood is a wood product made from wood that has been secondarily processed in a factory, with its strength properties calculated, evaluated, and guaranteed.

[0026] As shown in FIG. 1, the overall buckling restraint member 30 surrounds the outer periphery of the core member 10 . The length of the overall buckling restraint member 30 along the longitudinal direction Z is shorter than the length of the entire core material 10 along the longitudinal direction Z. The length of the overall buckling restraint member 30 along the longitudinal direction Z is longer than the length of the plasticized portion 10a of the core material 10 along the longitudinal direction Z. As a result, the non-plasticized portion 10 b of the core material 10 protrudes outward from the overall buckling restraint member 30 . The global buckling restraint member 30 restrains, for example, at least the global buckling of the core material 10 . In this embodiment, the overall buckling of the core material 10 means that the entire core material 10 is deformed in response to an external input.

[0027] The overall buckling restraint member 30 covers the stress transmission members 20 and the end buckling restraint members 40 . As shown in Figure 3, in the region where the end buckling restraint member 40 is provided, the end buckling restraint member 40 is arranged between the stress transmission member 20 and the overall buckling restraint member 30, and the inner surface of the overall buckling restraint member 30 is in contact with the outer surface of the end buckling restraint member 40. As shown in FIG. 4, in the region where the end buckling restraint member 40 is not provided, the inner surface of the overall buckling restraint member 30 is in contact with the stress transmission member 20 . For corrosion prevention, it is preferable that a water-repellent treatment be applied at least between the overall buckling restraint member 30 and the stress transmission member 20 .

[0028] In this embodiment, the global buckling restraint member 30 is a wooden rectangular tubular member, and has a pair of first wooden boards 31 and a pair of second wooden boards 32, as shown in FIGS.

[0029] The first wooden board 31 is a plate-like member whose board surface extends along the longitudinal direction Z and the second orthogonal direction Y. The pair of first wooden boards 31 are disposed so as to sandwich the core material 10 and the stress transmission material 20 in the first orthogonal direction X. In a cross section perpendicular to the longitudinal direction Z, both ends of the first wooden board 31 in the second orthogonal direction Y protrude further outward in the second orthogonal direction Y than the stress transmission members 20 . That is, the first wooden board 31 has a protruding portion 31a that protrudes outward in the second orthogonal direction Y beyond the stress transmission members 20. The protruding portions 31a are provided on both ends of the first wooden board 31 in the second orthogonal direction Y, respectively.

[0030] The second wooden board 32 is a plate-like member whose board surface extends along the longitudinal direction Z and the first orthogonal direction X. The pair of second wooden boards 32 are arranged to sandwich the core material 10 and the stress transmission material 20 in the second orthogonal direction Y. The second wooden board 32 is disposed between the protruding portions 31a of the pair of first wooden boards 31 in the first orthogonal direction X. An end of the second wooden board 32 in the first orthogonal direction X abuts against the protruding portion 31 a of the first wooden board 31 . At this contact portion, the first wooden board 31 and the second wooden board 32 are bonded together with an adhesive. The first wooden board 31 and the second wooden board 32 are fixed to each other by a fixing tool F1 such as a lag screw. The fixture F1 is provided so as to extend from the protruding portion 31a of the first wooden board 31 to the second wooden board 32. However, the present disclosure is not limited to this, and either the adhesive or the fastener may not be provided.

[0031] In addition, a pair of first wooden boards 31 may be arranged to sandwich the core material 10 and the stress transmission material 20 in the second orthogonal direction Y, and a pair of second wooden boards 32 may be arranged to sandwich the core material 10 and the stress transmission material 20 in the first orthogonal direction X. In this case, the first wooden board 31 has a protruding portion 31a that protrudes outward in the first orthogonal direction X beyond the stress transmission members 20. In this case, the second wooden board 32 is disposed between the protruding portions 31a of the pair of first wooden boards 31 in the second orthogonal direction Y.

[0032] The stress transmission member 20 is disposed between the core member 10 and the global buckling restraint member 30 . When a compressive force in the longitudinal direction Z is applied to the core material 10 due to an earthquake or the like, the stress generated in the core material 10 is transmitted to the overall buckling restraint member 30 via the stress transmission member 20. The stress transmission material 20 is made of, for example, concrete or mortar. The stress transmission material 20 is filled between the core material 10 and the global buckling restraint material 30 .

[0033] In a cross section perpendicular to the longitudinal direction Z, the stress transmission material 20 contacts the entire periphery of the core material 10 without any gaps. In this disclosure, the phrase "the stress transmission material 20 is in contact with the entire circumference of the core material 10 without any gaps" also includes the case where the unbonded material 50 is provided between the stress transmission material 20 and the core material 10, and the stress transmission material 20 is in contact with the entire circumference of the unbonded material 50 without any gaps, so that the stress transmission material 20 is in contact with the entire circumference of the core material 10 via the unbonded material 50 without any gaps.

[0034] The stress transmission material 20 is made of a material that is more rigid than wood. The rigidity of the stress transmission member 20 is higher than the rigidity of the global buckling restraint member 30 . The strength of the stress transmission member 20 is higher than the strength of the global buckling restraint member 30 . As a result, when a compressive force in the longitudinal direction Z is applied to the core material 10 due to an earthquake or the like, a force that tries to buckle is generated in the core material 10. However, by providing the stress transmission material 20, the stress caused by the force that tries to buckle generated in the core material 10 is reliably transmitted to the overall buckling restraint material 30 via the stress transmission material 20. Therefore, the core material 10 does not sink into the stress transmission material 20 , and the stress generated in the core material 10 can be reliably transmitted to the overall buckling restraint material 30 via the stress transmission material 20 . In the present disclosure, the term "rigidity" particularly refers to rigidity against a force in a direction perpendicular to the longitudinal direction Z. In the present disclosure, the term "proof strength" particularly refers to the proof strength against a force in a direction perpendicular to the longitudinal direction Z.

[0035] The unbonding material 50 is provided between the core material 10 and the stress transmission material 20 . The unbonding material 50 prevents the core material 10 and the stress transmission material 20 from adhering to each other. The unbonding material 50 allows the core material 10 and the stress transmission material 20 to move relative to each other. In this way, the unbond material 50 restricts the core material 10 and the stress transmission material 20 from moving together in the longitudinal direction Z. As a result, the stress transmission material 20 holds the core material 10 so that the axial force of the core material 10 is not transmitted to the overall buckling restraint material 30, i.e., so that the core material 10 can move relative to the overall buckling restraint material 30 in the longitudinal direction Z.

[0036] As shown in FIG. 2, the plasticized portion 10a of the core material 10 is provided with a displacement prevention protrusion 51 (displacement prevention). The anti-slip protrusion 51 is provided to prevent the amount of misalignment between the core material 10 and the overall buckling restraint material 30 (the amount of relative movement of the core material 10 with respect to the overall buckling restraint material 30) from becoming equal at both ends in the longitudinal direction Z due to the influence of the buckling restraint brace 1's own weight, etc. The anti-slip projection 51 is provided at the center of the core material 10 in the longitudinal direction Z. The displacement prevention projections 51 are provided, for example, on both sides of the main core material 11 in the first orthogonal direction X (ie, the width direction of the main core material 11). The displacement prevention projections 51 project outward in the first orthogonal direction X from the side surfaces of the main core material 11 facing the first orthogonal direction X. The anti-slip projections 51 may be provided on both sides of the secondary core 12 in the second orthogonal direction Y (ie, the width direction of the secondary core 12). The material of the anti-slip projections 51 can be the same as the material of the core material 10 . The anti-slip projection 51 is formed integrally with the core material 10 .

[0037] The displacement prevention projections 51 are covered with the stress transmission material 20 . The anti-slip projections 51 are not covered by the unbond material 50 . That is, the displacement prevention projection 51 is exposed from the unbond material 50 . The displacement prevention projections 51 are in direct contact with the stress transmission material 20 and are in close contact with the stress transmission material 20 . The displacement prevention projections 51 cannot move relative to the stress transmission material 20 . As a result, the anti-slip projections 51 prevent the core material 10 from being displaced relative to the stress transmission material 20 at the center of the core material 10 .

[0038] Additionally, cushioning materials 52 and 53 are provided in width-changing portion 10c of core material 10 (near the boundary between plasticized portion 10a and non-plasticized portion 10b). The cushioning material 52 is provided in the first width varying portion 11c of the main core material 11. The cushion material 52 is disposed between the first width varying portion 11c and the stress transmission material 20. The cushion material 52 is disposed adjacent to the first width varying portion 11c in the longitudinal direction Z. The cushioning material 53 is provided in the second width varying portion 12c of the secondary core 12. The cushion material 53 is disposed between the second width varying portion 12c and the stress transmission material 20. The cushion material 53 is disposed adjacent to the second width varying portion 12c in the longitudinal direction Z. When a compressive force in the longitudinal direction Z is applied to the core material 10 due to an earthquake or the like, the first width-changing portion 11c and the second width-changing portion 12c are displaced toward the center of the core material 10 in the longitudinal direction Z. At this time, cushion material 52 is pressed by first width-changing portion 11c and contracts, absorbing the displacement of first width-changing portion 11c. The cushion material 53 is pressed by the second width-changing portion 12c and contracts, absorbing the displacement of the second width-changing portion 12c. This prevents interference between the first width-changing portion 11c and the second width-changing portion 12c and the stress transmission material 20, thereby preventing damage to the core material 10 and the axial force of the core material 10 from being transmitted to the stress transmission material 20.

[0039] As shown in FIG. 1, a wooden lid 33 is provided at each end of the overall buckling restraint member 30 in the longitudinal direction Z. The wooden lids 33 are provided to close the openings at both ends of the overall buckling restraint member 30 . The wooden lid 33 abuts against the end of the overall buckling restraint member 30 in the longitudinal direction Z (hereinafter also simply referred to as the end of the overall buckling restraint member 30). The wooden lid 33 is adhered to the end of the overall buckling restraint member 30 with an adhesive. The wooden lid 33 is fixed to the end of the overall buckling restraint member 30 by a fixing tool F2 such as a lag screw. However, the present disclosure is not limited to this, and either the adhesive or the fastener may not be provided. The wooden lid 33 reinforces the end portion of the overall buckling restraint member 30 .

[0040] As shown in FIG. 5, in a cross section perpendicular to the longitudinal direction Z, the wooden lid 33 is provided so as to surround the outer shape of the non-plasticized portion 10b of the core material 10. The wooden lid 33 is divided into a first member 33a and a second member 33b. That is, the wooden lid 33 is composed of a first member 33a and a second member 33b. The first member 33a and the second member 33b may have the same shape. The first member 33a and the second member 33b are respectively formed with recesses 33a1 and 33b1 that correspond to the outer shape of the non-plastic portion 10b. The wooden lid 33 is divided into the first member 33a and the second member 33b, which makes it easy to install the wooden lid 33. To allow the core material 10 and the wooden lid 33 to move relative to each other, a gap is formed between the core material 10 and the wooden lid 33 (recesses 33a1, 33b1). An unbonding material 50 may be provided between the core material 10 and the wooden lid 33 (recesses 33a1, 33b1).

[0041] In the illustrated example, the wooden lid 33 is divided into two members: a first member 33a and a second member 33b. However, the wooden lid 33 may be divided into three or more members. Furthermore, the first member 33a and the second member 33b do not have to have the same shape. The wooden lid 33 may also be formed from a single member. However, the present disclosure is not limited to this, and the wooden lid 33 does not have to be provided.

[0042] The end buckling restraint member 40 is cylindrical. The end buckling restraint member 40 is, for example, a steel pipe. In this embodiment, the end buckling restraint member 40 is a square tubular member made of steel. The end buckling restraint material 40 has higher rigidity than wood. The rigidity of the end buckling restraint member 40 is higher than the rigidity of the overall buckling restraint member 30 . The end buckling restraint member 40 has a higher strength than the overall buckling restraint member 30 .

[0043] As shown in FIGS. 1 and 2, the end buckling restraint members 40 are provided at both ends in the longitudinal direction Z of the overall buckling restraint member 30 . The end buckling restraint member 40 covers the outer periphery of the non-plasticized portion 10b and the width-changing portion 10c of the core material 10. The end buckling restraint member 40 surrounds the stress transmission member 20 in the portion that overlaps with the non-plasticized portion 10b and the width-changing portion 10c of the core member 10.

[0044] The end buckling restraint member 40 is provided inside the overall buckling restraint member 30 . The outer surface of the end buckling restraint member 40 abuts against the inner surface of the overall buckling restraint member 30 . The outer surface of the end buckling restraint member 40 is bonded to the inner surface of the overall buckling restraint member 30 with an adhesive. That is, the end buckling restraint member 40 and the overall buckling restraint member 30 are fixed to each other and integrated.

[0045] The end buckling restraint member 40 reinforces the end of the overall buckling restraint member 30 . In addition, the end buckling restraint members 40 restrain local buckling of the core material 10 . In this embodiment, local buckling of the core material 10 refers to local deformation of the core material 10 when a compressive force is applied to the core material 10 in the longitudinal direction Z. Specifically, in the buckling restrained brace 1, a force acts on the end of the global buckling restraint member 30, causing the core member 10 to bend. By providing the end buckling restraint member 40 at the end of the overall buckling restraint member 30, local buckling (neck-breaking buckling) of the core material 10 at the end of the overall buckling restraint member 30 can be suppressed. The end buckling restraint member 40 surrounds the stress transmission member 20 at the portion overlapping the non-plastic portion 10b, thereby making it possible to suppress local buckling of the non-plastic portion 10b of the core material 10. Furthermore, the end buckling restraint member 40 surrounds the stress transmission member 20 at the portion overlapping the width varying portion 10c, thereby making it possible to suppress local buckling of the width varying portion 10c of the core member 10. The end buckling restraint member 40 may have a shorter length in the longitudinal direction Z than in the illustrated example, and may not surround the stress transmission member 20 in the portion overlapping with the width varying portion 10c.

[0046] As described above, the buckling restraint brace 1 of this embodiment comprises a core material 10 including non-plasticized portions 10b at both ends and a plasticized portion 10a in the center, a stress transmission material 20 that closely surrounds the core material 10, and an overall buckling restraint material 30 that surrounds at least a portion of the stress transmission material 20. The global buckling restraint member 30 is not a steel pipe. In the past, when restraining the buckling of a core material using a global buckling restraint material that is not a steel pipe, such as a wooden global buckling restraint material, if the core material was directly surrounded by the global buckling restraint material, when a compressive force was applied to the core material due to an earthquake or the like, the core material would sink into the global buckling restraint material, making it difficult to restrain the buckling of the core material. Furthermore, in the past, such a configuration required high-precision processing of the core material and / or the overall buckling restraint material to eliminate gaps between the overall buckling restraint material and the core material, which posed a problem in terms of manufacturability. In this embodiment, the buckling restrained brace 1 includes stress transmission members 20 that closely surround the core member 10 , and a total buckling restraint member 30 that surrounds at least a portion of the stress transmission members 20 . According to this configuration, when a compressive force is applied to the core material 10 due to an earthquake or the like, the stress generated in the core material 10 is transmitted to the overall buckling restraint member 30 via the stress transmission member 20. Therefore, even if the overall buckling restraint member 30 is not a steel pipe, the core material 10 will not sink into the overall buckling restraint member 30, and the buckling of the core material 10 can be reliably restrained. Furthermore, since the stress transmission material 20 is provided, there is no need to process the core material 10 and the overall buckling restraint material 30 with high precision, compared to when the core material is directly surrounded by the overall buckling restraint material, which makes it possible to improve manufacturability. As described above, the buckling restrained brace 1 having the above configuration can reliably restrain the buckling of the core material 10 and also improve manufacturability.

[0047] The buckling restrained brace 1 may further include end buckling restraint members 40 that are surrounded by the overall buckling restraint member 30 and surround the stress transmission members 20 in the portions that overlap the non-plasticized portions 10b. According to the above configuration, by providing the end buckling restraint member 40, local buckling (for example, neck buckling) of the non-plasticized portion 10b of the core material 10 can be suppressed.

[0048] In addition, it is preferable that the rigidity of the stress transmission members 20 is higher than the rigidity of the overall buckling restraint member 30 , and the rigidity of the end buckling restraint members 40 is higher than the rigidity of the overall buckling restraint member 30 . In addition, it is preferable that the yield strength of the stress transmission member 20 is higher than the yield strength of the overall buckling restraint member 30 , and that the yield strength of the end buckling restraint member 40 is higher than the yield strength of the overall buckling restraint member 30 . According to the above configuration, it is possible to more effectively suppress the overall buckling of the core material 10 by the overall buckling restraint member 30 and suppress the local buckling of the core material 10 by the end buckling restraint member 40.

[0049] The material of the stress transmission material 20 is preferably mortar or concrete. According to the above-described configuration, the stress transmission material 20 can be easily and reliably brought into close contact with the core material 10 .

[0050] In addition, the end buckling restraint members 40 may be provided at both ends of the overall buckling restraint member 30 . According to the above configuration, local buckling (neck-breaking buckling) of the non-plasticized portion 10b of the core material 10 at the end of the overall buckling restraint member 30 can be more effectively suppressed.

[0051] Moreover, the overall buckling restraint member 30 is preferably a wooden rectangular tubular member. According to the above configuration, the design of the buckling restrained brace 1 can be improved.

[0052] In addition, the non-plasticized portion 10b of the core material 10 may be wider than the plasticized portion 10a of the core material 10. According to the above configuration, only the plasticized portion 10a of the core material 10 can be plastically deformed more reliably, and the buckling-restrained brace 1 can more reliably exhibit its earthquake resistance and vibration-damping performance.

[0053] The buckling restrained brace 1 may further include end buckling restraint members 40 that are surrounded by the overall buckling restraint member 30 and surround the stress transmission members 20 in the portions that overlap the non-plasticized portions 10b. The core material 10 may be widened in the area where it overlaps with the end buckling restraint material 40 . According to the above configuration, by providing the end buckling restraint member 40, local buckling of the non-plasticized portion 10b of the core material 10 and the portion where the width is increased (the width-changing portion 10c) can be suppressed.

[0054] In addition, cushioning materials 52 and 53 may be provided near the boundary between the non-plasticized portion 10b and the plasticized portion 10a. According to the above configuration, when a compressive force in the longitudinal direction Z is applied to the core material 10 due to an earthquake or the like, interference between the area near the boundary in the core material 10 and the stress transmission material 20 can be suppressed, thereby preventing damage to the core material 10 and the axial force of the core material 10 from being transmitted to the stress transmission material 20.

[0055] Furthermore, in a cross section perpendicular to the longitudinal direction Z, the overall buckling restraint material 30 preferably comprises a pair of first wooden boards 31 protruding further than the stress transmission material 20, and a pair of second wooden boards 32 arranged between the protruding portions (protruding portions 31a) of the pair of first wooden boards 31. According to the above configuration, the global buckling restraint member 30 can be easily formed, and manufacturability is further improved.

[0056] Furthermore, a fastener F1 that extends from the first wooden board 31 to the second wooden board 32 may be provided on the protruding portion (protruding portion 31a). According to the above configuration, the first wooden board 31 and the second wooden board 32 can be securely fixed together.

[0057] In addition, the plasticized portion 10a may be provided with a displacement prevention protrusion 51 (displacement prevention device) that comes into close contact with the stress transmission material 20. According to the above configuration, it is possible to prevent the core material 10 from shifting in position relative to the stress transmission material 20 in the plasticized portion 10a, and it is possible to prevent the amount of shift between the core material 10 and the overall buckling restraint material 30 from being equal at both ends in the longitudinal direction Z due to the influence of the weight of the buckling restraint brace 1, etc.

[0058] In addition, the overall buckling restraint member 30 may be provided with a wooden lid 33 . According to the above configuration, the overall buckling restrained member 30 can be reinforced by the wooden lid 33 while maintaining the design of the buckling restrained brace 1.

[0059] In addition, the core material 10 may have a cross shape in a cross section perpendicular to the longitudinal direction Z. According to the above-described configuration, the yield strength of the core material 10 can be improved compared to when the core material is formed from a single plate-like member, for example.

[0060] 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.

[0061] For example, if the overall buckling restraint member 30 can suppress local buckling (neck-breaking buckling) of the core material 10, the end buckling restraint member 40 does not need to be provided.

[0062] Moreover, the overall buckling restraint member 30 and the end buckling restraint member 40 may be cylindrical members.

[0063] The secondary core 12 does not necessarily have to be provided in the first narrow portion 11a of the main core 11. In this case, the plasticized portion 10a of the core material 10 is formed by the first narrow portion 11a of the main core material 11, and the cross section perpendicular to the longitudinal direction Z has a minus sign shape.

[0064] 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.

[0065] (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 that is attached to a structure and comprises a core material that includes non-plasticized portions at both ends and a plasticized portion in the center, a stress transmission material that closely surrounds the core material, and a global buckling restraint material that surrounds at least a portion of the stress transmission material, wherein the global buckling restraint material is not a steel pipe. According to the above configuration, when a compressive force is applied to the core material due to an earthquake or the like, the stress generated in the core material is transmitted to the overall buckling restraint material via the stress transmission material. Therefore, even if the overall buckling restraint member is not a steel pipe, the core material will not sink into the overall buckling restraint member, and buckling of the core material can be reliably restrained. Furthermore, since a stress transmission material is provided, there is no need to process the core material and the overall buckling restraint material with high precision, compared to when the core material is directly surrounded by the overall buckling restraint material, which makes it possible to improve manufacturability. As described above, a buckling restrained brace having the above configuration can reliably restrain the buckling of the core material and also improve manufacturability.

[0066] <2> the above <1> The buckling restrained brace according to the above aspect may further include an end buckling restraint member that is surrounded by the overall buckling restraint member and surrounds the stress transmission member in a portion that overlaps with the non-plasticized portion. According to the above configuration, by providing the end buckling restraint member, local buckling (for example, neck buckling) of the non-plasticized portion of the core material can be suppressed.

[0067] <3> the above <2> In the buckling restrained brace according to the above, the stiffness of the stress transmission material may be higher than the stiffness of the overall buckling restraint material, and the stiffness of the end buckling restraint material may be higher than the stiffness of the overall buckling restraint material. According to the above configuration, it is possible to more effectively suppress the overall buckling of the core material by the overall buckling restraint member and suppress the local buckling of the core material by the end buckling restraint member.

[0068] <4> the above <2> or <3> In the buckling restraint brace according to the present invention, the strength of the stress transmission member may be higher than the strength of the overall buckling restraint member, and the strength of the end buckling restraint member may be higher than the strength of the overall buckling restraint member. According to the above configuration, it is possible to more effectively suppress the overall buckling of the core material by the overall buckling restraint member and suppress the local buckling of the core material by the end buckling restraint member.

[0069] <5> the above <1> from <4> In the buckling restrained brace according to any one of the above, the material of the stress transmission material may be mortar or concrete. According to the above configuration, the stress transmission material can be easily and reliably brought into close contact with the core material.

[0070] <6> the above <2> In the buckling restrained brace according to the present invention, the end buckling restraint members may be provided at both ends of the overall buckling restraint member. According to the above configuration, local buckling (neck-breaking buckling) of the non-plasticized portion of the core material at both ends of the overall buckling restraint member can be more effectively suppressed.

[0071] <7> the above <1> from <6> In the buckling restrained brace according to any one of the above, the global buckling restraint member may be a wooden rectangular tubular member. According to the above configuration, the design of the buckling restraint brace can be improved.

[0072] <8> the above <1> from <7> In the buckling restrained brace according to any one of the above, the non-plasticized portion of the core material may be wider than the plasticized portion of the core material. According to the above configuration, only the plasticized portion of the core material can be plastically deformed more reliably, and the earthquake resistance and vibration control performance of the buckling restrained brace can be more reliably exhibited.

[0073] <9> the above <8> The buckling restraint brace according to the present invention may further include an end buckling restraint material that is surrounded by the overall buckling restraint material and surrounds the stress transmission material in a portion that overlaps with the non-plasticized portion, and the core material may be widened in the region that overlaps with the end buckling restraint material. According to the above configuration, by providing the end buckling restraint member, local buckling of the non-plasticized portion of the core material and the widened portion can be suppressed.

[0074] <10> the above <8> or <9> In the buckling restraint brace according to the above, a cushioning material may be provided near the boundary between the non-plasticized portion and the plasticized portion. According to the above configuration, when a compressive force in the longitudinal direction Z is applied to the core material due to an earthquake or the like, interference between the area near the boundary in the core material and the stress transmission material can be suppressed, thereby preventing damage to the core material and the axial force of the core material from being transmitted to the stress transmission material.

[0075] <11> the above <1> from <10> In a buckling restraint brace according to any one of the above, in a cross section perpendicular to the longitudinal direction, the overall buckling restraint material may comprise a pair of first wooden boards protruding beyond the stress transmission material, and a pair of second wooden boards arranged between the protruding portions of the pair of first wooden boards. According to the above configuration, the overall buckling restraint member can be easily formed, and manufacturability is further improved.

[0076] <12> the above <11> In the buckling restraint brace according to the above, a fastener may be provided in the protruding portion, extending from the first wooden board to the second wooden board. According to the above configuration, the first wooden board and the second wooden board can be reliably fixed together.

[0077] <13> the above <1> from <12> In the buckling restrained brace according to any one of the above, the plasticized portion may be provided with a shear stop that is in close contact with the stress transmission material. According to the above configuration, it is possible to prevent the core material from shifting in position relative to the stress transmission material in the plasticized portion, and to prevent the amount of shift between the core material and the overall buckling restraint material from being equal at both ends in the longitudinal direction Z due to the influence of the buckling restraint brace 1's own weight, etc.

[0078] <14> the above <1> from <13> In the buckling restrained brace according to any one of the above, the overall buckling restraint member may be provided with a wooden cover. According to the above configuration, the overall buckling restraint material can be reinforced by the wooden lid while maintaining the design of the buckling restraint brace. Furthermore, for example, when the stress transmission material is made of mortar or concrete, leakage of the stress transmission material from the global buckling restraint material can be suppressed.

[0079] <15> the above <1> from <14> In the buckling restraint brace according to any one of the above, the core material may be cross-shaped in a cross section perpendicular to the longitudinal direction. According to the above-described configuration, the yield strength of the core material can be improved compared to when the core material is formed from a single plate-like member, for example. [Explanation of symbols]

[0080] 1. Buckling-restrained brace 10 Core material 10a Plasticization section 10b Non-plasticized part 10c Width change section 11 Main core material 11a 1st narrow part 11b First wide section 11c First width change section 11d 1st end 12 Secondary core material 12a 2nd narrow part 12b Second wide section 12c Second width change section 12d 2nd end 20 Stress transfer material 30 Global buckling restraint material 31 First Wooden Board 31a Projecting part 32 Second wooden board 33 Wooden lid 40 End buckling restraint material 50 Unbonded material 51 Anti-slip protrusion (anti-slip) 52, 53 Cushioning material F1, F2 fixings X First orthogonal direction Y Second orthogonal direction Z longitudinal direction

Claims

1. A buckling restrained brace attached to a structure, comprising: a core material including non-plasticized portions at both ends and a plasticized portion at the center; a stress transmission material closely surrounding the core material; a total buckling restraint material surrounding at least a portion of the stress transmission material; Equipped with The entire buckling-restrained brace is made of wood, not steel pipe.

2. The buckling restrained brace according to claim 1 , further comprising an end buckling restraint member that is surrounded by the overall buckling restraint member and surrounds the stress transfer material in a portion that overlaps with the non-plasticized portion.

3. the rigidity of the stress transmission material is higher than the rigidity of the global buckling restraint material, The buckling restrained brace of claim 2 , wherein the stiffness of the end buckling restraint members is greater than the stiffness of the global buckling restraint member.

4. The yield strength of the stress transmission material is higher than the yield strength of the global buckling restraint material, The buckling restrained brace according to claim 2 , wherein the end buckling restraint members have a higher strength than the overall buckling restraint members.

5. The buckling restraint brace according to any one of claims 1 to 4, wherein the stress transfer material is mortar or concrete.

6. The buckling restrained brace according to claim 2 , wherein the end buckling restraint members are provided at both ends of the overall buckling restraint member.

7. The buckling restraint brace according to any one of claims 1 to 4, wherein the overall buckling restraint member is a rectangular tubular member.

8. The buckling restraint brace according to any one of claims 1 to 4, wherein the non-plasticized portion of the core material is wider than the plasticized portion of the core material.

9. an end buckling restraint member that is surrounded by the overall buckling restraint member and surrounds the stress transmission material in a portion that overlaps with the non-plasticized portion; The buckling restrained brace of claim 8 , wherein the core is widened in areas that overlap the end buckling restraints.

10. The buckling restraint brace according to claim 8 , wherein a cushioning material is provided near the boundary between the non-plasticized portion and the plasticized portion.

11. In a cross section perpendicular to the longitudinal direction, the global buckling restraint member has A pair of first wooden boards protruding from the stress transmission material; a pair of second wooden boards arranged between the protruding portions of the pair of first wooden boards; 5. The buckling restrained brace of claim 1, comprising:

12. The buckling restrained brace of claim 11 , wherein a fastener is provided at the protruding portion, extending from the first wood plank to the second wood plank.

13. The buckling restraint brace according to any one of claims 1 to 4, wherein the plasticized portion is provided with a stopper that is in close contact with the stress transmission material.

14. The buckling restraint brace according to any one of claims 1 to 4, wherein the overall buckling restraint material is provided with a wooden cover.

15. The buckling restraint brace according to any one of claims 1 to 4, wherein the core material has a cross-shape in a cross section perpendicular to the longitudinal direction.

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