Buckling Restrained Brace

Abstract

To provide a buckling restraining brace that is suitable for use by being incorporated in a frame of a wooden building or the like, and is excellent in productivity.SOLUTION: A buckling restraining brace 100 includes: a core material 10 formed of steel and having a plate shape; and a wooden restraining material 20 formed by a pair of wooden restraining plates 21 and provided with, in corresponding positions of the restraining plates 21, a first recess 26 in which the core material 10 is stored. The core material 10 is stored in two first recesses 26 extending in an orthogonal direction with respect to a contact surface 25 of the pair of restraining plates 21.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a buckling-restrained brace. [Background technology]

[0002] Buckling-restrained braces, which have been designed to prevent buckling, have traditionally been used as braces to form building frames (column-beam frames, roof frames, etc.). Buckling-restrained braces come in a variety of stiffening configurations, including a steel core reinforced only with steel plates, a steel core reinforced with reinforced concrete (RC), and a steel core covered with steel and mortar.

[0003] Recently, efforts have been made to improve the fire resistance and earthquake resistance of wooden buildings (such as wooden houses, wooden warehouses, and wooden stadiums). Wooden houses inherently have advantages such as a high degree of freedom in floor plan and design, the soothing effect of natural wood, the humidity-regulating properties of wood, and generally lower construction costs compared to steel-framed or reinforced concrete structures, depending on the building's intended use (e.g., residential). However, the improved fire resistance and earthquake resistance are one factor driving increased interest in wooden buildings, including wooden houses. When incorporating the conventional buckling restrained braces described above into the frame of such a wooden house, wooden columns and beams are mixed with buckling restrained braces with metal or concrete stiffeners, resulting in an unbalanced appearance.

[0004] One possible solution is to cover the entire buckling restrained brace with a wooden or paper panel, making the metal or concrete stiffener invisible from the outside. However, this requires a great deal of work, which raises concerns about increased construction costs. Furthermore, conventional buckling restrained braces tend to be heavy because they use a lot of metal, concrete, mortar, etc., and installing heavy buckling restrained braces inside the lightweight wooden beams and columns that make up a wooden house is structurally unbalanced.

[0005] Patent Document 1 proposes a buckling restrained brace suitable for use within the framework of wooden buildings such as wooden houses. Specifically, this is a buckling restrained brace that has a core material and a pair of restraining members arranged along both sides of the core material, where the core material is made of steel and the pair of restraining members are made of wood, and the restraining members are made of laminated lumber, with the lamina stacked parallel to the core material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4901491 Summary of the Invention [Problem to be solved by the invention]

[0007] The buckling restraint brace described in Patent Document 1 requires processing laminated timber to create two wooden restraint members with L-shaped cross sections, then turning these upside down and connecting them with a core material in between, making the buckling restraint brace not easy to manufacture.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a buckling restraint brace that is suitable for use in being incorporated into the framework of a wooden building or the like and that is easy to manufacture. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the buckling restrained brace according to the present invention is as follows: A steel plate-shaped core material, a wooden restraint member formed of a pair of wooden restraint plates, each of which has a first recess in which the core material is housed at a corresponding position; The core material is housed in two of the first recesses that extend in a direction perpendicular to the contact surfaces of the pair of restraint plates.

[0010] According to this aspect, the core material is housed in two first recesses extending perpendicular to the contact surfaces of the pair of restraining plates. This allows the wooden restraining member to be manufactured using simple components, and the number of components is minimized, resulting in good manufacturability. Furthermore, the pair of restraining members are connected to form a wooden restraining member with a closed structure formed by four walls. Since the steel core material is surrounded by the wooden restraining members, even when the buckling restrained brace of this aspect is applied to the frame of a wooden building, it does not have an out-of-place appearance with the frame components. Here, the restraining plates may be made of solid wood or laminated lumber with laminated lamina.

[0011] In another aspect of the buckling restrained brace according to the present invention, The restraint plate has a plurality of laminas on the contact surface. Parallel It is characterized by being formed by laminating the sheets in a direction and bonding them together.

[0012] According to this aspect, the restraint plate has a plurality of laminas on the contact surface. Parallel Because the laminated wood is laminated in the direction of the core and glued together, for example, the strong axis of the core and the lamination direction of the lamina are perpendicular. Therefore, when bending acts in the strong axis direction of the core, the bonding surfaces of the lamina are located as close as possible to the neutral axis, improving the strength of the wooden restraint material against bending in the strong axis direction. Furthermore, because the weak axis direction of the core and the lamination direction of the lamina are parallel, when bending acts in the weak axis direction of the core, the lamina of each layer can resist bending in the weak axis direction. In particular, the outermost lamina, which are farthest from the neutral axis, can resist bending in the weak axis direction the most strongly.

[0013] Another aspect of the buckling restrained brace according to the present invention is: The pair of restraint plates are connected to each other at the contact surfaces via an adhesive.

[0014] According to this aspect, the pair of restraint plates are connected via adhesive, which further improves the manufacturability of the wooden restraint member.

[0015] Another aspect of the buckling restrained brace according to the present invention is: The wooden restraining material is made of a driven or screwed material, and is characterized in that a split prevention means for preventing the wooden restraining material from splitting is embedded from the side of one of the restraining plates to the other of the restraining plates.

[0016] According to this aspect, in addition to connecting the restraining plates with adhesive, the crack prevention means made of a driven or screwed material is embedded from the side of one restraining plate to the other (embedded by driving or screwing), which effectively prevents the restraining plates from cracking and further functions as a fail-safe to prevent the restraining plates from separating at their contact surfaces (adhesion interfaces) in the event of a major earthquake, etc. For example, it is preferable to embed the crack prevention means in a staggered pattern along the length of the wooden restraining member.

[0017] In another aspect of the buckling restrained brace according to the present invention, The first recess contains an unbonded material, and the gap between the first recess and the core material, which has a smaller cross-sectional dimension than the first recess, is blocked by the unbonded material.

[0018] According to this aspect, the gap between the first recess and the core material contained therein is blocked by the unbonded material, so that when a localized pressure force or the like acts from the core material on the wall surface of the first recess of the restraint plate due to a high-order buckling deformation of the core material, the pressure force or the like is absorbed by the deformable unbonded material, thereby preventing damage to the restraint plate due to this localized pressure force or the like.

[0019] Here, the unbonded material may be an elastic material with deformability such as butyl rubber, but from the viewpoint of sufficiently sealing the narrow gap between the first recess and the core material, it is preferable to use an unbonded material made of a mixture of lubricant and synthetic resin.

[0020] In another aspect of the buckling restrained brace according to the present invention, the core material is in the form of a plate having two wide surfaces and two narrow surfaces, and has a narrow portion at the center in the longitudinal direction where the wide surfaces are relatively narrow, and has wide portions at the end portions in the longitudinal direction where the wide surfaces are relatively wide, The narrow width portion is characterized by having a plasticized region that is most easily plasticized in the core material.

[0021] According to this aspect, the core material has a narrow width portion at the center of its longitudinal direction where the width of the wide surface is relatively narrow, and a wide width portion at the end of its longitudinal direction where the width of the wide surface is relatively wide, so that the narrow width portion at the center can be made into a plasticization region that is easy to plasticize, and this plasticization region can be limited to the narrow width portion at the center.

[0022] The boundary region between the wide and narrow sections of the core material is a transition region where the planar and cross-sectional areas of the core material change. Therefore, a plasticized region that is easily plasticized is formed on the narrow-section side of this transition region, and this transition region can absorb the additional bending moment acting on the core material. The additional bending moment (or simply, additional bending) refers to the bending moment that can act on the wooden restraint material due to large deformation of the frame and buckling-restrained brace, for example, during a major earthquake. In this manner, in this embodiment, the additional bending moment acting on the core material can be effectively absorbed by the narrow-section side of the boundary region between the wide and narrow sections of the core material.

[0023] The core material may have two or more wide portions whose width increases in multiple stages toward the end. For example, in a configuration having two wide portions, a plasticized region is formed in the region on the narrow portion side of the boundary region between the wide surface (relatively narrow wide portion) on the narrow portion side and the narrow portion.

[0024] In another aspect of the buckling restrained brace according to the present invention, a reinforcing rib orthogonal to the wide surface at the end of the core material in the longitudinal direction is joined to the wide surface, forming a cross-shaped cross section; a second recessed portion that does not interfere with the reinforcing rib is provided at a position of the end of the restraint plate that corresponds to the reinforcing rib, The abutment surface is characterized in that a portion of the reinforcing rib is housed in two corresponding second recesses.

[0025] According to this aspect, since the reinforcing ribs perpendicular to the wide faces of the core material are joined at the longitudinal ends of the core material, giving it a cross-shaped cross section, when the buckling restrained brace is attached to a gusset plate so that the wide faces of the core material are arranged parallel to the structural face of the building, the core material has reinforcing ribs perpendicular to the wide faces parallel to the structural face, which increases the rigidity of the end of the core material in the direction outward from the structural face.In the gusset plate of the structural face to which this cross-sectional core material is attached, fin stiffeners are attached to the gusset plate, and the core material of the buckling restrained brace and gusset plate, and the reinforcing ribs and fin stiffeners are each joined via splice plates using high-tension bolts or the like.

[0026] Furthermore, a second recess is provided at the end of the restraining plate at a position corresponding to the reinforcing rib so as not to interfere with the reinforcing rib, thereby preventing the end of the restraining plate from being pressed by the reinforcing rib and being damaged. A gap is provided between the reinforcing rib and the second recess, and this gap is desirably set to a length that can absorb the expansion and contraction of the core material when the core material expands and contracts in response to deformation of the structural face. The setting of this gap is left to the discretion of the designer, and the amount of expansion and contraction of the core material is calculated based on the set inter-story deformation angle. For example, the gap is set to be equal to or greater than the amount of expansion and contraction of the core material. Note that the "gap" here includes the gap between the longitudinal end of the second recess and the reinforcing rib, as well as the gap between the side surface of the second recess and the reinforcing rib. [Effects of the Invention]

[0027] As can be understood from the above description, the buckling restrained brace of the present invention is suitable for use in a frame such as a wooden building, and can provide a buckling restrained brace that is easy to manufacture. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view of an example of a core material that forms a buckling restrained brace according to an embodiment. [Figure 2] FIG. 1 is an exploded perspective view of an example of a wooden restraint member that forms a buckling restrained brace according to embodiments. [Figure 3] FIG. 1 is a perspective view of an example of a buckling restrained brace according to embodiments. [Figure 4] 4 is a cross-sectional view of an example of an end portion of a buckling restrained brace, taken along the line IV-IV in FIG. 3. FIG. [Figure 5A] FIG. 4 is a cross-sectional view of an example of the center portion of a buckling restrained brace, taken along the arrows VV in FIG. 3. [Figure 5B] 4 is a cross-sectional view of another example of the central portion of a buckling restrained brace, taken along the arrows VV in FIG. 3. FIG. [Figure 6] FIG. 10 is a perspective view of another example of a buckling restrained brace according to embodiments. [Figure 7] FIG. 1 is a diagram showing a state in which a buckling restraint brace according to an embodiment is incorporated into the frame of a wooden building or the like. [Figure 8] 1 is a diagram illustrating the deformation of the frame during a major earthquake and the additional bending moment at the buckling-restrained brace joint due to the deformation of the frame. [Figure 9] FIG. 10 is a diagram showing the overall buckling line of the buckling restraint brace. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, a buckling restrained brace according to an embodiment will be described with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components will be designated by the same reference numerals, and redundant description may be omitted.

[0030] [Buckling restrained brace according to the embodiment] First, an example of a buckling-restrained brace according to an embodiment will be described with reference to Figures 1 to 6. Here, Figure 1 is a perspective view of an example of a core material forming the buckling-restrained brace according to an embodiment, and Figure 2 is an exploded perspective view of an example of a wooden restraining material forming the buckling-restrained brace according to an embodiment. Also, Figure 3 is a perspective view of an example of a buckling-restrained brace according to an embodiment, Figure 4 is a view taken in the direction of arrows IV-IV in Figure 3 and is a cross-sectional view of an example of an end portion of the buckling-restrained brace, and Figures 5A and 5B are both views taken in the direction of arrows VV in Figure 3 and are cross-sectional views of an example of a central portion of the buckling-restrained brace.

[0031] 1, core material 10 is formed from a slender, plate-shaped flat steel, and has a narrow portion 13 at the center in the longitudinal direction where the wide surface 11a is relatively narrow, and two wide portions 12A, 12B at the ends in the longitudinal direction where the wide surface 11a is relatively wide (wide portion 12B at the end is wider than wide portion 12A). In addition, reinforcing ribs 14 perpendicular to wide surface 11a are welded to wide surface 11a at the ends in the longitudinal direction of core material 10, giving it a cross-shaped cross section.

[0032] By having a narrow width portion 13 at the center of the core material 10 in the longitudinal direction and a wide width portion 12 at the end of the longitudinal direction, the narrow width portion 13 at the center can be made into a region that is easy to plasticize (plasticization region A), and further, the plasticization region A can be limited to the narrow width portion 13 at the center.

[0033] In the core material 10, in the boundary region between the wide width portion 12A and the narrow width portion 13, the region on the narrow width portion 13 side is a change region where the planar area and cross-sectional area of ​​the core material 10 change and become smaller, and therefore a plasticized region A that is prone to plasticization is formed. In the illustrated example, reinforcing ribs 14 are attached particularly to the wide width portion 12, further increasing the rigidity of the wide width portion 12, which also makes it easier for a plasticized region A to form in the boundary region on the narrow width portion 13 side. The additional bending moment acting on the core material 10 is effectively absorbed in this plasticized region A.

[0034] Furthermore, as will be explained below, the wide portion 12 and the reinforcing rib 14 each have bolt holes 12a, 14a for bolting via a splice plate to a gusset plate provided on the structural face or a fin stiffener (see FIG. 7) attached to the gusset plate. When the buckling restrained brace 100 is attached to a gusset plate so that the wide face 11a of the core member 10 is arranged parallel to the structural face of the building, the core member 10 has reinforcing ribs 14 that are perpendicular to the wide face 11a that is parallel to the structural face, thereby increasing the rigidity of the end of the core member 10 in the direction outward from the structural face.

[0035] The core material 10 is preferably formed from a steel material with a low yield point such as SN material (rolled steel for building structures) or LYP material (extremely low yield point steel), which improves earthquake energy absorption due to yielding of the core material 10.

[0036] As shown in Figure 2, the wooden restraint member 20 is formed by a pair of restraint plates 21, and a first recess 26 for accommodating the core material 10 is provided at a corresponding position (the center position in the height direction) on the abutment surface 25 of each restraint plate. The first recess 26 extends in a direction perpendicular to the abutment surface 25. The core material 10 is accommodated in both first recesses 26, and the abutment surfaces 25 of both plates abut and connect with each other, thereby forming the wooden restraint member 20 with the core material 10 sandwiched inside.

[0037] In addition, second recesses 27 are provided at both ends of the restraint plate 21, perpendicular to the first recesses 26. When the core material 10 is sandwiched inside the wooden restraint member 20, a portion of the reinforcing rib 14 at the end of the core material 10 is accommodated in the second recess 27, thereby preventing interference between the reinforcing rib 14 and the end of the restraint plate 21.

[0038] The restraint plate 21 has a plurality of laminas 22 on the contact surface 25. ParallelThe wooden restraint member 20 is a laminated timber formed by laminating pieces of wood in the same direction and then bonding them together. As will be explained in detail below, the cross-sectional area, cross-sectional stiffness, Young's modulus, etc. of the wooden restraint member 20 are set to prevent global buckling of the buckling restrained brace. The Young's modulus is determined by the wood material. Examples of wood materials include Japanese cypress, red pine, larch, fir, and Yezo spruce.

[0039] As shown in Figure 3, wooden restraint members 20 are formed by bonding the contact surfaces 25 of a pair of restraint plates 21 with adhesive 30, and a buckling restrained brace 100 is formed that includes a core member 10 and wooden restraint members 20. The adhesive 30 can be a urethane-based adhesive, an epoxy-based adhesive, or the like.

[0040] As shown in Figure 4, at the end of the wooden restraint material 20, a predetermined gap G is provided between the first recess 26 and the second recess 27 and the wide portion 12 and reinforcing rib 14 housed therein.

[0041] In this way, by having a gap G between the first recess 26 and the second recess 27 and the wide portion 12 and the reinforcing rib 14, when the buckling restraint brace 100 incorporated into the frame is deformed during an earthquake, the wide portion 12 and the reinforcing rib 14 come into contact with the first recess 26 and the second recess 27, preventing damage to the restraint plate 21 due to pressure being applied to their wall surfaces.

[0042] Meanwhile, the central portion of the wooden restraint member 20 has two cross-sectional shapes, as shown in Figures 5A and 5B. In the shape shown in Figure 5A, the wide surface 11a and the narrow surface 11b of the narrow portion 13 of the core material 10 are tightly fitted into the first recess 26.

[0043] In contrast, in the configuration shown in FIG. 5B, although there is a gap between the wide surface 11a and the narrow surface 11b of the narrow portion 13 and the first recess 26, this gap is blocked by the unbond material 40.

[0044] Here, the unbonded material 40 may be an elastic material with deformability such as butyl rubber, but from the viewpoint of sufficiently sealing the narrow gap between the first recess 26 and the core material 10, it is preferable to use an unbonded material made of a mixture of lubricant and synthetic resin.

[0045] Lubricants are divided into solid and liquid lubricants. Solid lubricants include molybdenum disulfide (MoS2), graphite, and fluororesin (PTFE: polytetrafluoroethylene). Liquid lubricants include lubricating oil. Synthetic resins (paints) include epoxy resin, silicone resin, acrylic resin, acrylic silicone resin, chlorinated rubber resin, silicon resin, phenolic resin, phthalic acid resin, unsaturated polyester resin, and polyurethane resin.

[0046] In this way, since the gap between the first recess 26 and the core material 10 contained therein is blocked by the unbonded material 40, when a local pressing force or the like acts from the core material 10 on the wall surface of the first recess 26 of the restraint plate 21 due to a high-order buckling deformation of the core material 10, the pressing force or the like is absorbed by the deformable unbonded material 40, thereby preventing damage to the restraint plate 21 due to this local pressing force or the like.

[0047] According to the buckling restraint brace 100, the core material 10 is housed in two first recesses 26 that extend perpendicular to the abutment surfaces 25 of a pair of restraint plates 21, and the abutment surfaces 25 are bonded together with adhesive 30, resulting in good manufacturability due to the simple configuration of components and simple connection method.

[0048] Furthermore, a pair of restraint plates 21 are connected to form a wooden restraint member 20 with a closed structure, and the steel core member 10 is surrounded by the wooden restraint member 20. Therefore, even when the buckling restraint brace 100 is applied to the frame of a wooden building, there is no risk of it appearing out of place with the frame components.

[0049] In addition, the restraint plate 21 has a plurality of laminas 22 on the contact surface 25. ParallelBecause the wooden restraint member 20 is a laminated wood in which the core material 10 is laminated in the strong axis direction and bonded to each other, the strong axis direction of the core material 10 is perpendicular to the lamination direction of the lamina 22. Therefore, when bending is applied to the core material 10 in the strong axis direction, the bonding surfaces of the lamina 22 are located as close as possible to the neutral axis, which improves the strength of the wooden restraint member 20 against bending in the strong axis direction.

[0050] Furthermore, since the weak axis direction of the core material 10 and the stacking direction of the lamina 22 are parallel, when bending acts in the weak axis direction of the core material 10, the lamina 22 of each layer can resist bending in the weak axis direction, and in particular, the outermost lamina 22a is the farthest from the neutral axis and can therefore most strongly resist bending in the weak axis direction.

[0051] A modified example of the buckling restrained brace is shown in Figure 6. The illustrated buckling restrained brace 100A differs from the buckling restrained brace 100 in that split prevention means 50, consisting of a driven or screwed material, is embedded from the side of one restraining plate 21 to the other restraining plate 21.

[0052] Materials to be driven into include nails and wooden dowels, while materials to be screwed into include wood screws and bolts.

[0053] In the illustrated example, split prevention means 50 are provided in a staggered arrangement above and below the sides of both restraint plates 21 .

[0054] In this way, in addition to connecting the restraint plates 21 together with adhesive 30, the anti-splitting means 50 is embedded from the side of one restraint plate 21 to the other restraint plate 21, which effectively prevents the restraint plates 21 from splitting and also functions as a fail-safe that prevents the restraint plates 21 from separating at the contact surface 25 in the event of a major earthquake, etc.

[0055] [Framework incorporating buckling restraint braces] Next, an example of a building frame incorporating a buckling restrained brace according to an embodiment will be described with reference to Figures 7 and 8. Here, Figure 7 is a diagram showing a state in which a buckling restrained brace according to an embodiment is incorporated into the frame of a wooden building or the like. Also, Figure 8 is a diagram explaining the deformation of the frame during a major earthquake and the additional bending moment at the buckling restrained brace joint resulting from the deformation of the frame. Note that the buckling restrained brace shown in the figure may be incorporated into the frame of a steel (S) building, a reinforced concrete (RC) building, or a steel reinforced concrete (SRC) building, in addition to the frame of a wooden building.

[0056] The frame S shown in Figure 7 is formed from wooden columns C and beams B that constitute a wooden building or the like. Gusset plates GP made of flat steel are attached to the two diagonally positioned corners. Fin stiffeners FS are welded to the surface of the gusset plates GP so that they are perpendicular to the surface. The fin stiffeners FS are joined to the gusset plates GP so that their center L3 intersects with the intersection O between the column center L1 of the column C and the beam center L2 of the beam B. The buckling restrained brace 100 is also arranged in a line that passes through both diagonally positioned intersections O.

[0057] The gusset plate GP and the wide portion 12 of the core material 10 are joined by high tension bolts via a splice plate SP, and the fin stiffener FS and the reinforcing rib 14 are joined by high tension bolts via a splice plate SP.

[0058] As shown in Figure 8, when a large earthquake occurs, deformation of the structural plane can cause an additional bending moment, as shown in equation (1) below, to act on the buckling-restrained brace joint, assuming that the joint is rigid.

[0059]

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[0060] With the buckling-restrained brace 100, a gap G is provided between the side surface of the wide section 12 of the core material 10 and the first recess 26 of the wooden restraint member 20. This allows the gap G to absorb deformation of the core material 10 when the structural surface to which the buckling-restrained brace 100 is attached undergoes significant deformation, preventing additional bending moments from acting on the wooden restraint member 20. Furthermore, a gap G is also provided between the reinforcing rib 14 and the second recess 27 of the wooden restraint member 20. This allows the gap G to absorb expansion and contraction of the core material 10 when it expands and contracts in response to deformation of the structural surface, preventing the expanding and contracting core material 10 from coming into contact with the wall surface of the second recess 27 and further pressing against it, damaging the wooden restraint member 20.

[0061] [Study of overall buckling] Next, we will explain the design method for preventing global buckling of buckling-restrained braces.

[0062] When designing a buckling-restrained brace, the following formula (2) must be satisfied to prevent global buckling of the buckling-restrained brace.

[0063]

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[0064] Here, the bending moment acting on the center of the restraint plate can be expressed by the following equation (3).

[0065]

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[0066] The condition for preventing the overall buckling of the wooden restraint member is to satisfy the following equation (4).

[0067]

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[0068] Equation (4) is shown in Figure 9 as the global bending stress curve for the buckling-restrained brace. In Figure 9, the upper side of the global bending stress curve is the safe zone, and the lower side is the dangerous zone. The design axial force of the wooden restraint member, the Euler load, the length of the general part of the core member, and the yield bending strength of the wooden restraint member are set so that they fall within the safe zone. Note that the global bending stress curve for the buckling-restrained brace shown in Figure 9 applies to both global buckling in the weak axis direction of the core member and global buckling in the strong axis direction.

[0069] In addition to examining the relationship between the yield bending strength of the wooden restraint material and the bending moment acting on it, it is also advisable to examine the fact that the short-term allowable bending strength of the wooden restraint material will be greater than the bending moment acting on it when the core material yields (formula omitted).

[0070] <Study on the compressive failure of wooden restraints> Next, we will explain how to consider the failure of wooden restraints due to the core material sinking into them. To prevent the wooden restraints from failing, we use the following formula (5): Verify satisfaction.

[0071]

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[0072] Here, in addition to examining the relationship between the compressive strength of the restraining plate and the stiffening force acting on it, it is also advisable to examine the fact that the short-term allowable compressive strength of the restraining plate will be greater than the stiffening force acting when the core material yields (formula omitted).

[0073] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0074] 10: Core material 11a: Wide surface 11b:Narrow side 12, 12A, 12B: Wide section 12a: Bolt hole 13: Narrow section 14: Reinforcement rib 14a: Bolt hole 20: Wooden restraint 21: Restraint board (laminated wood) 22: Lamina 22a: outermost lamina 25: Contact surface 26: First recess 27: Second recess 30: Adhesive 40: Unbonded material 50: Split prevention measures 100,100A: Buckling restrained brace A: Plasticization region S: Frame (composition) C: Pillar B: Beam GP: Gusset plate FS: Fin stiffener SP: Splice plate

Claims

1. A steel plate-shaped core material, a wooden restraint member formed of a pair of wooden restraint plates, each of which has a first recess in which the core material is housed at a corresponding position; the core material is accommodated in the two first recesses extending in a direction perpendicular to the contact surfaces of the pair of restraint plates, The buckling restraint brace is characterized in that the restraint plate is formed by stacking multiple laminas in a direction parallel to the abutment surface, in a direction perpendicular to the strong axis of the core material and the stacking direction of the laminas, and adhering them to each other.

2. 2. The buckling restraint brace according to claim 1, wherein the pair of restraint plates are connected at the abutment surfaces via an adhesive.

3. 3. The buckling restraint brace according to claim 2, characterized in that the wooden restraint member is made of a driven or screwed material and has a split prevention means for preventing the wooden restraint member from splitting, which is embedded from the side of one of the restraint plates to the other of the restraint plates.

4. 4. A buckling restraint brace as described in any one of claims 1 to 3, characterized in that the first recess contains an unbonded material, and the gap between the first recess and the core material, which has a cross-sectional dimension smaller than that of the first recess, is blocked by the unbonded material.

5. the core material is in the form of a plate having two wide surfaces and two narrow surfaces, and has a narrow portion at the center in the longitudinal direction where the wide surfaces are relatively narrow, and has wide portions at the end portions in the longitudinal direction where the wide surfaces are relatively wide, 5. The buckling restraint brace according to claim 1, wherein the narrow width portion has a plastic region in the core material that is most susceptible to plastic deformation.

6. a reinforcing rib orthogonal to the wide surface at the end of the core material in the longitudinal direction is joined to the wide surface, forming a cross-shaped cross section; a second recessed portion is provided at an end of the restraint plate at a position corresponding to the reinforcing rib so as not to interfere with the reinforcing rib; The buckling restraint brace according to claim 1 , wherein a portion of the reinforcing rib is housed in two corresponding second recesses on the abutment surface.

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