Buckling restraint brace

Abstract

To provide a buckling restrained brace that has an excellent exterior design while suppressing a buckled core material that has buckled in a higher-order buckling mode embedding into a restraint material.SOLUTION: A buckling restrained brace 100 comprises: a hybrid restraint body 50 formed by: a steel plate-shaped core material 10; a pair of steel restraints 30 made of square steel tubes arranged to face two wide faces 10a that the core material 10 has; and four wooden restraint materials 40A, 40B that surround the pair of steel restraint material 30. The four wooden restraints 40A, 40B comprise: a pair of first wooden restraint materials 40A that are arranged to span the pair of steel restraint materials 30; and a pair of second wooden restraint materials 40B that connect the pair of first wooden restraints 40A, at sides of the core material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a buckling restraint brace.

Background Art

[0002] Conventionally, as braces for forming building structures (column-beam structures, roof structures, etc.), buckling restraint braces with buckling prevention measures have been applied. As buckling restraint braces, there are various bracing forms, such as a form in which only a steel plate reinforces the periphery of a steel core material, a form in which RC (Reinforced Concrete) reinforces the periphery of a steel core material, and a form in which the periphery of a steel core material is coated with steel and mortar.

[0003] By the way, recently, efforts have been made to improve the fire resistance and seismic resistance of wooden buildings (wooden houses, wooden warehouses, wooden arenas, etc.). Wooden houses inherently have advantages such as a high degree of freedom in floor plans and designs, a soothing effect due to natural wood, a humidity control effect of wood, and generally lower construction costs compared to steel-frame or RC structures depending on the building use such as houses. However, the improvement of the above-mentioned fire resistance and seismic resistance is one of the factors increasing the attention of wooden buildings including wooden houses. When incorporating the above-mentioned conventional buckling restraint brace into the structure of such a wooden house, a wooden column or beam and a buckling restraint brace having a metal or concrete reinforcing material will coexist, and it is inevitable that the appearance will be unbalanced.

[0004] Therefore, a measure of covering the entire buckling restraint brace with a wooden or paper panel or the like so that the metal or concrete reinforcing material cannot be visually recognized from the outside can be considered. However, this measure requires a great deal of labor, so an increase in construction costs is a concern. In addition, since metal, concrete, mortar, etc. are frequently used in conventional buckling restraint braces, they tend to be heavy, and it is structurally unbalanced to attach a heavy buckling restraint brace to lightweight wooden beams and columns that make up a wooden house.

[0005] Here, Patent Document 1 proposes a buckling restraint brace suitable for being incorporated and used within the framework of wooden buildings including wooden houses. Specifically, it is a buckling restraint brace having a core material and a pair of restraint materials arranged along both sides of the core material. The core material is formed of steel, the pair of restraint materials are formed of wood, and laminated veneer lumber is applied to these restraint materials. The laminated veneer lumber is a buckling restraint brace in which laminas are laminated in parallel with the core material.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] According to the buckling restraint brace described in Patent Document 1, by means of a pair of restraint materials formed of wood, it is possible to improve the load-bearing capacity against the overall buckling of the buckling restraint brace.

[0008] By the way, during an earthquake, in the buckling restraint brace, while the wooden restraint material braces the core material, the core material buckles in its weak axis direction (buckling in the higher-order buckling mode) to absorb seismic energy. However, when the core material buckling in the higher-order buckling mode sinks into the wooden restraint material, the restraint material deforms. If the indentation load-bearing capacity (or indentation rigidity) of the restraint material is low, indentation deformation occurs early, the gap between the core material buckling in the higher-order buckling mode and the restraint material undergoing indentation deformation becomes large, a larger bracing force is generated and acts on the restraint material, and there is a risk that the restraint material will be damaged. Note that Patent Document 1 does not disclose a solution means for suppressing the indentation deformation of the restraint material when the core material buckles in the higher-order buckling mode.

[0009] The present invention has been made in view of the above problems, and an object thereof is to provide a buckling restraint brace that suppresses the core material buckling in the higher-order buckling mode from sinking into the restraint material and is excellent in appearance design.

Means for Solving the Problem

[0010] To achieve the above object, one aspect of the buckling restraint brace according to the present invention is a steel plate-shaped core material, and a pair of steel restraint members made of square steel pipes disposed so as to face two wide surfaces of the core material, and four wooden restraint members surrounding the pair of steel restraint members, and has a hybrid restraint body formed by the four wooden restraint members are a pair of first wooden restraint members disposed on the side of the core material so as to straddle the pair of steel restraint members, and a pair of second wooden restraint members connecting the pair of first wooden restraint members, and is characterized in that

[0011] According to this aspect, since the steel plate-shaped core material is restrained by a pair of steel restraint members made of square steel pipes, there is no risk that the core material buckled in a higher-order buckling mode will sink into the steel restraint members and be damaged. Further, since the pair of steel restraint members sandwiching the core material are surrounded by four wooden restraint members, a buckling restraint brace excellent in appearance design is obtained. Thus, the hybrid restraint body composed of the steel restraint members and the wooden restraint members forming this aspect is a restraint body that does not exist in the prior art and has both a high stiffening effect by the steel restraint members and excellent appearance design imparted by the wooden restraint members.

[0012] Here, for example, slits are provided on the wide surface of the core material, and axial force adjustment (or load-bearing capacity adjustment) acting on the core material is achieved by these slits. When this core material receives an axial force (compressive force), buckling in the higher-order mode effectively occurs in the weak-axis direction of the core material. However, due to the provision of slits on the wide surface, there is a trade-off relationship where the second moment of area in the strong-axis direction of the core material decreases and the compressive force in the strong-axis direction increases. To suppress this compressive force in the strong-axis direction, spacers shorter than the slits in length are inserted into the slits. In addition to the form in which spacers are inserted into the slits in this way, on the wide surface of the core material, there is also a form in which one through-hole and two or four cuts extending to one side or both sides of the through-hole and communicating with the through-hole are provided, and the through-hole and the cuts form the axial force adjustment means of the core material.

[0013] Further, the core material has a narrow-width portion where the width of the wide surface is relatively narrow on the central side in its longitudinal direction, and a wide-width portion where the width of the wide surface is relatively wide on the end side in its longitudinal direction. If the width of the wide surface is suddenly changed from the narrow-width portion to the wide-width portion, this change point becomes a structural weak part, and due to the possibility of being damaged prior to an earthquake, the earthquake energy absorption ability by plastic deformation of the entire narrow-width portion or a desired position may be inhibited. Therefore, it is preferable to provide a width transition region where the width of the wide surface gradually increases in a tapered or curved shape from the narrow-width portion to the wide-width portion, and such a width transition region is included in the wide-width portion in this specification.

[0014] Between the core material and the steel restraint material, there are forms where an unbonded material is interposed and a form without an unbonded material, i.e., a non-unbonded form. In the form where an unbonded material is interposed, the unbonded material is formed of an elastic material having deformation performance such as butyl rubber or a mixed material of a lubricant and a synthetic resin. By interposing the unbonded material or the like between the wide surface of the core material and the restraint material, using the thickness of the unbonded material or the like as a clearance, it becomes possible to cause buckling in the higher-order mode within this clearance when the core material receives a compressive force. On the other hand, in the non-unbonded form, a gap is provided between the core material and the restraint material, and it becomes possible to absorb the buckling in the higher-order mode of the core material in the gap.

[0015] In the form in which the unbonded material is interposed, a steel inner insert plate may be further interposed between the unbonded material and the steel restraint material. According to this form, since the steel inner insert plate is interposed between the unbonded material and the steel restraint material, the pressing force due to the buckling of the higher-order mode in the weak axis direction of the core material directly acts on the steel restraint material, and it is possible to effectively suppress the local failure of the steel restraint material.

[0016] Also, in another aspect of the buckling restraint brace according to the present invention, the pair of steel restraint materials restrain the higher-order buckling in the weak axis direction of the core material, the pair of first wooden restraint materials restrain the higher-order buckling in the strong axis direction of the core material, the wooden restraint material is a member that imparts appearance design properties.

[0017] According to this aspect, in addition to the pair of steel restraint materials having the effect of restraining the higher-order buckling (buckling of the higher-order mode) in the weak axis direction of the core material, the pair of first wooden restraint materials have the effect of restraining the higher-order buckling in the strong axis direction of the core material, so that the higher-order buckling in the strong axis direction of the core material can be suppressed, and the earthquake energy absorption property due to the higher-order buckling in the weak axis direction of the core material can be improved. Furthermore, since the wooden restraint material has the effect of suppressing the higher-order buckling in the strong axis direction of the core material by the first wooden restraint material which is its component, and the effect of imparting appearance design properties to the whole of the wooden restraint material, a plurality of excellent effects are achieved by the wooden restraint material, which is preferable.

[0018] Also, in another aspect of the buckling restraint brace according to the present invention, On both sides of the pair of steel restraint materials on the side of the core material, a pair of steel supplementary stiffening materials are connected, a plurality of threaded studs are attached to the wide surface of the steel supplementary stiffening material, a plurality of first insertion holes through which the plurality of threaded studs are inserted are provided in the first wooden restraint material, The threaded stud is inserted into the first insertion hole and tightened with a nut, so that the pair of steel restraint members and the pair of first wooden restraint members are joined. The pair of first wooden restraint members and the pair of second wooden restraint members are adhesively joined or joined with fasteners.

[0019] According to this aspect, on the side of the core material, the pair of steel stiffening members connect both sides of the pair of steel restraint members, so that the deformation in the width direction (strong axis direction) of the core material can be restrained by the steel stiffening members. Further, a plurality of threaded studs attached to the wide surface of the steel stiffening member are inserted into a plurality of first insertion holes provided in the first wooden restraint member and tightened with nuts, so that the pair of steel restraint members and the pair of first wooden restraint members are joined, and the pair of first wooden restraint members and the pair of second wooden restraint members are adhesively joined or joined with fasteners. Thus, the wooden restraint members can be efficiently and firmly joined to the pair of steel restraint members via the pair of steel stiffening members. Here, examples of the fasteners applied during the fastener joining include bolts such as wood screws, nails, and lag screw bolts.

[0020] Another aspect of the buckling restraint brace according to the present invention is When the pair of first wooden restraint members and the pair of second wooden restraint members are bolted together, A plurality of embedded nuts are attached to the first wooden restraint member, A plurality of second insertion holes are provided at positions corresponding to the plurality of embedded nuts in the second wooden restraint member, The first wooden restraint member and the second wooden restraint member are joined by screwing a bolt inserted through the second insertion hole into the corresponding embedded nut.

[0021] According to this aspect, a plurality of embedded nuts attached to the first wooden restraint member and a plurality of second insertion holes provided in the second wooden restraint member are aligned, and bolts inserted through the second insertion holes are screwed into the embedded nuts, whereby the first wooden restraint member and the second wooden restraint member can be bolted together efficiently and firmly.

[0022] In addition, another aspect of the buckling restraint brace according to the present invention is On the sides of the core material, both sides of the pair of steel restraint members are connected by a pair of steel stiffening members, The pair of first wooden restraint members are adhesively joined to the pair of steel stiffening members, Characterized in that the pair of second wooden restraint members are adhesively joined to the pair of first wooden restraint members.

[0023] According to this aspect, by connecting both sides of the pair of steel restraint members by a pair of steel stiffening members on the sides of the core material, deformation in the width direction (strong axis direction) of the core material can be restrained by the steel stiffening members. Further, since the pair of first wooden restraint members are adhesively joined to the pair of steel stiffening members and the pair of second wooden restraint members are adhesively joined to the pair of first wooden restraint members, the wooden restraint members can be efficiently and firmly joined to the pair of steel restraint members via the pair of steel stiffening members.

[0024] In addition, in another aspect of the buckling restraint brace according to the present invention, At both ends of the core material, a pair of joint plates that are joined to other members perpendicular to the wide surface are fixed, A pair of reinforcing plates are fixed to the pair of joint plates, and the ends of the steel restraint members are accommodated in the space formed by the wide surface, the pair of joint plates, and the reinforcing plates, The pair of first wooden restraint members do not surround the pair of joint plates, Characterized in that the pair of second wooden restraint members surround the pair of reinforcing plates.

[0025] According to this aspect, a pair of joint plates orthogonal to the wide-width surface are fixed at both ends of the core material, a reinforcing plate is fixed to the pair of joint plates, and the end portion of the restraint material is accommodated in the space formed by the wide-width surface, the pair of joint plates, and the reinforcing plate, whereby a buckling restraint brace having a high-strength end structure can be formed. Here, examples of other members to which the joint plates are joined include connection fixtures such as brackets and gusset plates that project in the plane from the corner portions of the building structure. Further, when the end portion of the core material is used as the web, the pair of joint plates orthogonal to this web become a pair of flanges.

Effect of the Invention

[0026] As can be understood from the above description, according to the buckling restraint brace of the present invention, it is possible to provide a buckling restraint brace that is excellent in appearance design while suppressing the core material buckling in the higher-order buckling mode from sinking into the restraint material.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Embodiments for Carrying Out the Invention

[0028] Hereinafter, the buckling restraint brace according to the embodiment will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0029] [Buckling Restraint Brace According to the Embodiment] With reference to FIGS. 1 to 6, an example of the buckling restraint brace according to the embodiment will be described. Here, FIG. 1 is an exploded perspective view of an example of the buckling restraint brace according to the embodiment, FIG. 2 is a perspective view of a buckling restraint brace intermediate body in which components other than the wooden restraint member are assembled among the components of an example of the buckling restraint brace according to the embodiment, and FIG. 3 is a perspective view of an example of the buckling restraint brace according to the embodiment. Further, FIG. 4 is a longitudinal sectional view in the direction perpendicular to the axis of an example of the buckling restraint brace, taken along the arrow IV-IV in FIG. 3, and FIG. 5 is a corresponding view to FIG. 4, which is a longitudinal sectional view in the direction perpendicular to the axis of another example of the buckling restraint brace.

[0030] The buckling restraint brace 100 includes a core material 10, a pair of steel restraint members 30 disposed so as to face two wide surfaces 10a of the core material 10, an unbonded material 20 interposed between the core material 10 and the steel restraint members 30, and a wooden restraint material 40 composed of a pair of first wooden restraint members 40A and a pair of second wooden restraint members 40B that surround the core material 10 and the pair of steel restraint members 30.

[0031] The core material 10 is formed of an elongated steel plate, has a narrow portion 11 with a relatively narrow width of the wide surface 10a on the central side in the longitudinal direction thereof, and has a wide portion 12 with a relatively wide width of the wide surface 10a on the end side in the longitudinal direction thereof.

[0032] The core material 10 is preferably formed of a steel material with a low yield point, such as SN material (rolled steel for building structures) or LYP material (extra-low yield point steel). By applying the core material 10 made of these materials, the earthquake energy absorption performance due to the yield of the core material 10 can be improved.

[0033] Since the core material 10 has a narrow-width portion 11 on the central side in its longitudinal direction and a wide-width portion 12 on the end side in the longitudinal direction, the narrow-width portion 11 on the central side can be made into a region where plasticization is easy, and furthermore, the plasticization region can be limited to the narrow-width portion 11 on the central side.

[0034] At the central position of the narrow-width portion 11 of the core material 10, steel cylindrical protrusions 15 project from the two wide-width surfaces 10a of the narrow-width portion 11. The protrusions 15 are joined to the wide-width surfaces 10a of the narrow-width portion 11 by welding or the like.

[0035] Also, on both sides of the protrusion 15 of the narrow-width portion 11 of the core material 10, elongated slits 14 are provided, and steel spacers 17 are inserted into the slits 14 in the X1 direction.

[0036] The slits 14 are pores for adjusting the yield strength of the core material 10, and the spacers 17 function as internal deformation prevention materials that prevent the core material 10 from deforming internally (deforming in the strong axis direction) due to the provision of the slits 14. The spacers 17 inserted into the slits 14 are position-regulated by a pair of steel restraint members 30.

[0037] Here, instead of the form in which the spacers 17 of separate members are inserted into the slits 14 provided in the core material 10 as shown in the illustrated example, on the wide-width surface of the core material, one through-hole and two or four cuts extending to one side or both sides of the through-hole and communicating with the through-hole may be provided, and the through-hole and the cuts may form an axial force adjustment means for the core material.

[0038] On the wide-width portions 12 at both ends of the core material, a joining plate 13 composed of a pair of steel plates, which is joined to other members orthogonally to the wide-width surface 10a, is joined by welding or the like.

[0039] The wide-width portion 12 and the joining plate 13 are each provided with bolt holes 12a and 13a, which are aligned with the bolt holes of connection jigs (other members) such as brackets and gusset plates that project into the plane from the corner portions of the building structure (not shown), and are bolted together.

[0040] A reinforcing plate 18 made of a steel plate is joined to the pair of joining plates 13 by welding or the like, and the end portion of the steel restraint member 30 is accommodated in the space formed by the wide-width portion 12 of the core material 10, the pair of joining plates 13, and the reinforcing plate 18.

[0041] The unbonded material 20 is inserted between the narrow-width portion 11 of the core material 10 and the steel restraint member 30. With the thickness of the unbonded material 20 as the clearance, when the building structure deforms, a compressive force acts on the core material 10, causing buckling (higher-order buckling) in the out-of-plane direction (weak-axis direction) of the narrow-width portion 11.

[0042] As the unbonded material 20, an elastic material such as butyl rubber is applied, for example. Also, a protrusion hole 20a into which the protrusion 15 of the core material 10 fits is provided at the central position in the longitudinal direction of the unbonded material 20.

[0043] The steel restraint member 30 is formed of a rectangular steel pipe in cross-section. A protrusion hole 30a into which the protrusion 15 of the core material 10 fits is provided on the side surface of the steel restraint member 30 where the unbonded material 20 abuts.

[0044] As shown in FIG. 1, after a pair of unbonded materials 20 are arranged in the X2 direction with respect to the pair of wide surfaces 10a of the core material 10, and a pair of steel restraint members 30 are arranged in the X3 direction, on the side of the core material 10, both sides of the pair of steel restraint members 30 (the side surfaces corresponding to the short sides of the rectangle) are connected by welding or the like with a steel stiffening member 60 made of a pair of steel plates.

[0045] A plurality (five in the illustrated example) of threaded studs 63 are welded to the wide surface 61 of the steel stiffening material 60 in the longitudinal direction thereof, and each threaded stud 63 projects laterally.

[0046] At this stage, as shown in FIG. 2, a buckling restraint brace intermediate body 100' is formed in which the core material 10 is surrounded by a pair of steel restraint materials 30 and a pair of steel stiffening materials 60.

[0047] Next, as shown in FIG. 1, a first wooden restraint material 40A is attached to the pair of steel stiffening materials 60.

[0048] Here, the first wooden restraint material 40A is formed of laminated lumber, solid wood, or the like in which laminas are laminated, and examples of the wood material include cypress, red pine, larch, fir, and spruce.

[0049] A plurality (five in the illustrated example) of first insertion holes 46 straddling the pair of wide surfaces 41, 42 are provided in the first wooden restraint material 40A, and the threaded studs 63 are inserted into the respective first insertion holes 46.

[0050] A seat hollowing groove 45 is provided at a position corresponding to the first insertion hole 46 in the wide surface 41 facing outward among the pair of wide surfaces 41, 42. The first wooden restraint material 40A is disposed in the X5 direction such that the respective threaded studs 63 projecting from the stiffening plate 60 are inserted into the corresponding first insertion holes 46, and the end screws of the threaded studs 63 are projected from the seat hollowing groove 46.

[0051] Next, after a nut 65 is screwed in the X6 direction and tightened against the end screw projecting inside the seat hollowing groove 46, a wooden plug 49 is fitted in the X7 direction to the top of the seat hollowing groove 46 to close the seat hollowing groove 46, whereby a pair of first wooden restraint materials 40A are joined to the steel stiffening materials 60 connected to the pair of steel restraint materials 30, respectively.

[0052] Next, a pair of second wooden restraint members 40B are disposed in the X8 direction at both ends of the pair of first wooden restraint members 40A, and a plurality of wood screws 67 (an example of a fastener) are driven in the X9 direction to join the first wooden restraint member 40A and the second wooden restraint member 40B, thereby forming a wooden restraint member 40 composed of the pair of first wooden restraint members 40A and the pair of second wooden restraint members 40B.

[0053] Here, the second wooden restraint member 40B is formed of a solid wood material, a decorative board with the surface of a plywood processed, or the like. In addition to connection by a fastener such as a wood screw, the connection between the first wooden restraint member 40A and the second wooden restraint member 40B may also be an adhesive bonding via an adhesive.

[0054] Then, a pair of steel restraint members 30 that directly restrain the pair of wide surfaces 10a of the core material 10 and the wooden restraint member 40 that surrounds the periphery thereof form a hybrid restraint body 50 made of steel and wood. As shown in FIGS. 3 and 4, a buckling restraint brace 100 in which the core material 10 is restrained by the hybrid restraint body 50 is formed. As shown in FIG. 3, in the buckling restraint brace 100, the lengths of both are set such that the pair of first wooden restraint members 40A do not surround the pair of joint plates 13 and the pair of second wooden restraint members 40B surround the pair of reinforcing plates 18.

[0055] In the buckling restraint brace 100, the pair of steel restraint members 30 that form the hybrid restraint body 50 are members that restrain the higher-order buckling in the weak axis direction of the core material 10, and the pair of first wooden restraint members 40A are members that restrain the higher-order buckling in the strong axis direction of the core material 10. Further, the wooden restraint member 40 formed by the pair of first wooden restraint members 40A and the pair of second wooden restraint members 40B is a member that imparts an appearance design property.

[0056] In this way, since the pair of wide surfaces 10a of the core material 10 are restrained by the pair of steel restraint members 30 made of square steel pipes, there is no risk that the core material 10 buckling in the higher-order buckling mode in the weak axis direction will sink into the steel restraint member 30 and be damaged.

[0057] In addition, by restraining the higher-order buckling of the core material 10 in the strong axis direction with a pair of first wooden restraining members 40A, the higher-order buckling of the core material 10 in the strong axis direction can be suppressed, and the earthquake energy absorption performance due to the higher-order buckling of the core material 10 in the weak axis direction can be improved.

[0058] Furthermore, when a pair of steel restraining members 30 sandwiching the core material 10 are surrounded by four wooden restraining members 40A and 40B, a buckling restraining brace 100 with excellent aesthetic design is formed. Therefore, even when the buckling restraining brace 100 is applied to the structure of a wooden building, there is no fear of giving a mismatched appearance with wooden structural components such as wooden columns and wooden beams.

[0059] On the other hand, FIG. 5 shows another example of the buckling restraining brace according to the embodiment. In the buckling restraining brace 100A shown in FIG. 5, a plurality of embedded nuts 71 are attached to the first wooden restraining member 40C, and a plurality of second insertion holes 46A are provided at positions corresponding to the respective embedded nuts 71 in the second wooden restraining member 40D. The first wooden restraining member 40C and the second wooden restraining member 40D are joined by screwing a bolt 68 inserted through the second insertion hole 46A into the corresponding embedded nut 71 to form a wooden restraining member 40'. The buckling restraining brace 100A is different from the buckling restraining brace 100 in that a hybrid restraining body 50A is formed.

[0060] At a position corresponding to the second insertion hole 46A in the second wooden restraining member 40D, a counterbored groove 45A is provided. After the bolt 68 is tightened inside the counterbored groove 45A, the counterbored groove 45A is closed with a wooden plug 49A.

[0061] Thus, also in the buckling restraining brace 100A, the same effects as those of the above-described buckling restraining brace 100 are obtained. That is, a pair of steel restraining members 30 forming the hybrid restraining body 50A are members that restrain the higher-order buckling of the core material 10 in the weak axis direction, and a pair of first wooden restraining members 40C are members that restrain the higher-order buckling of the core material 10 in the strong axis direction. Furthermore, the wooden restraining member 40' formed by the pair of first wooden restraining members 40C and the second wooden restraining member 40D is a member that imparts aesthetic design.

[0062] Here, the buckling restraint braces 100 and 100A in the illustrated example are formed by joining the first wooden restraint members 40 and 40C to the threaded studs 63 projecting from the steel stiffener 60 by nut tightening, and then joining the first wooden restraint members 40A and 40C and the second wooden restraint members 40B and 40D with fasteners such as wood screws 67 and bolts 68 to form the hybrid restraint bodies 50 and 50A. Instead of such a forming method, a forming method may be applied in which the first wooden restraint member is adhesively joined to the steel stiffener 60, and the second wooden restraint member is adhesively joined to the first wooden restraint member.

[0063] Next, with reference to FIGS. 6A and 6B, the higher-order buckling occurring in the weak axis direction and the strong axis direction of the core material 10 and its restraint effect will be described.

[0064] The buckling restraint brace 100 is incorporated into the building structure by being bolted or the like to the connection fixtures provided at the corner portions or the like of the building structure at both of its ends. When the building structure deforms during an earthquake, an external force such as a horizontal force during the earthquake enters the end of the buckling restraint brace 100 through the connection fixture, and the external force is transmitted as a compressive force N from the end of the core material 10 to its entire area. As a result, for example, the narrow-width portion 11 of the core material 10 undergoes plastic deformation, thereby exhibiting the energy absorption performance during an earthquake. In other words, when a compressive force N acts on the core material 10, higher-order buckling occurs in the weak axis direction at the narrow-width portion 11 of the core material 10, and by causing the narrow-width portion 11 of the core material 10 to buckle as evenly as possible, the overall plastic deformation performance of the buckling restraint brace 100 can be exhibited.

[0065] As shown in FIGS. 5A and 5B, due to the compressive force N acting on the core material 10, higher-order buckling occurs in the weak axis direction, and the peaks of the wavy deformation due to the buckling apply a pressing force Q1 to the steel restraint member 30 made of a square steel pipe.

[0066] However, since the steel restraint member 30 made of a high-rigidity square steel pipe restrains the wide surface of the core material 10, there is no fear of local failure due to the indentation of the steel restraint member 30 caused by the pressing force Q1.

[0067] On the other hand, higher-order buckling can occur in the strong axis direction of the core material 10. And although the peaks of the wavy deformation due to higher-order buckling in the strong axis direction apply a pressing force Q2 to the first wooden restraint member 40A, since the higher-order buckling in the strong axis direction is slight compared to the weak axis direction, the pressing force Q2 caused by the higher-order buckling in the strong axis direction is significantly smaller than the pressing force Q1. Therefore, there is no risk of local buckling due to the indentation of the first wooden restraint member 40A by the pressing force Q2.

[0068] In addition, other embodiments in which other components are combined with the configurations described in the above embodiments may be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the gist of the present invention, and can be appropriately determined according to the application form.

Explanation of reference numerals

[0069] 10: Core material 10a: Wide surface 11: Narrow part 12: Wide part 12a: Bolt hole 13: Joint plate 13a: Bolt hole 14: Slit 15: Protrusion 17: Spacer 18: Reinforcing plate 20: Unbonded material 20a: Protrusion hole 30: Steel restraint member (square steel pipe) 30a: Protrusion hole 40, 40': Wooden restraint member 40A, 40C: First wooden restraint member (wooden restraint member) 40B, 40D: Second wooden restraint member (wooden restraint member) 41, 42: Wide surface 45, 45A: Seat cut groove 46: First insertion hole 46A: Second insertion hole 47, 48: Wide surface 49, 49A: Wood plug 50, 50A: Hybrid restraint body 60: Steel stiffening member 61: Wide surface 63: Threaded stud 65: Nut 67: Fastener (wood screw) 68: Bolt 100': Buckling restraint brace intermediate body 100: Buckling restraint brace N: Axial force (compressive force) Q1, Q2: Pressing force

Claims

1. A steel plate-shaped core material, A hybrid restraint body is formed by a pair of steel restraint members made of square steel pipes arranged to face the two wide surfaces of the core material, and four wooden restraint members surrounding the pair of steel restraint members, The four wooden restraints are: A pair of first wooden restraint members are arranged on the sides of the core member so as to straddle the pair of steel restraint members; A buckling restraint brace comprising a pair of second wooden restraint members connecting the pair of first wooden restraint members.

2. The pair of steel restraining members restrain higher-order buckling of the core material in the weak axis direction, The pair of first wooden restraining members restrain higher-order buckling of the core material in the strong axis direction, The buckling restraint brace according to claim 1, wherein the wooden restraint material is a member that imparts an aesthetic design to the structure.

3. A pair of steel stiffeners connect both sides of the pair of steel restraint members on the sides of the core member, a plurality of threaded studs are attached to the broad side of the steel stiffener; the first wooden restraint member has a plurality of first insertion holes through which the plurality of threaded studs are inserted; The threaded studs are inserted into the first insertion holes and nuts are tightened to join the pair of steel restraint members and the pair of first wooden restraint members.

3. The buckling restraint brace of claim 1 or 2, wherein the pair of first wooden restraint members and the pair of second wooden restraint members are adhesively bonded or fastened together.

4. When the pair of first wooden restraint members and the pair of second wooden restraint members are bolted together, A plurality of embedded nuts are attached to the first wooden restraint member; A plurality of second insertion holes are provided at positions corresponding to the plurality of embedded nuts in the second wooden restraint material, The buckling restraint brace of claim 3, characterized in that the first wooden restraint material and the second wooden restraint material are joined by a bolt inserted through the second insertion hole being screwed into the corresponding embedded nut.

5. A pair of steel stiffeners connect both sides of the pair of steel restraint members on the sides of the core member, The pair of first wooden restraint members are adhesively bonded to the pair of steel stiffeners, 3. The buckling restraint brace of claim 1 or 2, wherein the pair of second wooden restraint members are adhesively bonded to the pair of first wooden restraint members.

6. A pair of joining plates are fixed to both ends of the core material, and are joined to other members perpendicular to the wide surface, A pair of reinforcing plates are fixed to the pair of joining plates, and ends of the steel restraint material are accommodated in a space formed by the wide surface, the pair of joining plates, and the reinforcing plates; The pair of first wooden restraining members do not surround the pair of connecting plates, The buckling restraint brace of claim 1 or 2, wherein the pair of second wooden restraint members surround the pair of reinforcing plates.

Images