JP-7856256-B2 - Buckling-restrained brace and its manufacturing method

JP7856256B2JP 7856256 B2JP7856256 B2JP 7856256B2JP-7856256-B2

Inventors

西村健
中谷幸彦
中原隆雄
梶原武志

Assignees

大和ハウス工業株式会社

Dates

Publication Date: 20260511
Application Date: 20220228

Claims (5)

A steel, plate-shaped core material, A pair of restraining members made of rectangular steel pipes are arranged to face the two wide surfaces of the core material, An unbonded material interposed between the core material and the restraining material, The core material has a pair of stiffening members on its side, connecting both sides of the pair of restraining members. The core material is surrounded by the pair of restraining members and the pair of stiffening members. At least the restraining member and the stiffening member are connected via a laser welded joint, A buckling-restrained brace characterized in that the laser-welded portion is located inside the end of the stiffening material.
The buckling-restrained brace according to claim 1 , characterized in that the laser-welded portion is either a linear continuous form or a linear intermittent form.
The buckling-restrained brace according to claim 1 or 2 , characterized in that the laser-welded portion is a fiber laser-welded portion.
A pair of connecting plates are fixed to both ends of the core material, perpendicular to the wide surface, and joined to other members. A buckling-restrained brace according to any one of claims 1 to 3, characterized in that a reinforcing plate is fixed to the pair of connecting plates, and the end of the restraining member is housed in the space formed by the wide surface, the pair of connecting plates, and the reinforcing plate.
A method for manufacturing a buckling-restrained brace, A method for manufacturing a buckling-restrained brace, characterized by having a steel, plate-shaped core material, a pair of unbonded materials abutting against two wide surfaces of the core material, the pair of unbonded materials being sandwiched between a pair of restraining members made of square steel pipes, and welding both sides of the pair of restraining members together with a pair of stiffening members on the side of the core material, wherein the welding is performed by laser welding inside the ends of the stiffening members .

Description

This invention relates to a buckling-restrained brace and a method for manufacturing the same. Conventionally, buckling-restrained braces, which incorporate buckling prevention measures, have been used as braces to form building structures (column and beam frames, roof frames, etc.). Various bracing configurations exist for buckling-restrained braces, including those with a steel core reinforced only with steel plates, those reinforced with reinforced concrete (RC), and those covered with steel and mortar. Here, Patent Document 1 proposes a buckling-restrained brace in which the core material is restrained by a restraining member formed from a pair of rectangular steel pipes, and which prevents localized failure of the restraining member that receives compressive force from the core material. Specifically, it is a buckling-restrained brace comprising a core material having joints at both ends of a plate-like portion for joining with other members, and restraining members arranged opposite each surface perpendicular to the weak axis direction of the plate-like portion. In this buckling-restrained brace, both ends of the stiffening member are connected to the pair of restraining members surrounding the core material via welds formed by fillet welding. Patent No. 6445862 This is an exploded perspective view of an example of a buckling-restrained brace according to an embodiment.This is a longitudinal cross-sectional view perpendicular to the axis of the buckling-restrained brace according to the embodiment, before assembly.This is a perspective view showing a state in which a pair of stiffening members are connected to a pair of restraining members by an example of a laser weld.This is a perspective view showing a pair of stiffening members connected to a pair of restraining members by another example of a laser-welded joint.This is a perspective view of an example of a buckling-restrained brace according to an embodiment.This is a longitudinal cross-sectional view of a conventional example in which a pair of stiffening members are connected to a pair of restraining members by an arc weld, and shows examples of the bending moment acting on the arc weld and the width of the stiffening members.This is a longitudinal cross-sectional view of an embodiment in which a pair of stiffening members are connected to a pair of restraining members by a laser weld, and shows examples of the bending moment acting on the laser weld and the width of the stiffening members.This is a schematic longitudinal cross-sectional view of a buckling-restrained brace in the direction perpendicular to the axis, illustrating the state in which the compressive force during higher-order mode buckling acts from the core material to the restraining material. The buckling-restrained brace and its manufacturing method according to the embodiment will be described below with reference to the attached drawings. Note that in this specification and the drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations. [Buckling-restrained brace according to an embodiment and its manufacturing method] An example of a buckling-restrained brace and its manufacturing method according to an embodiment will be described with reference to Figures 1 to 6. Here, Figure 1 is an exploded perspective view of an example of a buckling-restrained brace according to an embodiment, and Figure 2 is a longitudinal cross-sectional view of the end of the buckling-restrained brace according to an embodiment, in the direction perpendicular to the axis of the buckling-restrained brace in its pre-assembly state. Figures 3A and 3B are perspective views showing a state in which a pair of stiffening members are connected to a pair of restraining members by an example of a laser-welded joint. The buckling-restrained brace 100 comprises a core material 10, a pair of restraint members 30 arranged to face the two wide surfaces 10a of the core material 10, and an unbonded material 20 interposed between the core material 10 and the restraint members 30. In addition to the illustrated example, an interposition plate may be interposed between the unbonded material 20 and the restraint members 30. The core material 10 is preferably made of a low-yield-point steel material such as SN material (rolled steel for building structures) or LYP material (very low yield-point steel). By using a core material 10 made of these materials, the seismic energy absorption due to yielding of the core material 10 is improved. The core material 10 is formed from an elongated steel plate, and has a narrow section 11 at the center of its longitudinal direction where the width of the wide surface 10a is relatively narrow, and a wide section 12 at the end of its longitudinal direction where the width of the wide surface 10a is relatively wide. The core material 10 has a narrow section 11 on its longitudinal central side and a wide section 12 on its long