JPH059976A - Buckling constraint member - Google Patents

Abstract

PURPOSE:To provide a buckling constraint member which does not lose tensile strength even when it encounters a fire and has a narrow section. CONSTITUTION:A steel made central axial force member 3 is constituted of fire resisting steel in a buckling constraint member where the steel made central axial force member 3 is inserted into a buckling constraint concrete member 2 reinforced by a steel pipe 1 and an antisticking coat 4 is provided between the surface of the central axial force member 3 and the concrete member 2. The steel pipe 1 is constituted of common steel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckling restraint member such as a buckling restraint bracing member used as a structural element for resisting horizontal force such as seismic force or wind force in buildings and other structures. is there.

[0002]

2. Description of the Related Art Conventionally, as a buckling restraint member used for buildings and other structures, as disclosed in Japanese Utility Model Publication No. 63-101603, a buckling restraint concrete member reinforced by a steel pipe. There is known a structure in which a steel central axial force member is inserted into the steel plate, and an adhesion preventing coating is provided between the surface of the central axial force member and the concrete member.

[0003]

In the case of the conventional buckling restraint member, when a fire is encountered, the steel central axial member becomes hot and loses its tensile strength. Must be thicker or have a refractory coating. However, if the cover thickness of the concrete member is increased or a fireproof coating is applied, the manufacturing cost of the buckling restraint member becomes high, and the weight of the buckling restraint member becomes heavy, and the transportability and handleability deteriorate, and Since the cross section of the buckling restraint member becomes large, the dead space becomes large in the plan of the architectural design, which is disadvantageous.

[0004]

In order to advantageously solve the above-mentioned problems, in the buckling restraint member of the present invention, the steel pipe 1 is used.
A steel central axial force member 3 is inserted through the buckling restraint concrete member 2 reinforced by the above, and a sticking prevention coating 4 is provided between the surface of the central axial force member 3 and the concrete member 2. In the buckling restraint member, the steel central axial force member 3 is made of a refractory steel material, and the steel pipe 1 is made of a normal steel material.

[0005]

1 to 3 show a buckling restraint member 5 according to an embodiment of the present invention, in which each side at both ends of a steel central axial force member 3 made of refractory steel having a cross-shaped cross section. Is provided with a plurality of through holes 6 for bolt insertion, and an anti-adhesion coating 4 made of form remover, oil paint, asphalt, etc. is formed on the entire surface of the intermediate portion of the steel central axial force member 3. The intermediate portion of the steel central axial force member 3 coated with the adhesion preventing coating 4 is inserted into a steel pipe 1 having a square cross section made of ordinary steel, and concrete is filled between the steel pipe 1 and the adhesion preventing coating 4. The buckling restraint concrete member 2
Is configured.

The refractory steel materials include Ni, Mo, Cr
A steel material containing is used.
The tensile force does not decrease at all. As the ordinary steel material, for example, SS41 is used.

FIGS. 4 and 5 show an example of use of the buckling restraint member 5 according to the above-mentioned embodiment, in which a cross-shaped steel fitting 8 is fixed to a beam 7 in a steel structure by welding. The mounting bracket 8 and the end of the steel central axial force member 3 are
It is connected by a steel joint plate 9 and a bolt 10.

[0008]

According to the present invention, the buckling restraining concrete member 2 reinforced by the steel pipe 1 is attached to the steel central axial force member 3
In the buckling restraint member in which the adhesion preventing coating 4 is provided between the surface of the central axial force member 3 and the concrete member 2, the steel central axial force member 3 is made of a fire-resistant steel material. Since the steel pipe 1 is made of ordinary steel material, it is possible to provide a buckling restraint member having a narrow cross section without losing tensile strength even if a fire is encountered.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a buckling restraint member according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG.

FIG. 4 is a side view showing a usage state of the buckling restraint member according to the embodiment of the present invention.

FIG. 5 is a partially longitudinal front view showing a mounting state of an end portion of a buckling restraint member.

[Explanation of symbols]

 1 Steel Pipe 2 Concrete Member for Buckling Restraint 3 Steel Central Axial Force Member 4 Adhesion Preventing Film 5 Buckling Restraint Member 6 Through Hole for Bolt Insertion 7 Beam 8 Mounting Bracket 9 Joint Plate 10 Bolt

Claims (1)

1. A steel central axial force member 3 is inserted into a buckling restraining concrete member 2 reinforced by a steel pipe 1, and the surface of the central axial force member 3 and the concrete member 2 are connected to each other. In the buckling restraint member in which the adhesion preventing film 4 is provided between the seats, the steel central axial force member 3 is made of a refractory steel material, and the steel pipe 1 is made of a normal steel material. Buckling restraint member.