JPH11117404A - Cross-shaped buckling restraint bracing members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity and yield strength without causing eccentricity by inserting multiple steel central axial force members into at least one side of a buckling constraining concrete member integrated into a cross shape, inserting one or more steel central axial force members into the other side, and providing sticking preventing films between the steel central axial force member surfaces and the concrete member. SOLUTION: Steel central axial force members 2 are inserted into steel pipes 5 combined into a cross shape, steel reinforcing rib plates 6 are fixed to both end sections of the central axial force members 2, and sticking preventing films 3 are formed at the inner portions of the steel pipes 5 at the central members 2 and the rib plates 6. Concrete 8 is filled into the steel pipes 5 to form a buckling constraining concrete member 1. The steel central axial force members 2 in the steel pipes 5 are formed with one band plate in one direction and two band plates in the other direction, and they cross noneccentrically to each other at a central intersection, thereby the buckling constraining concrete member 1 serving as two brace members can be arranged into an X-shape without causing eccentricity in a limited area, and its rigidity and yield strength can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 8 shows an example of a conventional buckling restraint brace member described in Japanese Utility Model Publication No. 4-191121, and various other similar types are known. I have. In FIG. 8, a steel central axial force member 2 is inserted through a buckling restraining concrete member 1 reinforced with steel, and a steel reinforcing rib plate 6 is fixed to an end of the steel central axial force member 2. ing. A cross-shaped steel mounting bracket 11 is fixed to the beam 10 of the steel structure by welding, and the mounting bracket 11 and the rib plate 6 are connected by a steel joint plate 12 and bolts 13.

[0003]

Since the conventional buckling restraint bracing members are all single members, they must be attached as shown in FIG. 9 or FIG. 10 when attached to a structure. Here, 10a is a column or beam structural member, and 4 is a buckling restraint bracing member. The most basic arrangement is as shown in FIG. 9, but if the required rigidity or proof strength is insufficient in a limited structural frame area, as shown in FIG. The number of attachments can be increased. However, in the arrangement of FIG. 10, the mounting angle in the vertical direction is steep, so the rigidity and proof stress efficiency of the brace are deteriorated, and the length of the brace member excluding a fixed joint length is shortened, so that energy absorption is performed. There is a problem that the ability is reduced. On the other hand, when the two buckling restraint braces are arranged in a cross shape (X-shape) alternately in the front and rear as shown in FIG. 11, these problems are solved, but the two buckling restraint braces 4 are removed. Because it is necessary to cross staggered,
Out-of-frame eccentricity occurs, which causes difficulty in designing joints and members.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cruciform (X-type) buckling restraint bracing member which can advantageously solve the above-mentioned problems. The gist of the invention is that, with respect to the invention of claim 1, the buckling restraining concrete member 1 reinforced with steel is integrated in a cross shape, and a plurality of steel central axial forces are provided on at least one side of the concrete member 1. The member 2 is inserted, and one or more steel central axial force members 2 are inserted into the other of the concrete member 1, and an adhesion preventing coating 3 is provided between the surface of the steel central axial force member 2 and the concrete member 1. Is provided. According to the invention of claim 2, the steel central axial force member 2 provided on one side of the concrete member 1 is composed of two flat plates, and the steel central axial force member 2 is provided on the other side of the concrete member 1. It is characterized in that the steel central axial force member 2 and the provided anti-adhesion coating 3 are arranged in parallel at a distance corresponding to the thickness of the anti-adhesion coating 3. According to the invention of claim 3, the steel central axial force member 2 provided on the other side of the concrete member 1 is composed of two flat plates, and the two steel central axial force members 2 are arranged in contact with each other. An anti-adhesion coating 3 is provided between the surface of the steel central axial force member 2 and the concrete member 1.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The rigidity and proof stress of a buckling-restraining bracing member are determined by the cross-sectional area of the steel central axial force member, the number of braces,
And it is proportional to the looseness of the mounting angle. In the present invention, by using a plurality of flat plates by the above means, the cross-sectional area of the steel central axial force member included in one buckling restraining concrete member is doubled, and two X-shaped members are arranged. As a result, the number of braces is doubled, and the angle at which the braces are mounted is reduced as compared with the V-shaped arrangement, and the rigidity and proof stress are improved by these effects.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a cross-shaped buckling restraint bracing member according to an embodiment of the present invention. As in the "buckling restraining bracing member" of Japanese Utility Model Publication No. 4-191121, a steel center made of a strip-shaped steel plate is used. The axial force member 2 is inserted into a steel pipe 5 having a square cross section combined in a cross shape, and steel reinforcing rib plates 6 are fixed to both ends of the central axial force member 2 by welding, and the central member 2 and the rib plate 6, an anti-adhesion coating 3 made of asphalt, rubber, acrylic, or the like is applied to a portion located in the steel pipe 5, and concrete 8 is provided between the central axial force members 2 on which the anti-adhesion coating in the steel pipe 5 is formed.
And the concrete 8 and the steel pipe 5 constitute a buckling-restraining concrete member 1 reinforced with steel. FIGS. 2, 3 and 4 show AA cross section, BB cross section and CC cross section in FIG. 1, respectively. By making one strip and two strips in the other direction,
They cross each other at the central intersection without eccentricity. FIG. 5, FIG. 6, and FIG.
It shows another example of -A cross section, BB cross section, and CC cross section. In this case, the steel central axial force member 2 uses two strips in both directions.

In these examples, the buckling restraining concrete member 1 may be made of concrete reinforced with a main reinforcing bar 17 and a hoop bar 18, as shown in FIG. Also, the joint between the buckling restraint bracing member and the main structural member 10 may be based on field welding as shown in FIG.

[0008]

According to the present invention, two buckling-restraining bracing members can be used in a limited area without eccentricity.
The buckling restraint bracing member having high rigidity and proof strength can be configured in the mold.

[Brief description of the drawings]

FIG. 1 is a side view of a cross-shaped buckling restraint bracing member according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a sectional view taken along line CC in FIG. 1;

FIG. 5 is a view showing another example of the AA cross section in FIG. 1;

FIG. 6 is a view showing another example of the BB section in FIG. 1;

FIG. 7 is a view showing another example of the cross section taken along the line CC in FIG. 1;

FIG. 8 is a side view of a conventional buckling restraint bracing member.

FIG. 9 is a diagram showing a first arrangement example of a buckling restraint bracing member in a conventional structural framework.

FIG. 10 is a diagram showing a second arrangement example of a buckling restraint bracing member in a conventional structural frame.

FIG. 11 is a view showing a third arrangement example of a buckling restraint bracing member in a conventional structural frame.

FIG. 12 is a view showing another example of a conventional concrete member for buckling restraint.

FIG. 13 is a view showing another example of a conventional joining method between a buckling restraint bracing member and a structural skeleton.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buckling restraint concrete member 2 Steel central axial force member 3 Adhesion prevention coating 4 Bracing member 5 Steel pipe 6 Reinforcement rib plate 8 Concrete 16 Concrete column 17 Main reinforcing bar 18 Hoop bar 19 Welding

Claims (3)

[Claims] 1. A buckling restraining concrete member 1 reinforced with steel material is integrated in a cross shape, and the concrete member 1
A plurality of steel central axial force members 2 are inserted through at least one side of the steel member, and one or more steel central axial force members 2 are inserted through the other of the concrete member 1, and the surface of the steel central axial force member 2 A cross-shaped buckling restraint bracing member, wherein an anti-adhesion coating 3 is provided between the concrete members 1. 2. A steel central axial force member 2 provided on one side of the concrete member 1 is composed of two flat plates, and the steel central axial force member 2 is made of steel provided on the other side of the concrete member 1. 2. The cross-shaped buckling restraint bracing member according to claim 1, wherein the central axial force member 2 and the anti-adhesion coating 3 are arranged in parallel at a distance corresponding to the thickness of the anti-adhesion coating 3. 3. A steel central axial force member 2 provided on the other side of the concrete member 1 comprises two flat plates.
The steel central axial force member (2) is disposed in contact with the steel central axial force member (2), and an anti-adhesion coating (3) is provided between the surface of the steel central axial force member (2) and the concrete member (1). Cross-shaped buckling restraint bracing member.