JP3474743B2 - Cross-shaped buckling restraint bracing members - Google Patents

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 forces such as seismic force and wind force in buildings and other structures.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a conventional buckling restraint bracing member described in Japanese Utility Model Publication No. 4-19121, and other various similar types are known. There is. In FIG. 8, a steel central axial force member 2 is inserted through a buckling restraint concrete member 1 reinforced with a steel material, and a steel reinforcing rib plate 6 is fixed to an end of the steel central axial force member 2. ing. Further, a cross-shaped steel fitting 11 is fixed to the beam 10 of the steel structure by welding, and the fitting 11 and the rib plate 6 are connected by a steel joint plate 12 and a bolt 13.

[0003]

Since all conventional buckling restraint bracing members are made of a single material, it is necessary to mount them to a structure as shown in FIG. 9 or 10. Here, 10a is a column or beam structural member, and 4 is a buckling restraint bracing member. The most basic arrangement is shown in Fig. 9, but if the required rigidity or proof stress is not sufficient in a limited structural frame area, use the procedure shown in Fig. 10. The number of attachments can be increased. However, in the arrangement shown in FIG. 10, since the mounting angle in the vertical direction becomes steep, the rigidity and yield strength of the braces become poor, and the bracing member length excluding a certain joint length becomes short, thereby absorbing energy. There is a problem of reduced ability. On the other hand, when two buckling restraint braces are alternately arranged in a cross shape (X-shape) as shown in FIG. 11, these problems are solved, but two buckling restraint bracing members 4 are provided. Since it is necessary to shift and intersect,
Eccentricity occurs outside the frame structure, which makes it difficult to design the joint and each member.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cross-shaped (X-shaped) buckling restraint bracing member capable of advantageously solving the above-mentioned problems. With regard to the invention of claim 1, the gist of the invention is that the buckling restraining concrete member 1 reinforced with steel material is integrated into a cross shape, and the cross shape of the concrete member 1 is
A plurality of steel central axial force members 2 are inserted into the buckling restraint concrete member 1 in at least one of the two constituting directions to form a cross shape of the concrete member 1.
In the other direction of the two directions, one or more steel central axial force members 2 are provided in the buckling restraint concrete member 1 and
So as to intersect the plurality of steel central axial force members 2 in one direction
And an anti-adhesion coating 3 is provided between the surface of the steel central axial force member 2 and the concrete member 1. With regard to the invention of claim 2,
It said one steel center axis force member 2 provided in the direction of the concrete member 1 is made of two flat plates, steel center provided the steel center axis force member 2 in the other direction of the concrete member 1 The 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. Further, according to the invention of claim 3, the steel central axial force member 2 provided in the other direction of the concrete member 1 is 2
It is composed of one flat plate, the two steel central axial force members 2 are arranged in contact with each other, 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 characterized by.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The rigidity and yield strength of buckling restraint bracing members are determined by the sectional area of the steel central axial force member, the number of braces,
And proportional to the looseness of the mounting angle. In the present invention, by using a plurality of flat plates by the above means, the sectional area of the steel central axial force member included in one buckling restraining concrete member is doubled, and two X-shaped arrangements are provided. As a result, the number of braces is doubled, and the bracing angle of the braces is gentler than in the V-shaped arrangement, and these effects improve rigidity and proof stress.

[0006]

The present invention will now be described in detail with reference to the examples shown in the drawings. FIG. 1 shows a cross-shaped buckling restraint bracing member according to one embodiment of the present invention, and like the “buckling restraining bracing member” in Japanese Utility Model Publication No. 4-19121, a steel center made of strip steel plate. The axial force member 2 is inserted through 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. 6 is coated with an adhesion preventive film 3 made of asphalt, rubber, acrylic or the like in a portion of the steel pipe 5 located inside the steel pipe 5, and concrete 8 is provided between the central axial force members 2 on which the adherence preventive film 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 a steel material. 2, FIG. 3, and FIG. 4 show AA cross section, BB cross section, and CC cross section in FIG. 1, respectively, in which the steel central axial force member 2 in the steel pipe is moved in one direction. By using one strip and two strips in the other direction,
They intersect each other at the central intersection without eccentricity. 5, FIG. 6 and FIG. 7 are respectively A in FIG.
It shows another example of the -A cross section, the BB cross section, and the 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 by main reinforcing bars 17 and hoop reinforcing bars 18 as shown in FIG. 12, instead of steel tube concrete. Further, the joining portion between the buckling restraint bracing member and the main structural member 10 may be based on in-situ welding as shown in FIG. 13, instead of bolt joining.

[0008]

EFFECTS OF THE INVENTION According to the present invention, two buckling restraint bracing members can be connected to each other in a limited area without causing eccentricity.
It is possible to dispose them in a mold, and it is possible to configure a buckling restraint bracing member having high rigidity and proof stress.

[Brief description of drawings]

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

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

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

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

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

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

FIG. 7 is a diagram showing another example of a CC cross section in FIG. 1.

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

FIG. 9 is a view showing a first arrangement example of buckling restraint bracing members in a conventional structural frame.

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

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

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

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

[Explanation of symbols]

1 Buckling restraint concrete member 2 Steel central axial force member 3 Anti-adhesion coating 4 Brace members 5 steel pipe 6 Reinforcing rib plate 8 concrete 16 Concrete columns 17 Main rebar 18 hoop muscle 19 Welded joint

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-240743 (JP, A) JP-A-5-113054 (JP, A) Actually open 63-101603 (JP, U) Actually open 6- 87501 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1 / 58,1 / 18,1 / 24 E04B 2/56 651 E04H 9/02 311

Claims (3)

(57) [Claims] 1. A buckling restraining concrete member 1 reinforced with steel material is integrated in a cross shape, and the concrete member 1
At least one of the two directions forming the cross shape
A plurality of steel center axis force member 2 is buckling constraining concrete
It is inserted into member 1, cross of the concrete member 1
One or more a steel center axis force member 2 is the buckling-restrained concrete member 1 in the other direction of the two directions constituting a
Intersect with the plurality of steel central axial force members 2 in one direction.
A cross-shaped buckling restraint bracing member, which is inserted so as to be inserted, and has an adhesion preventing coating 3 provided between the surface of the steel central axial force member 2 and the concrete member 1. 2. A steel central axial force member 2 provided in one direction of the concrete member 1 is composed of two flat plates,
The steel central axial force member 2 is the other of the concrete member 1
Central axial force member 2 and anti-adhesion coating 3 provided in the direction
The cross-shaped buckling restraint bracing member according to claim 1, wherein the cross-shaped buckling restraint bracing members are arranged in parallel at a distance corresponding to the thickness of the. 3. A steel central axial force member 2 provided in the other direction of the concrete member 1 is composed of two flat plates,
The two steel central axial force members 2 are arranged in contact with each other, and an adhesion preventive coating 3 is provided between the surface of the steel central axial force member 2 and the concrete member 1. The cross-shaped buckling restraint bracing member described in 2.