JPS6367382A - Earthquakeproof engine frame with brace - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an earthquake-resistant frame used for medium-to-high-rise buildings, and more specifically to an earthquake-resistant frame with braces.

(Prior art) In recent years, various developments have been made regarding the earthquake-resistant structures of medium- and high-rise buildings, and among these, rigidity,
There is a braced frame with excellent strength and toughness.

As a conventional example of these braced frames, as shown in FIG. 2, a pair of braces 3 rise obliquely from the lower ends of opposing columns 1-1 toward the beams 2 between them.
Japanese Patent Publication No. 50-32539 discloses an earthquake-resistant frame in which the upper ends of three members are connected to each other and the upper ends are connected to a beam via a single vertical bundle member 4.

Since the earthquake-resistant frame shown in Fig. 2 cannot have a wide opening in the structural surface, as shown in Fig. 3, it is necessary to open the An earthquake-resistant frame can be considered in which the upper ends of a pair of diagonally rising braces 3-3 are separated from each other and directly connected to a beam.

Furthermore, as shown in FIG. 4, the upper ends of a pair of braces 3-3, which rise obliquely from the lower ends of the opposing pillars 1-1 toward the beam 2 between them, are connected to the beams 2 at their joints. A brace 3- is connected to each other, and a brace 3-
Japanese Patent Publication No. 50-5493 discloses a modified example of an earthquake-resistant bridge in which diagonal members 5-5 are connected to the diagonal members 5-5 extending substantially at right angles to the bridges.

(Problems to be Solved by the Invention) The conventional seismic bridge shown in FIG.
3 and the beam 2, the rigidity and proof stress can be adjusted and relatively stable elastic-plastic behavior can be maintained. There is a problem in that it is difficult to apply to large spans because it is difficult to secure. Furthermore, since there is only one bundle material 4, the above-mentioned adjustment of the rigidity and yield strength only depends on the length and cross-sectional area of the bundle material 4, so the adjustment of the rigidity and yield strength is relatively narrow. It was limited.

On the other hand, in the earthquake-resistant frame shown in Figure 3, the rigidity and strength are adjusted by the length of the beam center between the upper ends of the pair of braces 3-3. There was a problem that caused damage to the

In addition, the stiffness and strength of the earthquake-resistant bridge shown in Figure 4 are as follows:
This is determined by the material, shape, and cross-sectional area of the diagonal member 5-3 and the diagonal member 5-5, and it is almost impossible to adjust them, which poses the problem of damage to beams and walls caused by earthquakes.

The present invention was made in view of the above-mentioned problems.
The purpose is to provide an earthquake-resistant frame with braces that allows appropriate adjustment of rigidity and proof stress, has an extremely wide adjustment range, has stable elastic-plastic behavior, and can be applied to bridges with large spans. It is in.

(Means for Solving the Problems) In order to achieve the above object, the seismic frame with braces according to the present invention includes a pair of braces that rise obliquely from the opposing lower ends toward the beams between them. The upper ends are connected to the beams through a pair of vertical bundle members, and are connected to each other through horizontal connecting members.

(Function) When seismic force is applied to the seismic structure with braces of the present invention, the bundle material and/or the tie material is designed to yield before the brace buckles, and the rigidity is adjusted and stable elastic-plastic behavior is achieved. and absorb earthquake energy.

(Example) A preferred example of the present invention will be described below with reference to the attached FIG. 1.

The earthquake-resistant frame according to the present invention diagonally extends a pair of braces 3-3 from the lower ends of a pair of columns 1-1 facing each other toward a beam 2 installed between the upper ends of the columns 1-1. , both braces 3
The upper ends of the braces 3-3 are integrally connected to the beams 2 through vertical bundle members 4a-48, and the upper ends of both braces 3-3 are connected to each other through horizontal connecting members 6. As a result, a rectangular bridge portion 7 is formed by the pair of bundle members 4a-4a, the connecting member 6, and the beam 2.

When an earthquake force is applied to the earthquake-resistant frame of the present invention, the bundle members 4a-4a and/or the tie members 6 yield before the braces buckle. Therefore, the lengths and cross-sectional shapes of these bundle materials 4a-4a and connecting materials 6,! By changing the li area and the angle of the brace 3-3, the rigidity can be adjusted, and stable elastic-plastic behavior can be ensured.
It can absorb various types of energy during earthquakes.

(Effects) As described above, in the earthquake-resistant frame of the present invention, the pair of bundle members 4a-
Since the rectangular bridge portion 7 is formed by the connecting member 4a, the connecting member 6, and the beam 2, the bridge portion 7 can be made to yield before the brace 3-3 buckles. Therefore, by appropriately setting the shape of this bridging section 7 and the cross-sectional area of the bundle materials and connecting materials constituting it, it is possible to adjust the rigidity and proof stress, ensure stable elastic-plastic behavior, and reduce earthquake energy. can be absorbed effectively. In particular, since the degree of freedom in designing the rigidity and proof stress of this bridge section is extremely wide, a wide range of elastic-plastic behavior can be obtained.

In addition, by ensuring stable elastoplastic behavior as described above,
It can prevent damage to beams and floors caused by earthquakes.

If bundles or tie materials are damaged by an earthquake, the building's earthquake resistance can be restored simply by replacing these members.

Furthermore, the earthquake-resistant frame of the present invention has a large opening (and can be applied to bridges with large spans).

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the earthquake-resistant bridge according to the present invention, Figures 2-
FIG. 4 is an explanatory diagram of a conventional earthquake-resistant bridge. 1・・・・・・・・・Pillar 2・・・・・・・・・
・Beam 3・・・・・・Brace 4, 4a・
・Bundle material 6・・・・・・Binding material

Claims (1)

[Claims] (1) In an earthquake-resistant frame used for medium-to-high-rise buildings, etc., the upper ends of a pair of braces that rise diagonally from the lower ends of opposing columns toward the beams between them are connected to the beams through a pair of vertical bundles. An earthquake-resistant structure with braces, which is characterized by being connected to the ground and connected to each other via horizontal connecting materials.