JP2715711B2 - Eccentric brace structure with vibration suppression function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric brace structure having a vibration control function.

[0002]

2. Description of the Related Art In middle- and high-rise buildings, a building frame using a brace structure is widely used as a resistance element against a horizontal force such as an earthquake or wind. However, with this brace frame, the shear stiffness of each layer is extremely high, so the rigidity of the entire building is increased and the input of earthquakes is increased, and adverse effects such as the ineffective use of the ramen frame used in combination with the brace frame. It can happen.

Therefore, in recent years, an eccentric brace capable of adding a stable elasto-plastic behavior to a building has been proposed as a structure in which the axes of the columns, beams and braces are not made coincident with each other (Japanese Patent Publication No. 54-32540, JP-A-63-67
No. 382) and have been put to practical use. By the way, typical examples of the eccentric brace include a Y-shaped brace shown in FIG. 5A, a double Y-shaped brace shown in FIG. 5B, and an improved C-shaped brace shown in FIG. Also, the upper end of the mountain-shaped brace 1 or the roof-shaped brace 2 and the beam 3 are connected via a vertical bundle 4.

[0004] The advantages of using the eccentric brace structure include the following: the brace members 1 and 2 do not buckle themselves; the bundle member 4 yields first; Absorbing energy and minimizing damage to major structural members.

[0005]

However, in the case of conventional structures, especially tower-like structures and high-rise buildings, as shown in FIGS. Bending deformation is outstanding. For this reason, there is a problem in that the eccentric brace having the conventional structure that is effective against shear deformation cannot obtain an effective vibration damping action.

FIG. 6A shows the accumulation of shear deformation (indicated by a broken line) and total deformation (indicated by a solid line) to which bending deformation is applied in the entire high-rise building, and FIG.
Shows interlaminar shear deformation [delta] _S, interlayer bending deformation [delta] _B, and the total interlayer variations [delta] _T between the n layer of the high-rise part and (n + 1) layer.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has intended to concentrate bending deformation between a plurality of layers at least in a high-rise portion where bending deformation is more predominant than shear deformation.
Accordingly, it is an object of the present invention to provide an eccentric brace structure having a vibration control function that allows the eccentric brace to function effectively.

[0008]

To accomplish the SUMMARY OF THE INVENTION Such objects, in structures bending from shear deformation deformation dominated toward the upper layer, arranged astride eccentric brace multiple layers, eccentric The braces are
The top and bottom beams are connected to each other vertically.
In the space defined by the following pillars,
At the lower end of the bundled material, it is erected diagonally upward from the lowest beam.
Combine the upper ends of the braces to make the axes of the columns, beams, and braces
The cores do not coincide with each other and the bundle
With high rigidity and low rigidity surrounding the superplastic material and the outer periphery of the superplastic material.
It is characterized by being composed of a proof metal plate .

[0009]

Further, a single-layer eccentric brace is disposed between each layer of the structure.

[0011]

According to the eccentric brace structure having the vibration damping function of the present invention having the above-described structure, the structure in which the bending deformation is more dominant than the shearing deformation as going to the upper floor, particularly such a portion, straddles a plurality of layers. by placing the eccentric bracing Te, bending deformation occurs in each layer, subjected to eccentric brace removed together in multiple layers, by the action of displacement together in multiple layers in this <br/> eccentric brace, the eccentric In order to effectively use the elasto-plastic deformation behavior of the brace, and especially to significantly improve the vibration suppression function in high-rise sections , the bundle material is made of superplastic material.
And a metal plate with high rigidity and small proof strength surrounding the outer circumference
Superplastic material is easily plastically deformed by external force
While exhibiting a damper effect in a small amplitude region,
The high rigidity and low strength metal plate surrounding the superplastic material of
Damping occurs in a vibration region with a large amplitude compared to the vibration damping region of plastic material.
It will exhibit a damper effect. Therefore the amplitude is different
It can control a wide range of vibrations, especially superplastic
Set the vibration damping area on the smaller amplitude side by plastic deformation of the material
Can be controlled even in the case of slight earthquake vibration.
It can greatly contribute to the vibration effect.

Further, by disposing a single-layer eccentric brace between the respective layers of the structure, shear deformation generated between the respective layers can be received by the eccentric brace, and the eccentric brace disposed between the plurality of layers can be received. Together with the behavior of the brace, it is possible to further improve the vibration damping function.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an eccentric brace structure 10 having a vibration damping function according to an embodiment of the present invention. FIG. 1 is a schematic configuration diagram showing a skeleton of a building to which the eccentric brace structure 10 of the present invention is applied. FIG. 3 is a perspective view of a main part of the eccentric brace, and FIG. 3 is a hysteresis characteristic diagram showing elasto-plastic performance of a plurality of members constituting a bundle of the eccentric brace.

That is, the building 12 shown in FIG. 1 is a building such as a tower-like building or a high-rise building. The beams 14, 14,... Provided between the layers are supported by a large number of columns 16a, 16b,. I have. The building 12 constitutes a frame at a portion where the columns 16a, 16b... Are arranged, and in the present embodiment, for example, a first frame A including a column 16a on the near side in the drawing.
And a second frame B constituted by a column 16b on the other side in the figure. Note that the illustrated portion indicates the upper layer portion of the building 12.

In this embodiment, in the second frame B, a plurality of layers (three layers) are defined as one section C, and the section C is straddled between the uppermost beam 14b and the lowermost beam 14a. The first eccentric brace 18 is arranged. The first eccentric brace 18 is located at the lowermost beam 14a of the section C,
The pair of brace members 20, 20 are inclined so as to form a mountain shape from the lower ends of the columns 16b, 16b toward the uppermost beam 14b, and the respective upper ends are joined at positions appropriately separated downward from the uppermost beam 14b. ing. The upper end joints of the brace members 20, 20 are joined to the uppermost beam 14b via a vertically arranged bundle 22.

On the other hand, in the first frame A, small second eccentric braces 24 are arranged between the layers. This second
The eccentric braces 24, 24...
Between the four, the pair of brace members 26, 26 are inclined upward from the lower ends of the columns 16a, 16a in the same manner as the first eccentric brace 18, so that the upper end joints are vertically bundled. It is joined to the upper beam 14 via a member 28.

Incidentally, the first and second eccentric braces 1
As shown in FIG. 2, each of the bundle members 22 and 28 of 8 and 24 is composed of a first metal member 30 and a second metal member 32 having different rigidities and proof stresses. In this embodiment, the brace member 2 is used.
A link portion 34 is provided at the upper end joint of 0, 20 and 26, 26.
The first metal material 3 is provided at the center of the link portion 34.
0, and the second metal member 32 is disposed on both sides of the first metal member 30 so that the first and second metal members 3
0 and 32 are alternately arranged.

A material having a high rigidity and a small proof strength is selected as the first metal material 30, and a material having a low stiffness and a high proof strength is used as the second metal material 32 as compared with the first metal material 30. The material is selected.

In the eccentric brace structure 10 having the vibration damping function of the present embodiment having the above-described configuration, when a horizontal external force (lateral force) such as an earthquake or a strong wind acts on the building 12, when the building 12 is subjected to a horizontal external force (lateral force). Shear forces and bending moments act.

At this time, in the second frame B, the sections C of the three layers in which the first eccentric braces 18 are arranged are connected via the first eccentric braces 18, so that the sections C are united in this section C. Receive lateral force. Therefore, in the section C, three levels of bending deformation can be concentrated and taken out, and the displacement due to the concentration of bending deformation can act on the first eccentric brace 18. That is, when the displacement acts on the first eccentric brace 18, the building material 12 can exhibit a damper effect while deforming, and the building 12 can be damped.

On the other hand, in the first frame A, the second frame provided between the respective layers is provided.
The shear force between the layers acts on the eccentric brace 24, and this second
The bundle 28 of the eccentric brace 24 is also deformed. This bundle 28
By virtue of this deformation, a damper effect can be exerted similarly to the first eccentric brace 18.

Incidentally, in the first eccentric brace 18, since the amount of displacement acting on the bundle 22 is particularly one in which the bending deformation of the high floor is concentrated for three layers, the bundle 28 of the second eccentric brace 24 is formed. Is larger than the amount of displacement acting on. Therefore, the damper effect exerted by the first eccentric brace 18 is large, and it is possible to improve the damping effect of the building 12 as compared with the case where only the second eccentric brace 24 is provided on each level. it can.

Further, since the second eccentric braces 24 are provided on each level together with the first eccentric braces 18, the damping effect of the first eccentric braces 18 is combined with the damping effect of the building 12. It can be further improved.

The first and second eccentric braces 1
Since the bundles 22 and 28 of 8, 24 are composed of the first metal member 30 and the second metal member 32 having different rigidities and proof stresses, the first and second metal members 30 and 32 are rigid and proof stresses. The elasto-plastic performance differs due to the difference in the region where the damper effect is exhibited, that is, each metal material 3
The vibration suppression areas obtained at 0 and 32 are different.

That is, the hysteresis characteristics indicating the elasto-plastic performance of the bundles 22 and 28 are expressed as shown in FIG.
The first metal material 30 having a high rigidity and a small proof strength has a hysteresis characteristic A shown by a broken line in the figure, and the second metal material 32 having a low stiffness and a high proof strength has a hysteresis characteristic B shown by a solid line in the figure. In other words, the first metal material 30 having high rigidity has a small proof stress and exhibits a large damping effect against small-amplitude vibration, whereas the second metal material 32 having low rigidity has a large proof stress and has high resistance against large-amplitude vibration. A large damping effect will be exhibited. Accordingly, the respective metal members 30 and 32 effectively exert the damper function in the vibration areas having different amplitudes as described above, so that the vibration control areas by the damper function exerted by the respective members are secured separately. A wide range of vibration control from small to large earthquakes to large earthquakes, and vibration control by strong winds can be performed. Incidentally, the first metal material 30 and the second metal material 32 can set a region in which the damper effect can be efficiently exhibited by appropriately selecting the rigidity and proof stress in advance.

FIG. 4 shows another embodiment, in which the same components as those in the above-mentioned embodiment are denoted by the same reference numerals, and the description will not be repeated.

That is, in this embodiment, the superplastic material 3 having low rigidity and high proof strength such as lead or superplastic alloy is formed on the link portion 34.
6 and the outer periphery of the superplastic material 36 is surrounded by a metal plate 38 having a high rigidity and a small proof stress, so that the bundle 2
2 and 28.

Therefore, in this embodiment, the superplastic material 36 is
Since it is easily plastically deformed by an external force acting, the superplastic material 36 exhibits a damper effect in a smaller amplitude region, and can greatly contribute to vibration suppression even in a small earthquake motion. Since the metal plate 38 surrounding the superplastic material 36 has high rigidity, the metal plate 38 exerts a damper effect in a vibration region having a larger amplitude than the vibration control region of the superplastic material 36.

In each of the above embodiments, the case where the first eccentric brace 18 is disposed on the high part of the building 12 is disclosed. However, it is also possible to apply the present invention to the low and middle parts. Not even. Further, although the section C in which the first eccentric braces 18 are arranged is three layers, it is needless to say that the section C is not limited to this and may be two layers or four layers or more. Further, the eccentric braces 18 and 24 of this embodiment
Although the case where a Y-shaped brace is applied has been disclosed, it is needless to say that the present invention is not limited to this and can be applied to the present invention even in other eccentric brace structures shown in FIGS. 5 (B) and 5 (C). is there.

[0030]

As described above, according to the eccentric brace structure having the vibration damping function of the present invention, as it goes to the upper floor,
Structures where bending deformation is more pronounced than shear deformation, especially
An eccentric brace is placed across multiple layers
The bending deformation that occurs for each layer is collectively collected between multiple layers.
To be received by the eccentric brace and put together between multiple layers
The displacement acts on this eccentric brace,
The elasto-plastic deformation behavior of the
In order to greatly improve the vibration control function in
Has high rigidity surrounding the superplastic material and its outer periphery and has low proof stress
Super-plastic material is easy to use due to external force
Deforms plastically and exhibits damper effect in small amplitude range
On the other hand, high-rigidity, low-strength metal surrounding this superplastic material
The plate has a large plate width compared to the vibration control region of the superplastic material.
The damper effect is exhibited in the moving region. Therefore
A wide range of vibrations with different widths can be controlled.
In addition, due to the plastic deformation of the superplastic material,
Can be set to
However, it can greatly contribute to the damping effect.

Further, by arranging a single-layer eccentric brace between the respective layers of the structure, shear deformation generated between the respective layers can be received by the eccentric brace, and the eccentric brace disposed between the plurality of layers can be received. Together with the behavior of the brace, it is possible to further improve the vibration damping function.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a main part of an embodiment of a building to which an eccentric brace structure having a vibration damping function according to the present invention is applied.

FIG. 2 is a perspective view of an essential part showing an embodiment of an eccentric brace structure.

FIG. 3 is a hysteretic characteristic diagram showing the elasto-plastic performance of a bundle having an eccentric brace structure.

FIG. 4 is a perspective view of a main part corresponding to FIG. 2, showing another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a general example of an eccentric brace.

FIG. 6 is a characteristic diagram showing the relationship between the overall displacement and the interlayer displacement of a conventional high-rise building.

[Explanation of symbols]

Reference Signs List 10 Eccentric brace structure 12 Building 14, 14a, 14b Beam 16a, 16b
Column 18, 24 Eccentric brace 20, 26 Brace member 22, 28 Bundle material 30 First metal material 32 Second metal material 36 Superplastic material 38 Metal plate

Claims (2)

(57) [Claims] An eccentric brace straddling a plurality of layers is disposed in a structure in which bending deformation is more predominant than shearing deformation toward an upper layer, and the eccentric brace is provided in the plurality of layers.
The top and bottom beams are connected to each other vertically.
In the space defined by the following pillars,
At the lower end of the bundled material, it is erected diagonally upward from the lowest beam.
Combine the upper ends of the braces to make the axes of the columns, beams, and braces
The cores do not coincide with each other and the bundle
With high rigidity and low rigidity surrounding the superplastic material and the outer periphery of the superplastic material.
An eccentric brace structure with a vibration damping function, which is made of a tough metal plate . 2. A single-layer structure is provided between each layer of the structure.
The eccentric brace is disposed.
Eccentric brace structure with on- board vibration control function.