JPH10196720A - Passive vibration control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp small strain between floors by adding auxiliary structural members such as a vibration-resistant wall or braces to main structural members such as columns or beams of a structure, securing either the upper or lower end of the auxiliary structural section to a floor diaphragm, and connecting the other end, with a damping element inserted in between, to a separate floor diaphragm. SOLUTION: A vibration-resistant wall and braces built in a truss-shape are used as auxiliary structural members, and the vibration-resistant wall (an auxiliary structural member) is connected to steel beams 2 which form the main structural members of a structure, via a damping element 5. When a multistory structure such as a building vibrates due to an earthquake or wind, the horizontal deformation of the structure appears mainly in the shearing deformation between upper and lower floor diaphragms. Therefore, this small shearing deformation occurring between the diaphragms is concentrated on the thin damping element 5 using the auxiliary structural members which hardly deform, so that the damping element 5 exerts its damping performance by a large shearing strain being applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called passive vibration damping system (method, structure and method) in which vibration generated in a layered structure by disturbance such as earthquake or wind is attenuated by a device that does not require special control. Material).

[0002] The present vibration damping system can be applied to a wide range of fields such as civil engineering, construction and machinery, whether it is a multi-layered or single-layered structure. Effective for multi-layered structures composed of floors.

[0003] In the frame structure, in the vibration of a multilayer structure composed of a relatively rigid floor diaphragm (a surface composed of beams and a floor) and relatively soft columns, horizontal vibration occurs between the upper diaphragm and the lower diaphragm. A vibration mode in which shear deformation occurs in the direction tends to occur. By installing this vibration damping device (structure) between the layers, it absorbs vibration energy inside the structure,
It can be used to reduce vibration early.

[0004] This vibration damping system is particularly suitable for a structure having a seismic isolation structure, such as a skyscraper, which is difficult to suppress externally, and which has a long natural period and a small internal damping. .

[0005]

2. Description of the Related Art Conventional seismic design of architectural structures includes two types of design concepts, a rigid structure for robustly receiving seismic force and a flexible structure for softly receiving seismic forces, and is used depending on the type and shape of the structure. .

On the other hand, as a new seismic structure, a seismic isolation device is installed between the lower structure and the upper structure to temporarily cut off the flow of seismic force transmitted from the ground, or provided inside the structure. A vibration control structure for controlling an earthquake response or a wind response by using the provided vibration control device has been realized.

Further, there are two types of vibration control: active vibration control in which control is performed variably and independently according to the response state, and passive vibration control in a state where the vibration control device is initially set, depending on the method of controlling the vibration response of the structure. Is divided into passive vibration suppression that is to be controlled.

In addition, as a method of applying a physical force to the vibration control, a method of suppressing the vibration by applying an inertial force to the top floor or the like which is the antinode of the vibration mode, and a method of suppressing the deformation between the layers of the middle floor. There is a method of controlling to suppress vibration.

[0009]

In the conventional vibration damping structure, it is necessary to newly install a vibration damping device or to set a special structure, and the space and load of the vibration damping device are reduced. There was a downside to increase. Also, in the method of controlling the deformation between layers, the amount of interlayer deformation of a multilayer structure such as a building is small, and it is difficult to obtain a sufficient effect even if the vibration between layers is suppressed.

[0010] The system to be solved by the present invention is a kind of passive vibration suppression for suppressing vibration due to interlayer deformation, but only a simple structural improvement without using an extra device such as a vibration suppression device. It is intended to obtain a high damping effect by giving a damping force to slight deformation between layers.

[0011]

Means for achieving the above object will be described with reference to FIGS. 1 and 2.

A main structural member such as a pillar 1 or a beam 2 constituting a basic structure of a skeleton is provided with a sub-structural member such as an earthquake-resistant wall 3 or a brace 4. And the other end not fixed is joined to another floor diaphragm with a damping material (damping element 5) interposed therebetween. However, although the structure is slightly complicated, the same damping effect can be expected in a structure in which the upper and lower ends of the sub-structure portion are fixed and the damping element is sandwiched in the middle, or a structure in which the damping element is sandwiched between the upper and lower ends.

In the above-mentioned structure, it is reasonable to structurally support the vertical load of the skeleton in both the main structural part and the sub structural part. However, the same damping method is used in the method in which the vertical load is not supported by the sub structural part. The effect is obtained. In either method, the substructure part is a part that does not assume shear deformation, and the left and right ends of the substructure part must be structures that are mechanically independent from the main structure part so that they are not affected by deformation of the skeleton. No.

It is important that the substructure does not easily undergo shear deformation, and a suitable member is an earthquake-resistant wall or a truss-shaped brace. What kind of member should be used should be selected according to conditions such as the availability of the structure and the structure of the frame (reinforced concrete or steel frame).

The material used for the damping element is a high damping rubber used for the seismic isolation device when the substructure supports the vertical load, and a high damping rubber or highly plastic lead is used for the method not supporting the vertical load. Is considered appropriate.

[0016]

The operation of the present invention will be described with reference to FIG. 3. When a multilayer structure such as a building vibrates due to an earthquake, wind, or the like, horizontal deformation of the skeleton mainly occurs between the upper and lower floor diaphragms 6 as shown in the figure. Appears as shear deformation. The slight shear deformation between the layers is concentrated on the thin damping element 5 using a sub-structure member that is not easily deformed, and a large shear strain is applied to the damping element as shown in the drawing to exert the damping performance. Is a system.

The damping performance between the layers can be arbitrarily given by changing the thickness and the effective area of the damping element in addition to the performance of the material used as the damping element. The level of the damping performance between the layers may be determined in consideration of the vibration characteristics of the entire structure.

Whether the sub structural member supports the vertical load or does not support the vertical load may be determined in consideration of the vibration characteristics of the entire structure.

[0019]

Embodiments will be described with reference to the drawings. In FIGS. 1 and 2, columns 1 and beams 2 of the main structural members are basic structural members that support the load of the skeleton, and are portions that deform and vibrate due to disturbance such as an earthquake or wind.

In the figure, one of the upper and lower ends of the earthquake-resistant wall 3 and the brace 4 is joined to the damping element 5 and the other end is fixed to the main structural member, but both upper and lower ends are joined to the damping element. However, the damping element may be interposed between the upper and lower ends. The left and right ends of the shear wall do not contact the main structural members.

[0021]

The present vibration damping system does not require any special vibration damping device, is a simple structure and has no waste in attenuating slight distortion between layers, and is expected to be realized at a small cost. .

In particular, the vertical load can be shared by the sub-structure members, so that the amount of columns of the main structure members can be reduced, and therefore, the natural period of the frame is lengthened like a flexible structure, and the seismic load applied to the structure is reduced. This can be expected to have the effect of reducing the cost and improving the earthquake resistance at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view when an earthquake-resistant wall is used as a sub structural member.

FIG. 2 is a perspective view when a brace is used as a sub structural member.

FIG. 3 is an elevation view when the vibration damping structure undergoes shear deformation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Earthquake-resistant wall 4 Brace 5 Damping element 6 Floor diaphragm

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[Procedure amendment]

[Submission date] June 29, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

The present invention relates to an interlayer deformation vibrations occurring in a structure that forms a layer in the vertical direction by a disturbance such as earthquakes and wind, is attenuated by the device which does not require special control,
It relates to a so-called passive damping system ( damping method, structure and material).

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

In THE INVENTION Problems to be Solved] damping structure it has been proposed, the Luke with a new damping apparatus, or <br/> must configure special structure, the vibration damping device The downside was that space and load increased.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

Means for Solving the Problems FIGS. 1 and 2 , and
With reference to FIG. 4 , a solution for achieving the above object will be described.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012] The main structural members such as columns 1 and beams 2 forming the basic structure of the skeleton, then adding auxiliary structural members such as shear walls 3 and brace 4, the upper end or the main structural part of the lower end of the auxiliary structure portion principle A structure in which a material having a damping property (damping element 5) is narrowed while supporting the load and the other end not fixed is joined to another floor diaphragm. However, although the structure is slightly complicated, the same damping effect can be expected in a structure in which the upper and lower ends of the auxiliary structure portion are fixed and the damping element is narrowed in the middle, or a structure in which the damping elements are narrowed at the upper and lower ends.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

In the above structure, a load is applied to the auxiliary structure portion.
Although a method that does not support is already proposed, the present invention
Your vertical load of the building frame to both of the main structure portion and the auxiliary structure portion
And horizontal load support for structural rationalization
It is what we are trying to figure out. Here, the auxiliary structure portion is a portion that does not assume shear deformation, and the left and right ends of the auxiliary structure portion must be mechanically independent of the main structure portion so as not to be affected by deformation of the skeleton.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

It is important that the auxiliary structure does not easily undergo shear deformation, and a suitable member is an earthquake-resistant wall or a truss-like brace. FIG. 4 shows the steel beam 2
This is an example of a structure for connecting to a shear wall via a damping element 5.
And is connected to the earthquake-resistant wall by the flange 7. The type of material to be used depends on conditions such as the availability of the structure and the structure of the frame (reinforced concrete or steel frame).
The optimal combination should be selected.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The damping element has a combined damping constant of 10% or more.
High damping rubber, which is a rubber, is considered suitable. Also, the main structure
As shown in FIG. 4, the vibration damping device connecting the structural member and the auxiliary structural member
With the damping element 5 narrowed to a part of the floor diaphragm such as a beam
Devices that connect the earthquake-resistant walls are conceivable.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

[0016]

The operation of the present invention will be described with reference to FIG. 3. When a multilayer structure such as a building vibrates due to an earthquake, wind, or the like, horizontal deformation of the skeleton mainly occurs between the upper and lower floor diaphragms 6 as shown in the figure. Appears as shear deformation. The slight shear deformation between the layers is concentrated on the thin damping element 5 by using the auxiliary structural member which is not easily deformed, and a large shear strain is applied to the damping element as shown in the drawing to exhibit the damping performance. Is a system.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The damping performance between the layers can be arbitrarily given by changing the thickness and the effective area of the damping element in addition to the characteristics inherent to the material used as the damping element. The level of the damping performance between the layers may be determined in consideration of the vibration characteristics of the entire structure.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

Further, the auxiliary structural member may be a vertical load or
In the case where the horizontal load is not supported, the method may be similarly determined in consideration of the vibration characteristics of the entire structure.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

The earthquake-resistant wall 3 and the brace 4 of the auxiliary structural member are
In the figure, one of the upper and lower ends is joined to the damping element 5 and the other end is fixed to the main structural member. However, the damping element may be joined to the damping element at both upper and lower ends or may be sandwiched between the upper and lower ends. Absent. The left and right ends of the shear wall do not contact the main structural members.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

In particular, by sharing the load on the auxiliary structural member, the amount of columns of the main structural member can be reduced , and thus the natural period of the frame is lengthened to reduce the seismic load applied to the structure. This can be expected to have the effect of reducing the cost and improving the earthquake resistance at the same time.

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a perspective view when an earthquake-resistant wall is used as an auxiliary structural member.

FIG. 2 is a perspective view when a brace is used as an auxiliary structural member.

FIG. 3 is an elevation view when the vibration damping structure undergoes shear deformation.

FIG. 4 is a perspective view of a vibration damping device and a beam.

[Description of Signs] 1 pillar (main structural part) 2 beam (main structural part) 3 earthquake-resistant wall (auxiliary structural part) 4 brace (auxiliary structural part) 5 damping element 6 floor diaphragm (main structural part) 7 connecting flange

[Procedure amendment 15]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Added

[Correction contents]

FIG. 4

Claims (3)

[Claims] 1. A system for attenuating horizontal vibration of a structure, comprising: a main structural member that supports a vertical load and a horizontal load; and a sub structural member that supports a vertical load but does not deform in the horizontal direction. By joining the main structural member and the sub-structural member via a damping material (damping element),
The difference in displacement between the main structural member that undergoes shear deformation due to horizontal vibration of the structure and the sub-structural member that does not easily deform is converted into distortion of the damping element interposed between them, and energy is absorbed, and the vibration of the structure Damping method for reducing vibration and its structure. 2. The damping element according to claim 1, wherein a high damping rubber is used. 3. The vibration damping method according to claim 1, wherein the sub-structure member does not support a vertical load.