JP2002235795A - Vibration suppressing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration suppressing device which can suppress acceleration caused by an earthquake to a building by a simple constitution. SOLUTION: A plate 132 is mounted on elastic units 152, 154, 156, and 158 fixed to a bottom surface 120 in a box 110. The elastic units 152 to 158 and the plate 132 are fixed. Elastic units 162, 164, 166, and 168 are fixed to the plate 132. A plate 134 is fixed to the elastic units 162 to 168, a weight 140 is fixed onto the plate 134. The elastic units 152 to 158 constitute a first isolator, the elastic units 162 to 168 constitute a second isolator. The elastic units 152 to 158 and the elastic units 162 to 168 are different in rigidity. An earthquake control function is accomplished by the actious of these two kinds of isolators.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control device for reducing deformation of a building due to an earthquake, and more particularly to a vibration control device capable of reducing deformation by adding to an existing building.

2. Description of the Related Art When an earthquake occurs, an acceleration is applied to the building due to the vibration, and the building is deformed by the acceleration. Due to the deformation of the building, an increase in the deformation leads to the destruction of the building. In particular, wooden buildings have
It has a period of 0.3 seconds to 0.4 seconds, and if there is an earthquake having the same period as the natural period, the deformation generated in the building in synchronization with the earthquake increases, and the building is often destroyed.
Conventionally, in order not to cause this deformation, for example, a device has been devised for the building itself, and an attempt has been made to control the acceleration with respect to the building. The device (vibration control device) for controlling the acceleration of the building is a device for reducing the deformation of the building by shifting the period of the building and preventing the building from being destroyed. However, earthquake countermeasures by the building itself need to be performed at the construction stage, and it is difficult to apply it to existing buildings. Further, a device for controlling an acceleration with respect to a building is often huge or complicated and expensive, and there is no device suitable for a small building such as a wooden building.

[0002]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration control device capable of controlling the acceleration of a building due to an earthquake with a simple configuration.

In order to achieve the above object, the present invention provides an elastic body forming a first isolator fixed to a substrate, and a connecting portion fixed to the first isolator. And a resilient member fixed to the connection portion and constituting a second isolator; and a passive weight connected to the connection portion by the second isolator. It is. The elastic bodies constituting the first isolator and the second isolator preferably have different rigidities. Also,
By installing two of the vibration control devices as a pair in a building, it is possible to more effectively perform a vibration control action.

[0003]

Embodiments of the present invention will be described in detail with reference to the drawings. The present invention is a vibration control device using a passive weight. An example of the structure of the vibration control device of the present invention
This will be described in detail with reference to FIG. FIG. 1 (a) and FIG.
(B) is a sectional view of the vibration damping device of the present invention. Figure 1
1A is a cross-sectional view of a side surface, and is a cross-sectional view taken along line BB of FIG. 1B. FIG.
It is sectional drawing in the line shown by AA of (a). Figure 1
1A and 1B, a bottom surface 120 is provided in a housing 110.
Elastic bodies 152, 154, 156, 15 fixed to
8, a plate 132 is placed. Elastic bodies 152 to 15
8 and the plate 132 are fixed. Elastic body 1 on plate 132
62, 164, 166, 168 are fixed. A plate 134 is fixed to the elastic members 162 to 168, and a weight 140 is fixed on the plate 134. Elastic body 15
2 to 158 constitute a first isolator, and the elastic bodies 162 to 168 constitute a second isolator. The elastic members 152 to 158 and the elastic members 162 to 168 have different rigidities. The vibration control device of the present invention is characterized in that the weight 140, which is a passive weight, is indirectly supported by two types of isolators having different rigidities. How these two types of isolators function to achieve the vibration control function will be described in detail with reference to FIG.

FIGS. 2A to 2I are diagrams for explaining how the vibration damping device of the present invention operates and performs vibration damping when an earthquake occurs. . FIG. 2 (a)
Is a stationary state, which is a stationary state. In this state, an earthquake occurs. FIG. 2B is a diagram when an earthquake occurs. First, a rightward acceleration is shown. At this time, as shown in FIG. 2B, only the elastic members 152 to 158 constituting the first isolator are deformed, and the action of the inertia force of the weight 140 and the action of the two isolators are performed. The weight 140 is not moving. FIG.
(C) shows a case where the inertial force at the time of applying a force to the right becomes maximum. At this time, the weight 140 has not yet moved, but the elastic members 162 to 162 constituting the second isolator have not yet moved.
168 is also deformed. FIG. 2D shows the elastic members 152 to 158 and the elastic members 162 to 162 due to the seismic force.
Reference numeral 168 indicates a state in which it moves to the right at the maximum speed, and at this time, the external force is zero. Weight 140 is moving to the right. Then, in FIG. 2E, a force to the left side starts. Weight 140 is still moving to the right. FIG.
(F) shows a case where the inertial force is maximized when a leftward force is applied. FIG. 2G shows a state in which the force is still being applied to the left side, and at this time, the weight 140 has returned to the center. Then, in FIG. 2 (h), the force to the right side starts, and at this time, the weight 140 is moving to the left side. FIG.
(I) shows a case where the inertial force is maximized when the rightward force is applied. As can be seen from these figures, in the vibration control device of the present invention, two types of vibration modes are generated by using elastic bodies having different rigidities. Due to the interaction of the generated inertial forces, a decrease in the inertial resistance to the input seismic wave can be suppressed. For this reason, the vibration control device of the present invention can make the period of the building not coincide with the period of the seismic wave by shifting the period of the building, and can absorb the seismic energy for a longer time.

[0005] The vibration damping device of the present invention can be used in combination. FIG. 3 is a diagram showing a state in which the vibration damping device of the present invention is installed as a paired structure on a roof structure often seen in a wooden house. As shown in FIG. 3, the seismic devices 200 and 300 are paired and installed in accordance with the roof ridge structure. In this way, by installing the aseismic device symmetrically at the ridge position, it is possible to perform the vibration control in a well-balanced manner, and it is possible to efficiently absorb the force of the earthquake without causing torsion. Also, since the two vibration damping devices are combined and installed symmetrically, the structure is difficult to fall off the roof. In addition, the combination of the two damping devices also has the effect of increasing the horizontal inertia of the passive weights 240 and 340.

[0006]

According to the present invention, the above-described vibration damping device of the present invention can efficiently control a seismic wave with a simple configuration. Also, by installing two as a pair,
It is possible to control the vibration efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the structure of a vibration control device of the present invention.

FIG. 2 is a diagram showing the movement of the vibration damping device of the present invention during an earthquake.

FIG. 3 is a diagram showing an installation example of a vibration control device of the present invention.

[Explanation of symbols]

 110 case 120 bottom surface 132 plate 134 plate 152, 154, 156, 158 elastic body 162, 164, 166, 168 elastic body

Claims (3)

[Claims] An elastic body constituting a first isolator fixed to a substrate; a connecting portion fixed to the first isolator; a second fixing portion fixed to the connecting portion;
A vibration damping device, comprising: an elastic body constituting the isolator of (1); and a passive weight connected to the connection portion by the second isolator. 2. The vibration damping device according to claim 1, wherein the elastic bodies constituting the first isolator and the second isolator have different rigidities. 3. A vibration damping device characterized in that two of the vibration damping devices according to claim 1 or 2 are installed in a building as a pair.