JPH03247871A - Vibration isolator with elastoplastic damper - Google Patents

Abstract

PURPOSE:To permit the vibration and rocking of a building to be reduced by a method in which an elastoplastic damper set connectively between a foundation and a building is controlled to separate it from the foundation or the building as needed when earthquake occurs. CONSTITUTION:A laminated rubber layer 3 as an isolator to support a building 2 on the foundation 1 is provided. An elastoplastic damper capable of connecting or separating the foundation 1 and the building 2 and an operator capable of connecting or separating between the building 2 and the foundation 1 are provided. The operator is controllably worked on the basis of the outputs of seismographs 15 and 16 by means of a controller 17 to separate the damper from the building 2 or the foundation 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vibration damping device having a damper made of an elastoplastic material for reducing the shaking of a building during an earthquake.

<Conventional technology> Conventionally, this type of vibration damping device has been equipped with a semi-circular steel rod that constantly connects the foundation and the building, and absorbs the energy of the shaking of the building through elastic-plastic deformation of the steel rod during an earthquake. There are some structures designed to prevent buildings from shaking violently.

<Problem to be solved by the invention> However, in the conventional vibration damping device described above, since the building and the foundation are always connected by steel rods, ground shaking during an earthquake is transmitted to the building through the steel rods. This causes the problem of increasing the shaking of the building in the early stages of an earthquake.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration damping device that can prevent ground shaking from being transmitted to a building as much as possible when an earthquake occurs, and can also damp the shaking of the building.

<Means for Solving the Problems> In order to achieve the above object, a vibration damping device having a damper made of an elastoplastic material according to the present invention includes an isolator that supports a building on a foundation, and an elastic member that can connect the foundation and the building. A damper made of plastic material, an actuating device that connects or separates the foundation and the building from the damper, and an actuation device that connects or separates the foundation and the building from the damper, and receives the output from a seismometer on the ground so that the damper connects the foundation and the building when no earthquake is occurring. and a control device that controls the actuating device so that the damper moves away from the foundation or the building as necessary when an earthquake occurs.

<Operation> According to the above configuration, when an earthquake is not occurring, the elastoplastic damper connects the foundation and the building. Therefore, even if the building tries to sway due to strong winds, etc., the elastoplastic damper connects the foundation and the building, and the elastoplastic strain of this damper absorbs the energy of the swaying of the building, so the sway of the building can be reduced. .

On the other hand, when an earthquake occurs, the control device receives the output from the ground-side seismometer and controls the actuator to move the damper away from the foundation or building. Therefore, the building is connected to the foundation only by the isolator, which reduces the transmission of seismic energy from the foundation to the building and reduces the shaking of the building.

The above control device controls the damper as necessary during an earthquake, for example, when the predominant frequency of the earthquake matches the natural frequency of the building, or when the vibration of the building is larger than the vibration of the foundation. It is possible to reduce the shaking of a building by connecting the foundation and the building.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In Fig. 1, l is a foundation, 2 is a building, 3 is a laminated rubber as an isolator that supports the building 2 on the foundation 1, 5 is a socket provided at the bottom of the building 2, and 6 is a cutout as a damper made of elastoplastic material. A bullet-shaped lead plug; 8 is an air cylinder as an actuating device for pushing and pulling the lead plug 6 through a spring 7; 11 is a support fixed to the base l and having a guide hole 12 at the top for guiding the lead plug 6; It is a stand.

In addition, 15 is a seismometer that detects the shaking on the ground side, 16 is a seismometer that detects the shaking of the building 2, and 17 is a seismometer 15.16
This is a control device including a microcomputer that receives the output of the air cylinder 8 and controls the air cylinder 8 as shown in FIG.

The operation of the vibration damping device having the above configuration will be explained with reference to FIG.

The control device 17 controls the seismometer 15 on the ground side in step S1.
It is determined whether an earthquake has occurred based on the output of
Outputs a signal to the air cylinder 8 to push it into the socket 5. Therefore, when an earthquake is not occurring, the building 2 is mounted on the support base 11 by fitting the lead plug 6 and the socket 5.
is connected to the base l via. Therefore, even if the building 2 is subjected to strong winds, the shaking is damped by the lead plug 6, and the shaking of the building 2 is reduced.

On the other hand, when it is determined in step S1 that an earthquake has occurred f, the process proceeds to step S2, and the control device [7 outputs a signal to the air cylinder 8 to pull out the lead plug 6 from the socket 5. Therefore, when an earthquake occurs, the connection between the socket 5 and the plug 6 is disconnected as shown in FIG. This laminated rubber 3 has a deformation coefficient of 1 as shown in FIG. 5, and the lead plug 6 and the laminated rubber 3 shown in FIG.
The deformation coefficient of the composite product is 2. is smaller than 3, the transmission of seismic energy to the building 2 is extremely small, and the shaking of the building 2 can be reduced. In addition, the fourth
In the figure, K2 is a deformation coefficient when the lead plug 6 is elastically deformed, and K3 is a deformation coefficient when the lead plug 6 is plastically deformed.

Next, in step S3, it is determined whether the predominant frequency of the earthquake is different from the natural frequency of the building. If the predominant frequency of the earthquake matches the natural frequency of the building, the shaking of the building may become large even if a small earthquake energy is input, so proceed to step S6 and connect the lead plug 6 and socket 5. The building 2 is damaged due to the plastic strain of the lead plug 6.
apply a brake to the shaking. When it is determined in step S3 that the dominant frequency of the earthquake does not match the natural frequency of the building, the process proceeds to step S4, where the input from the seismometer 15 on the ground side and the input from the seismograph 16 installed in the building 2 are input. Based on this, the control device 17 determines whether the vibration of the building 2 is smaller than the vibration of the foundation l.

If the vibration of the building 2 is larger than the vibration of the foundation 1, the control device 17 proceeds to step S6, operates the air cylinder 8 to connect the lead plug 6 and the socket 5, and causes the lead plug 6 to undergo elastic-plastic deformation. This reduces the shaking of the building 2.

When it is determined in step S4 that the vibration of the building 2 is smaller than the vibration of the foundation l, the process proceeds to step S5, where it is determined whether the earthquake has ended based on the input from the seismometer 15 on the ground side, and the earthquake If the earthquake has ended, the process advances to step S6 and the lead plug 6 is inserted into the socket 5, and if the earthquake has not ended, the process returns to step S3.

In this way, when an earthquake is not occurring, or when an earthquake is occurring and the vibration of the building 2 is larger than the vibration of the foundation 1, or when the predominant frequency of the earthquake matches the natural frequency of the building 2, the lead plug 6 When connected to the socket 5, the energy of the shaking of the building 2 can be absorbed by the elastic-plastic deformation of the lead plug 6, thereby reducing the shaking of the building 2. On the other hand, in the event of an earthquake, the lead plug 6 and socket 5 are disconnected and the building 2 is built as a foundation using only the laminated rubber 3.
In conjunction with this, the input of seismic energy to the building 2 can be reduced and the shaking of the building 2 can be suppressed.

Although the laminated rubber 3 was used as the isolator in the above embodiment, a roller or a slide may be used instead of the laminated rubber 3. Further, although the air cylinder 8 is used as the actuating device, a hydraulic cylinder may be used or an electric drive mechanism may be used.

<Effects of the Invention> As is clear from the above, according to the present invention, a building is supported on a foundation by an isolator, an elastoplastic damper is actuated by an actuation device controlled by a control device, and this damper is used to prevent earthquakes. When an earthquake is not occurring, the foundation and building are connected, but when an earthquake occurs, the damper is moved away from the foundation or building as necessary, so when an earthquake occurs, the damper will not transfer seismic energy to the building. In addition, when an earthquake is not occurring or when necessary during an earthquake, the foundation and the building can be connected to reduce the vibration of the building in an elastoplastic manner. It can be damped by dampers made of wood.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a diagram showing a state in which the lead plug and socket are separated, Fig. 3 is a flowchart showing the operation of the control device, and Fig. 4 is a diagram showing the lead plug and socket. and FIG. 5 is a diagram showing the displacement load characteristics of the laminated rubber. ■...Foundation, 2...Building, 3...Laminated rubber, 5...
・・Socket, 6・Lead plug, 8・Air cylinder-1516・Seismometer. 7 - Control device. Patent applicant Okumura Gumi Co., Ltd. Agent

Claims (1)

[Claims] (1) An isolator that supports the building on the foundation, a damper made of elastoplastic material that can connect the foundation and the building, an actuation device that connects or separates the foundation and the building to the damper, and an earthquake on the ground side. When an earthquake does not occur, the damper connects the foundation and the building based on the output of the meter, and when an earthquake occurs, the damper moves away from the foundation or the building as necessary. A vibration damping device having a damper made of an elastoplastic material, comprising a control device for controlling the actuating device.