JP2585446B2 - Vibration damper with elasto-plastic damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a vibration damping device having a damper made of an elasto-plastic material for reducing the shaking of a building during an earthquake.

<Conventional technology> Conventionally, this type of vibration damping device has a semicircular steel rod that constantly connects the foundation and the building, and absorbs the energy of the building shaking due to the elasto-plastic deformation of the steel rod during an earthquake. do it,
Some are designed to prevent the building from shaking.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional vibration damping device, since the building and the foundation are always connected by the steel bar, the shaking on the ground at the time of the earthquake is transmitted to the building through the steel bar. Therefore, there is a problem that the shaking of the building is increased in the early stage of the earthquake.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration damping device that can minimize the shaking of the ground at the time of the occurrence of an earthquake to a building and can apply a brake to 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 elasto-plastic material according to the present invention includes an isolator for supporting a building on a foundation and a spring capable of connecting the foundation and the building. A damper made of a plastic material, an actuating device for connecting or separating the foundation and the building with the damper, and a first device for detecting ground shaking.
A seismometer, a second seismometer for detecting the shaking of the building, and an output of the first and second seismometers, when no earthquake occurs, and when the earthquake occurs, the base or building If the swing of the building becomes a specific swing, the damper connects the foundation and the building, while if an earthquake occurs and the swing of the foundation or building is not the specific swing, And a control device for controlling the operating device so that the damper separates the foundation from the building.

<Operation> According to the above configuration, when no earthquake occurs,
An elasto-plastic damper connects the foundation and the building. Therefore, even if the building tries to shake due to strong winds, etc., the sway of the building can be reduced because the elasto-plastic damper connects the foundation and the building and absorbs the energy of the sway of the building by the elasto-plastic distortion of the damper .

On the other hand, when it is determined by the control device that an earthquake has occurred based on the outputs of the first seismometer on the foundation side and the second seismometer on the building side, the operation device is controlled by the control device, and the damper is mounted on the foundation. Or separated from the building. For this reason, the building is connected to the foundation only by the isolator, so that the transfer of seismic energy from the foundation to the building is reduced, and the shaking of the building is reduced.

Further, the control device makes the foundation or the building shake in a specific manner during the occurrence of the 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 reduced). When it is determined that the vibration is larger than the vibration of the foundation, the foundation and the building are connected by the damper in order to reduce the shaking of the building.

<Example> Hereinafter, the present invention will be described in detail with reference to an illustrated example.

In FIG. 1, 1 is a foundation, 2 is a building, 3 is a laminated rubber as an isolator for supporting the building 2 on the foundation 1, 5 is a socket provided at the bottom of the building 2, and 6 is a cut as an elastic-plastic damper. A head plug type lead plug, 8 is an air cylinder as an actuator for pushing and pulling the lead plug 6 through a spring 7, 11 is fixed to the base 1, and has a guide hole 12 at an upper portion for guiding the lead plug 6. It is a stand.

Reference numeral 15 denotes a seismometer for detecting shaking on the ground side, reference numeral 16 denotes a seismometer for detecting shaking of the building 2, and reference numeral 17 denotes an output of the seismometers 15 and 16 to control the air cylinder 8 as shown in FIG. It is a control device including a microcomputer to perform.

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

The controller 17 receives the output of the ground-side seismometer 15 in step S1 to determine whether or not an earthquake has occurred. If no earthquake has occurred, the process proceeds to step S6, in which the lead plug 6 is connected to the socket 5. The push signal is output to the air cylinder 8.
Therefore, when no earthquake occurs, the building 2 is connected to the foundation 1 via the support base 11 by fitting the lead plug 6 and the socket 5. Therefore, even if the building 2 receives a strong wind or the like, the swing thereof is braked by the lead plug 6, and the swing of the building 2 is reduced.

On the other hand, when it is determined in step S1 that an earthquake has occurred, the process proceeds to step S2, where the control device 17 outputs a signal to the air cylinder 8 to pull out the lead plug 6 from the socket 5. Therefore, when an earthquake occurs, socket 5 and plug 6
As shown in FIG. 2, the connection between the ground and the foundation 1 is transmitted to the building 2 only through the laminated rubber 3. This laminated rubber 3 has a deformation coefficient as shown in FIG.
It has a K1 and is smaller than the deformation coefficients K2 and K3 of the composite of the lead plug 6 and the laminated rubber 3 shown in FIG. 5, so that the transmission of seismic energy to the building 2 is extremely small and the shaking of the building 2 is small. can do. In FIG. 4, K2 is a deformation coefficient when the lead plug 6 undergoes elastic deformation.
K3 is a deformation coefficient when the lead plug 6 undergoes plastic deformation.
Next, in step S3, it is determined whether or not the dominant 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 increase even with a small input of seismic energy.
Are connected, and the vibration of the building 2 is damped by the plastic strain of the lead plug 6. If 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 ground-side seismometer 15 and the input from the seismometer 16 provided in the building 2 Control signal 17 based on
Determines whether the vibration of the building 2 is smaller than the vibration of the foundation 1. If the vibration of the building 2 is larger than the vibration of the foundation 1, the process proceeds to step S6, where the control device 17 operates the air cylinder 8 to connect the lead plug 6 and the socket 5, and the elasto-plastic deformation of the lead plug 6 Thereby, the shaking of the building 2 is reduced. When it is determined in step S4 that the vibration of the building 2 is smaller than the vibration of the foundation 1, the process proceeds to step S5, where it is determined whether or not the earthquake has ended based on the input from the seismometer 15 on the ground side. If the earthquake has ended, the process proceeds to step S6, where the lead plug 6 is pushed into the socket 5, and if the earthquake has not ended, the process returns to step S3.

When the earthquake does not occur, or when the vibration of the building 2 is larger than the vibration of the foundation 1 during the occurrence of the earthquake, or when the dominant frequency of the earthquake matches the natural frequency of the building 2, the lead plug 6 is used. By connecting the socket 5 and the lead plug 6 by the elasto-plastic deformation, the energy of the sway of the building 2 can be absorbed and the sway of the building 2 can be reduced.
On the other hand, when an earthquake occurs, the connection between the lead plug 6 and the socket 5 is disconnected, and the building 2 is connected to the foundation 1 only by the laminated rubber 3, thereby reducing the input of seismic energy into the building 2. The shaking can be suppressed.

Although the laminated rubber 3 is 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 actuator, 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, the building is supported on the foundation by the isolator, and the control device is controlled based on the outputs of the first seismometer on the foundation side and the second seismometer on the building side. Actuating an elasto-plastic damper by means of an actuating device controlled by an earthquake, if no earthquake has occurred, and
When an earthquake occurs and the foundation or building shakes in a specific manner, the damper connects the foundation and the building while the earthquake occurs and the foundation or building swings in a specific manner. Otherwise, the damper separates the foundation and the building, so when an earthquake occurs, the input of seismic energy to the building can be reduced to reduce the shaking of the building . Also, when an earthquake has not occurred, and when an earthquake has occurred and the foundation or the building has shaken in a specific manner,
The foundation and the building are connected with the above damper, and the vibration of the building can be reduced by damping with the elastic-plastic damper.

[Brief description of the drawings]

FIG. 1 is a schematic view of one embodiment of the present invention, FIG. 2 is a view showing a state in which a lead plug and a socket are separated, FIG. 3 is a flowchart showing the operation of a control device, and FIG. And FIG. 5 is a diagram showing the displacement load characteristics of the laminated rubber, and FIG. 5 is a diagram showing the displacement load characteristics of the laminated rubber. 1 ... foundation, 2 ... building, 3 ... laminated rubber, 5 ... socket, 6 ... lead plug, 8 ... air cylinder, 15, 16 ... seismometer, 17 ... control device.

Claims (1)

(57) [Claims] An isolator for supporting a building on a foundation; a damper made of an elasto-plastic material capable of connecting the foundation and the building; an operating device for connecting or separating the foundation and the building to the damper; A first seismometer that detects shaking, a second seismometer that detects shaking of the building, and an output of the first and second seismometers when no earthquake has occurred and an earthquake has occurred When the foundation or building swings in a specific manner, the damper connects the foundation and the building while the earthquake occurs and the foundation or building swings in the specific manner. And a control device for controlling the operating device so that the damper separates the foundation and the building.