JP2000087589A - Active type earthquake damping system for multilayer structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system, in which a large earthquake-damping effect is displayed by the minimized earthquake-damping system while decreasing the number of an earthquake damper and a sensor, etc., in the active type earthquake damping system for a multilayer structure, in which the earthquake damping device is installed into the beam-column frame of the structure and quakes by an earthquake, etc., are reduced. SOLUTION: An active control type earthquake-damping device 2 is fitted only on the lower layer floor of a building structure in place of installation on each floor of the active control type earthquake-damping devices 2 and sensors 3. Stiffening braces 7 are set up into a beam-column frame and the rigidity of the beam-column frame is increased regarding upper layer floors excepting the lower layer floor. The quantity of response detected by the sensor 3 attached at the top section of the structure is fed back, the earthquake- damping device 2 installed on the lower layer floor is controlled, and the response of the building structure in an earthquake is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control system which is installed on a multi-layer structure to reduce shaking caused by an earthquake or the like. The present invention relates to an active vibration control system for a multi-layered structure, which exerts a great effect at a time.

[0002]

2. Description of the Related Art An active control type vibration damping device is installed in a column-column frame of a multi-layer structure via a seismic element such as a brace or an earthquake-resistant wall, and based on a response amount detected by a sensor installed in the structure. Various active vibration damping systems configured to suppress vibration of a structure by giving a control command to the vibration damping device have been developed.

In this type of a type in which a vibration control device is installed in a beam-column structure, as shown in FIG. 1 (b), the vibration control device is installed in a column-beam structure of each floor of a multi-layer structure via a seismic element. Generally, a sensor is provided on each floor to control the vibration control device for each floor.

That is, in the conventional vibration control system shown in FIG. 1 (b), a computer 4 minimizes the shaking during an earthquake based on information (signal line 5) from a sensor 3 installed on each floor. (Command line 6) for instructing the damping force to the vibration damping device 2 for control.

As such a vibration damping device 2, there is a vibration damping device in which an actuator or a damper is interposed between a beam-column frame and a seismic element such as a brace 1 or an earthquake-resistant wall. For example, Japanese Patent Publication No. 7-42811 and Japanese Patent Publication No. 7-4578.
No. 1 discloses a system using a hydraulic damper type variable damping device as such a vibration damping device.

[0006]

In the above-described vibration control system, a large vibration control effect can be obtained by installing the vibration control device 2 and the sensor 3 in each layer.
A large amount of cost is required for installing the system, such as the cost of the sensor 3 and the cost of installing wiring and the like in the building.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to reduce the number of vibration damping devices and sensors, to reduce the capacity of a computer, and to minimize the work of wiring in a building. The purpose is to provide a vibration control system that exerts a large vibration control effect with the improved vibration control system.

[0008]

According to a first aspect of the present invention, an active vibration control system for a multilayered structure according to the first aspect of the present invention includes a brace or an earthquake-resistant system in a column-beam frame of a structure, as shown in FIG. Install active control type vibration control devices through seismic elements such as walls,
In an active vibration control system configured to suppress vibration of a structure by giving a control command to the vibration control device based on a response amount detected by a sensor installed in the structure, an active control type vibration control device Is installed only on the lower floors of the building structure, and on the upper floors other than the lower floors, seismic elements such as braces or earthquake-resistant walls are installed in the column-beam frame to increase the rigidity of the column-beam frame, and The response amount detected by the installed sensor is fed back to give a command to the vibration control device installed on the lower floor.

That is, the number of vibration damping devices and sensors can be greatly reduced as compared with the case where each floor is installed.
To that extent, the cost of the equipment constituting the vibration damping system is reduced, the problem of the installation location is solved, and the labor for wiring work is reduced.

[0010] Further, in a configuration in which the vibration control device is installed only on the lower floor of the building structure, the upper floor where the vibration control device is installed in the conventional vibration control system other than the lower floor is not included in the normal structure. By increasing the rigidity of the beam-column frame itself with a brace, an earthquake-resistant wall, or the like, the reduction of the vibration-damping effect can be minimized.

The lower floor referred to here includes not only the first floor but also the floors installed on the second and third floors. In addition, when there is a basement floor, it includes the case where it is a part of the lower floor. Similarly, the upper floor where the seismic element is installed includes not only all floors except lower floors, but also cases where some floors are not reinforced.

According to a second aspect of the present invention, in the active vibration control system for a multi-layer structure according to the first aspect, a sensor is also installed on the intermediate floor, and in addition to the response amount detected by the sensor at the top of the structure, The response amount detected by the sensor is also fed back to give a command to the vibration damping device.

The intermediate floor referred to here is between the lower floor and the top of the structure, but is not necessarily limited to a specific floor, and includes a case where sensors are installed at a plurality of positions and floors of the intermediate floor. The vibration control system of the present invention is basically designed to reduce the number of vibration control devices and sensors so that the vibration control effect is not impaired. By feeding back together the response amount of, the number of sensors increases, but more efficient vibration suppression becomes possible.

According to a third aspect of the present invention, in the active damping system for a multilayer structure according to the first or second aspect, the case where the damping device is a hydraulic actuator such as a hydraulic or pneumatic actuator or an electromagnetic actuator is limited. is there. Claim 4 similarly limits the case where the vibration damping device is a variable damping device.

These vibration damping devices themselves may be those used in conventional vibration damping systems. Signals relating to response amounts from sensors are analyzed by a computer or sent to a control circuit to set control rules (control rules). Based on the rules, various control rules can be considered depending on the purpose.

According to a fifth aspect of the present invention, in the fourth aspect, the variable damping device is limited to a variable oil damper having a flow control valve provided in an oil passage connecting a cylinder, a piston, and hydraulic chambers on both sides of the piston. It is.

Examples of such a variable oil damper include, for example, Japanese Patent Publication No. 7-42811 and Japanese Patent Publication No. 7-42811.
There is one described in Japanese Patent No. 45781.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows an outline of an analysis model of a vibration control system for a multi-layered structure according to the present invention, and shows a case of a conventional vibration control system (each floor control) shown in FIG. 1B. This is shown in comparison, and it is assumed that a hydraulic actuator is used as the vibration control device 2.

The building used for the study is a 9-story steel building office building with a standard floor area of 800 m ² and a floor weight of 640 t. The primary natural period of only the frame (frame) is about 1 second.

An actuator as a vibration control device 2 is installed on the first floor via a brace 1, and the rigidity of the upper floor is increased by a stiffening brace 7. The sensors 3 are installed only on the upper and lower floors of the first floor and on the uppermost floor, and control by feeding back the absolute speed. The input ground motion was El Centro 19
The maximum acceleration of 40 NS was 100 Gal.

For comparison, a structure having only a rigid frame shown in FIG. 1 (c) (normal structure) and a case where no damping device is provided in the frame of the present invention shown in FIG. 1 (d) (no control) Also performed a response analysis in the same manner.

FIG. 2 shows the results of the response analysis. In the vibration control system (bold line a) of the present invention, the acceleration is greatly reduced in all layers and the interlayer deformation is smaller than in the normal structure (dotted line c). And the shear force is greatly reduced except at the first floor.

In addition, when compared with the conventional vibration control system of each floor control (solid line b), the acceleration and the shearing force have almost the same response values except the shearing force of the first floor, and the interlayer deformation is the first floor. In other cases, it is reduced to about 1/2. From this comparison, in the present invention, the same effect can be obtained with the smallest system as compared with the case where the vibration control device is installed in each layer, and the interlayer deformation which is an index for measuring the damage of the building can be further reduced.

In addition, when compared with the case of no control (broken line d), the first floor portion has the same response value, but in other cases, acceleration, interlayer deformation and shear force are greatly reduced.

FIG. 3 schematically shows a basic structure of a variable oil damper as an example of the vibration damping device 2 according to the present invention. A piston 12 reciprocates in a cylinder 11 and hydraulic chambers on both sides of the piston 12 are provided. Oil path 14 connecting 13
Is provided with a flow control valve 15.

Cylinder 11 and piston rod 12a
Is connected to, for example, a beam of a beam-column frame, and the other is connected to a seismic element such as a brace. When an interlayer displacement occurs in a structure due to an external vibration force such as an earthquake, the variable oil damper exhibits a damping resistance. By adjusting the opening of the flow control valve, the damping resistance is used as a control force. It can act on the frame.

[0027]

According to the vibration control system for a multi-layered structure of the present invention, the number of vibration control devices and sensors can be reduced, the capacity of a computer can be reduced, and the wiring work in a building can be saved and minimized. A large damping effect can be obtained with the damped vibration control system.

In particular, it is possible to efficiently reduce the interlayer deformation which has a great influence on determining the degree of damage to the building. In addition, by making the structure of the upper floor a brace structure, rigidity and proof stress can be efficiently ensured.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an analysis model of a multi-layer structure vibration control system of the present invention and a comparative example, wherein (a) is the case of the present invention, (b) is the case of each conventional floor control, (c) ) Is the case of the normal structure without the vibration damping device, and (d) is the case where the control as the vibration damping system is not performed in the frame of the present invention.

FIG. 2 is a graph showing a response analysis result using the analysis model of FIG. 1;

FIG. 3 is a diagram schematically showing a basic structure of a variable oil damper as an example of a vibration damping device used in the present invention.

[Explanation of symbols]

a: the vibration control system of the present invention, b: conventional vibration control system, c: normal structure, d: when the structure corresponding to the vibration control system of the present invention is uncontrolled, 1 ... brace, 2 ... vibration control device 3, sensor, 4 computer, 5 signal line, 6
... Command line, 7 ... Stiffening brace, 11 ... Cylinder, 12 ...
Piston, 12a: piston rod, 13: hydraulic chamber, 1
4: Oil passage, 15: Flow control valve

Claims (5)

[Claims] 1. An active control type vibration damping device is installed in a column-beam frame of a structure via a seismic element such as a brace or an earthquake-resistant wall, and the vibration control device based on a response amount detected by a sensor installed in the structure. In an active vibration control system configured to suppress the vibration of a structure by giving a control command to the vibration control device, the active control type vibration control device is installed only on the lower floor of the building structure, and other than the lower floor For the upper floors, a seismic element such as a brace or an earthquake-resistant wall is provided in the beam-column frame to increase the rigidity of the beam-column frame, and the response amount detected by the sensor installed on the top of the structure is fed back to the lower beam column. An active vibration control system for a multi-layered structure, wherein a command is given to a vibration control device installed on a floor. 2. The active control system for a multi-layer structure according to claim 1, wherein a sensor is installed on the middle floor in addition to the top of the structure, and a command is given to the vibration control device by feedback of the response amount. Quake system. 3. The active vibration control system for a multilayer structure according to claim 1, wherein the active control type vibration control device is a fluid pressure actuator or an electromagnetic actuator. 4. The active vibration control system for a multilayer structure according to claim 1, wherein the active control type vibration control device is a variable damping device. 5. The active damping device for a multilayer structure according to claim 4, wherein the variable damping device is a variable oil damper provided with a flow control valve provided in an oil passage connecting a cylinder, a piston, and hydraulic chambers on both sides of the piston. system.