JPH0413515B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a variable rigidity device for a building frame, which changes the rigidity of the building frame in response to external forces such as earthquakes and wind that are input to a building with a damping structure. The purpose is to enable people to deal with earthquakes, etc.

[Conventional technology]

Conventionally, in the seismic design of high-rise buildings and important structures, dynamic design has been performed to check safety by calculating the ground movement and building response during an earthquake.

Earthquake resistance methods include seismic isolation or attenuation construction methods in which laminated rubber bearings or dampers are interposed between the building and the foundation, methods that consume earthquake energy by destroying non-main building components, walls or columns. There is a method to adjust the rigidity of the building to the optimum level by creating slits in the building.

By the way, confirmation of the safety of buildings designed using current seismic design methods in the event of an earthquake is based on the basic idea that the energy absorbed by the hysteresis characteristics associated with plasticization of the structure exceeds the seismic energy acting on the structure. However, this has the problem of reliability regarding the history loop characteristics.

In addition, all conventional methods provide a passive seismic structure against natural external forces such as earthquakes and wind, and because buildings have a specific natural frequency, they do not allow resonance phenomena to occur against uncertain inputs such as earthquakes. You can't avoid it.

In contrast, in Japanese Patent Application No. 61-112026 (Japanese Unexamined Patent Publication No. 62-268479), the applicant proposed a method based on the judgment of a response prediction system based on the detected seismic motion, rather than the passive seismic method described above. We are proposing a vibration damping method that changes the rigidity of the building itself to bring it out of the resonance region or into a state with less resonance, thereby ensuring the safety of the building, its equipment, residents, etc.

In the above seismic control method, a control device is installed in all or part of columns, beams, braces, walls, and their joints, or between a building and the foundation or an adjacent building, so that the connection state can be changed according to computer commands. , Damping the building is done as follows.

The occurrence of an earthquake is detected by earthquake sensing devices placed in both narrow and wide areas around buildings, and the observation data is transmitted to a computer via wired and wireless communication networks. Wide-area earthquake sensing equipment connects seismometers at existing earthquake observation points or specially installed equipment using micro-wires or telephone lines. In addition, narrow-area earthquake sensing devices consist of seismometers installed around buildings or in the surrounding ground, and vibration sensors installed at the base of buildings or inside buildings, and the effects of wind force etc. are detected by vibration sensors inside buildings.

For detected earthquakes, a computer determines the scale of the earthquake, analyzes frequency characteristics, predicts the amount of response, etc., and determines whether or not to control the vibration of the building, and if so, the amount of control to avoid resonance. The judgment is made based on the one that provides the optimum stiffness (natural frequency) with a small amount of seismic response.

The commands from the computer are transmitted to the control devices in each part of the building, and the control devices are operated so that the stiffness of the building reaches the optimal stiffness based on the computer's predictions. The connection state can be adjusted by turning the fixed state and uncoupled state on and off using hydraulic mechanisms, electromagnets, etc., and in addition to the fixed state and disconnected state,
It is conceivable to use a hydraulic mechanism or a special alloy to adjust the introduction of tension force and fixation at an arbitrary position.

In addition, vibration sensors placed inside the building will
The amount of response in each part of the building as well as the actual vibration when controlled can be detected, and this can be fed back to correct the amount of control.

[Purpose of the invention]

The variable stiffness device for a building frame of the present invention is used in the above-mentioned vibration control method in a column-beam structure, a floor slab structure, etc., and controls the deformation of the structure during an earthquake, thereby improving the response of the building. The purpose is to reduce earthquake damage and prevent earthquake disasters in buildings, as well as protect people and machinery and equipment living inside from discomfort caused by earthquakes, vibration disturbances, etc.

[Structure of the Invention] Hereinafter, an overview of the present invention will be explained using reference numerals in the drawings corresponding to the embodiments.

In the variable rigidity device of the present invention, a brace 3 consisting of two brace members 4 and 5 connected so as to be extendable and contractible in the longitudinal direction is disposed within the structural surface of a building frame, and the joint portion 6 of the brace 3 is connected to an oil-sealed fluid. pressure cylinder 14
It is composed of.

The fluid pressure cylinder 14 is provided with a control valve 17 for adjusting the flow of a sealed fluid 18 in a flow path 20 that communicates both sides of a piston 15, and the flow of the fluid 18 depends on the opening degree of the control valve 17. Adjusted by That is, when the control valve 17 is completely open, the piston 15 is free to move, and when the control valve 17 is closed, the piston 15 is substantially fixed.

This hydraulic cylinder 14 is formed at the end of one brace component 4, the rod 16 is fixed at the end of the other brace component 5, and the control valve 17 can be adjusted between a connected state and a disconnected state. It is possible to make a switch and make the brace 3 work or not. That is, the rigidity of the frame can be freely changed between a state of high rigidity, ie, a large natural frequency, and a state of low rigidity, ie, a small natural frequency, depending on the seismic characteristics.

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 1 shows an outline of the case where the variable rigidity device of the present invention is applied within a column-beam structure, and FIG. 2 shows the structure of a joint portion 6 of a brace 3 in an embodiment of the present invention.

The brace 3 is made by connecting two brace members 4 and 5 so as to be expandable and contractible in the longitudinal direction.
In the structural plane surrounded by the beam 2 and the beam 2, both ends are attached between diagonally positioned gusset plates 7, so that the connection state at the central joint 6 can be adjusted.

At the joint part 6, one brace component 4
As shown in the figure, an oil-sealed hydraulic cylinder 14 having a piston 15 is formed at the end thereof, and a piston rod 16 is fixed to the end of the other brace component 5 with a nut 19. In the figure, 17 is a control valve provided in a flow path 20 that communicates both sides of the piston 15 of the fluid pressure cylinder 14. By controlling the flow of the enclosed fluid 18 by the opening degree of this control valve 17, both braces can be connected. The components 4, 5 can be connected or separated. However, the disconnected state is not a completely disconnected state, but a fitted state with elasticity due to the volume of the fluid 18. The control valve 17 can be controlled by an electrical method or the like, and by controlling it by a computer, it is possible to immediately provide the frame with an optimal rigidity state depending on the seismic characteristics.

Although FIG. 1 shows the case where there is only one brace 3 in the composition plane, as shown in FIGS. 3 and 4,
It can also be applied to a plurality of braces 3 installed.

Moreover, although the above explanation has been made in relation to the structural surface surrounded by a pair of columns 1 and beams 2, when applied to a multi-story building, it is possible to arrange a large number of this device and change the rigidity of the building as a whole. You can also do it.

[Effects of the Invention] The joints between the brace components are constructed with oil-sealed fluid pressure cylinders, and the connection state can be changed by adjusting the control valve, so it is possible to change the rigidity of the building with a small amount of drive energy. can.

The rigidity of the frame can be freely controlled by controlling the connection state at the joint portion of the brace, which is made up of two brace constituent members, using a control device.

The deformation of the entire building can be controlled according to individual seismic characteristics by using commands from the control computer from the control device. This increases the safety of the building and creates a comfortable living space with less shaking.

[Brief explanation of drawings]

Fig. 1 is a front view of the frame showing an overview of the present invention, Fig. 2 is a sectional view in the longitudinal direction of the brace showing details of the joint part of the brace, and Figs. 3 and 4 are examples of arrangement of the brace within the structure. FIG. 1...Column, 2...Beam, 3...Brace, 4,5
... Brace component, 6 ... Joint part, 7 ... Gusset plate, 14 ... Cylinder, 15 ...
Piston, 16...Rod, 17...Valve, 18...
...Fluid, 19...nut, 20...channel.

Claims (1)

[Claims] 1 Variability of a building frame, in which a brace consisting of two brace members connected so as to be extendable and contractable in the longitudinal direction is arranged within the structural surface of the building frame, and a control device controls the state of connection at the joint of the brace. In the rigid device, an oil-sealed hydraulic cylinder having a piston is formed at one end of the brace component, a rod of the piston is fixed to an end of the other brace component, and the hydraulic cylinder is A variable rigidity device for a building frame, characterized in that a control valve for adjusting the flow of fluid in the flow path is provided in a flow path that communicates both sides of the piston.