JPH0747898B2 - Variable rigidity device for building frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable-rigidity structure for a building frame, and changes the rigidity of the building frame in response to an external force such as an earthquake or wind that is input to a building having a seismic control structure to cope with the earthquake. It is a thing.

[0002]

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

As a method of earthquake resistance, a seismic isolation construction method or a seismic reduction construction method in which laminated rubber bearings and dampers are interposed between the building and the foundation, and a method of consuming earthquake energy by breaking non-major members of building components, There is a method of providing a slit in a wall or a pillar to adjust a building to an optimum rigidity.

By the way, when confirming the safety of a building designed by the existing seismic design method during an earthquake, it is said that the absorbed energy due to the hysteresis characteristic accompanied by plasticization of the structure exceeds the earthquake energy acting on the structure. According to the basic idea, this has a problem of reliability for the history loop characteristic.

All of the conventional methods provide a passive seismic resistant structure against natural external forces such as earthquakes and winds.
Since the building has a specific natural frequency, it is impossible to avoid the resonance phenomenon for an uncertain input such as an earthquake.

On the other hand, the applicant of the present invention is Japanese Patent Laid-Open No. 62-268.
In Japanese Patent No. 479, the rigidity of the building itself is changed based on the judgment of the response prediction system based on the sensed seismic motion, not in the passive seismic resistance method as described above, to make it outside the resonance region or in a state where there is little resonance, Also, a seismic control method for ensuring the safety of equipment and residents in the building is disclosed.

In the above-mentioned vibration control method, columns, beams, braces,
A control device whose connection state is changed by a computer command is installed between all or part of walls and their joints, or between a building and a foundation or an adjacent building, and the building is seismic controlled as follows. .

The occurrence of an earthquake is detected by an earthquake detection device arranged in a narrow area and a wide area around a building, and the observation data is transmitted to a computer by a wired or wireless communication network. The wide area seismic detector is connected to the seismograph at the existing seismic observation point or a specially installed seismometer by a micro line or a telephone line. The narrow-area seismic sensing device is composed of a seismograph installed around the building or in the surrounding ground, and a vibration sensor installed in the building base or inside the building. The influence of wind force is detected by the vibration sensor inside the building.

Regarding the detected earthquake, the computer determines the magnitude of the earthquake, analyzes the frequency characteristics, predicts the response amount, etc., and determines whether or not the building vibration should be controlled, and the control amount when it should be controlled. To determine the optimum stiffness (natural frequency) with less seismic response.

A command from the computer is transmitted to the control device of each part of the building, and the control device is operated so that the rigidity of the building becomes the optimum rigidity based on the prediction of the computer.

The connection state is adjusted by turning on and off the fixed state and the release state by a hydraulic mechanism, an electromagnet, etc., or outside the fixed state and the release state, introducing a tension force and fixing at any position. A hydraulic mechanism or a special alloy may be used for adjustment.

Further, the vibration sensor arranged in the building can detect the response amount in each part of the building and the actual vibration when the control is performed, and by feeding back this, the control amount can be corrected.

[0013]

In the active vibration control method as described above, not only is the rigidity of the building frame variable, but its control can be performed accurately and even against large vibration external force, The coupling mechanism must be fully functional without damage. In addition, if the connecting mechanism and other devices become large-scale, problems such as installation space will occur.

The present invention addresses the above-mentioned problems, and can be installed in a column-beam structure, and can be easily used when the joint state between a wall and a beam or a column is changed to change the rigidity of a frame. It is an object of the present invention to provide a variable-rigidity device that can effectively control with various mechanisms and is easy to control.

Another object of the present invention is to effectively reduce the response of a building by an actively controlled variable stiffness device, prevent seismic damage to the building, and at the same time, to protect the people and machines living inside. The purpose is to protect equipment and the like from discomfort and vibration damage caused by an earthquake.

[0016]

The outline of the present invention will be described below with reference to the reference numerals in the drawings corresponding to the embodiments.

In the variable rigidity structure of the building frame of the present invention, a hydraulic braking device 5 is provided as a hydraulically controllable connecting device between a wall 3 provided in the frame and a column 1 or a beam 2 constituting the frame. By interposing, the joining force of the hydraulic braking device 5 is hydraulically controlled to adjust the contribution of the seismic wall 3 to the rigidity of the frame, and the rigidity of the frame is made variable.

The wall 3 is erected from the lower beam 2 or floor slab, or hung from the upper beam 2,
The structure is not directly affected by the deformation of the frame, and the joining state by the hydraulic braking device 5 is controlled.

The hydraulic brake device 5 is, for example, a disc brake-like brake device, is provided on the pillar 1 or the beam 2 on the frame side, sandwiches the wall 3 from both sides, and joins the wall 3 by the frictional resistance force on the contact surface. is doing. That is, by increasing the hydraulic pressure and increasing the force for sandwiching the wall 3 of the hydraulic braking device 5, the frictional resistance force on the surface of the wall 3 increases, and the contribution of the wall 3 to the rigidity of the frame increases. On the contrary, by lowering the hydraulic pressure, the frictional resistance becomes smaller and the contribution of the wall 3 to the rigidity of the frame decreases. Therefore, the rigidity of the frame can be controlled by controlling the hydraulic pump 6 for sending the hydraulic pressure to the hydraulic braking device 5, the valve 8 provided on the transmission pipe 7 thereof, and the like.

[0020]

Embodiments Next, the illustrated embodiments will be described.

1 and 2 show a first embodiment of the present invention.

In this embodiment, a reinforced concrete wall 3 is raised from a lower beam 2 of a column-beam construction surface surrounded by left and right columns 1 and upper and lower beams 2 separately from the columns 1 and the upper beam 2. The upper beam 2 and the wall 3 can be joined by a hydraulic braking device 5 as a connecting device. More specifically, a hanging part 4 is formed on the upper beam 2 so as to sandwich the upper end of the wall 3 from both sides, and a hydraulic braking device 5 is interposed between the hanging part 4 and the upper end of the wall 3.

By applying hydraulic pressure from the hydraulic pump 6 through the hydraulic transmission pipe 7, the hydraulic braking device 5 can sandwich the upper end portion of the wall 3 and adjust the effectiveness of the wall 3. That is, in the off state, the wall 3 is in a free state with respect to the upper beam 2 and the left and right pillars 1, does not bear a horizontal force during an earthquake, and has a low rigidity as a frame. In the ON state in which hydraulic pressure is applied by the hydraulic pump 6, the hydraulic braking device 5
Sandwiches the upper end of the wall 3 from both sides of the wall 3 and increases the hydraulic pressure to increase the rigidity of the frame. Further, in this embodiment, the wall 3 is sandwiched by four pairs of hydraulic braking devices 5, but the hydraulic transmission pipes 7 leading to the hydraulic braking devices 5 are provided.
The valve 8 is provided in the valve, and the rigidity of the frame can be changed by opening and closing the valve 8.

FIG. 3 shows a second embodiment of the present invention.

The point that the effectiveness of the wall 3 is controlled by the hydraulic braking device 18 is the same as in the first embodiment, but in this embodiment, a hydraulic pressure sensing device is provided between the upper end of the side of the wall 3 and the pillar 1. A dual-purpose cylinder 19 is installed, and transmission of hydraulic pressure to the hydraulic braking device 18 and the cylinder 19 by the common hydraulic pump 17 is performed.
The switching is made by operating the valves 20a and 20b.

In this case, depending on the switching of the open / closed states of the valves 20a and 20b and the driving state of the hydraulic pump 17, the following three ways of use are possible.

When the valve 20a is opened, the valve 20b is closed, and the drive of the hydraulic pump 17 is actively controlled in accordance with the vibration external force such as an earthquake or the response of the building, the hydraulic braking device 18 is the case of the first embodiment. The cylinder 19 functions as a damper at this time.

If the valve 20a is closed, the valve 20b is opened, and the hydraulic pump 17 is stopped, only the cylinder 19 can function as a damper.

When both the valves 20a and 20b are opened and the hydraulic pump 17 is stopped (the piston is fixed), a hydraulic pressure is generated in the cylinder 19 according to the relative displacement between the beam frame and the wall 3, and the hydraulic pressure is transmitted to the hydraulic transmission pipe. Hydraulic braking device 18 through 7
To increase the frictional resistance force, that is, the braking force, on the contact surface with the wall 3, and passive type vibration control is performed.

With respect to the above, there is an advantage that even if the supply of hydraulic pressure from the outside becomes impossible due to a power failure or the like, it can function as a fail-safe mechanism.

[0031]

EFFECTS OF THE INVENTION By controlling a hydraulic braking device provided between a wall and a beam or a column, the wall can be made effective or ineffective as an earthquake-resistant wall, and the building frame can be freely deformed. Can be controlled.

Since the wall surface is used as the friction force acting surface, a large friction force can be obtained. Further, since the same pressure can be applied to the whole, there is no biased stress concentration in the wall surface, and a well-balanced joint structure can be obtained.

Since the present invention uses the hydraulic braking device that sandwiches the wall from both sides, not only the horizontal shear deformation but also the vertical deformation (the higher the tower ratio, the higher the bending deformation ratio). (High), it can function in the same way as in the horizontal direction, and a greater damping effect can be obtained. Further, there is no need for a clearance (play) for vertical deformation, which is required in a connecting device using a hydraulic cylinder or the like.

By controlling the driving of the hydraulic pump, the opening and closing of valves, and the like by a computer or the like, and by controlling the joining state by the connecting device, the deformation of the entire building can be controlled according to the individual seismic characteristics. This enhances the safety of the building and creates a comfortable living space with less shaking.

[Brief description of drawings]

FIG. 1 is a front view of a frame showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view corresponding to FIG.

FIG. 3 is a front view of a frame showing a second embodiment of the present invention.

[Explanation of symbols]

1 ... Pillar, 2 ... Beam, 3 ... Wall, 4 ... Hanging part, 5 ... Hydraulic braking device, 6 ... Hydraulic pump, 7 ... Hydraulic transmission pipe, 8 ... Valve, 17 ...
Hydraulic pump, 18 ... Hydraulic braking device, 19 ... Cylinder,
20a, 20b ... Valve

Claims (2)

[Claims] 1. A hydraulically controllable coupling device is interposed between a column or a beam constituting a frame and a wall provided in the frame of the frame, and a joining force by the coupling device is hydraulically controlled, A variable rigidity device of a building frame configured to adjust the contribution of the wall to the rigidity of the frame, wherein the connecting device is provided on the frame side, and the wall is sandwiched from both sides of the wall, A variable rigidity device for a building frame, which is a hydraulic braking device that joins the walls by frictional resistance. 2. The wall is raised from a lower beam or floor slab, and the hydraulic braking device is provided so as to sandwich an upper end portion of the wall from an upper beam or column.
Variable rigidity device for the building frame described.