JPH0559230B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a variable rigidity structure 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 absorbed energy exceeds the seismic energy acting on the structure due to the hysteresis characteristics associated with plasticization of the structure. This has the problem of reliability with respect to history loop characteristics.

In addition, all conventional methods provide a passive seismic structure against natural external forces such as earthquakes and wind, and are designed to provide a passive earthquake-resistant structure against natural external forces such as earthquakes and wind. You cannot avoid it.

On the other hand, in Japanese Patent Application Laid-open No. 62-268479, the applicant proposed that the rigidity of the building itself be changed based on the judgment of a response prediction system based on the detected seismic motion, instead of using the passive seismic resistance method described above. We are proposing a vibration damping method that ensures the safety of buildings, equipment, occupants, etc. inside the building by setting it outside the area or in a state with little resonance.

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

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 its frequency characteristics, predicts the amount of response, etc., and determines whether or not building vibration should be controlled, 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 the disconnected state on and off using hydraulic mechanisms, electromagnets, etc., and in addition to the fixed state and the 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 rigidity structure of the building frame of this invention is used in the above-mentioned seismic control method within the column and beam structure, and the shear walls or braces are controlled by a computer or the like,
By changing the rigidity of the frame by using it as an earthquake-resistant element or not,
The purpose is to reduce the response of buildings and prevent earthquake disasters in buildings, as well as to protect the people living inside and machinery and equipment from discomfort and vibration disturbances caused by earthquakes.

[Structure of the invention]

An outline of the present invention will be explained below using reference numerals in the drawings corresponding to the embodiments (see FIG. 1).

The variable-rigidity structure of the building frame of the present invention is arranged between a frame composed of left and right columns and upper and lower beams, and a brace or wall installed within the structural surface of this frame. A variable stiffness device equipped with a compression coil spring that can be changed depending on force, and a drive device consisting of a hydraulic cylinder that can automatically control this variable stiffness device are installed, and the elastic force of the coil spring is controlled by the drive device. The degree of contribution of the brace or wall to the rigidity of the frame can be varied by controlling the connection between the brace or wall and the frame to a stress transmission state or a free state. .

〔Example〕

Hereinafter, an embodiment illustrating a variable rigidity structure according to the present invention will be explained (see FIGS. 2 to 5).

Braces 3, 3 are installed along a 45° direction within a column-beam structure composed of left and right columns 1, 1 and upper and lower beams 2, 2 (see Fig. 2).

A variable control device 4,
4 is attached, and drive devices 5, 5 are installed at the other end.

The brace 3, the variable control device 4, and the drive device 5 are connected by a turnbuckle 6.

Further, the variable control device 4 and the drive device 5 are connected to the corner portion of the column 1 and the beam 2 via gusset plates 7, 7, so that the braces 3, 3 are in a state of intersecting within the column and beam structural plane. is set up.

The variable control devices 4, 4 are composed of a hydraulic cylinder 8, a cylinder receiver 9, and a compression coil spring 10 (see FIG. 3).

The cylinder receiver 9 is connected to the gusset plates 7, 7
It is attached by mounting screws 11, 11.

The hydraulic cylinder 8 is long in the longitudinal direction of the brace 3, has a compression coil spring 10 built therein, and has a rod 12 inserted in its center.

The tip of the rod 12 is connected by a brace 3 and a turnbuckle 6.

One end of the compression coil spring 10 is fixed to the hydraulic cylinder 8, and the other end is fixed to the rod 12.

When a tensile force is applied to the brace 3, the compression coil spring 10 is compressed, and the tensile force of the brace 3 is transmitted to the column/beam frame by its elastic force.

The variable control device 4 having such a configuration is rotatably attached to the flanges 9a, 9a of the cylinder receiver 9 by connecting pins 14.

The drive devices 5, 5 are hydraulic cylinders 8 in which a piston rod 13 is moved back and forth by the action of hydraulic pressure (see FIG. 5).

The piston rod 13 of the hydraulic cylinder 8 and the other end of the brace 3 are connected by a turnbuckle 6.

A solenoid valve or a servo valve is connected to the drive device 5, that is, the hydraulic cylinder 8, and by controlling the opening and closing of this valve by a computer, the drive device 5, that is, the piston rod 13 can be operated. .

The drive device 5 having such a configuration is connected to the drive device receiver 15 by the mounting screw 11, and the drive device receiver 1
5 is a connecting pin 16 to the gusset plates 7, 7,
16 (see Figure 3).

In such a configuration, when the piston rod 13 of the drive device 5 is moved toward the brace 3 (this state
Set to ON. ), the brace 3 becomes free with respect to the columns and beams, and no tensile force acts on the brace 3 (see Fig. 7). Therefore, the rigidity of the frame is reduced.

On the other hand, when the piston rod 13 is moved in the opposite direction, the compression coil valve 1 of the variable control device 4
0 is compressed, allowing stress to be transmitted between the brace 3 and the column/beam frame (see Figure 6). Therefore, the rigidity of the frame is increased.

FIGS. 8 and 9 show an example in which the drive device 5 is installed between the frame and the wall. , 10th
The figure and FIG. 11 show the principle of variable stiffness at that time.

[Effect of the invention] By controlling the drive device installed between the brace or wall and the beam or column using hydraulic pressure or the like, the brace or wall can be made to work as an earthquake-resistant element,
It can be turned on or off, and the rigidity of the building frame can be controlled freely.

By controlling the drive of hydraulic pumps, opening and closing of valves, etc. using a computer, etc., and controlling the connection state by the drive device, it is possible to control the deformation of the entire building according to individual seismic characteristics. This increases the safety of the building and creates a comfortable living space with less shaking.

[Brief explanation of the drawing]

FIG. 1 is a front view of the entire building frame showing the first embodiment of the present invention, FIG. 2 is a side view of a part of the frame,
3 is a partially cutaway side view of the variable control device, FIG. 4 is a plan view thereof, FIG. 5 is a sectional view showing the structure of the drive device, FIGS. 6, 7, 8, and 9. The figure is an explanatory view showing the principle of variable rigidity by a brace or a wall, and Figs. 10 and 11 are explanatory views showing an example of use on a wall. 1...Column, 2...Beam, 3...Brace, 4...
Variable control device, 5... Drive device, 6... Turnbuckle, 7... Gusset plate, 8... Hydraulic cylinder, 9... Cylinder receiver, 10... Compression coil spring, 11... Mounting screw, 12... Rod , 13... Piston rod, 14... Connection pin, 15... Drive device receiver, 16... Connection pin.

Claims (1)

[Claims] 1 A compression coil spring is installed between a frame composed of left and right columns and upper and lower beams, and a brace or wall installed within the structural surface of this frame, which changes the rigidity of the frame by the elastic force of the spring. and a drive device consisting of a hydraulic cylinder that can automatically control the variable stiffness device, and the drive device changes the elastic force of the coil spring to connect the brace or wall. By controlling the connection with the frame to a stress transmission state or a free state,
A variable rigidity structure for a building frame, characterized in that the degree of contribution of the brace or wall to the rigidity of the frame can be varied.