JPH02261171A - Damping applying device for earthquake-proof structure - Google Patents

Abstract

PURPOSE:To change the rigidity of a structure so as to improve an earthquake proof effect by non-resonance by interposing a damping applying device comprising a cylinder, a viscous fluid, a check valve and a large-flow selector valve, etc., in a variable-rigidity structure. CONSTITUTION:As a measure to counter vibration to disturbance input to a variable-rigidity structure, a cylinder 2 comprising a piston 3 and a rod 4 is formed. In the cylinder 2, damping applying device 1 formed by connecting pipelines 8, 9 for a viscous fluid, check valves 6, 7 to a large-flow selector valve 10 is interposed between a pillar beam mounting frame as a bridge main body 31 and a reversed V-shaped column 35 as a variable-rigidity element. According to the indication of a solenoid 15 at the time of external disturbance, a shutoff valve 11 and a selector valve 10 are operated to change the flow of a viscous fluid. By this arrangement, the rigidity of a structure is changed to reduce the responsiveness of the structure by an earthquake-proof effect of non-resonance and a damping effect produced by the viscosity of a fluid and improve the safety of the structure.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention connects the frame body of a structure and a variable rigidity element, or variable rigidity elements provided within the frame, and changes the connection state. It relates to a device for protecting structures from vibration disturbances, and in addition to locking/unlocking functions, it has a damping effect using viscous fluid.

[Conventional technology]

The applicant incorporates variable rigidity elements in the form of places, walls, etc. within the column and beam frame of the structure, and the rigidity of the variable rigidity element itself,
Alternatively, the state of connection between the frame body and the variable rigidity element can be made variable, and the characteristics of the external vibrational force such as earthquakes and wind are analyzed using a computer, and the rigidity of the structure is changed to make it non-resonant. Various active restraint systems and variable rigidity structures have been proposed to ensure the safety of objects (for example, Japanese Patent Application Laid-Open Nos. 62-268479 and 61114770).
No., JP-A-63-114771, etc.).

[Problem to be solved by the invention]

By the way, conventional active restraint systems mainly focus on the relationship between the predominant period of seismic motion and the natural frequency of the structure (usually, the first natural frequency is often the problem). By actively shifting the natural frequency of the structure relative to the period, resonance phenomena are avoided and the amount of response is reduced.

However, especially in the case of earthquake motion, since it is an unsteady vibration, there may be cases where sufficient effects may not be obtained, for example, when the dominant period is not clear or there are multiple dominant periods.

The device of the present invention can lock and lock when interposed between a frame body and a variable rigidity element, or between variable rigidity elements.
In addition to the restraining function in terms of non-resonance due to unlocking, by adding large damping properties, the amount of response of the structure is reduced, ensuring the safety of the structure and creating a comfortable living space. It is intended to.

[Means to solve the problem]

Below, the damping adding device of the present invention will be explained using the reference numerals corresponding to the embodiments.

The damping device of the present invention is one in which a viscous fluid is sealed in place of the hydraulic oil in a single hydraulic cylinder type device, and the main body of the device is a double rod type piston that reciprocates within a cylinder 2, as shown in Fig. 1. Hydraulic chambers 5 (actually filled with viscous fluid, not oil) are provided on the left and right sides of 3, and the viscous fluid in the left and right hydraulic chambers 5 is closed or made to flow by a large flow rate switching valve 10. This makes the piston 3 fixed or movable left and right.

One of the cylinder 2 and the rod 4 is connected to the frame body and the variable rigidity element or one of the variable rigidity elements of the structure, and the other is connected to the frame body and the other of the variable rigidity element or the variable rigidity elements.

The left and right hydraulic chambers 5 are respectively provided with an outflow prevention check valve 6 that prevents viscous fluid from flowing out from the hydraulic chamber 5 and an inflow prevention check valve 7 that prevents viscous fluid from flowing into the hydraulic chamber 5. An inflow passage 8 that connects the left and right outflow prevention check valves 6 and an outflow passage 9 that connects the left and right inflow prevention check valves 7 are connected to the cylinder 2.
Located along the main body.

At the connecting position of these inflow channel 8 and outflow channel 9,
A large flow rate switching valve 10 is provided.

The large flow switching valve 10 has, for example, an inlet port 12 and an outlet port 13 at one end of the valve body, and a back pressure port 1 at the other end.
4, with an inlet port 12 and a back pressure port 1
By providing a shutoff valve 11 in the flow path connecting 4 to the back pressure port 14 to prevent the viscous fluid from flowing out to the back pressure port 14 side, a large volume of viscous fluid can flow at high speed and can be shut off instantly.

Note that, as the viscous fluid, for example, added turbine oil, glycerin, etc. can be used.

[For production]

The damping device of the present invention is a double rod cylinder type, and is provided with two flow paths, an inflow flow path 8 and an outflow flow path 9, check valves 6 and 7, and a large flow switching valve 10 along the cylinder 2. As a result, the length of the passage can be shortened, the area of the passage can be increased, and the passage resistance can be reduced, so that a large amount of viscous fluid can flow at high speed and can be shut off instantaneously. Further, by using the back pressure type large flow rate switching valve 10, it can be opened and closed instantaneously, and in combination with the above-mentioned structure, the response speed can be extremely accelerated.

Next, the operating state of the damping adding device 1 of the present invention will be explained.

(1) Large flow switching valve open When the shutoff valve 11 is open, the piston 3 in Fig.
Due to the leftward movement of , the viscous fluid in the left hydraulic chamber 5 passes through the inflow prevention check valve 7 and the outflow channel 9 and pushes up the large flow rate switching valve 10 .

Since the left outflow prevention check valve 6 and the right inflow prevention check valve 7 are closed by the viscous fluid under pressure, the inflow flow path 8 and the right outflow prevention check valve 6 are closed.
The viscous fluid from the large flow rate switching valve 10 flows through it. As a result, viscous fluid flows from the left hydraulic chamber 5 to the right hydraulic chamber 5, and the piston 3 moves leftward due to external force.

Even when the piston 3 moves to the right, the actuation is symmetrical to this, and the piston 3 moves to the left due to external force.

(2) Large flow switching valve closed When the shutoff valve 11 is in the closed state and an external force is applied to the piston 3 in the left direction, the pressure of the viscous fluid up to the large flow switching valve 10 increases, and the large flow switching valve 10 However, since the shutoff valve 11 receives the pressure of the viscous fluid in the back pressure port 14, the large flow rate switching valve 10 is also fixed in a closed state, and the piston 3 is prevented from moving.

The same applies when an external force is applied to the piston 3 in the right direction.

When the above-mentioned damping addition device 1 using viscous fluid is installed between the frame body and the variable rigidity element, in addition to the non-resonance effect due to the rigidity change of the frame in response to locking/unlocking, the viscous fluid itself A large damping effect is obtained due to viscosity, and since the viscous fluid has a small Reynolds number, the damping force on the frame body is given as a resistance force (P=cv) that is approximately proportional to the relative speed of the cylinder 2 and the piston 3.

〔Example〕

The present invention will be described below based on an illustrated embodiment.

FIG. 1 shows the specific structure of the damping adding device 1 of the present invention.The main body of the device 1 includes a double rod-shaped piston 3 in a cylinder 2, with the piston rod 4 protruding from both ends. It is slidably inserted. piston 3
The hydraulic chambers 5 formed on the left and right sides each include an outflow prevention check valve 6 that prevents the viscous fluid from flowing out of the hydraulic chamber 5, and an inflow prevention check valve that prevents the viscous fluid from flowing into the hydraulic chamber 5. A valve 7 is provided.

The check valve 6.7 has a structure in which, for example, a ring-shaped valve body is biased by a spring to allow pressurized viscous fluid to flow only in one direction. By providing an inflow channel 8 that connects and an outflow channel 9 that connects the left and right inflow prevention check valves 7, and connect these via a large flow rate switching valve 10, the left and right hydraulic chambers 5 can be connected. It communicates.

In this embodiment, an inlet port 12 and an outlet port 13 are formed at one end of the large flow switching valve 10, and a back pressure port 14 is formed at the other end, and a bypass is formed from the back pressure port 14 to the inlet port 12. A shutoff valve 11 is provided. This shaft off valve 11 can be switched between two positions, open and closed, using a solenoid 15.

Further, as shown in the figure, the cylinder 2 has an inflow channel 8.
Install the accumulator 16 that communicates with the.

FIGS. 2 to 9 show examples of application positions of the damping adding device 1 to the structure frame.

In the example shown in FIG. 2, the damping device 1 is interposed between the column-beam frame as the frame body 31 and the inverted V-shaped place 35 as the variable rigidity element.

In the example shown in FIG. 3, the damping device 1 is interposed between the column-beam frame as the frame body 31 and the frames 41 that are erected or suspended from the upper and lower beams 34, and the moment resistance is used as a variable rigidity element. This is a case where a frame is configured.

In the example shown in FIG. 4, the damping device 1 is interposed between the column-beam frame as the frame body 31 and the RC shear wall 42 as the variable rigidity element.

The example in FIG. 5 is an example in which a damping addition device 1 is provided at the base of a seismic isolation structure in combination with a seismic isolation rubber 43 such as laminated rubber. playing a role. The variable stiffness element in this case can be considered the foundation of the structure.

In the example shown in FIG. 6, an X-shaped place 44 provided within the column-beam frame as the frame body 31 is used as a variable rigidity element, and a damping addition device 1 is interposed laterally (horizontal type) in the center of the X-shape.

Like the example in FIG. 6, the example in FIG. 7 is an example applied to an X-type place 45, and while the example in FIG. Installed vertically,
It is vertical.

The example of FIG. 8 is similar to the example of FIG. 4, in which the damping addition device 1 is interposed between the column-beam frame as the frame body 31 and the RC shear wall 46 as the variable rigidity element. A feature is that the damping device 1 is provided above an opening 47 such as an entrance/exit.

In the example shown in FIG. 9, the damping addition device 1 is interposed in the center of an X-shaped place 48 in a large frame, and the middle beam 49 and place 48 are separated.

〔Effect of the invention〕

As mentioned above, the variable rigidity device according to the present invention is a double-rod cylinder type, and the cylinder is provided with two viscous fluid flow paths, a check valve, and a large flow rate switching valve, and also has a back pressure type large flow rate switching valve. Since the flow path is opened and closed by the , it is possible to efficiently flow a large amount of viscous fluid and turn on and off instantly with good response.

When applied to a variable-rigidity structure, the variable-rigidity device can be turned on and off in response to external disturbances such as seismic motion input to the structure.
By switching between locking and unlocking as an OFF/Zunawara coupling device, it changes the rigidity of the structure and provides a damping effect due to non-resonance, as well as a damping effect due to the viscosity of the viscous fluid on the structure frame. , it is possible to reduce the amount of response of the structure, ensure safety, and realize a comfortable living space.

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram showing the basic structure of an embodiment of the damping device of the present invention, and FIGS. 2 to 9 are schematic diagrams showing examples of application positions of the damping device of the present invention to a structure frame. It is. 1... Damping addition device, 2... Cylinder, 3...
Piston, 4... Rod, 5... Hydraulic chamber, 6...
Check valve for outflow prevention, 7... Check valve for inflow prevention, 8... Inflow channel, 9... Outflow channel, 10...
・Large flow rate switching valve, 11... Shutoff valve, 12.
...Inlet port, 13...Outlet port, 14...Back pressure port, 15...Solenoid, 16...Accumulator

Claims (2)

[Claims] (1) A cylinder connected to the frame body of the structure and the variable stiffness element or one of the variable stiffness elements, and a cylinder connected to the frame body and the other of the variable stiffness element or the variable stiffness elements and reciprocated within the cylinder. a double-rod type piston, a hydraulic chamber provided on both sides of the piston, a pair of outflow prevention check valves that prevent fluid from flowing out of both of the hydraulic chambers, and a pair of check valves that prevent fluid from flowing into both of the hydraulic chambers. a pair of inflow prevention check valves to be blocked; an inflow channel that connects both of the outflow prevention check valves; an outflow channel that connects both of the inflow prevention check valves; and the inflow channel and the What is claimed is: 1. A damping addition device for a vibration damping structure, comprising a large flow rate switching valve provided at a connection position of an outflow channel, and filled with viscous fluid instead of hydraulic oil of a hydraulic device. (2) The large flow switching valve has an inlet port and an outlet port on one end of the valve body, a back pressure port on the other end, and a flow path connecting the inlet port and the back pressure port. 2. The damping device for a vibration damping structure according to claim 1, further comprising a shutoff valve for preventing the viscous fluid from flowing out to the back pressure port side.