JPH02112535A - Device for variable rigidity and variably rigid structure - Google Patents

Abstract

PURPOSE:To improve reliability by fixing one of two cylinders, connected each other by a piston, to a column-and-beam frame and the other cylinder to a wall, and by making the rod-side pressure-oil chambers and the piston-side pressure-oil chambers of the both cylinders respectively connected through each other. CONSTITUTION:When a column-and-beam frame, formed of the columns 1 and the beam 2, is displaced, for instance, toward the right side making cylinders 4 and 5 separated each other, rod-side pressure-oil chambers (a) are contracted, while piston-side pressure-oil chambers (b) are enlarged. When an opening/closing valve 13 is held open, liquid in the rod-side pressure-oil chamber (a) moves to the piston-side pressure-oil chambers (b), making the rigidity at a wall 3 fail to work. When the opening/closing valve 13 is closed, the liquid is not allowed to flow, leaving pistons 7 locked and the rigidity of the wall is made to work effectively thereby.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable rigidity device used in a restraining structure and a variable rigidity structure using the device, and relates to a column-beam frame and a variable-rigidity structure incorporated therein. The rigidity of the structure can be varied by changing the connection state with restraining elements such as walls or braces.

[Conventional technology]

In Japanese Patent Application Laid-Open No. 62-268479, the applicant actively changes the stiffness of the building itself based on the judgment of a response prediction system based on the detected seismic motion, instead of the conventional passive earthquake resistance method. We are proposing an installation method that minimizes resonance and ensures the safety of the building, its equipment, residents, etc.

In addition, methods for changing the rigidity include expanding and contracting the braces within the structural surface surrounded by columns and beams, varying the rigidity of the braces themselves, and turning on and off the connection state of columns or beams and braces. Various proposals have been made for changing the rigidity of the frame by switching (Japanese Patent Application Laid-Open No. 63-7073).
Publication No. 4, Japanese Patent Application No. 61-258794, Japanese Patent Application No. 1987-
285069, Japanese Patent Application No. 62-285070, Japanese Patent Application No. 62-289780, etc.).

[Problem to be solved by the invention]

The present invention provides a new variable stiffness device that is easy to design and install, is highly reliable, and easy to maintain, and a variable stiffness device that incorporates the variable stiffness device, as a means of changing the stiffness in a variable stiffness building as described above. It is intended to provide a structure.

[Means to solve the problem]

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

The variable rigidity device of the present invention is installed between a column-beam frame consisting of columns 1 and beams 2 and a wall 3 or a brace within the column-beam frame. The device consists of two cylinders 4.5 connected by one piston rod 6, one of which is fixed to a column-beam frame and the other to a wall 3 via a buffer material 10, and the rod-side hydraulic pressure of both cylinders 4.5 is fixed. The rod side connecting pipe 11 connects the chambers a to each other.
The piston-side hydraulic chambers are communicated with each other through a piston-side connecting pipe 12. Furthermore, the rod side connecting pipe 1
1 and the piston-side connecting pipe 12 are connected via an on-off valve 13. With this configuration, it is possible to open and close the on-off valve 13 and control the movement and restraint of the piston 7 in response to commands from a control mechanism consisting of sensors, computers, etc. By adjusting this, the rigidity of the structure frame is made variable.

〔Example〕

Next, the illustrated embodiment will be described.

In the embodiment shown in FIG. 1, a wall 3 made of reinforced concrete (not limited to this) is provided within the structure surrounded by the left and right columns 1 and the upper and lower beams 2, separated from the left and right columns 1 and the upper beam 2. Two sets of devices of the present invention are connected and installed between the upper end of the wall 3 and the upper beam 2.

In the figure, cylinder 4 and cylinder 5 are connected by one piston rod 6. each cylinder 4.5
Inside, the pistons 7 at both ends of the rod 6 form a rod-side hydraulic chamber a.
and piston side hydraulic chamber, both cylinders 4
．． The rod-side hydraulic chambers a and the piston-side hydraulic chambers of No. 5 are connected by a rod-side connecting pipe 11 and a piston-side connecting pipe 12, respectively, to communicate with each other. Furthermore, the rod-side connecting pipe 11 and the piston-side connecting pipe 12 are connected via an on-off valve 13.

Both cylinders 4.5 are attached to fixing jigs 8 and 9 each having a U-shaped cross section via a plurality of cushioning materials 10, with one fixing jig 8 attached to the upper end of the wall 3 and the other fixing jig 9 attached to the upper end of the wall 3. is fixed to the bottom surface of beam 2. The cushioning material 10 is not particularly limited, but for example, a metal shock-absorbing spring (trade name "Shock Mount", manufactured by Aeroflex) with a metal wire rope spirally passed between two upper and lower metal retainers can be used. can.

The operating conditions are as follows.

(1) Opening of on-off valve 13 When the column-beam frame moves to the right (in the figure, left cylinder 4 and right cylinder 5 are separated), the rod-side hydraulic chamber a side of both cylinders 4.5 is It contracts and the piston side hydraulic chamber increases. If the on-off valve 13 is open, the liquid in the rod-side hydraulic chamber a smoothly moves to the piston-side hydraulic chamber a, and the rigidity of the wall 3 is not effective. When the column-beam frame moves to the left, the liquid flows in the opposite direction.

(2) State where the on-off valve 13 is closed Since the above-mentioned flow is stopped, the liquid does not flow, the piston 7 is in a locked state, and the rigidity of the wall 3 is effective.

In this embodiment, by connecting two sets of devices, the effectiveness of each cylinder 4.5 is made uniform.

〔Effect of the invention〕

(2) Since the variable rigidity device of the present invention is constituted by a simple hydraulic mechanism, it is easy to control, highly reliable, and easy to maintain.

■ By using a double cylinder and providing a cushioning material in between,
It is possible to reduce the impact caused by opening and closing the valve.

■ By installing multiple sets and connecting them, the effectiveness of each cylinder can be made uniform.

[Brief explanation of drawings]

FIG. 1 is a front view (partial view) showing an outline of the present invention. 1... Column, 2... Beam, 3... Wall, 4.5... Cylinder 6... Rod, 7... Piston, 8, 9...
...Fixing jig, 10...Buffer material, 11...Rod side connecting pipe, 12...Piston side connecting pipe, 13...Opening/closing valve,

Claims (3)

[Claims] (1) A variable rigidity device installed between a column-beam frame of a structure and a wall within the column-beam frame, which connects one of two cylinders connected by one piston rod to the column-beam frame. , the other is fixed to the wall via a cushioning material,
The rod-side hydraulic chambers and the piston-side hydraulic chambers of both cylinders are communicated with each other through a rod-side connecting pipe and a piston-side connecting pipe, respectively, and the rod-side connecting pipe and the piston-side connecting pipe are opened and closed by commands from a control mechanism. A variable rigidity device characterized by being connected via an on-off valve. (2) The variable rigidity device according to claim 1, wherein the walls within the column-beam frame are replaced with braces. (3) A variable-rigidity structure comprising a plurality of variable-rigidity devices according to claim 1 installed between a column-beam frame of a structure and a wall within the column-beam frame.