JPH02271128A - Suppressing of vibration and device therefor - Google Patents

Abstract

PURPOSE:To absorb the torsional vibration generated on a structure by installing a tank in which liquid is stored, into the upper part of a structure and by generating a turning moment on a tank through liquid by the torsional vibration of the structure. CONSTITUTION:Two damping devices 1 are installed oppositely on a roof-top in the upper part of a structure 2 or in a machine room, etc., and each damping device 1 has a tank 3 whose plenary shape is formed to a semicircular form having a width of W. The tank 3 has the outer and inner walls 3a and 3b which are formed into circular form having different radius, and acting walls 3c and 3d connecting the inner and outer walls 3a and 3b are arranged in te perpendicular direction to the tangential direction to the inner and outer walls 3a and 3b. Further, the liquid 5 such as water is stored, having the opened liquid surface 5a, in the tank 3.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a vibration damping method and a vibration damping device suitable for use in damping torsional vibrations that occur in structures such as buildings due to earthquakes, wind, etc. Regarding.

(b), Prior Art Recently, a tank containing a liquid such as water having a rocking frequency matching the natural frequency of the structure has been installed at the top of a 4G structure to absorb vibrations occurring in the structure. Proposals have been made to absorb this energy using the wave energy of the liquid in the tank.

(C) 1. Problems to be Solved by the Invention However, although such a device can absorb linear horizontal vibrations, it is inconvenient that it cannot absorb torsional vibrations occurring in the structure.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a vibration damping method and a vibration damping device capable of absorbing torsional vibrations occurring in a structure.

(d) Means for solving the zero problem, that is, the present invention provides a tank (3) in which a liquid (5) is stored in the upper part of a structure (2), and the liquid (5) is caused by torsional vibration of the structure. 5) to generate a rotational moment in the tank (3).

It is configured to attenuate torsional vibrations generated in the structure (2) due to the rotational moment.

In addition, one aspect of the present invention is to open the liquid (5) inside the liquid surface (5a).
In the tank (3) which is stored in the form of a liquid (5), acting walls (3c,
3d), and an outer wall (3a) and an inner wall (3d) are provided between the working walls.
b) in such a way that the flow of the liquid (5) between the working walls creates a rotational moment in the tank (3).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in one drawing.

This description is not limited to the description on the drawings.

- The same applies to the r(e) and effect J columns below.

(e) Zero effect With the above-described configuration, in the present invention, when torsional vibration occurs in the building (2), the liquid (5) in the tank (2) flows in a direction to cancel the torsional vibration.

It acts so that the torsional vibrations are damped.

(f), Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing one embodiment of a vibration damping device according to the present invention.

As shown in FIG. 1, two vibration damping devices 1 according to the present invention are installed on the roof of the structure 2, in a machine room, etc., facing each other. The tank 3 has a semicircular planar shape with a width W. The tank 3 has an outer wall 3a and an inner wall 3b formed in arc shapes with different radii. Working walls 3G and 3d connect the inner wall 3a and the outer wall 3b, and the inner wall 3a and the outer wall 3b
is provided in a direction perpendicular to the tangential direction of. Further, a liquid 5 such as water is stored in the tank 3 with an open liquid surface 5a.

Since the vibration damping device 1 according to the present invention has the above-described configuration, the structure 2 does not twist under normal circumstances, so the liquid 5 stored inside the tank 3 is kept at its liquid level 5a. parallel to the paper surface.

That is, it is held in a horizontal state.

Next, when torsional vibration occurs in the structure 2 in the directions of arrows A and B around its stiffness RC due to an earthquake or wind, etc.,
As structure 2 vibrates in the directions of arrows A and B, tank 3 also vibrates in directions A and B.
, vibrates in the B direction. Then, the liquid 5 stored inside
When the structure 2 moves in the direction of the arrow due to its inertia, the liquid 5 flows relatively in the direction of the arrow, presses the first working mold 3c, 3c in the direction of the arrow E, and flows through the tank 3. to apply a rotational moment to the structure 2 in the direction of arrow B, that is, in the opposite direction to the twisting direction of the structure 2,
It acts to cancel out the twist that occurs in the direction. Also,
When the structure 2 moves in the direction of the arrow B, the liquid 5 flows relatively in the direction of the arrow C, and the 1 action Q3d, 3d is caused by the arrow F.
Press in the direction.

Applying a rotational moment to the structure 2 through the tank 3 in the direction of arrow A, that is, in the opposite direction to the twisting direction of the structure 2,
It acts to cancel out the twisting that occurs in the structure 2 in the direction of arrow B. Therefore, by appropriately selecting the mass and viscosity of the liquid 5 stored in the tank 3, torsional vibrations occurring in the structure 2 in the directions of arrows A and B can be effectively damped.

In addition, in the above-mentioned embodiment, the outer wall 3a and the inner wall 3 of the tank 3
Although we have described the case where an arc-shaped shape is used as the shape of b, the shape of the inner and outer walls is not limited to the arc shape. The flow of the liquid 5 between the provided working walls 3c and 3d is
Of course, any shape, such as a 0-shape, may be used as long as the shape is such that rotational moment is generated in the tank 3.

(g) 1. According to the present invention, as described in detail, the tank 3 storing the liquid 5 is provided in the upper part of the structure 2, and the liquid 5 is transferred to the tank by the torsional vibration of the structure. Since the structure is configured such that a rotational moment is generated in the structure 2 and the torsional vibration generated in the structure 2 is damped by the rotational moment, it is possible to damp the torsional vibration generated in the structure 2 with an extremely simple configuration. .

Further, in the tank 3 in which the liquid 5 is stored so as to form an open liquid surface 5a, action g3c and 3d are provided at both ends of the tank 3 in the wave direction of the liquid 5.

Since the outer wall 3a and the inner wall 3b are formed between the working walls in such a manner that the flow of the liquid 5 between the working walls generates a rotational moment in the tank 3, the liquid 5 flows between the working walls. This makes it possible to generate a rotational moment in the tank 3, and it is possible to effectively prevent torsional vibrations caused in the structure due to the rotational moment.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of a vibration damping device according to the present invention. 1... Vibration control'! A placement 2...Structure 3...Tank 3a...Outer wall 3b...Inner wall 3c, 3d...Working wall 5...・Liquid Appearance Person Mitsui Construction Co., Ltd. Agent Patent Attorney (Phase 1) Shinji (and 1 other person)

Claims (2)

[Claims] (1) A tank storing a liquid is provided on the upper part of the structure, a rotational moment is generated in the tank through the liquid by torsional vibration of the structure, and torsional vibration is generated in the structure by the rotational moment. A vibration damping method configured to attenuate the (2) In a tank in which liquid is stored in the form of forming an open liquid surface, working walls are provided at both ends of the tank in the wave direction of the liquid, an outer wall and an inner wall are provided between the working walls, and an outer wall and an inner wall are provided between the working walls. A vibration damping device configured in such a way that the flow of liquid causes a rotational moment in the tank.