JPH02275134A - Damping device - Google Patents

Abstract

PURPOSE:To make it possible to cope with fluctuation in oscillation frequencies caused by the collapse and the like of the anti-seismic walls and the like of a structure at the time of earthquakes by connecting more than 2 tanks with one another, within each of which fluid is contained in such a way as to form an open fluid surface, through communicating sections. CONSTITUTION:When the anti-seismic walls and the like of a structure 2 are destroyed by severe earthquakes and the like while the structure 2 is lowered in oscillating frequencies, waves 5b caused within each outer section tank 3a are gradually intensified, fluid 5 within a tank 3 starts also to wave among section tanks 3a through communicating sections 3b. In this case, as for the waves 5b within the tank 3, the case where 3 tanks 3a are communicated with one another so as to be counted as the whole of the tank 3, is much more intensified than the case where each individual tank 3a is counted, the intensified waves 5b are thereby caused through the respective communicating sections 3b. In this case, the fluid 5 is moved among the respective tanks 3a through the communicating sections 3b, the communicating sections 3b also work on in such a way as to check the movement of the fluid 5 among the tanks 3a while acting also as a damping means to damp the waves of the fluid 5, thereby absorbing the oscillation of the structure 2 in the direction as shown by arrow heads C and D.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a vibration damping device suitable for use in damping vibrations generated in structures such as buildings due to earthquakes, wind, etc.

(b), Prior Art Recently, a tank storing a liquid such as water having a rocking frequency matching the natural frequency of the structure is installed on top of a structure, and vibrations generated in the structure are absorbed by the tank. (C) 1 Problems to be solved by the invention Since the size of such a tank was constant,
When an earthquake causes a change in the vibration frequency of a structure due to the destruction of the structure's earthquake-resistant walls, etc., there is an inconvenience in that it is not possible to respond appropriately.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a vibration damping device that can cope with fluctuations in vibration frequency occurring in a structure.

(d) Means for solving the problem 1 The present invention comprises two or more partial tanks (3a) in which a liquid (5) is stored with an open liquid surface (5a), These partial tanks (3a) are connected in series via a communication part (3b).

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

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

The same applies to the column "r(e), action" below.

(e) 1 Effect With the configuration described above, the present invention is such that while the vibration frequency of the structure (1) is high, the liquid (5) in each partial tank (3a) individually generates waves, and when the vibration frequency is low. Then, the plurality of partial tanks (3a) as a whole act to generate waves.

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

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

As shown in FIG. 1, the vibration damping device 1 has a tank 3 installed on the top of a structure 2, and the tank 3 has three divided partial tanks 3a. Each part tank 3
A has a dimension Ll in the direction of arrows C and D, and these partial tanks 3a are arranged in series in the horizontal direction, forming a tank 3 having an overall dimension L2. Also.

The partial tanks 3a are connected to each other via a communication portion 3b, and a liquid 5 such as water is stored inside the tank 3 with an open liquid surface 5a formed at the top.

Since the vibration damping device 1 has the above-described configuration, the structure 2 does not sway in the horizontal direction under normal conditions, and therefore, the liquid level 5a of the liquid 5 in the tank 3 maintains a horizontal state. It is stored in the form of

Furthermore, if the structure 2 shakes in the directions of arrows C and D due to earthquakes, wind, etc., the liquid 5 in the tank 3 will move in the directions of arrows C and D due to the vibration of the structure 2. A wave 5b is generated. When the frequency of the structure 2 is high, this wave 5b is
Within each partial tank 3a, vibrations occur individually as shown by the broken lines in the figure, and the vibrations are waves 5b generated within each partial tank 3a.
absorbed more effectively.

Furthermore, when the earthquake-resistant walls, etc. within the structure 2 are destroyed due to a major earthquake, etc., and as a result, the vibration frequency of the structure 2 decreases, the wave motion 5b generated within each partial tank 3a gradually increases, and as a result, the tank 3 The liquid 5 inside also starts flowing between the partial tanks 3a via the communication portion 3b. Then, the wave 5b inside the tank 3 becomes stronger when the three partial tanks 3a are connected as a whole in the tank 3 than in each partial tank 3a, as shown by the one-dot chain line in FIG. A large wave 5b is generated via the communication portion 3b. In this case, the liquid 5 is supplied to each partial tank 3a, 3 via the communication portion 3b.
a, but the communication part 3b is a partial tank 3 of the liquid 5.
Since it also acts in the direction of blocking the flow between points a, it also functions as a damping means for damping the wave motion of the liquid 5. In this way, the liquid 5 absorbs the vibrations of the structure 2 with its wave energy, and the communication portion 3b attenuates the waves, and as a result, the vibrations of the structure 2 in the directions of arrows C and D are absorbed.

It goes without saying that the installation position and shape of the communication part 3b that communicates between the respective partial tanks 3a, as well as the length L3 of the communication part 3b, can be appropriately set according to the desired vibration damping performance.

(g) 0Detailed Description of the Invention According to the present invention, as described above, the liquid 5 is opened to the liquid level 5.
Two or more partial tanks 3 stored inside in the form of a
a, and the partial tanks 3a are connected in series through the communication part 3b, so while the frequency of the structure 2 is high, the liquid 5 waves individually in each partial tank 3, causing vibrations. When the number becomes low, the liquid 5 flows between the plurality of partial tanks 3a via the communication part 3b, and the plurality of connected partial tanks 3
Since the entire structure a vibrates in waves, it becomes possible to generate waves from high to low frequencies with one vibration damping device 1, and it becomes possible to appropriately respond to changes in the vibration frequency of the structure 1.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of a vibration damping device according to the present invention. 1... Vibration damping device 3d... Partial tank 3b... Communication part 5... Liquid 5a... Liquid level

Claims (1)

[Scope of Claims] A vibration damping device comprising two or more partial tanks in which liquid is stored inside with an open liquid surface, and these partial tanks are connected in series through a communication part.