JPH0718273B2 - Vibration control device for structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention suppresses the vibration caused in a structure such as a skyscraper due to an earthquake or natural wind in the inertia of liquid in a tank installed in the structure. The present invention relates to a structure vibration damping device that is performed by force.

<< Prior Art >> Recently, in structures such as skyscrapers, it is necessary to suppress vibrations caused by earthquakes and natural winds in order to maintain comfort of residents. Therefore, for example, as disclosed in Japanese Patent Laid-Open No. 62-101764, a tank for storing liquid at a predetermined position of a structure at the same cycle as the natural cycle of the structure is provided and the vibration of the liquid is generated. The phase is set so as to deviate from the vibration phase of the structure by a predetermined amount, and the two are canceled each other to suppress the structure.

<< Problems to be Solved by the Invention >> However, in the technique disclosed in the above publication,
Since the liquid stored in the tank can freely vibrate, when vibrating, as shown in FIG. ), There is a problem that energy loss due to such excessive shaking of the liquid is large and an effective vibration suppressing effect cannot be sufficiently obtained.

The present invention has been made in view of the above background, and an object thereof is to provide a vibration damping device for a structure that can suppress free vibration of a liquid and reduce energy loss.

<< Means for Solving the Problem >> According to the present invention, a structure is provided with a tank containing a liquid that vibrates in different phases due to viscous resistance due to mutual contact, which has the same cycle as the natural cycle of the structure. In a structure vibration damping device, a movable partition plate is disposed inside a tank so that the partition plate can be moved by being immersed in the liquid, and the movable partition plate is connected to the structure through a movement control means for controlling the movement. It is characterized by having done.

According to the present invention, in the above-mentioned configuration, the tank is composed of a divided tank portion arranged at a distance from each other and a communication portion for communicating these divided tank portions, and the movable partition is immersed in the liquid in the communication portion. You may arrange | position and arrange a board.

Further, the present invention may be configured such that a saw member is provided between the movable partition plate and the movement control means in the above configuration.

<Operation> The operation of the present invention will be described. Since the movement of the movable partition plate, which tends to move in response to free vibration or shaking of the liquid, is controlled by the movement control means, the free movement of the liquid is reversed by this control force. Such vibrations are suppressed, and energy loss due to excessive shaking of the liquid is reduced.

In addition, the divided tank parts constituting the tank are arranged at a distance from each other, and these are connected by the communication part, and if the movable partition plate is disposed in the communication part, in addition to the movable partition plate,
Since the contact surface is increased by the communication part etc., the damping of the liquid can be made more reliable, and the liquid surface is at a higher position than the communication part, and the free surface of the liquid is reduced, so that the free surface caused by ripples can be reduced, Energy loss due to ripples can be reduced. Further, even if the volume is the same, the free surface in contact with the air can be reduced by the communicating portion, so that the contamination of liquid can be prevented.

Furthermore, by interposing a lever member between the movement control means and the movable partition plate, the control force of the movement control means can be doubled or the movement control stroke of the movable partition plate can be increased. It is possible to save labor and reduce size.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional side view of a main part of a structure showing an embodiment of the present invention.

The present invention basically has a structure in which a tank 3 containing a liquid W that has the same period as the natural period of the structure 2 and vibrates in different phases due to viscous resistance due to mutual contact is installed. In the vibration control device for an object, a movable partition plate 4 is disposed inside the tank 3 so as to be movable by being immersed in the liquid W, and the movable partition plate 4 is moved via a movement control means 6 for controlling the movement thereof. It is configured to be connected to the structure 2. Here, as the movement control means 6, specifically, a damper such as an oil damper or the like which achieves passive vibration control in which the moving force of the movable partition plate 4 is input and functions to suppress the movement thereof, or the movable partition plate 4 in advance. An actuator, such as a hydraulic cylinder, that achieves active vibration suppression that functions to suppress the movement by inputting a control force is adopted. Further, in the present embodiment, the structure between the movable partition plate 4 and the structure 2 is such that the movable partition plate 4 is connected via the rod 5 to the movement control means 6 arranged outside the tank 3. Further, the movement control means 6 is connected to the support portion 2a of the structure 2.

In order to suppress vibrations caused by earthquakes and natural winds, a tank 3 for storing the liquid W is installed on the roof of the structure 2, and the storage amount of the liquid W and the dimensions of each part of the tank 3 are appropriately set. By adjusting, the vibration phase of the liquid W is deviated by a predetermined amount with respect to the vibration period peculiar to the structure 2 caused by the natural wind or the like, and the vibrations of the liquid W and the vibration phase of the liquid W can be canceled to suppress the structure 2. There is.

The liquid W stored in the tank 3 is water that is generally used as drinking water and fire protection water for the structure 2. Inside the tank 3, the flat surface portion 4a is arranged so as to form a wall. The movable partition plate 4 is provided so as to be immersed in the liquid W, the movable partition plate 4 is provided so as to be relatively movable in the liquid W, and a rod 5 connected to the movable partition plate 4 is provided.
Is provided slidably with respect to the tank 3. The right end portion of the rod 5 is connected to the support portion 2a provided on the roof of the structure 2 via the movement control means 6.

Therefore, according to the above configuration, when the structure 2 vibrates,
Since the movement control means 6 controls the movement of the movable partition plate 4 that tends to move in response to the free vibration or shaking of the liquid W, the free vibration of the liquid W is suppressed by this control force. Therefore, the energy loss due to excessive shaking of the liquid W is reduced. In particular, if a damper is used as the movement control means 6, passive damping can be achieved, and if an actuator is used, active damping can be achieved. Further, since the flat surface portion 4a of the movable partition plate 4 increases the contact surface with the liquid W, the damping of the liquid W can be made more reliable and the damper effect can be improved, so that the vibration of the structure 2 can be reliably suppressed. And stable vibration control can be performed.

FIG. 2 shows another embodiment of the present invention. In the above-mentioned configuration, the tank 3 has a divided tank portion 3a arranged at a distance from each other and a communication portion 3b for communicating these divided tank portions 3a. The movable partition plate 4 is disposed in the communication portion 3b so as to be immersed in the liquid W.

Therefore, according to the configuration of the present embodiment as described above, in addition to the effects described above, the liquid W is brought into contact with the upper flat surface 3c of the communication portion 3b, and the contact surface is increased, so the damping of the liquid W is performed. It is possible to make it more reliable, improve the damper effect, and reliably suppress the vibration of the structure 2.

Further, the liquid surface of the liquid W is located at a position higher than the upper flat surface 3c of the communicating portion 3b, and the free surface of the liquid W is reduced, so that the free surface caused by the wave can be reduced, and the energy loss due to the wave can be reduced from this surface. Can also be reduced. And communication part 3b
As a result, even if the tank volume is the same, the free surface in contact with air can be reduced, so that the contamination of the liquid W can be prevented.

Now, FIG. 3 is a view showing still another embodiment, in which a saw member 12 is basically provided between the movable partition plate 4 and the movement control means 6.

More specifically, in the present embodiment, two movable partition plates 4 connected by a rod 8 are provided in the liquid W in the tank 3, and the movable partition plates 4 are further connected to the rod 5, the lever member 12, and the lever member 12. The movement control means 6 is used to connect and support the supporting portion 2a of the structure 2. In this embodiment, when the stroke of the movable partition plate 4 is larger than the stroke of the movement control means 6, the rod 5 and the movement control means 6 are connected via the lever member 12, and the leverage member is used. By setting 12 levers on the side of the movement control means 6 shorter than the levers on the side of the movable partition plate 4, the stroke of the movable partition plate 4 can be freely set without being restricted by the stroke of the movement control means 6. It will be possible. On the contrary, when the movement control means 6 has a small capacity, the lever member
12 can also be used, and the movement control means 6 of the lever member 12 can be used.
By setting the lever on the side longer than the lever on the side of the movable partition plate 4, the movable partition plate 4 can be controlled with a small control force, and the labor of the equipment can be saved. Further, in this embodiment, since the two movable partition plates 4 are installed, it goes without saying that the damping effect can be more sufficiently secured. The fulcrum 12a of the lever member 12 is fixed to the structure 2.

<< Effects of the Invention >> As described in detail in the above embodiments, according to the present invention, the following excellent effects are exhibited.

(1) Since the movement control means can control the movement of the movable partition plate that is going to move according to free vibration or shaking of the liquid, the free vibration of the liquid can be suppressed to the contrary by this control force. Energy loss due to excessive shaking of the liquid can be reduced.

(2) Further, since the liquid comes into contact with the upper surface of the communicating portion, the contact surface is increased in addition to the movable partition plate, so that the damping of the liquid can be made more reliable, and the liquid surface is in communication. Since the position is higher than the upper surface of the portion, the free surface of the liquid is reduced, and the free surface affected by the wave can be reduced, and thus the energy loss due to the wave can be reduced. Further, since the free surface contacting the air can be reduced by the communicating portion, it is possible to prevent the liquid from being contaminated.

(3) Further, since the lever member is provided between the movement control means and the movable partition plate, the control force of the movement control means can be doubled or the movement control stroke of the movable partition plate can be increased. It is possible to secure labor saving and downsizing of equipment.

[Brief description of drawings]

FIG. 1 is a sectional side view of an essential part of a structure showing an embodiment of the present invention, FIG. 2 is a sectional side view of an essential part of a structure showing another embodiment of the present invention, and FIG. FIG. 4 is a plan sectional view showing still another embodiment, and FIG. 4 is a sectional side view of a main part showing a conventional example. 2 ... Structure, 3 ... Tank 3a ... Divided tank part, 3b ... Communication part 4 ... Movable partition plate, 6 ... Movement control means 12 ... Lever member, W ... Liquid

Claims (3)

[Claims] 1. A vibration damping device for a structure, wherein a structure is provided with a tank containing a liquid that vibrates in the same cycle as the natural cycle of the structure and vibrates in different phases due to viscous resistance due to mutual contact. A movable partition plate is movably disposed inside the tank so as to be immersed in the liquid, and the movable partition plate is connected to the structure through a movement control means for controlling the movement. Vibration control device for characteristic structures. 2. The tank comprises a divided tank portion arranged at a distance from each other and a communication portion for communicating these divided tank portions, and the movable partition is immersed in the liquid in the communication portion. The structure vibration damping device according to claim 1, wherein a plate is provided. 3. The vibration damping device for a structure according to claim 1, wherein a saw member is provided between the movable partition plate and the movement control means.