JPH0363363A - Vibration controller for construction - Google Patents

Abstract

PURPOSE:To control the vibration of liquid by providing a partition plate capable of moving in the liquid in a tank containing liquid vibrating at a different phase with viscous resistance of mutual contact at the same natural period as that of a construction. CONSTITUTION:As a controller of a construction 2, liquid W vibrating at a different phase in viscous resistance of mutual contact at the same natural period as that of the construction 2 is contained in a tank 3 which is installed, and it is sunk into the liquid W contained in the tank 3 to provide a movable partition plate 4 so that it is capable of moving. The partition plate 4 is connected to the construction 2 by a movable control means 6. In a construction between the movable partition plate 4 and the construction 2, the movable partition plate 4 is connected to the movable control means 6 arranged to the outside of the tank 3 through a rod 5, and the movable control means 6 is connected to a bearing section 2a of the construction 2. In the constitution, energy loss caused by excessive vibrations of the liquid can be reduced by a controlling force.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention aims to suppress vibrations caused by earthquakes and natural winds in structures such as skyscrapers by using the inertia of liquid in a tank installed in the structure. This invention relates to a vibration damping device for structures that uses force.

(Prior Art) Recently, in structures such as skyscrapers, there has been a need to suppress vibrations caused by earthquakes and natural winds in order to maintain the comfort of residents. For this reason, as disclosed in JP-A-62-101764, for example, a tank is provided at a predetermined position of a structure to store a liquid with the same period as the natural period of the structure, and the vibration of the liquid is The phase is set to be shifted by a predetermined amount from the vibration phase of the structure so that both cancel each other out, thereby suppressing the vibration of the structure.

(Problem to be solved by the invention) However, with the technology disclosed in the above publication,
Since the liquid stored in the tank is designed to be able to vibrate freely, when it vibrates, the liquid W collides with the peripheral wall of the tank 1 due to the ripples on the surface of the liquid W, as shown in FIG.
There is a problem that energy loss due to such excessive agitation of the liquid is large, making it impossible to obtain a sufficiently effective vibration suppressing effect.

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 Problems) The present invention provides a structure with a tank containing a liquid that vibrates at the same period as the natural period of the structure and at a different phase due to viscous resistance due to mutual contact. In a vibration damping device for a structure, a movable partition plate is disposed inside a tank so that it can be moved while immersed in liquid, and the movable partition plate is connected to the structure via a movement control means that controls the movement of the partition plate. It is characterized by what it did.

Further, in the above structure, the present invention includes a tank including divided tank parts arranged at intervals and a communication part that communicates these divided tank parts, and a movable partition that is immersed in the liquid in the communication part. It may also be constructed by arranging plates.

Furthermore, the present invention may be constructed by interposing a lever member between the movable partition plate and the movement control means in the above structure.

(Function) Regarding the function of the present invention, since the movement of the movable partition plate that attempts to move in response to the free vibration or agitation of the liquid is controlled by the movement control means, this control force causes the movement of the liquid to move in response to the free vibration or agitation of the liquid. Free vibrations are suppressed, and energy loss due to excessive agitation of the liquid is reduced.

In addition, the divided tank parts constituting the tank are arranged at intervals from each other, and these are connected by connecting parts.
If a movable partition plate is installed in the communication section, the contact surface will be increased by the communication section in addition to the movable partition plate, so the damping of the liquid will be more reliable, and the liquid level will be at a higher position than the communication section. Since the free surface of the liquid is reduced, the free surface exposed to ripples can be reduced, and energy loss due to ripples can be reduced. Furthermore, even if the capacity is the same, the free surface that comes into contact with air can be reduced due to the communication portion, so that liquid contamination 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, and the equipment can be controlled. It is now possible to ensure labor saving and downsizing.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-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 having the same period as the natural period of the structure 2 and vibrating at a different phase due to viscous resistance due to mutual contact is installed in the structure 2. In the vibration damping device for an object, a movable partition plate 4 is disposed inside a tank 3 so as to be movable by being immersed in a liquid W, and the movable partition plate 4 is controlled via a movement control means 6 that controls the movement of the movable partition plate 4. It is configured by being connected to the structure 2. Specifically, the movement control means 6 is a damper such as an oil damper that achieves passive vibration damping that functions to suppress the movement of the movable partition plate 4 when the movement force of the movable partition plate 4 is input, or a damper that is used in advance to control the movement of the movable partition plate 4. An actuator such as a hydraulic cylinder is used to perform active vibration damping, which functions to input a control force to suppress the movement of the vibration. Further, in this embodiment, the structure between the movable partition plate 4 and the structure 2 is such that the movable partition plate 4 is connected to the movement control means 6 disposed outside the tank 3 via the rod 5, and Further, a movement control means 6 is connected to the support portion 2a of the structure 2.

A tank 3 for storing liquid W is installed on the roof of this structure 2 in order to suppress vibrations caused by earthquakes and natural winds, and the storage amount of liquid W and the dimensions of each part of the tank 3 are adjusted as appropriate. By adjusting, the vibration phase of the liquid W can be shifted by a predetermined amount with respect to the vibration period specific to the structure 2 caused by natural wind, etc., and the vibrations of both can be canceled out, thereby damping the vibration of the structure 2. There is.

The liquid W stored in the tank 3 is water that is generally used as drinking water and fire prevention water for the structure 2, and is arranged in the tank 3 so that its flat surface portion 4a forms a wall. A movable partition plate 4 is provided to be immersed in the liquid W, and 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 connected to the tank 3. It is provided so that it can slide freely. The right end portion of the rod 5 is connected to a support portion 2a provided on the roof of the structure 2 via a movement control means 6.

Therefore, according to the above configuration, when the structure 2 vibrates,
Since the movement of the movable partition plate 4 that attempts to move in response to the free vibration or oscillation of the liquid W is controlled by the movement control means 6, the free vibration of the liquid W is suppressed by this control force. Thus, energy loss due to excessive agitation of the liquid W is reduced. In particular, if a damper is used as the movement control means 6, passive vibration damping can be achieved, and if an actuator is used, active vibration damping can be achieved. In addition, 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 the vibration of the structure 2 can be reliably suppressed. This enables stable vibration suppression.

FIG. 2 shows another embodiment of the present invention, in which the tank 3 has divided tank parts 3a arranged at intervals from each other and a communication part 3b which communicates these divided tank parts 3a. A movable partition plate 4 is disposed within the communication portion 3b so as to be immersed in the liquid W.

Therefore, according to the configuration of this embodiment as described above, in addition to the above-mentioned effects, liquid W is applied to the upper flat surface 3C of the communication portion 3b.
are brought into contact with each other, and the contact surface increases, so that the damping of the liquid W can be made more reliable, the damper effect can be improved, and the vibrations of the structure 2 can be reliably suppressed.

In addition, since the liquid level of the liquid W is at a higher level than the upper flat surface 3c of the communication portion 3b, and the free surface of the liquid W is reduced, the free surface exposed to ripples can be reduced, and energy loss due to ripples can be reduced from this surface. can also be reduced. Furthermore, the communication portion 3b allows the free surface in contact with air to be reduced even if the tank capacity is the same, so that the liquid W can be prevented from becoming contaminated.

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

Specifically, in this embodiment, two movable partition plates 4 connected by a rod 8 are provided in the liquid W in the tank 3, and these movable partition plates 4 are connected to a rod 5. Lever member 12. It is configured to be connected and supported by the support portion 2a of the structure 2 via the movement control means 6. 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. By setting the levers on the 12 movement control means 6 side shorter than the levers on the movable partition plate 4 side, the stroke of the movable partition plate 4 can be freely determined without being restricted by the stroke of the movement control means 6. becomes possible. Conversely, this lever member 12 can also be used when the capacity of the movement control means 6 is small, and the lever on the movement control means 6 side of the lever member 12 is set longer than the lever on the movable partition plate 4 side. Therefore, the movable partition plate 4 can be controlled with a small control force, and the labor of the equipment can be reduced. Furthermore, in this embodiment, since two movable partition plates 4 are provided, it goes without saying that a more sufficient damping effect can be ensured. Note that the fulcrum 12a of the lever member 12 is
It will be fixed to the structure 2.

(Effects of the Invention) As explained in detail in the examples above, according to the present invention, the following excellent effects are exhibited.

(1) Since the movement of the movable partition plate, which attempts to move in response to the free vibration or oscillation of the liquid, can be controlled by the movement control means, this control force can conversely suppress the free vibration of the liquid; Energy loss due to excessive agitation of the liquid can be reduced.

(2) Also, since the liquid will come into contact with the upper surface of the communication part, the contact surface will be increased in addition to the movable partition plate, making damping of the liquid more reliable. Since the free surface of the liquid is reduced, the free surface exposed to ripples can be reduced, thereby reducing energy loss due to ripples. Furthermore, since the free surface that comes into contact with air can be reduced due to the communication portion, it is also possible to prevent contamination with liquid.

(3) 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 ensure labor saving and downsizing of equipment.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of a main part of a structure showing one embodiment of the present invention, FIG. 2 is a cross-sectional side view of a main part of a structure showing another embodiment of the present invention, and FIG. FIG. 4 is a sectional plan view showing still another embodiment, and FIG. 4 is a sectional side view showing a main part of a conventional example.

Claims (3)

[Claims] (1) In a vibration damping device for a structure in which a tank containing a liquid that has the same period as the natural period of the structure and vibrates at a different phase due to viscous resistance due to mutual contact is installed in the structure, A movable partition plate is disposed inside the tank so that it can be moved by being immersed in the liquid, and the movable partition plate is connected to the structure via a movement control means that controls the movement of the partition plate. Vibration damping device for structures. (2) The tank is composed of divided tank parts arranged at intervals from each other and a communication part that communicates these divided tank parts, and the movable partition plate is immersed in the liquid in the communication part. A vibration damping device for a structure according to claim 1. (3) The vibration damping device for a structure according to claim 1, wherein a lever member is interposed between the movable partition plate and the movement control means.