JPH01169067A - Vibration control device for structure - Google Patents

Abstract

PURPOSE:To improve reliability apt to decline as time passes, by equipping damping members to damp undulation of liquid in a liquid tank, filled with liquid, which is formed in a shape having a stretcher side along the wave motion direction, and by installing wave dissipating devices at the upper part of the liquid tank. CONSTITUTION:A liquid tank 5a is filled with liquid 5b of water-type or the like, and is equipped with meshes 5c, made of stainless steel or vinylon, as damping members, which are installed in two stages of the upper and lower sides. The liquid tank 5a is further equipped with a covering member 5g, which is equipped, on the both side of the left and right, with wave dissipating devices 5h, made of porous material, and a vibration controlling device is formed thereby. On the top of a building structure, two of such vibration controlling device 5 are installed, making an L-shape. When the liquid 5b inside the device undulates by an earthquake or the like, the liquid 5b penetrates the meshes 5c as it rises and falls. The undulation is damped thereby, and vibration energy is absorbed. When the undulation is enhanced, wave 5i flows into the wave dissipating devices 5h and the energy is absorbed thereat.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a vibration damping device capable of suppressing vibrations of structures caused by wind, earthquakes, and the like.

(b), Prior Art Recently, in structures such as observation towers, high-rise residential buildings, and high-rise office buildings, where the primary natural vibration period of a flexible structure is relatively long, the structure is located near the top of the structure. Attempts are being made to reduce the shaking of structures caused by wind or earthquakes by installing restraint devices to absorb the vibration energy of objects.

(C) 0 Problems to be solved by the invention Most of these vibration damping devices are composed of large-scale mechanical devices that swing balance weights, and the reliability of the devices over time and maintenance and inspections cannot be guaranteed. There are many problems in this respect.

The present invention aims to solve the above-mentioned drawbacks. An object of the present invention is to provide a vibration damping device for a structure that has reliability over time and can be easily maintained and inspected without using complicated mechanical devices.

(d) Means for solving the first problem, that is, the present invention provides a liquid tank in which liquid is injected ( 5a), the liquid tank (5a)
Damping members (5c, 5d, 5
e), and a wave dissipating device (5h, 5h) is provided above the liquid tank (5a).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r (e) below
The same applies to the column ``, action''.

(e) Zero effect With the above-described configuration, the present invention is capable of suppressing vibrations of the structure (1) due to wind or earthquakes by shaking the liquid (5b) in the liquid tank (5a) of each vibration damping device (5). act to absorb the vibration energy.

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

Fig. 1 is a diagram showing an example of a structure in which an embodiment of the damping device according to the present invention is used, Fig. 2 is a perspective view showing an example of the arrangement of the damping device, and Fig. 3 is a diagram showing an example of the arrangement of the damping device. 4 is a front sectional view of the damping device shown in FIG. 3, FIG. 5 is a plan view showing another embodiment of the damping device, and FIG. 6 is the allocation shown in FIG. 5. A front sectional view of the device, FIG. 7 is a plan view showing yet another embodiment of the vibration damping device, FIG. 8 is a front sectional view of the vibration damping device of FIG. FIG. 10 is a plan view of FIG. 9, FIG. 11 is a plan view of another example of the arrangement of the vibration damping device, and FIG. 12 is a plan view of another example of the arrangement of the vibration damping device. 13 is a front view showing another example of a structure in which the vibration damping device is used, FIG. 14 is a plan view showing yet another example of the arrangement of the vibration damping device, and FIG. 15 is the vibration damping device. FIG. 16 is a front sectional view showing still another example of the vibration damping device.

As shown in FIG. 1, the superhigh-rise building 1, which is a structure, has a structure 3 erected on the ground 2, and a vibration damping bag 225 according to the present invention is installed on the top 3a of the structure 3. is set up. As shown in FIG. 2, two vibration damping devices 5 are installed so as to cross each other at right angles, and each vibration damping device 5 has a lid on the top, as shown in FIGS. 3 and 4. The liquid tank 5a has a rectangular planar shape and is provided with 5g of liquid. Each liquid tank 5a is injected with water or a liquid 5b having a viscosity equal to or higher than that of water, and the injected liquid 5b causes the liquid tank 5a to flow as shown in FIG. The wave water surface 5f on which the liquid 5b oscillates is formed into a flat rectangular shape.

Furthermore, meshes 5c as damping members made of stainless steel, vinylon, high-performance fibers, etc. are installed on both left and right sides of the liquid tank 5a in FIG. At the top, on both sides of the lid body 5g, a wave dissipating device 5 is installed.
The wave dissipating device 5h is composed of a porous member made of iron scraps, crushed stones, metal chips, etc. formed into a block shape.

[Super High-rise Building] has the above configuration, so when the structure 3 shakes due to an earthquake, strong wind, etc., the vibration damping device 5 installed at the top 3a also shakes. Then, as shown in FIGS. 3 and 4, the liquid 5b in the vibration damping bag M5 moves in the longitudinal direction WD of the wave water surface 5f in synchronization with the vibration of the structure 3.
to sway.

That is, the oscillation period of the liquid 5b (the oscillation period of the liquid 5b is determined by the length Ll in the long side direction of the liquid tank 5a and the liquid height 3 in the stationary state of the liquid 5b, as shown in FIGS. 3 and 4). By matching the first natural vibration period of the skyscraper 1 (determined by absorb. When the liquid 5b swings,
Due to this rocking, the liquid 5b passes through the mesh 5C installed in the liquid tank 5a in the vertical direction in FIG.
The viscous resistance that acts between the liquid 5b and the liquid 5b acts in a direction that restricts the movement of the liquid 5b. As a result, the vibration of the liquid 5b is attenuated, and the ability to absorb vibration energy is improved.

Furthermore, when the shaking of the structure 3 exceeds a predetermined value, the wave height of the liquid 5b within the damping value 'r15 also increases.9 As shown in FIG. 4, the top 51 of the wave 51 reaches the lid 5g. It becomes like this. However, if the crest 5j of the wave directly hits the lid 5g and bounces back, the period of the liquid 5b is disturbed, making it impossible to exhibit an appropriate vibration damping effect. However, wave breakers 5h, 5h are installed on both sides of the liquid tank 5a in the wave motion direction where the crest 5j of the wave 51 occurs, and when the wave 5i collides with the wave breaker 5h, the wave 51 is disposed within the wave breaker sh. The energy flows in a distributed manner into the many pores of the porous member, and its energy is effectively absorbed, without the generation of bouncing waves that would disrupt the wave cycle in the tank. Furthermore, the lid part 5g
It is also possible to prevent the lid portion 5g from being deformed due to excessive pressure being generated on the lid portion 5g due to the direct light of the waves. Therefore, the vibration damping device 5 can smoothly absorb vibrations.

In addition, although the above-mentioned embodiment described the case where the mesh 5C is used as a damping member provided in the liquid tank 5a, the damping member can also be used to damp the vibration of the liquid 5b in the liquid tank 5a. As long as it can be of any form, shape, or installation mode, for example, mesh:
As shown in FIGS. 5 and 6, L5c is connected to the liquid tank 5a.
A plurality of them may be installed so as to be separated in the direction of the line in Fig. 6. Furthermore, as shown in FIG. 16, the mesh 5c is placed in the liquid tank 5a.
Of course, it is also possible to provide them in an appropriate combination in the vertical and horizontal directions.

In addition, it is not limited to mesh 5C, for example, Figs.
As shown in the figure, in the liquid tank 5a, the wave direction of the liquid 5b,
That is, partition walls 5d are provided in a manner that separates them in the left and right direction in the figure (the waving water surface 5f is divided into a plurality of parts), and projections 5e are provided on the partition walls 5d.
w1 in a shape that matches the oscillation form of the liquid 5b (i.e., in a shape with a concave center part, for example, as shown in FIG. 8).
Of course, it is also possible to provide a structure in which the vibration of the liquid 5b is damped by the viscous resistance generated between the protrusion 5e and the liquid 5b. Furthermore, a material in the form of steel chips, a plastic molded product, or the like may be installed as a damping member in the liquid tank 5a.

Furthermore, the manner in which the damping device 5 is arranged can be selected as appropriate depending on the placement location and the required damping performance. That is, since the wave motion of the liquid 5b occurs in the longitudinal direction of each vibration damping device 5,
By installing the wave water surface 5f of each vibration damping device 5 in the longitudinal direction WD toward at least two directions of the building 1 where vibrations are to be absorbed, each vibration damping device 5 is provided with the shaking separated into at least two directions. It is possible to exert a large vibration damping effect. For example, as shown in FIGS. 9 and 10,
The plurality of damping devices 5 are oriented in two horizontal directions in which the longitudinal direction WD, which is the wave formation direction of the wave water surface 5f, is orthogonal to each other (
It is also possible to arrange them as follows. By doing so, it becomes possible to effectively absorb the shaking that occurs in the building 1 in two directions at right angles. Furthermore, as an installation mode of the vibration allocating device 5, as shown in FIGS. 11 and 15, it is also possible to arrange a large number of vibration damping devices 5 along the outer wall 1a of the building 1 ( In the case of the figure, it is also placed at the center of building 1.), in such a case, it is placed at the top 3a of building 1.
Even if there is existing equipment such as an elevator machine room,
It becomes possible to install the allocation device 5 in a manner that avoids such existing equipment, and furthermore, it becomes possible to aim at effective use of building space. Further, in the case of a building 1 having a circular planar shape, a large number of vibration damping devices 5 may be arranged along the circular outer wall 1a, as shown in FIG. Furthermore, the 14th
As shown in the figure, it is of course possible to arrange the damping bags M5 radially. Further, by arranging the vibration damping device 5 along the outer wall 1a of the building 1 where the amplitude becomes large, it is possible to significantly enhance the vibration damping effect.

Furthermore, as structures to which the vibration damping device 5 according to the present invention is applied, flexible structures with a relatively long vibration period are suitable, and in addition to the super high-rise building 1 shown in FIG. Of course, the present invention can also be applied to a tower 6 made of a steel frame or the like as shown in FIG. 13.

The amount of the liquid 5b in the liquid tank 5a is such that the weight of free water that contributes to rocking is 0.5 to 2% of the weight of the structure (the greater the weight of free water, the higher the damping effect), and the damping member. When the damping constant is about 2 to 10%, the damping effect can be exhibited.

Further, in the above embodiment, the wave absorbing device 5h is provided on both sides of the liquid tank 5a in the wave direction WD, but the wave absorbing device 5h is not limited to both sides of the liquid tank 5a, but is also provided on the upper part of the liquid tank 5a. Of course, it is also possible to configure it so that it is provided on the entire surface or the entire side wall.

(g) 0 Effects of the Invention As explained above, according to the present invention, the flat wave water surface 5f is formed in a shape having the longitudinal direction WD in the wave direction.
The liquid tank 5a is provided with damping members such as a mesh 5c, a partition wall 5d, and a protrusion 5e for damping the vibration of the liquid.
Since the wave dissipating devices 5h and 5h are provided on the upper part of a,
Vibrations caused by wind or earthquakes in structures such as the super high-rise building 1 or the tower 6 can be effectively absorbed by the vibration of the liquid 5b in each damping device 5. In addition, since the structure does not have mechanically movable parts such as the liquid tank 5a and the liquid 5b, it has reliability over time compared to a mechanical vibration damping mechanism.
Moreover, maintenance and inspection can be easily performed. Furthermore, even if large-amplitude vibrations are applied to the liquid 5b in the tank and waves with high wave heights are generated by the wave-dissipating device 5h, the energy is effectively absorbed, so that disturbances do not occur in the period of the liquid 5b. High reliability.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a structure in which an embodiment of the damping device according to the present invention is used, Fig. 2 is a perspective view showing an example of the arrangement of the damping device, and Fig. 3 is a diagram showing an example of the arrangement of the damping device. 4 is a front sectional view of the damping device shown in FIG. 3, FIG. 5 is a plan view showing another embodiment of the damping device, and FIG. 6 is the allocation shown in FIG. 5. A front sectional view of the device, FIG. 7 is a plan view showing yet another embodiment of the vibration damping device, FIG. 8 is a front sectional view of the vibration damping device of FIG. FIG. 10 is a plan view of FIG. 9; FIG. 11 is a plan view of yet another arrangement of the allocation device; FIG. 12 is a plan view of yet another arrangement of the damping device. A plan view, FIG. 13 is a front view showing another example of a structure in which the damping device is used, FIG. 14 is a plan view showing yet another example of the arrangement of the damping device, and FIG. FIG. 16 is a plan view showing still another example of arrangement; FIG. 16 is a front sectional view showing still another example of the damping device. 1... Structure (super high I!J building) 5... Vibration damping device 5a... Liquid tank 5b... Liquid 5c... Damping member (mesh )5d・・・・・・
- Damping member (bulkhead) 5e... Damping member (protrusion) 5f... Wave water surface 5h... Wave dissipating device 6... Structure (tower) WD. ...Longitudinal Applicant Mitsui Construction Co., Ltd. Agent Patent Attorney Phase 1) Shinji (and 2 others) Figure 13 Figure 1 Figure 2 Figure 5 Figure 3 Figure 9 Figure 10 Figure 12 Figure 14

Claims (1)

[Claims] A vibration damping device installed on the top of a structure to absorb the vibrations of the structure, comprising a liquid injected water surface having a flat wave surface formed in a longitudinal direction in the wave direction. 1. A vibration damping device comprising: a liquid tank, a damping member for damping vibration of the liquid provided in the liquid tank, and a wave damping device provided above the liquid tank.