JPH0756192B2 - Structure damping wall structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a damping wall structure for a structure that suppresses vibration excited in a building / civil engineering structure due to an earthquake, wind, or the like. .

“Conventional technology and its problems” In recent years, construction and civil engineering structures have become larger and of various types due to factors such as the development of high-strength materials, the progress of machining technology, and the development of structural analysis technology using computers. In addition to being made lightweight and lightweight, it has a structure that is highly flexible against external forces. In such a lightweight and flexible structure, its natural frequency is low and its internal vibration damping tends to be small, so that various unexpected vibrations may occur due to the influence of external forces such as earthquakes and winds. Can occur. In particular, as described above, as the size of the structure increases, the amplitude of the vibration excited by the external force also increases, and this vibration gives an uncomfortable feeling to the person living inside the structure, and There was even a fear of applying a stress exceeding the permissible range to the frame.

Therefore, the inventor of the present application has filed Japanese Patent Application No. 60-241045
-101764), in the required position of the structure,
Vibration capable of suppressing the vibration of the structure due to the vibration of the liquid by providing a storage tank for storing a liquid vibrating in the same cycle as the unique vibration cycle of the structure and with a required phase difference A suppression device is proposed to solve the above problems.

One example of the vibration suppressing device shown in the above-mentioned specification has a structure in which a cylindrical storage tank is provided on the roof of a structure and liquid is stored in this storage tank. By the way, the effective mass of the liquid stored in this storage tank is preferably 1/50 to 1/100 of the mass of the structure in view of the balance between the vibration damping effect of the vibration suppressing device and the structural design of the structure. However, there is a problem to be solved in that the work of installing a vibration suppression device of such a scale on a structure becomes a large-scale work, and the installation place is limited to a place such as a rooftop that can secure a vast space. It was

"Means for Solving Problems" Therefore, in order to effectively solve the above problems, the present invention constitutes a plurality of storage chambers that constitute a wall of a structure and are arranged in parallel along the longitudinal direction and the vertical direction of the wall. A wall body having, and communicating with the inside of the storage chambers arranged in parallel in the inner longitudinal direction of the storage chamber by a communication passage, respectively, and inside the storage chamber, when the structure vibrates. A liquid that vibrates in the same natural vibration cycle as that of the structure is stored, and the storage chamber has a space above the liquid surface of the liquid in a stationary state to allow the vibration of the liquid.

[Operation] The liquid stored in each storage chamber of the wall body vibrates at the same natural vibration cycle as the natural vibration cycle of the structure and at a timing that is out of phase by a quarter cycle. Suppress the vibration of objects. Further, since the storage chambers arranged in the longitudinal direction of the wall are internally communicated with each other by the communication passage, the storage amount of the liquid stored in the plurality of storage chambers can be the same amount, and the water amount can be easily adjusted. it can.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Fig. 1 and Fig. 2 are views showing a structure of a damping wall of a structure which is an example of the present invention. In the drawings, reference numeral 1 is a wall body that constitutes a wall of a building or civil engineering structure (in the embodiment, a partition wall that partitions the internal space of the structure).
It is installed on the floor 3 between the pillars 2 of the structure.

This wall body 1 constitutes the main body of the damping wall, and has a support plate 5 whose upper end is supported by the ceiling 4 and lower end by the floor 3, respectively.
A plurality of shelf plates 6 extending horizontally on both sides of the support plate 5 and arranged in parallel in the vertical direction at intervals, and a plurality of storage chambers R mounted on these shelf plates 6 and performing a vibration suppressing action. It is composed of a box-shaped tank 7 and a liquid 8 stored in the tank 7 under the condition that the natural vibration period of the structure S is the same as the natural vibration period of the structure S. A space that allows vibration of the liquid 8 is provided above.

The tanks 7 are regularly stored in the shelves 6 to form storage chambers R arranged in parallel along the longitudinal direction and the vertical direction of the wall body 1. The interiors of the respective tanks 7 arranged in the above are communicated with each other by a communication passage 9. This allows the tank 7
The storage amount of the liquid 8 stored therein can be finely adjusted after the tank 7 is installed, and the storage amounts of the liquids 8, 8, ... In the respective tanks 7, 7 ,.

It is needless to say that the size of the communication passage 9 is set so that the vibrations of the liquid 8 generated in each tank 7 do not affect each other. Further, the inner surface of the side wall of the tank 7 is formed into an uneven surface, whereby the vibration damping ratio of the liquid 8 due to the increase in the frictional force between the liquid 8 and the inner surface of the tank 7 can be adjusted. Further, the tank 7 is
It is preferable that the liquid 8 is formed of a material that is not corroded even in long-term use (for example, plastic), and similarly, the liquid 8 is preferably a viscous liquid that hardly evaporates even in long-term use. However, the materials of the tank 7 and the liquid 8 may be appropriately determined depending on the construction conditions and the like, and are not limited to the above materials. Further, it is preferable to attach a scaled peep window 6 formed of a transparent material such as glass to one side surface of the tank 7 because it serves as a guide when the liquid is put therein.

In the illustrated example, the wall body 1 having the storage chambers R is installed between the columns 2; however, the number of the wall bodies 1 in the structure S is the storage chambers R, It goes without saying that the total mass of the liquids 8 in the ... Is set to be within the range of 1/50 to 1/100 of the mass of the structure S.

Next, the operation of the damping wall structure having the above configuration will be described.

The vibration system including the structure S and the wall 1 having the storage chamber R can be approximated and simplified to a vibration model as shown in FIG. This vibration model consists of a spring 10 with a spring constant K ₀ .
A vibration system A (a vibration model of the structure S) in which an object 12A having a mass M ₀ is supported via a dashpot 11A having A and a damping rate h ₀ , a spring 10B having a spring constant K ₁ and a damping rate h ₁ Is a model in which a vibration system B (a vibration model of the liquid 8 in the wall body _{1) in which} an object 12B having a mass M ₁ is supported is connected in series via the dashpot 11B.

Here, as described above, the wall 1 is composed of a plurality of storage chambers R, ... And the liquids 8 stored in these storage chambers R ,. Liquid 8
Since the natural vibration cycle of the liquid 8 and the natural vibration cycle of the structure S respectively match, the liquids 8 ...
Therefore, as described above, there is no problem even if the wall 1 is approximated by one vibration system B.

In such a vibration model, when the vibration system A starts to vibrate due to an external force such as an earthquake or wind applied to the object 12A, the vibration system B starts to vibrate with a phase delay of 1/4 cycle. By matching the vibration cycles of A and B, the vibration of the vibration system A can be suppressed.

Here, the object 12B has a mass of about 2% of that of the object 12A,
The natural vibration period T ₀ of the structure S is almost uniquely determined by the mass M ₀ and the spring constant K ₀ determined from the viewpoint of structural design. Therefore, the natural vibration period T ₁ of the liquid 8 stored in each storage chamber R is the natural vibration period T ₀ of the structure S.
The size and capacity of the tank 7 forming the storage chamber R and the storage amount of the liquid 8 may be set so that this,
The behavior of the liquid 8 stored in the tank 7 can be analyzed as follows.

The relationship between the jth natural frequency Tj of sloshing and the jth natural circular frequency ωj is expressed by the following equation.

Tj = 2π / ωj (1) Then, in the equation (1), H is the storage depth of the liquid,
If g is the gravitational acceleration, then ωj is the amount given by the following equation. Furthermore, kj in the equation (2) is 2a when the width of the tank 7 is 2a.
Then, it is given by the following equation.

kj = (2j-1) π / 2a (3) Therefore, the natural vibration period Tj of sloshing can be obtained from the above equations (1) to (3), and especially for suppressing the vibration described above. May use the natural vibration period in the first-order sloshing.

As described above, according to the damping wall structure of this embodiment,
Vibrations excited in the structure S due to an external force such as an earthquake or wind can be suppressed. Here, the wall body 1 that constitutes the main body of the damping wall has a configuration in which the liquids 8 are stored in a plurality of unitized tanks 7 and are placed on the shelf plate 6 of the support plate 5. Therefore, each work such as installation, movement, and removal of the wall body 1 can be easily performed, so that the construction work of the damping wall becomes very easy.

Further, the position of the wall 1 provided with the storage chamber R is not particularly limited, and the liquids 8 stored in these tanks 4, 4 ,.
The total mass of 8, ... Is 1/50 to 1/100 of the mass of the structure S.
Since it is only necessary to arrange the structure S in such a number as to fall within the range, it is possible to arrange with high flexibility, and the installation place is not limited. Therefore, according to this embodiment, it is possible to realize a structure for suppressing vibration of a structure in which work such as installation, movement, and removal is easy, and where the installation location is not selected.

Moreover, according to the embodiment, since the wall body 1 has a plurality of storage chambers R and the liquid 8 is stored therein,
It has an excellent soundproof effect as a partition wall in the structure S, and when the liquid 8 is composed of water or the like, there is an advantage that heat resistance and fireproof property can be improved.

The results of a simulation experiment conducted by the inventor of the present application will be shown below to verify the damping effect of the present invention. As an experimental system, as shown in FIG. 4, a five-layer model simulated structure S (mass M ₀ = 400 kg × 5 layers, primary natural period T)
It is an experimental system in which the wall 1 of the present invention (total mass of liquid 5, M ₁ = 52 kg, first-order natural period T ₁ = 0.41 seconds) is installed on the rooftop of ₀ = 0.41 seconds). Fig. 5 shows the displacement of the fourth layer of the simulated structure S when the random wave (EL-CENTRO-NS wave) is applied to such an experimental system without the wall 1 and the storage chamber R is provided. FIG. 6 shows the displacement of the fourth layer of the simulated structure S in the case where the wall body 1 is present. As can be seen from the illustrated results, it can be understood that the vibration suppressing device 1 suppresses the vibration of the simulated structure S.

Furthermore, as a result of the simulation, the total effective mass of the liquid
The ratio of M ₁ and the mass M ₀ of the structure S, is set to _{M 1 / M 0 = 1 /} 50~1 / 100 ...... (4), found that the effective vibration suppression effect is exhibited did. That is, the total effective mass M ₁ is the mass of the structure.
At 1/100 or less of M ₀ , sufficient damping effect cannot be obtained, and at 1/50 or more, the influence of the mass of liquid on the structural design of the structure becomes large, and the structural design In some cases, it is necessary to set the ratio as in the formula (4).

The structure of the damping wall of the structure according to the present invention is not limited to the structure in which the tank 7 is fitted at the site as in the above-mentioned embodiment. As an example, for example, the wall body 1 may have an integral unit structure in which a storage chamber R is formed in which the inside is divided into horizontal and vertical cross sections by partition plates or the like.

Further, the shape of the tank 7 may be changed to various shapes such as a cylindrical shape and a plane elliptical shape depending on the shape of the structure S and the installation conditions. In this case, the theory may be appropriately changed, and the dimensions of the tank, the storage depth of the liquid, and the like may be set based on the formula corresponding to the shape. Further, a vibration damping rate due to viscous resistance can be adjusted by appropriately arranging a partition plate or the like in the tank 7 to have a wave-dissipating effect, or by making the liquid a viscous liquid. When the tank 7 is made of a steel plate, the durability of the tank 7 itself can be increased by mixing a rust preventive agent in the liquid 8.

"Effects of the Invention" As described in detail above, the damping wall structure for a structure according to the present invention constitutes a wall of the structure and has a plurality of storages arranged in parallel along the longitudinal direction and the vertical direction of the wall. A wall having a chamber is formed, and the insides of the storage chambers arranged in parallel in the inner longitudinal direction of the storage chamber communicate with each other by communication passages, and have the same natural vibration period of the structure inside the storage chamber. Since the liquid that vibrates with the natural vibration period of (3) and with a required phase difference from the natural vibration of the structure is stored, the following various excellent effects are exhibited.

Vibration having a required phase difference with respect to the vibration of the structure is generated in the liquid in the storage chamber to suppress the vibration of the building, and it is possible to obtain an effect of suppressing the vibration of the structure against earthquakes or wind.

Since the wall body exhibiting the vibration suppressing effect as described above can be utilized as a partition wall of the structure, etc., the installation location in the structure is not limited as compared with the conventional one using the storage tank. In addition, since the storage chambers that are lined up in the longitudinal direction of the wall that facilitate installation, movement, removal, etc., communicate with each other through communication channels, the same amount of liquid stored in multiple storage chambers can be used. Since the amount of water can be adjusted and the amount of water can be easily adjusted, the workability is not impaired.

[Brief description of drawings]

1 and 2 show a damping wall structure which is an embodiment of the present invention. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a front view, and FIG. 3 is a structure and damping. FIG. 4 is a schematic diagram showing a vibration model of a wall structure, FIG. 4 is a schematic diagram showing an outline of an experimental system of a simulation experiment, and FIG. 5 is a simulated structure without a damping wall structure according to an embodiment of the present invention. And FIG. 6 is a diagram showing the vibration state of the simulated structure provided with the damping wall structure. S: structure, R: storage chamber, 1 ... wall, 2 ... pillar,
3 ... Floor, 4 ... Ceiling, 5 ... Support plate, 6 ... Shelf plate, 7
... tank, 8 ... liquid, 9 ... communication passage.

Claims (1)

[Claims] 1. A wall comprising a wall of a structure and having a plurality of storage chambers arranged in parallel along the longitudinal direction and the up-down direction of the wall, and arranged in parallel in the inner longitudinal direction of the storage chamber. The storage chambers are internally communicated with each other by communication passages, and further, inside the storage chamber, there is liquid that vibrates at the same natural vibration cycle as the natural vibration cycle of the structure when the structure vibrates. A damping wall structure for a structure, wherein the damping chamber is stored, and the storage chamber has a space above the liquid surface of the liquid in a stationary state to allow vibration of the liquid.