JPH08326837A - Vibration suppressing device and structure - Google Patents

Abstract

PURPOSE: To restrain large vibration of a structure such as a building or civil structure and to rapidly damp generated vibration by reserving a material having a thixotropic characteristic in a container attached to the structure. CONSTITUTION: A vibration suppressing device 50 installed in the upper part of a structure has a container 2 which is sealed by a cover 3, and in which a thixotropic material is reserved. In such a case that the structure 10 to which horizontal impact vibrating force is exerted, is to start vibration, the material 5 in the container 2 is subjected to a shearing load due to an inertia force acting upon the material 5 so as to effect a thixotropic phenomenon, and accordingly, it changes from a gel phase into a zol phase. Accordingly, the vibration energy of the structure is consumed, and accordingly, the generated vibration is rapidly damped. The material 5 having changed into the zol phase, returns into the gel phase when the vibration is completely or substantially stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device used in buildings, civil engineering structures and the like, and a structure using the vibration damping device.

[0002]

2. Description of the Related Art Buildings and civil engineering structures generate vibrations due to earthquakes, wind, traffic vibrations, and the like. In particular, when an earthquake or a gust is received, it may be greatly excited in a form close to an impact. The vibrations excited by this need to be quickly attenuated, but the internal damping of the structure itself tends to become smaller with the recent weight reduction of the structure. Therefore, a large vibration is excited, and the excited vibration may not be attenuated promptly, which not only causes discomfort and anxiety to humans living in the structure, but also increases the allowable value for the structure. There was a risk of generating exceeding stress.

In order to solve the above-mentioned problems, a vibration damping device is known in which a storage tank for storing a liquid is provided in a structure and the vibration of the structure is suppressed by the vibration of the liquid. Examples of such inventions include JP-A-62-82182 and JP-A-5-149026.

[0004]

However, in the above-described damping device using liquid, there is a limit to the damping force to be applied,
There is a risk that the vibration cannot be sufficiently suppressed, especially for a shocking exciting force.

An object of the present invention is to provide a vibration damping device mainly used for buildings, civil engineering structures, etc., which is capable of adding a large amount of damping especially to a shocking exciting force.

Another object of the present invention is to provide a structure in which large vibrations are not particularly generated due to a shocking excitation force and the generated vibrations are promptly damped.

[0007]

[Means for Solving the Problems] By the way, a certain colloidal solution is in a gel state which normally does not show fluidity, but becomes a sol state which shows fluidity due to vibration, stirring, load or deformation. Then, the phenomenon in which the sol state changes to the gel state again by being left is shown. It is known that this phenomenon is called a thixotropy phenomenon, and a characteristic exhibiting the thixotropy phenomenon is called a thixotropy characteristic. Hereinafter, a substance having thixotropic properties is referred to as a thixotropic substance.

In order to solve the above problems, the vibration damping device of the present invention has a container attached to or attachable to a structure, and a thixotropic substance stored in the container.

Further, the structure of the present invention comprises a container attached to or attachable to the structure, and a vibration damping device having a structure in which a thixotropic substance is stored in the container. It is arranged at the position that

[0010]

When the vibration damping device having the above structure is attached to a structure and a large impact vibration force is applied to the structure, the thixotropic substance undergoes a phase transition from gel to sol, at which time the structure changes. The vibration energy of the object is consumed, and as a result, the structure does not vibrate significantly and the generated vibration is promptly damped. After the movement is stopped, the thixotropic substance undergoes a phase transition from sol to gel again, so that even if the impact vibration force is repeatedly applied to the structure, the vibration can be damped by the above action.

Further, in the structure of the present invention, due to the above-mentioned action of the attached damping element, a large vibration is not generated even when a shocking vibration force is applied, and the generated vibration is prompt. Decays to.

[0012]

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial vertical sectional view of a vibration damping device of the present invention. The vibration damping device 50 includes a container 2, a lid 3 of the container 2, and a thixotropic substance 5 stored in the container 2.
Further, the thixotropic substance 5 does not completely fill the inner cavity of the container 2, but has a filling amount with a space above it.

FIG. 2 shows an example of the structure of the present invention. The structure 10 has a structure in which the vibration damping device 50 shown in FIG.

The behavior of the vibration damping device 50 and the structure 10 when a shocking vibration force is applied to the structure 10 will be described. When a shocking horizontal vibration force is applied to the structure 10, the structure 10 starts to vibrate. At this time, due to the structural characteristics of the structure 10, the uppermost portion 11 becomes an antinode of vibration. Then, the vibration damping device 50 moves to the uppermost portion 11 of the structure 10.
Try to vibrate as well. At this time, an inertial force acts on the thixotropic substance 5 inside the damping element 50, and the thixotropic substance 5 does not completely fill the inner space of the container 2, so that the thixotropic substance 5 moves into the container 2. Being unrestrained, the thixotropic substance 5 does not completely follow the movement of the container 2. Therefore, the thixotropic substance 5 is subjected to a large shear load on the portion in contact with the wall surface of the container 2, and a thixotropic phenomenon occurs to change the phase from gel to sol. At this time, the vibration energy of the structure is consumed, so that the vibration of the structure 10 does not increase and the generated vibration is quickly attenuated. Further, the thixotropic substance 5 that has changed its phase from gel to sol changes its phase again from sol to gel after the vibration is stopped or becomes sufficiently small. Therefore, the above effect is produced even when a shocking vibration force is applied again.

The thixotropic substance 5 is a gel of aluminum hydroxide, a suspension of bentonite or the like,
It is possible to use a paint in which pigment particles are dispersed in a drying oil, a grease in which aluminum is dispersed in a lubricating oil, a castor oil derivative and a low molecular weight polyethylene derivative.

FIG. 3 shows another embodiment of the vibration damping device of the present invention. The vibration damping device 51 includes the container 2, the lid 3 of the container 2, and the container 2
It is composed of a thixotropic substance 5 stored in the container, and a mesh-shaped rigid cut-off member 20 arranged substantially at the center of the bottom surface of the container 2. According to the vibration damping device having this configuration, when the vibration damping element 51 is about to vibrate, the thixotropic substance 5 receives a shear load not only from the side surface of the container 2 but also from the threshold member 20. It is possible to promote a phase change from sol to sol. At the same time, the thixotropic substance 5 phase-changed by the threshold member 20.
Generates flow resistance when passing through the dividing member 20. Due to these actions, there is a greater damping effect than the vibration damping device 50 of the embodiment shown in FIG.

The dividing member 20 is not limited to a mesh-like member, and may be any member having at least one through hole. Moreover, the damping effect can be further improved by providing a plurality of threshold members.

FIG. 4 shows another embodiment of the vibration damping device of the present invention. The vibration damping device 52 of this embodiment has a structure in which it is divided into two upper and lower parts by a horizontal meshing member 21. When the vibration damping device having this structure is attached to a structure, the following effects can be expected. When the vibration damping device 52 vibrates in the horizontal direction, the thixotropic substance 5 does not completely follow the movement of the container 2 as in the vibration damping device 50 of the embodiment shown in FIG. At this time, the thixotropic substance 5 causes a so-called sloshing phenomenon, and vibrates not only in the horizontal direction but also in the vertical direction. Therefore, the thixotropic substance 5 in the vibration damping device 1 shown in FIG. 4 is urged to undergo a phase change from gel to sol by the horizontal threshold member 21. Further, when the thixotropic substance 5 passes through the horizontal dividing member 21, a large flow resistance is generated. With these, the vibration control device 5
2 produces a large damping effect. Further, since the vibration of the thixotropic substance 5 in the vertical direction occurs regardless of the vibration of the vibration damping device 52, there is a damping effect on the vibration in all directions.

The horizontal dividing member 21 is not limited to a mesh-like member, but may be any member having at least one through hole. Moreover, the damping effect can be further improved by providing a plurality of horizontal dividing members.

FIG. 5 shows another embodiment of the vibration damping device of the present invention. The vibration damping device 53 of this embodiment includes a cylindrical container 8 and
It is composed of a lid 9 of the container 8, a mesh-shaped cylindrical squeezing member 22 attached to substantially the center of the bottom surface of the container 8, and the thixotropic substance 5 stored in the container 2. According to the vibration damping device 53 having this configuration, the vibration damping device 51 shown in FIG.
The same damping effect as is obtained. Further, since the vibration damping device 53 has a cylindrical shape, and the cylindrical cut-off member 22 is also cylindrical and is arranged substantially at the center of the container 2,
It is possible to generate almost equal damping effects on vibrations in all directions without anisotropy.

The cylindrical dividing member 22 is not limited to the mesh-like member, but may be any member having at least one through hole. However, when the arrangement of the through holes is not symmetrical with respect to the center of the cylinder, the damping effect is anisotropic. Further, the damping effect can be further improved by forming the cylindrical partition member in a multiple structure.

The vibration damping devices 50 to 53 described above are
By setting the natural frequency of the thixotropic substance 5 to be equal to the natural frequency of the structure, it is possible to generate the effect as a normal dynamic vibration absorber. Thixotropic substance 5
The natural frequency of the thixotropic substance 5, the storage amount of the thixotropic substance 5, the shape of the container 2, the threshold member 2
It is possible to adjust by setting the shape of 0 to 22 appropriately.

[0023]

According to the present invention, the thixotropic substance stored in the vibration damping device undergoes a phase change from gel to sol to consume the vibration energy of the structure, so that a particularly vibrating force is exerted. It is possible to provide a vibration damping device capable of adding a large damping to the.

Further, according to the present invention, a structure in which the vibration damping device attached to the structure absorbs the vibration energy of the structure to suppress the vibration particularly against a shocking vibration force is provided. Can be provided.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a vibration damping device of the present invention.

FIG. 2 is a front view showing an embodiment of the structure of the present invention.

FIG. 3 is a partial sectional view showing a second embodiment of the present invention.

FIG. 4 is a partial sectional view showing a third embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

2, 8 ... Container, 3, 9 ... Lid, 5 ... Substance having thixotropic property, 10 ... Structure, 20 ... Edge member, 21 ... Horizontal edge member, 22 ... Cylindrical edge member, 50-53 ...
Vibration control device.

Claims (5)

[Claims] 1. A vibration damping device comprising a container attached to or attachable to a structure, and a substance having thixotropic properties stored in the container. 2. A container attached to or attachable to a structure, a substance having thixotropic properties stored in the container, and a bottom surface of the cavity inside the container, which is attached so as to divide the cavity. A damping device having at least one through hole, the damping device having at least one through hole. 3. A container attached to or attachable to a structure, a substance having thixotropic properties stored in the container, and attached to the container so as to horizontally divide a space inside the container. A vibration damping device comprising at least one through hole, which is provided with at least one through hole. 4. A cylindrical container attached to or attachable to a structure, a substance having thixotropic properties stored in the container, and a cylindrical container attached to the bottom of a cavity inside the container. A vibration damping device, comprising: a cutout member, wherein the cutout member has at least one through hole. 5. A structure in which the vibration damping device according to claim 1, 2, 3 or 4 is attached to a portion serving as an antinode of generated vibration.