JP2003176641A - Building damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building camper having natural frequency coinciding with target value in high degree of accuracy. <P>SOLUTION: A base 6 is formed in a longer shape having a required longitudinal length having brackets 6a erected on both ends in the longitudinal direction. Plates 7 having the surface horizontally disposed are set on the base 6. Metal- made sliders 9 contacted to the plates 7 in a slidable manner are mounted on the bottom of a weight 8. A tensile coil spring 10 is erected between one end of the weight 8 and each of the brackets 6a. The slider 9 is rigidly fixed to the weight 8, and since the slider 9 itself comprises a rigid body, the natural frequency of the weight depends only on weight of the weight 8 and spring constant of the spring 10. Accordingly, the natural frequency can be set in the same value as that of the target value in high degree of accuracy by selecting those values. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building vibration damping device, and more particularly to a building vibration damping device preferably used for damping vibrations due to earthquakes, winds, traffic vibrations, and the like of houses.

[0002]

2. Description of the Related Art As a conventional building vibration damping device of this type,
There is one shown in FIG. In the building vibration damping device of FIG. 2, the base brackets 2 are attached to both ends of the long plate-shaped weight 1.
Is arranged so that the weight 1 can reciprocate in the longitudinal direction of the weight with respect to each base bracket 2, and the horizontal piece 1 of both
The laminated rubber 3 and the damping material 4 are interposed between a and 2a to hold the weight 1 so as to be horizontally movable, and
A tension coil spring 5 is interposed between the base brackets 2 and 2. The coil springs 5 are arranged at both ends of the weight 1 and apply a tensile force to the weight 1 in a direction to return to the neutral position when the weight 1 is displaced in the longitudinal direction. Since the coil spring 5 is provided in addition to the laminated rubber 4 and the damping material 3, the horizontal natural frequency of the weight can be adjusted.

[0003]

In the above conventional building vibration damping device, the weight 1 is supported by the laminated rubber 4. The laminated rubber 4 is formed by laminating a metal plate and a rubber layer and vulcanizing and adhering them.

This laminated rubber allows the horizontal movement of the weight 1 by utilizing the viscoelasticity of the rubber, but the natural frequency of the weight 1 tends to vary due to the variation in the viscoelasticity characteristics of the rubber.

The present invention makes it possible to provide a building vibration damping device having a natural frequency that matches a target value with high accuracy.

[0006]

SUMMARY OF THE INVENTION In a building vibration damping device of the present invention, a support member is provided on a base to support a weight so that the weight can be displaced in a horizontal direction, and a spring for urging the weight toward a neutral position is provided. In the building vibration damping device, the support member includes a flat plate having a horizontal surface, and a slider slidably in contact with the horizontal surface of the flat plate.

In such a building vibration damping device, since the weight is supported by the base through the flat plate and the slider slidably in contact with the horizontal plane of the flat plate, the flat plate and the slider are supported. It is possible to adjust the natural frequency of the weight in any way by selecting the friction coefficient of, and it is possible to obtain a building vibration damping device with a weight that matches the target natural frequency with high accuracy. it can.

The slider is preferably rigidly attached to the weight or the base. this is,
This is to prevent variation in the natural frequency of the weight due to the presence of rubber or the like between the slider and the weight or the base. Further, for the same reason, it is preferable that the slider is made of only a rigid body.

In the present invention, the coefficient of dynamic friction between the slider and the flat plate is preferably 0.01 to 0.1, more preferably 0.02 to 0.08.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Embodiments will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a building vibration damping device according to an embodiment.

The base 6 has a long shape having a required length in the longitudinal direction in which brackets 6a are erected at both ends in the longitudinal direction. A flat plate 7 whose upper surface is a horizontal surface is installed on the base 6.

On the bottom surface of the weight 8, a slider 9 made of metal or hard synthetic resin is slidably in contact with the flat plate 7. Both ends of the weight 8 and each bracket 6
A tension coil spring 10 is laid between a and a.

The coefficient of dynamic friction between the slider 9 and the flat plate 7 is 0.01 to 0.1, preferably 0.02 to 0.08. In the building vibration damping device configured as described above, when vibration such as an earthquake is applied, the weight 8 moves in a direction opposite to the shaking direction of the building and suppresses the building vibration. When the weight 8 vibrates, the slider 9 moves to the flat plate 7
Slide on. The natural frequency of the weight 1 is determined by the weight of the weight 8 and the spring constant of the spring 10. That is,
Since the slider 9 is rigidly fixed to the weight 8 and the slider 9 itself is also a rigid body, the natural frequency of this weight is determined only by the weight of the weight 8 and the spring constant of the spring 10. Therefore, by selecting these values, the natural frequency of the weight 8 can be set to the target value with high accuracy. This makes it possible to sufficiently reduce the vibration of the building. The damping characteristic of the building vibration damping device can be set to a target value by selecting the coefficient of friction between the slider 9 and the flat plate 7.

Although the slider 9 is attached to the weight 8 in the embodiment of FIG. 1, the slider 9 may be attached to the base 6 and the flat plate 7 may be attached to the weight as in the embodiment of FIG. The slider 9 is rigidly fixed to the base 6.

In the above embodiment, the weight 8 vibrates only in the longitudinal direction of the base 6, and only the longitudinal vibration of the base 6 is suppressed. In order to suppress the vibration of the building in both X and Y directions (two horizontal orthogonal directions), the building vibration damping device of FIG. 1 may be arranged in the X and Y directions, respectively.

A building vibration damping device capable of damping vibrations in all directions will be described below with reference to FIGS.

This building vibration damping device 80 has a base 12
A top plate 14 disposed on the upper side of the base 12 in parallel with and facing the base 12, and the top plate 14
A weight 20 fixed by a bolt 16 is provided on the top. The hanging fitting 18 is screwed to the weight 20.

The building vibration damping device 80 is further arranged between the top plate 14 and the base 12 to support the top plate 14 and the slider 30 and the flat plate 34.
And a coil spring 50 for urging the weight 20 to return to the neutral position in the horizontal direction.

In this embodiment, the top plate 14 and the weight 20 are square. A pair of side brackets 52 is laterally projected from each of the four sides of the top plate 14, and a center bracket 54 is arranged at an intermediate position between the pair of side brackets 52, 52. The center bracket 54 is fixed to the base 12 with bolts 56.

Two hook bolts 58 are attached to each side bracket 52 by nuts 60,
The coil spring 50 is bridged between each hook bolt 58 and the center bracket 54.

The slider 30 includes the top plate 14
Is attached via a mounting seat 32. The flat plate 34 is fixed to the base 12 by bolts or the like.

Although not shown, a stopper mechanism for preventing the excessive displacement of the weight 20 may be provided.

The building vibration damping device 80 constructed in this way
Is fixedly installed by bolts on a horizontal angle 72 erected between beams 70 of a building, for example. Since the weight 20 of the building vibration damping device is in the form of a board and the device height of the building vibration damping device is low, the building vibration damping device can be installed in a space above the ceiling where the height is small.

When vibration such as traffic vibration, wind, or shaking due to an earthquake is applied to this building, the weight 20 vibrates relatively to the base 12 in the opposite direction to the vibration,
Thereby, the vibration of the building can be reduced.

In this embodiment, the weight 20
Is displaceable in all directions in the horizontal direction, and the coil springs 50 are arranged in two orthogonal directions of the horizontal X direction (horizontal direction in FIG. 4A) and the horizontal Y direction (vertical direction in FIG. 4A). Therefore, it is possible to damp the horizontal omnidirectional vibration generated in the building.

Also in this case, the weight of the weight 20 is selected by selecting the spring constant of the coil spring 50 and the weight of the weight 20.
The natural frequency of can be adjusted. Also, the natural frequencies in the X and Y directions can be adjusted separately.
For example, when the building vibration damping device is installed in a building having a rectangular shape in a plan view, the natural frequency in the longitudinal direction of the rectangle can be set higher than the natural frequency in the lateral direction.

When the building vibration damping device of the present invention is installed in a building, the weight of the weight 20 is less than the weight of the building.
It is preferably about 5 to 2%. If the weight weight is less than 0.5% of the building weight, the vibration damping effect is poor, and if it exceeds 2%, the weight is too heavy, and the installation of the building vibration damping device is likely to be hindered.

The weight 20 shown in the drawing has a rectangular shape in a plan view, but may have a circular shape, an elliptical shape, a polygonal shape or the like.

[0029]

As described above, the building vibration damping device of the present invention can accurately set the natural frequency as the target.

[Brief description of drawings]

FIG. 1 is a side view of a building vibration damping device according to an embodiment.

FIG. 2 is a perspective view of a building vibration damping device according to a conventional example.

FIG. 3 is a perspective view of a building vibration damping device according to another embodiment.

4A is a plan view of the building vibration damping device according to the embodiment of FIG. 3, and FIG. 4B is a side view thereof.

FIG. 5 is a side view of a building vibration damping device according to yet another embodiment.

[Explanation of symbols] 6 base 7 flat plate 8 weights 9 slider 10 coil spring 12 base 14 Top plate 20 weights 30 slider 34 flat plate 50 coil spring 52 Side bracket 54 Center bracket

Claims (8)

[Claims] 1. A building vibration damping device in which a weight is horizontally displaceably supported by a supporting member with respect to a base, and a spring is provided to urge the weight toward a neutral position, wherein the supporting member is a horizontal surface. And a slider that slidably contacts the horizontal surface of the flat plate. 2. The building vibration damping device according to claim 1, wherein the slider is attached to the weight. 3. The building vibration damping device according to claim 2, wherein the slider is rigidly attached to the weight. 4. The building vibration damping device according to claim 1, wherein the slider is attached to the base. 5. The building vibration damping device according to claim 4, wherein the slider is rigidly attached to the base. 6. The building vibration damping device according to claim 3 or 5, wherein the slider is made of a rigid body only. 7. The coefficient of dynamic friction between the flat plate and the slider according to claim 1, which is 0.01 to
A building vibration damping device characterized by being 0.1. 8. The building vibration damping device according to claim 1, wherein the spring is a coil spring and is horizontally installed.