JPH11336830A - Vibration damping device for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device of building which can damp the vibration to all the bearings in the horizontal direction. SOLUTION: This vibration damping device 10 for a building is provided with a base 12, a top plate 14 provided opposing parallel to the base 12; and a weight 20 fixed on the top plate 14 by bolts 16, and furthermore, provided with a laminated rubber set between the top plate 14 and the base 12, and supporting the top plate 14, a vibration attenuation member provided between the top plate 14 and the base 12, and jointed to both members, and coil springs 50 to regulate the peculiar vibration number of the weight 50 in the horizontal direction. The coil springs 50 are provided in two directions of the horizontal X-direction and the horizontal Y-direction.

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 suitably used for damping traffic vibrations of houses, vibrations caused by earthquakes, winds, and the like.

[0002]

2. Description of the Related Art As a conventional vibration damping device of this kind,
There is one described in JP-A-8-128229. In the building vibration damping device of the same publication, a base bracket is arranged at both ends of a long plate-shaped weight, and the weight can be reciprocated in the longitudinal direction of the weight with respect to each base bracket. , A damping material and a tension coil spring. The coil springs are disposed at both ends of the weight, and apply a tensile force to the weight in a direction of returning to the neutral position when the weight is displaced in the longitudinal direction. By providing this coil spring, the horizontal natural frequency of the weight can be adjusted.

[0003]

The above-mentioned conventional vibration damping device for a building can control the vibration in the longitudinal direction of the weight, but cannot control the vibration in the direction perpendicular to this.

An object of the present invention is to provide a building damping device capable of damping vibration in all directions in the horizontal direction.

[0005]

The building vibration damping device of the present invention supports a weight so as to be displaceable in a horizontal direction with respect to a base via a laminated rubber and a vibration damping material, and directs the weight toward a neutral position. In a building vibration damping device provided with a biasing spring, a first spring for displacing the weight in two orthogonal directions, X direction and Y direction, and for biasing the weight in the X direction as the spring is provided. And a second spring for biasing the weight in the Y direction.

According to such a building vibration damping device, vibrations in the X direction and the Y direction can be damped, and thus vibrations in all horizontal directions combined with the X direction and the Y direction can be damped.

In the present invention, the base is preferably plate-shaped, and the weight is preferably formed of a disk-shaped body disposed above the base. In this case, it is preferable that the weight has a rectangular shape having four sides, and a coil spring is arranged as the spring along each side of the weight.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a building damping device according to an embodiment, FIG. 2 (a) is a plan view of the building damping device, and FIG. 2 (b) is a side view.

The building vibration damping device 10 includes a base 12
A top plate 14 disposed on the upper side of the base 12 so as to face the base 12 in parallel with the base 12;
It has a weight 20 fixed thereon by bolts 16. The hanging fitting 18 is screwed to the weight 20.

The building vibration damping device 10 further includes a laminated rubber 30 disposed between the top plate 14 and the base 12 and supporting the top plate 14, and a gap between the top plate 14 and the base 12. And a coil spring 50 for adjusting the horizontal natural frequency of the weight 20 and the like.

In this embodiment, the top plate 14 and the weight 20 are rectangular. A pair of side brackets 52 protrude laterally from each of the four sides of the top plate 14, and a center bracket 54 is disposed at an intermediate position between the pair of side brackets 52, 52. The center bracket 54 is fixed to the base 12 by 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 laminated rubber 30 is provided on the top plate 14.
An upper flange 32 fixed to the base 12 by a bolt, a lower flange 34 fixed to the base 12, and a laminate 36 of a plurality of rubber layers and an iron plate layer interposed between the flanges 32 and 34. The laminated rubber 30 supports the load of the weight 20 and the top plate 14. The rubber layer of this laminate deforms horizontally when horizontal stress is applied, and the weight 20 and the top plate 1
4 allow horizontal displacement (vibration).

The vibration damping member 40 is provided on the top plate 1.
The upper surface and the lower surface are fixed to the top plate 14 and the base 12 by bonding or the like.

As the vibration damping material 40, a gel material having low rigidity and high damping is preferable. With this gel-like vibration damping material, there is no risk of liquid leakage as in a liquid damper. This vibration damping material has a damping amount of 5 to 20%.
Are preferred. If the amount of attenuation is less than 5%, the damping effect will be poor, and if it exceeds 20%, the weight 20 will be difficult to move, and the damping effect will also be poor.

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

The thus constructed building vibration damping device 10
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 damping device has a board shape and the height of the building damping device is low, the building damping device can be installed in a space above the ceiling where the height is small.

When vibrations such as traffic vibrations, wind, and shaking due to an earthquake act on the building, the weights 20 vibrate relative to the base 12 in a direction opposite to the vibrations.
Thereby, the vibration of the building can be reduced.

In this embodiment, the weight 20
Can be displaced in all directions in the horizontal direction, and the coil springs 50 are arranged in two orthogonal directions of the horizontal X direction (the left-right direction in FIG. 2A) and the horizontal Y direction (the vertical direction in FIG. 2A). Therefore, it is possible to attenuate horizontal omnidirectional vibration generated in the building.

In this case, the natural frequency of the weight 20 can be adjusted by changing the coil spring 50 to one having a different spring constant or changing the number of coil springs 50. Also, the natural frequencies in the X and Y directions can be adjusted separately. For example, when this building damping device is installed in a building having a rectangular shape in plan view, the natural frequency in the longitudinal direction of the rectangle can be made higher than the natural frequency in the short direction.

When the building vibration damping device of the present invention is installed on a building, the weight of the weight 20 is set to 0.
It is preferable to set it to about 5 to 2%. If the weight is less than 0.5% of the building weight, the vibration damping effect is poor, and if it exceeds 2%, the weight becomes too heavy, and the installation of the building vibration damping device is likely to be hindered.

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

[0023]

As described above, the building vibration damping device of the present invention can attenuate vibrations in all horizontal directions. In addition, the natural frequency can be adjusted in each direction.

[Brief description of the drawings]

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

FIG. 2 is a plan view and a side view of the building vibration damping device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Building damping device 12 Base 14 Top plate 20 Weight 30 Laminated rubber 40 Vibration damping material 50 Coil spring 52 Side bracket 54 Center bracket

Claims (3)

[Claims] 1. A building vibration damping device provided with a spring that supports a weight in a horizontal direction with respect to a base via a laminated rubber and a vibration damping material, and biases the weight toward a neutral position. A first spring that urges the weight in the X direction and a second spring that urges the weight in the Y direction as the spring; A building damping device comprising a spring. 2. The building vibration damping device according to claim 1, wherein the base is plate-shaped, and the weight is a plate-shaped body disposed above the base. 3. The building vibration damping device according to claim 2, wherein the weight is a rectangle having four sides, and a coil spring is arranged as the spring along each side of the weight.