JPH02104872A - Resistance plate in viscous substance damper - Google Patents

Abstract

PURPOSE:To reduce the whole area of a damper of a viscous damping device, made by immersing resistance plates in viscous liquid, by placing a plurality of circular resistance plates in a row and by making the plates enclosed with straight lines at least at both sides of its longitudinal direction. CONSTITUTION:Viscous liquid 3 is stored in a plate-shaped base board 2 fixed to a foundation member 1, and a resistance plate body 7, fixed through supporting legs 6 to a supporting board 5 of a base member 4 of a building, is immersed in the liquid 3. The resistance plate body 7 is formed in rectangle 9 or the like with a plurality of circular resistance plates placed lengthwise in a row and both lengthwise sides 8 are enclosed with straight lines. Such device is made smaller in the whole area of the resistance plate body 7 as compared to the conventional devices formed of a plurality of viscous substance dampers, but the damping function comparable to the conventional devices can be obtainable. Therefore, a viscous substance damper smaller in the whole area can be made available for use at a heavyweight structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resistance plate in a viscous damper that reduces seismic input to a structure due to an earthquake.

[Conventional technology]

Conventionally, there are various types of seismic isolation devices, one of which is a viscous damper. This viscous damper has the same structure as the present invention except for the shape of the resistance plate, so it will be explained with reference to FIG. Then, a circular resistance plate 7a (see FIG. 6) is attached to the support plate 5 of the base 4 of the structure with support legs 6, and this resistance plate 7a is immersed in the viscous fluid 3 to reduce the shear resistance of the viscous fluid 3. There is a known viscous damper that reduces the earthquake equivalent amount (hereinafter referred to as a viscous damper).

[The problem that the invention attempts to solve I! ! ] The resistance plates of the conventional seismic isolation devices are usually circular, but some large structures can weigh more than 200,000 tons. Damping force is required, and the area of the resistance plate is also required to be larger, but the diameter of the resistance plate is limited due to construction reasons, so it is necessary to use a large number of viscous dampers. , it becomes impossible to place the viscous damper properly at the bottom of the foundation beam or floor slab, and when viscous dampers are placed, the number of viscous dampers increases significantly, making it difficult to install them, and it is difficult to find the appropriate location. There was a problem in that it was not possible to properly manage post-earthquake inspections because the equipment could not be placed in the area.

This invention aims to solve these problems.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a viscous damper in which a resistance plate 7 is immersed in a viscous fluid 3 stored on a bottom plate 2 so that the resistance plate 7 receives shear resistance from the viscous fluid 3. The resistive plate 7 has a rectangular or L-shaped shape in which a plurality of circular resistive plates 7a are arranged in a straight line and at least both sides 8 in the parallel direction are surrounded by straight lines.

[Effect] The operation of this invention will be explained with reference to embodiments.

When the structure vibrates due to an earthquake, horizontal displacement occurs, and the viscous fluid 3 produces shear resistance against the resistance plate 7 attached from the support plate 5 of the structure's base 4 with the support legs 6, reducing the amount of seismic response to the structure. It attenuates the

The viscous damper has a shape in which a plurality of circular resistance plates 7a are arranged and both sides 8 in the parallel direction are surrounded by straight lines,
In addition, since the bottom plate 2 has a viscous fluid 3 occupying surface 3a with a width approximately equal to the horizontal displacement of the structure around the resistance plate 7, there are Unlike the case where the surface 3b occupied by the viscous fluid 3 is arranged concentrically, the area of the resistor plate 7 is smaller than that of a conventional viscous damper in which a plurality of viscous dampers are arranged. Even if the area is increased several times that of the conventional viscous damper, the area of the entire viscous damper can be made much smaller than the area of a plurality of conventional viscous dampers. Therefore, the viscous damper of the present invention can obtain the same damping effect even if its area is smaller than that of a plurality of conventional viscous dampers having circular resistance plates 7a.

〔Example〕

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows a viscous damper of the present invention, in which a dish-shaped bottom plate 2 is fixed on a base l, a viscous fluid 3 is stored in the bottom plate 2, and a supporting plate 5 of the base 4 of the structure is fixed. A resistance plate 7 is attached to the support leg 6, and the resistance plate 7 is immersed in a viscous fluid 3.

In this case, the resistance plate 7 is made by arranging a plurality of circular resistance plates 7a (see Fig. 2), which have been commonly used in the past, in a straight line, as shown in Figs. A rectangle 9 surrounded by straight lines (see Figure 2), a rectangle with semicircles 10 at both ends (see Figure 3), an L-shape 11 arranged in a piece shape and surrounded by straight lines on both sides 8 (see Figure 4) , a U-shape 12 (see FIG. 5), which is arranged in a U-shape and surrounded by straight lines on both sides 8;

When the viscous damper having the rectangular resistance plates 7 is arranged on the base part 1, the viscous damper is arranged so that the resistance plates 7 are orthogonal to each other.

Further, the damping force required for the structure is adjusted by adjusting the area of the resistance plate 7, and the area of the resistance plate 7 is adjusted by its length.

In addition, for the resistance plate 7 of the above-mentioned shape, the bottom plate 2 storing the viscous fluid 3 has a size that allows the displacement of the resistance plate 7 and has a similar shape to the resistance plate 7.

〔Effect of the invention〕

This invention allows the total area of the viscous damper to be smaller than conventional ones, so it can be appropriately placed even in heavy structures, and the number of viscous dampers used can be reduced, making it easier to install. In addition to making it easier to carry out inspections after an earthquake, it is also easier to conduct inspections after an earthquake, allowing for better management.

Furthermore, since the area occupied by the viscous fluid can be reduced, the amount of expensive viscous fluid can be significantly reduced.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view, FIGS. 2 to 5 are plan views of the resistance plate, viscous fluid, and bottom plate, respectively, and FIG. The figure is a plan view of a conventional resistance plate, viscous fluid, and bottom plate portion. 2... Bottom plate, 3... Viscous fluid, 7... Resistance plate, 7
a...Circular resistance plate, butt...Side, 9...Rectangular, 1
1...L shape. Agent Patent Attorney Kiyoshi Sakai Figure 6 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A resistance plate (7) is immersed in a viscous fluid (3) stored on a bottom plate (2) so that the resistance plate (7) receives shear resistance from the viscous fluid (3). A viscous damper having a shape in which a plurality of circular resistance plates (7a) are arranged in a straight line and at least both sides (8) in the parallel direction are surrounded by a straight line. 2. The resistance plate according to claim 1, which has a rectangular shape (9). 3. The resistance plate according to claim 1, which has an L-shape (11).