JPS62206176A - Earthquake damping support apparatus for building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a seismic isolation bearing device that supports structures such as bridges and buildings and absorbs vibrations caused by forced vibrations such as earthquake motion. The present invention relates to a seismic isolation bearing device in which a viscous shear resistance portion is provided in a bearing body.

[Prior art] This type of seismic isolation bearing device has already been disclosed in Japanese Patent Application Laid-Open No. 54-1600.
There is one disclosed in Publication No. 37 (hereinafter referred to as "prior art").

Figure 7 shows an outline of this prior art. Here, a is an upper surface plate, b is a lower surface plate, C is a rubber support interposed between the upper surface plate a and the lower surface b, and a circular hole d is bored in the center of the rubber support C. It has been done. Inside the circular hole d, a plurality of disc-shaped movable resistance plates f are stretched over a column e hanging from the top plate a, and a fixed resistance plate g embedded in the wall of the circular hole d is arranged so as to fit into the gap between the movable resistance plates f;
Moreover, the circular hole d is filled with a viscous fluid h.

With this structure, when the rubber support C undergoes horizontal shear deformation due to earthquake motion, the movable resistance plate f and the fixed resistance plate g
A relative displacement occurs between the two paper drag plates, and a viscous fluid h
Because of this, viscous shear resistance occurs, which brakes the movement of the movable resistance plate f, and eventually.

The vibrations of the superstructure resting on the bearing device will be damped.

However, in the structure of the prior art, it is difficult to maintain the gap between the movable resistance plate f and the fixed resistance plate g (the gap must be extremely small to effectively generate viscous shear resistance). ) Furthermore, in actual earthquake motion, bending deformation is usually applied to the support device, and the movable resistance plate f and fixed resistance plate g come into contact, which may cause damage. Furthermore, between the outer circumferential surface of the movable resistance plate f and the inner hole d of the rubber support C, or also between the fixed resistance g
A gap corresponding to the horizontal displacement must be provided between the inner circumferential surface of the column and the column e, which has the disadvantage that the size of the rubber support C becomes large.

[Technical Problem of the Present Invention] In view of the problems of the above-mentioned prior art, the present invention provides a seismic isolation bearing device that efficiently adds viscous damping capacity and can effectively cope with shear deformation caused by bending. The purpose is to
(technical means).

[Configuration of the present invention] In order to achieve the above object, the seismic isolation support device for structures of the present invention adopts the following configuration (technical means). That is, (1) there is a vertical direction in the center of the device, which is composed of an upper plate attached to the upper structure, a lower plate attached to the lower structure, and an elastic support interposed between the upper plate and the lower plate; A circular hole is bored, and a large number of linear members with smooth surfaces are densely arranged independently of each other in the circular hole, and a viscous substance is filled in the circular hole. .

In the above configuration, the viscous shear resistance section is configured by the circular hole, the linear member and the viscous substance inserted into the circular hole.

In addition to the usual viscous substances such as silicone oil, the viscous substances include high-viscosity viscous substances such as polyisobutylene, polypropylene, etc. in order to particularly improve damping characteristics.
Polymeric viscous substances such as polybutene or asphalt are used.

[Operation] When a structure is subjected to strong and sudden vibrations, this device undergoes shear deformation. The elastic support 5 follows this deformation, but the viscous shear resistance generating portion resists the vibration displacement.

In other words, since the individual linear members are independent from each other, they extremely easily follow shear deformation caused by external forces, and the individual linear members uniformly fall in the same direction. Since a viscous substance is interposed in the gap between the linear members, viscous shear resistance occurs between the two surfaces of the linear member that are relatively displaced in the axial direction, and each linear member has a resistance force in the axial direction. This resists the horizontal displacement, and this resistance force is combined and acts in a direction to stop the vibration of the structure.

In addition, since viscous shear resistance is inversely proportional to the gap and directly proportional to the area of the part immersed in the fluid and the relative velocity of the two surfaces,
The larger the area and relative velocity of the part immersed in the fluid, the greater the
The smaller the gap between the linear members, the greater the braking force can be obtained.

And when using a high viscosity polymer viscous body as the viscous body,
This trend is one MIB author. Namely.

I+A Umbrella Toshi μ Melem Fuyo F-L Ricono cA Relto ▲ 11-Sho - Zentsutsu 1 Munchu ▲ One-fluid characteristics (as the velocity of the fluid increases, it changes from high viscosity to low viscosity and becomes easier to flow, This is a phenomenon in which the degree of increase in resistance force becomes smaller.), and exhibits effective damping characteristics for vibrating structures.

[Effect] The seismic isolation support device for structures of the present invention has the above configuration,
Since it works, it has the following unique effects.

■ By closely arranging the linear members in the vertical direction within the circular hole, it is possible to easily obtain a large number of minute gaps necessary for viscous shear resistance. deformation (including bending and shear deformation), and there is no deterioration in performance.

(2) The individual linear members easily follow bending and shearing deformation, and no functional impairment occurs between the linear members, so there is no need to take special consideration to the deformation.

■ In the device of the present invention, j±, @t. It is not necessary to provide a movement interval (space) that allows the water displacement of A-sweeping, which is difficult to achieve in the next competition, and viscous damping ability can be added efficiently.

[Example] An embodiment of the present invention will be described below based on the drawings.

1 to 3 show an embodiment of the seismic isolation bearing device of the present invention.

Here, G is a bridge girder, a superstructure such as a building, B is a bridge pier,
Substructures such as foundations.

This support device iH is interposed between the upper structure G and the lower structure B, and is designed to perform the vibration damping function as well as the support function. It is composed of the main parts of the bottom plate 31, the elastic support 5, and the viscous shear resistance section 10.

The upper surface plate 1 is made of a rectangular or disk-shaped (disc-shaped in the figure) steel plate, and is attached to the lower surface of the upper structure G. Bolt insertion holes are bored at appropriate intervals on the peripheral edge of the upper plate 1. An anchor port 2 is embedded in the upper structure G with a threaded portion protruding, the threaded portion is inserted into a bolt insertion hole of the top plate l, and the bolt 2a is tightened and fixed.

The lower plate 3 is made of a rectangular or disc-shaped (disk-shaped in the figure) steel plate like the upper plate 1, and is attached to the upper surface of the lower structure B. The lower plate 3 is also provided with a bolt insertion hole in the same manner as the upper plate 1, and the threaded portion of the anchor bolt 4 embedded in the lower structure B is inserted through the hole, and is fixed by tightening with a screw 4a.

The fixing of the upper surface plate 1 and the upper structure G, and the lower surface plate 3 and the lower structure B is not limited to this mode. taken.

The elastic support 5 has a laminate structure mainly consisting of a hard or soft rubber body 6 (usually natural rubber) and a steel plate 7 (or canvas, etc.) embedded as a reinforcing material, but it is not possible to use only the rubber body. Of course, chloroprene synthetic rubber may also be used for the rubber body.

The elastic support 5, the upper plate l, and the lower plate 3 are firmly bonded (
For example, vulcanization or adhesive bonding).

The viscous shear resistance section 10 of this embodiment is configured as follows.

A circular hole 11 is formed in the center of the elastic support 5 in the vertical direction, and a large number of elongated steel wires 12 having a circular cross section are inserted closely into the circular hole 11.

The diameter of the circular hole 11 is determined within a range that does not reduce the loading capacity of the elastic support 5 and according to the required viscous resistance.

The steel wire 12 serving as the linear member is selected from a material having sufficient rigidity and wear resistance. Stainless steel is suitable as such. Also.

The surface is smoothed. The diameter of the steel wire 12 is selected depending on the size of the circular hole 11, and is usually 1. (It is said to range from 1.0 to 5.01.

The steel wires 12 are inserted into the circular hole 11 as tightly as possible, and therefore the number of steel wires 12 that can be inserted into the circular hole 11 is determined by the diameter of the circular hole 11.

The circular hole 11 is further filled with a viscous substance 13, and the viscous substance 13 fills the gaps between the steel wires 12.

FIG. 3 shows an enlarged view of the relationship between the steel wires 12. That is, the gaps between the steel wires 12 are filled with the viscous substance 13 in a communicating state, and the surface 12a of the adjacent portion of the steel wires 12 is
are opposed to each other with a viscous substance 13 interposed therebetween, with a minute interval between them, and this portion constitutes a viscous shear resistance generation site.

Next, the operation of the apparatus H of this embodiment will be described (see FIG. 4).

The support of the normal upper structure G is stably supported by the elastic supports 5 ensuring a required bearing pressure area.

Earthquakes and other causes (e.g. gusts of wind, vehicle braking, etc.)
When a stronger and more rapid vibration occurs, a sudden relative displacement occurs between the upper and lower structures, G, and B. Superstructure G
Due to the relative displacement between and the lower structure B, the upper part,
Although the main support device H placed between the lower structures G and B is also displaced accordingly, the elastic support 5 easily follows and is inserted into the circular hole 11 and the circular hole ti. The steel wire 12 is sheared and displaced in the horizontal direction.

Now, following the superstructure G, the main support device lH is moved in the direction A (
Assuming that the steel wires 12 are displaced as shown in FIG.
A will shift from each other at a speed of vl and ma2 (in Fig. 4, ma shows a velocity vector diagram).
Since the viscous substance 13 is present between the surfaces 12a, viscous shear resistance is generated between the two relatively displaced surfaces, thereby braking the steel wire 12 from falling. As a result,
The relative displacement between the upper structure G and the lower structure B is gradually reduced.

When the upper structure G is relatively displaced in the opposite direction, the steel wires 12 fall in the opposite direction to the above, and braking force is similarly applied to the steel wires 12 to gradually reduce the vibration width.

FIG. 5 shows another embodiment (second embodiment) of the present invention.

In this embodiment, the linear member 15 has a rectangular cross section. In the embodiment in which the viscous substance 13 is interposed in the gap between the linear members 15, the gap distance between the surfaces 15a of the linear members 15 is constant, and it is possible to obtain a larger viscous shear resistance. can.

FIG. 6 shows yet another embodiment (third embodiment).

In this embodiment, the linear member 16 has a triangular cross section. The gap between the surfaces 16a of the linear member 16 is filled with the viscous substance 13.

The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included within the technical scope of the present invention.

- The overall shape of this support device is not limited to a cylindrical shape, but may be a cubic shape or other polygonal prism shape.

(2) The linear member is not limited to steel or other metals, but may be made of synthetic resin as long as it can ensure the required rigidity.

[Brief explanation of drawings]

1 to 6 show an embodiment of the seismic isolation bearing device of the present invention, and FIG. 1 is a partially cross-sectional, partially side view showing the structure of one embodiment (Y-Y line diagram in FIG. 2). ), Fig. 2 is a central cross-sectional view (x-X line diagram in Fig. 1), Fig. 3 is a partially enlarged sectional view of the main part of the present invention (viscous shear resistance part), Fig. 4 is a viscous shear FIG. 5 is a partially enlarged cross-sectional view of another embodiment, and FIG. 6 is a partially enlarged cross-sectional view of still another embodiment. FIG. 7 is a sectional view showing the structure of the prior art.

Claims (1)

[Claims] 1. A top plate (1) attached to the upper structure (G);
A support device comprising a lower plate (3) attached to the lower structure (B), and an elastic support (5) interposed between the upper plate (1) and the lower plate (3), A vertical circular hole (11) is provided in the center of the elastic support (5).
) is bored, and in the circular hole (11), a large number of linear members (12) with smooth surfaces are arranged densely and independently from each other, and a viscous substance (13) is filled. A seismic isolation support device for a structure, characterized by: