JPH0220741A - Horizontal deformation limiter for earthquake-proof structure - Google Patents

Abstract

PURPOSE:To secure such a device that makes a building function as an earthquake-proof structure normally in any case by setting up an arresting member locked to a substructure in an outer circumferential part of an engaged member locked to a superstructure. CONSTITUTION:A device A consists of an engaged member 1 being locked to the underside of a superstructure B1 and an arresting member 2 being locked to a substructure B2 and consisting of a ring plate 2a and an elastic body 2b. The arresting member 2 is made up of sticking the elastic body 2b to the ring plate 2a and stacking both alternately, and it is set up in an outer circumferential part of the engaged member 1 at a required distance in a gap with that. This arresting member 2 receives the engaged member 1 when the superstructure B1 has produced such a horizontal displacement as more than a distance between it and the engaged member 1, whereby it limits an amount of horizontal travel of the engaged member 1 as absorbing vibrational energy of the superstructure B1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a horizontal deformation limiting device for a seismic isolation structure that limits the amount of displacement when the seismic isolation structure undergoes large deformation.

[Problem to be solved by the invention]

For seismic isolation structures that use seismic isolation devices such as laminated rubber bearings,
It is necessary to provide a fail-safe mechanism in buildings as a safety measure against excessive inputs such as those caused by large earthquakes.

The fail-safe mechanism that has been proposed so far is to form a stick-like leg that supports the load in place of the seismic isolation device in the event that it loses its vertical load-supporting ability due to severe deformation. The system is designed to prevent buildings from falling in an emergency by assuming that the seismic isolation device loses its function, but it has a decisive weakness in that once the seismic isolation device is activated, the building's function as a seismic isolation structure is lost. .

This invention was made by focusing on the weaknesses of this conventional fail-safe mechanism, and aims to propose a new device that allows a building to function normally as a seismic isolation structure under any circumstances.

[Means to solve the problem]

In the present invention, an engaging member that is shorter than the distance to the lower structure is vertically fixed to the lower surface of the upper structure, a restraining member consisting of a ring plate and an elastic body is fixed to one of the lower structures, and the upper structure A seismic isolation device that receives the engaging member when the body is horizontally displaced, restrains the movement of the engaging member while absorbing the impact force, and limits the deformable range of the engaging member, that is, the upper structure, to a certain limit. By taking advantage of this effect, we aim to maintain its function as a seismic isolation structure.

The restraining member is constructed by stacking annular ring plates and elastic bodies alternately, and adhering the elastic bodies to the ring plate, and is arranged on the outer periphery of the engagement member with a required distance therebetween.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

The horizontal deformation limiting device A (hereinafter referred to as device A) of this invention is an upper structure B of a seismic isolation structure that is divided into upper and lower parts through a seismic isolation device.
It is installed between the upper structure B1 and the lower structure 82, and maintains the safety of the upper structure B1 in unexpected situations without sacrificing the seismic isolation effect.

As shown in FIG. 1, apparatus A has a partial structure B.

It is composed of an engaging member 1 fixed to the lower surface of the lower structure B2, and a restraining member 2 fixed to the lower structure B2 and consisting of a ring plate 2a and an elastic body 2b.

As shown in the figure, the restraint member 2 is formed by bonding an elastic body 2b to a ring plate 2a and stacking the two alternately, and is arranged on the outer periphery of the engagement member 1 with a required distance therebetween.

This restraining member 2 receives the engaging member 1 when the upper structure B1 is horizontally displaced by a distance greater than the distance between the upper structure B1 and the engaging member 1, and absorbs the vibration energy of the upper structure B. It limits the amount of horizontal movement and serves to keep the horizontal deformation of the seismic isolation device within a certain limit even in the event of an unexpected seismic movement that exceeds the design seismic motion.

In the embodiment shown in FIG. 2, the distance between the ring plate t-2a and the engaging member 1 is gradually increased from the top to the bottom, so that the restraint member 2 gradually increases the resistance force, and the distance between the ring plate t-2a and the engaging member 1 is gradually increased. It has a structure that locks onto the engaging member 1, and has a mechanism that relieves the impact force applied to the upper structure B1. Similar effects can be obtained from the engaging member I of the embodiment shown in FIG.
It can also be obtained by forming it into an inverted conical shape.

By the way, in the above embodiment, by using a viscoelastic material such as high damping rubber for the elastic body 2b, the apparatus A itself can have damping performance, and the engaging member 1, the restraining member 2, or both can be provided with damping performance. By immersing the device in a viscous fluid that exerts viscous resistance, the device A can be given horizontal and vertical damping performance and can also have the function of suppressing floating.

〔Effect of the invention〕

As described above, this invention limits the displacement of the upper structure and the seismic isolation device beyond a certain limit, and does not operate within the response range below the set value, which may impede the effectiveness of the seismic isolation device. It is possible for the building to function as a seismic isolation structure at all times.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 -■
, ■ are a sectional view and a plan view, respectively, showing other embodiments. A...Horizontal deformation limiting device, 1...Engagement member, 2...Restriction member, 2a...Ring plate, 2b... Elastic body, B...
- Upper structure, B2...lower structure.

Claims (1)

[Claims] (1) There is a distance between the engaging member vertically fixed to the lower surface of the upper structure of the seismic isolation structure divided into upper and lower parts via seismic isolation bearings, and the outer periphery of this engaging member. a restraining member fixed to the lower structure at a position, receiving the engagement member when the upper structure is horizontally displaced, and restraining the movement;
1. A horizontal deformation limiting device for a seismic isolation structure, characterized in that the restraint member is made up of an annular ring plate and an elastic body, the elastic bodies being adhered to the ring plate and stacked alternately.