JPH0713419B2 - Seismic isolation device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a seismic isolation device for buildings.

<< Prior Art >> Various proposals have been made for seismic isolation devices for heavy buildings such as buildings of nuclear power plants or bridges, and some of them have been put into practical use. For example, in JP-A-60-223576,
Between the upper structure as a structure and the lower structure as a foundation, an elastic body made of laminated rubber that supports a vertical load and elastically deforms against a horizontal load, and a predetermined elasticity against a horizontal load. A seismic isolation device is disclosed in which an elasto-plastic damper made of a steel rod or the like that undergoes plastic deformation through deformation is interposed.

In addition, "Nikkei Architecture (December 30, 1985 issue)" discloses an elastic-plastic damper made of twisted coil metal.

<< Problems to be Solved by the Invention >> Among the conventional seismic isolation devices described above, the former configuration in which an elasto-plastic damper is a steel rod is an elastic deformation region because it vertically deforms a vertically arranged steel rod. Is very effective for medium-scale earthquakes and the like because it is narrow and causes plastic deformation with a relatively small amplitude, but the damping effect for a relatively large amplitude such as during a large earthquake is insufficient.

On the other hand, the latter configuration, in which the elasto-plastic damper is a torsion coil type, has a wide elastic deformation range and is effective for large amplitude, but on the other hand, due to the good flexibility due to the coil type, a small amplitude range is not always sufficient. Vibration control effect cannot be obtained.

The present invention has been made in view of such circumstances, and an object thereof is to provide a seismic isolation device in which a vibration damping effect of an elasto-plastic damper is sufficiently obtained over both large and small amplitude ranges.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention provides an elastic structure that supports a vertical load and elastically deforms with respect to a horizontal load between an upper structure and a lower structure of a building. In the seismic isolation device having a body and an elasto-plastic damper that absorbs horizontal relative vibrations generated between the upper structure and the lower structure by deformation of a metal elasto-plastic deformation body, A range in which the relative displacement in the horizontal direction between the upper and lower structures and the intermediate support provided by allowing the damper to move relative to the upper and lower structures in the horizontal direction is not more than a predetermined value. When inside, the restraint means rigidly connects the intermediate support to one of the upper and lower structures, and releases the connection when the relative displacement exceeds the range, and from the intermediate support. One side that extends vertically A first elasto-plastic deformable body locked to the other structure, and a second elasto-plastic deformable body vertically extended from the intermediate support and locked to the other structure. .

<Operation> According to the present invention, when the relative displacement between the upper and lower structures is small vibration within a predetermined value, the intermediate support is rigidly connected to one of the upper and lower structures by the restraining means and moves integrally. Therefore, relative displacement does not occur between this intermediate support and one structure, but relative displacement occurs between the intermediate support and the other structure. Therefore, a horizontal load acts on the second elastic-plastic deformation body provided between the intermediate support and the other structure, and the vibration energy is absorbed by the deformation of the second elastic-plastic deformation body.

Further, when a large vibration in which the relative displacement between the upper and lower structures exceeds the predetermined value, the connection between the intermediate support body and one of the structures is released by the restraining means, and the relative movement between them is allowed. The horizontal load also acts on the first elasto-plastic deformation body provided between the intermediate support and the one structure, and the vibration energy is absorbed by the deformation of the first elasto-plastic deformation body. It

Therefore, a sufficient vibration damping effect can be obtained over the entire amplitude range.

Example An example of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in the figure, an elastic body 3 formed by laminating a rubber plate and a metal plate between an upper structure 1 such as a structure and a lower structure 2 such as a foundation, and those upper structures. The seismic isolation device is constituted by interposing a elasto-plastic damper 4 which absorbs relative vibration in the horizontal direction generated between 1 and the lower structure 2 by the deformation of the elasto-plastic deformation body made of metal.

The elastic body 3 has a rubber plate 3a formed in a flat plate shape such as neoprene rubber and a metal plate 3b formed in the same shape made of a metal, which are alternately laminated with an adhesive agent interposed therebetween. The flat plate-shaped end plates 3c, 3c are attached and configured, and each of the end plates 3c, 3c is composed of the upper structure 1 and the lower structure 2 described above.
It is fixed to and respectively. The elastic body 3 supports a vertical load and elastically deforms with respect to a horizontal load to allow relative displacement between the upper structure 1 and the lower structure 2.

The elasto-plastic damper 4 mainly suppresses relative vibration in the horizontal direction, and an intermediate support 7 provided to allow relative movement in the horizontal direction with respect to each of the upper and lower structures 1 and 2.
When the relative displacement in the horizontal direction between the upper and lower structures 1 and 2 is within a predetermined value or less, the intermediate support 7 is placed on either of the upper and lower structures 1 and 2. That is, in the present embodiment, the restraint means 8 rigidly connected to the lower structure 2 and releasing the connection when the relative displacement exceeds the range,
A first elasto-plastic deformable body 6 extending vertically downward from the intermediate support 7 and locked to the one structure, that is, the lower structure 2, and vertically upward from the intermediate support 7. The second elasto-plastic deformation body 5 is extended and locked to the other structure, that is, the upper structure 1.

The first and second elasto-plastic deformation bodies 5 and 6 are composed of a plurality of damper elements 5a and 6a such as steel rods or steel plates along the vertical direction, which are arranged at intervals in the horizontal direction on the intermediate support 7. It is fixed. Further, each damper element 6a of the first elasto-plastic deformation body 6 has its lower end fixed to the lower structure 2 to support the intermediate support 7, while each damper element 5a of the second elasto-plastic deformation body 5a. The upper end of the is loosely inserted in the recess 1a formed in the upper structure 1.

The intermediate support 7 is formed of a rigid body such as metal into a flat plate shape, and both ends of the intermediate support 7 along the arrangement direction of the damper elements 5a and 6a are locked to the lower structure 2 by the restraining means 8.

Each restraint means 8 is constituted by, for example, a right-angled triangular block 9 having its right-angled portions 9 a pivotally attached to both ends of the intermediate support 7 via pins 10. One acute-angled portion 9b of each block 9 is brought into contact with the upstanding side surface 2b of the stepped portion 2a formed in the lower structure 2, and the roller provided at the other acute-angled portion 9c.
11 is an engaging protrusion of a constant width w protruding to the lower part of the upper structure 1.
It is transposed to the underside of twelve.

Then, in a normal state, each block 9 receives a little load of the upper structure 1, and thereby a rotational moment acts on each block 9, so that one acute angle portion 9b of each block 9 of the lower structure 2 is The side surface 2b of the stepped portion 2a is pressure-contacted, whereby the intermediate support 7 is rigidly connected to the lower structure 2.

Therefore, within the range in which the load of the upper structure 1 acts on the block 9, that is, the range in which the roller 11 is in contact with the lower surface of the engaging projection 12 formed to have a constant width w, the upper and lower structures 1 and 2 are When a horizontal relative displacement occurs due to a small earthquake or the like, the intermediate support 7 is maintained rigidly connected to the lower structure 2, whereby the intermediate support 7 is integrated with the lower structure 2. The upper structure 1 is moved relative to the upper structure 1.

Therefore, the damper element 5a of the second elasto-plastic deformation body 5 engages with the upper structure 1 via the recess 1a, and only the second elasto-plastic deformation body 5 side exhibits the damper function, The elastoplastic deformation body 6 side does not function.

Further, when the load of the upper structure 1 does not act on the block 9, that is, from the lower surface of the engagement protrusion 12 to the roller 11
A large relative displacement of a predetermined value w / 2 or more such that
If it occurs between substructures 1 and 2, block 9 will be pin 1
The state in which the intermediate support body 7 and the lower structure 2 are connected by the restraint means 8 is released and the restraint is released. That is, in this state, the intermediate support 7 is independent of the lower structure 2 and is also relatively movable horizontally relative thereto. Therefore, after this state, the first
The damper element 6a of the elastic-plastic deformation body 6 of
It exhibits a damper function together with the elasto-plastic deformation body 5 and contributes to absorption of vibration energy.

Therefore, according to the above-described embodiment, when the relative displacement generated between the upper and lower structures 1 and 2 vibrates with a small amplitude in the range of a predetermined value or less, the vibration energy is generated by the deformation of only the second elasto-plastic deformable body 5. On the other hand, when the relative displacement is large-amplitude vibration exceeding the predetermined value w / 2, both the second elasto-plastic deformation body 5 and the first elasto-plastic deformation body 6 can absorb the vibration energy. , It becomes possible to absorb the vibration energy sufficiently over the entire amplitude range.

It should be noted that, in the drawings, the protrusions 7a formed on both ends of the intermediate support 7 so as to project upward respectively, the relative displacement between the upper structure 1 and the intermediate support 7 becomes extremely large. When the deformation of the elasto-plastic deformable body 5 approaches the limit, the intermediate support body 7 is brought into contact with the upper structure 1 side to move integrally with the upper structure 1, and thereafter the horizontal load is positively applied. 1
The first elasto-plastic deformable body 6 functions to absorb the vibration energy.

Further, in the above-described embodiment, the load of the intermediate support 7 and the restraint means 8 and the load of the upper structure 1 slightly applied to the restraint means 8 are applied from the lower structure 2 side via the first elastic-plastic deformable body 6. These loads are supported from the lower structure 2 side by, for example, supporting the intermediate support 7 on a carriage that is horizontally movably mounted on the lower structure 2. It is more preferable to prevent vertical load from acting on the first elastic-plastic deformation body 6 as much as possible.

In addition, in the above-described embodiment, the intermediate support 7 is restrained to the lower structure 2 side by the restraining means and moved integrally over a range in which the relative displacement is the predetermined value w / 2 or less. It is also possible to have a structure in which the upper structure 1 is constrained to move integrally.

Further, although not shown, a plurality of elasto-plastic dampers 4 having the above-mentioned configuration are installed, and the arrangement directions thereof are arranged in various directions such as radial directions.

<Effects> In summary, according to the present invention, when the relative displacement between the upper and lower structures is small vibration within a predetermined value, the intermediate support is rigidly connected to one of the upper and lower structures by the restraining means to form an intermediate structure. The support is moved only relative to the other structure, whereby a horizontal load is applied only to the second elasto-plastic deformation body side provided between the intermediate support and the other structure, and the second load is applied. The vibration energy is absorbed by the deformation of the elasto-plastic deformable body, and when the relative displacement between the upper and lower structures exceeds the prescribed value, the connection between the intermediate support and one structure is released by the restraint means. And allow relative movement between them, thereby applying a horizontal load to the first elasto-plastic deformation body provided between the intermediate support body and one of the structures, and the first elasto-plastic deformation body It also absorbs vibration energy due to body deformation. With this configuration, the horizontal vibration can be sufficiently damped over the entire amplitude range of large and small, and the vibration damping performance can be improved as much as possible.

[Brief description of drawings]

 FIG. 1 is a vertical sectional view showing an embodiment of the present invention. 1 ... Upper structure, 2 ... Lower structure 3 ... Elastic body, 4 ... Elasto-plastic damper 5 ... Second elasto-plastic deformation body 6 ... First elasto-plastic deformation body 7 ... Intermediate support Body, 8 ... Restraint

Claims (1)

[Claims] 1. An elastic body supporting a vertical load and elastically deforming against a horizontal load between an upper structure and a lower structure of a building, and between the upper structure and the lower structure. In a seismic isolation device that interposes an elasto-plastic damper that absorbs the generated relative vibration in the horizontal direction by the deformation of a metal elasto-plastic deformable body, the elasto-plastic damper is provided in the horizontal direction with respect to each of the upper and lower structures. When the relative displacement in the horizontal direction between the upper and lower structures and the intermediate support provided to allow relative movement to the upper and lower structures is within a predetermined value or less, the intermediate support is moved to the upper and lower structures. A restraint means that is rigidly connected to either one of the objects and that releases the connection when the relative displacement exceeds the range; and a structure that extends in the vertical direction from the intermediate support and is associated with the one structure. The first elasto-plastic deformation body stopped, and Seismic isolation device comprising a second elastoplastic deformation body is extended vertically from the intermediate carrier is engaged with the other of the structure, that was formed from.