JPH02200924A - Earthquake-release device - Google Patents

Abstract

PURPOSE:To increase damping effect by providing an elastic body between upper and lower structures, providing an elastic and plastic deformable body on either one of the structures, and providing a deformable arresting device on the other structure. CONSTITUTION:When a relative displacement is produced between upper and lower structures 1 and 2 due to earthquake, etc., vibrational energy is absorbed by means of an elastic body 3 comprising laminated rubber and an elastic and plastic damper 4. When the relative displacement in the directions of arrows A is produced between the upper and lower structures 1 and 2 due horizontal vibration, a relative movement is produced between an elastic and plastic deformable body 5 and damper rollers 6a and 6b of a deformable arresting device 6, and the curved section 5a of the deformable body 5 is moved in the directions of arrows A to absorb the vibrational energy.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a seismic isolation device for buildings.

(Prior Art) Various proposals have been made regarding seismic isolation devices for heavy buildings such as nuclear power plant buildings and bridges, and some of them have been put into practical use. For example, in Japanese Patent Application Laid-Open No. 60-223576, an elastic layer made of laminated rubber that supports vertical loads and elastically deforms in response to horizontal loads is provided between an upper structure as a building etc. and a lower structure as a foundation etc. body and
A seismic isolation device is disclosed that includes an elastic-plastic damper made of a steel rod or the like that plastically deforms through a predetermined elastic deformation in response to a horizontal load.

In addition, "Nikkei Architecture" (December 30, 1985 issue) discloses an elastoplastic damper constructed of twisted coil metal.

(Problems to be Solved by the Invention) Among the conventional seismic isolation devices described above, the former configuration in which the elastic-plastic damper is made of steel rods deforms the vertically arranged steel rods in the horizontal direction, so the elastic deformation region The vibration damping effect is narrow and plastic deformation occurs with a relatively small amplitude, making it extremely effective against medium-sized earthquakes, etc., but lacks the damping effect against relatively large amplitudes such as during large earthquakes.

On the other hand, the latter configuration, in which the elastic-plastic damper is in the form of a torsion coil, has a wide elastic deformation range and is effective for large amplitudes, but on the other hand, it is not always sufficient in small amplitude ranges due to the good flexibility of the coil shape. vibration damping effect cannot be obtained.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a seismic isolation device in which a vibration damping effect by an elastoplastic damper can be sufficiently obtained over both large and small amplitude ranges.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a laminated rubber that supports a vertical load between an upper structure and a lower structure of a building and elastically deforms against a horizontal load. An elastic body made of metal is provided on one of the upper and lower structures, and a metal elasto-plastic deformable body that extends in a substantially horizontal direction and has a curved part formed in the middle is attached to one of the upper and lower structures. is fixed to the other of the upper and lower structures, and is fixed to the other structure and engages with the curved part of the elastic-plastic deformable body from both sides, so as to provide a bridge between the upper and lower structures. A seismic isolation device is configured by providing a deformation restraint that moves the curved portion in the horizontal direction while deforming the elastic-plastic deformation body when a relative displacement in the water qt force direction occurs.

(Function) According to the present invention, the upper and lower parts of the elastoplastic deformable body are
When relative displacement occurs between the lower structures due to vibration, relative movement also occurs between the elasto-plastic deformable body and the deformation restraint that engages with it, and this causes the elasto-plastic deformable body to deform and curve. The section is moved longitudinally to absorb vibration energy and provide a damping effect. Since this energy absorption action occurs approximately in the same manner within the length of the elastoplastic deformable body, the damping effect does not depend on the amount of displacement, and a sufficient damping effect can be obtained over the entire large and small amplitude range. It will be done.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

In this embodiment, as shown in FIG. 1, an elastic body 3 and an elastoplastic damper 4 are interposed between an upper structure 1 consisting of a building etc. and a lower structure 2 consisting of a foundation etc. for seismic isolation. configuring the device.

The elastic body 3 is made by alternately laminating rubber plates 3a made of neoprene rubber or the like in the shape of a flat plate and metal plates 3b made of metal in the same shape with an adhesive interposed therebetween. It is configured by attaching end plates 3c, 3c having a shape, and each end plate 3c, 3c is fixed to the upper structure 1 and the lower structure 2, respectively. This elastic body 3 supports a vertical load, while elastically deforming in response to a horizontal load, allowing relative displacement between the upper structure 1 and the lower structure 2.

The elasto-plastic damper 4 mainly damps relative vibrations in the horizontal direction, and includes, for example, one metal elasto-plastic deformable body 5 provided on the lower surface of the upper structure 1 and the upper surface of the lower structure 2. One set is constituted by the deformable restraint device 6 consisting of a supported pair of damper rollers 6a and 6b. That is, a concave N1a opening downward is formed in the lower surface of the upper structure 1, and both ends of the elastic-plastic deformable body 5 extending substantially horizontally on both side walls of the four parts 1a are connected to the fixture. It is fixed by 7. The elastic-plastic deformable body 5 is made of, for example, a steel rod or a steel plate and is oblong, and the positions where both ends are supported by the fixture 7 have a step between the top and bottom, and a curved portion 5a curved in a waveform is provided in the middle part thereof. is formed. On the other hand, in the deformable restraint 6, the damper rollers 6a and 6b are connected to the lower structure 2.
The rotary opening is mounted to a support member 8 fixed to the upper surface of the rotor via shafts 9a and 9b. The axes of the respective axes 9a, 9b are along a direction perpendicular to the longitudinal direction of the elastic-plastic deformable body 5 (six directions of arrows in FIG. 1), and are set parallel to each other. The outer peripheral surfaces of the damper rollers 6g and 6b supported by the damper metal 5 are in contact with and engage with the damper metal 5 while sandwiching the corrugated curved portion 5a of the damper metal 5 from both sides thereof.

FIG. 2 shows the planar arrangement of the elastic-plastic dampers 4, in which a plurality of sets of dampers are arranged in parallel as a group, and although not shown, one group of dampers extends along the longitudinal direction of each elastic-plastic deformable body 5. They may be provided in a variety of configurations, such as facing toward each other or in a radial configuration.

According to the configuration of such an embodiment, the upper and lower structures 1 and 2
If a relative displacement occurs due to an earthquake or other vibration, the vibration energy is absorbed by the elastic body 3 made of laminated rubber and the elastoplastic damper 4. In particular, when a relative displacement occurs in the longitudinal direction (in the direction of the arrow in FIG. 1) of the elasto-plastic deformable body 5 between the upper and lower structures 1 and 2 due to vibration in the horizontal direction, the elasto-plastic deformable body 5 Relative movement also occurs between the damper rollers 6a and 6b that are in contact with the damper rollers 6a and 6b, and thereby the wave-shaped curved portion 5a of the elastic-plastic deformable body 5 also moves in the longitudinal direction. Therefore, vibration energy is absorbed by the movement of the curved portion 5a due to the deformation of the elastic-plastic deformable body 5,
A damping effect is exerted.

Since this energy absorption action is performed in a substantially -like manner within the length of the elastic-plastic deformable body 5, the damping effect does not depend on the amount of displacement, and a sufficient damping effect is achieved over the entire large and small amplitude range. You will be able to get it.

In the above embodiment, the elastic-plastic deformable body 5 is provided in the upper structure 1, and the damper rollers 6a and 6b are provided in the lower structure 2, but it goes without saying that these arrangements may be reversed. Further, the number of damper rollers and, by extension, the number of waveform curved portions of the elastic-plastic deformable body are not limited to those of the above embodiments, and can be changed in various ways.

(Effects of the Invention) As described above, according to the present invention, when a relative displacement occurs between the upper and lower structures due to vibration along the longitudinal direction of an elasto-plastic deformable body, the elasto-plastic deformable body and this Relative movement also occurs between the engaging deformation restraint, and as the elasto-plastic deformation body is deformed, its curved portion moves in the longitudinal direction, absorbing vibration energy, and the energy absorption effect of the brackets is reduced to elasticity. Since the damping effect is approximately -like within the length of the plastically deformed body, the damping effect does not depend on the amount of displacement.
The vibration damping effect of the elastic-plastic damper can be sufficiently obtained over the entire large and small amplitude range, and the functionality of the seismic isolation device can be improved as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional plan view taken along the line ■--■ in FIG. 1, showing an example of the damper arrangement of the same embodiment. 1... Upper structure 2... Lower structure 3... Elastic body 4...
・Elastoplastic damper 5...Elastoplastic deformable body 5
a...Curved portion 6...Deformation restraint 6g, 6b...Damper roller

Claims (1)

[Claims] Between the upper and lower structures of a building; an elastic body made of laminated rubber that supports vertical loads and elastically deforms in response to horizontal loads is provided; A metal elasto-plastic deformable body extending substantially horizontally and having a curved part formed in the middle is provided on either one of the structures, with both ends fixed to the one structure, and the upper and lower structures are fixed to each other. On the other hand, it is fixed to the other structure and engages with the curved portion of the elastic-plastic deformable body from both sides, so that when a relative displacement occurs in the horizontal direction between the upper and lower structures, the elastic A seismic isolation device comprising: a deformation restraint that moves the curved portion in the horizontal direction while deforming the plastically deformable body.