JP2006152738A - Seismic isolation damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic isolation damper which is available together with a seismic isolator, for instance, to minimize vibration energy, and particularly a seismic isolation damper which has a U-shaped damper main body, wherein the seismic isolation damper prevents a bent portion of the U-shaped damper main body from hanging, to thereby ensure its vibration energy absorbing performance stably over a long period of time. <P>SOLUTION: The seismic isolation damper is available together with the seismic isolator to minimize vibration energy transmitted to a building structure at the time of an earthquake. The seismic isolation damper is comprised of the damper main body 1 which is made of a metal such as lead and shaped by bending into an almost U shape, and a support member 3 which is arranged under the damper main body 1, for preventing the bent portion 12 of the damper main body from hanging. The support member 3 is disposed in a manner abutting on the damper main body 1 or almost abutting on the same, for instance. It is preferred that the support member 3 has a flat and smooth upper surface and is made of steel or a material having an almost equivalent hardness to that of the steel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seismic isolation damper that reduces vibration energy transmitted to a building or the like when an earthquake occurs in combination with, for example, a seismic isolation isolator.

  Conventionally, in order to protect buildings in the event of an earthquake, the building is constructed by interposing an isolation device consisting of an isolation isolator and an isolation damper between the upper structure of the building and the lower structure on the foundation side. It is known to reduce the vibrational energy transmitted to an object.

  As the seismic isolation isolator, generally, an elastic plate made of rubber or the like and a rigid plate such as a steel plate are alternately laminated in the vertical direction. In addition, as the seismic isolation damper, those generally made of a metal such as lead are often used. Has been proposed.

  As described above, when the damper main body is bent in a substantially U shape with a metal such as lead, the bent portion does not greatly swing in the vertical direction when an earthquake occurs, and the energy absorbing performance can be satisfactorily exhibited. However, due to the influence of gravity, when the horizontal shaking that occurs at the time of the earthquake is repeated, there is a risk that the bending energy will gradually sag and the vibration energy absorption performance will deteriorate.

JP-A-2-194233 JP 2004-11273 A

  The present invention has been proposed in view of the above problems, and provides a seismic isolation damper capable of preventing the bent portion of the U-shaped damper body from drooping and maintaining stable vibration energy absorption performance for a long period of time. The purpose is to do.

  In order to achieve the above object, the seismic isolation damper according to the present invention has the following configuration. That is, a seismic isolation damper used in combination with a seismic isolation isolator to reduce vibration energy transmitted to a building structure when an earthquake occurs, and the seismic isolation damper is formed by bending a metal such as lead into a generally U shape. The main body is provided, and a support member for preventing the drooping of the bent portion of the damper main body is provided at a lower portion of the damper main body.

  As described above, according to the present invention, it is possible to prevent the bent portion from drooping with a very simple configuration in which a support member for preventing the damper main body bent portion from hanging down is provided at the lower portion of the damper main body. It becomes. In addition, it is thought that such a configuration has been inappropriate so far because it is considered that if the support member as described above is provided in the lower part of the damper main body, the movement of the damper main body is restricted and the vibration energy absorption performance is reduced. It has not been implemented. The reason for this is that when an earthquake occurs, the bent part of the damper body moves up and down, but if any member is installed under the bent part, the bent part comes into contact with it and the vertical movement is hindered. It was thought that absorption performance fell and a structure was damaged.

  However, the present inventors have found that the above-described problems do not necessarily occur from simulations by numerical analysis and actual machine test results. In particular, if the lower part of the bent part is in contact with a support member having a flat and smooth upper surface, the energy absorption performance will be lowered even if the lower support member is prevented from moving up and down by the lower support member when an earthquake occurs. And the structure was not damaged.

  In other words, the present invention is characterized in that a support member is installed under the bent portion of the damper main body, which has been considered inappropriate until now, so as to be in contact with or almost in contact therewith. As a member, having a flat and smooth upper surface is effective in order to prevent the movement of the bent portion as much as possible. Moreover, it is preferable that the surface of the supporting member has a sufficient hardness so as not to be greatly deformed by contact with the damper main body. For example, a material such as a steel material or a metal having substantially the same hardness as the steel material is desirable.

  Hereinafter, a seismic isolation damper according to the present invention will be specifically described based on an embodiment shown in the drawings. FIG. 1 is a perspective view showing an embodiment of a seismic isolation damper according to the present invention, FIG. 2A is a plan view of the seismic isolation damper, and FIG.

  In this embodiment, the damper main body 1 is formed of a metal such as lead into a substantially U-shaped side surface as shown in FIG. 1 and FIG. The thickness and width are formed so as to be slightly larger, and the mounting plates 2 are integrally provided at both end portions 11 and 11 thereof.

  In this embodiment, the support member 3 is installed at the lower part of the damper main body 1 so as to be in contact with or almost in contact with the damper main body 1. The support member 3 is provided so as to cover substantially the entire lower surface of the damper main body 1. In the figure, the support member 3 has a stepped shape in which one end portion (free end portion) 3a is thinly formed. The support member 3 may be provided only below the bent portion 12 of the damper main body 1.

  The upper end 11 of the damper body 1 is attached to the upper structure F1 such as a building with a bolt 4 or the like via the mounting plate 2 as shown in FIG. 2B, for example, and the lower end 11 Is attached to the lower structure F2 such as the foundation of a building through the mounting plate 2 and the support member 3 as shown in the figure with bolts 4 or the like. As shown, mounting holes 2a and 3a through which the bolts 4 are inserted are provided.

  When the damper main body 1 is attached to the upper and lower structures F1 and F2 as described above, for example, when the left and right structures F1 and F2 and the damper main body 1 are vibrated in the horizontal direction in FIG. The opposite ends 11 and 11 are subjected to forces that are shifted in opposite directions, and the bent portion 12 of the damper body 1 is bent so as to swing up and down, but when a downward force is applied to the bent portion 12, The bent portion 12 comes into contact with the support member 3 to prevent further downward movement. As a result, even if the above vibration is repeated, the bent portion 12 does not move further downward, and the bent portion 12 can be satisfactorily prevented from drooping as described above.

  Further, during the vibration, the support member 3 hardly affects the energy absorption characteristics of the damper, and the reason can be explained as follows. That is, when the upper end portion 11 of the damper main body 1 is displaced in the right direction in FIG. 2B, for example, due to the horizontal shaking caused by the occurrence of the earthquake, the bent portion 12 tends to be displaced downward. However, when the bent portion 12 comes into contact with the lower support member 3, the downward displacement is prevented, and the bent portion 12 is deformed so as to be lifted. Next, when the end portion 11 returns to the left in FIG. 2B on the upper side, the bent portion 12 is displaced upward, so that it is separated from the lower support member 3.

  After that, the bent portion 12 again comes into contact with the lower support member 3 when the upper end portion 11 is displaced to the maximum amplitude in the right direction, but the bent portion has already been in the initial quarter cycle. Since it is deformed so as to be lifted, the second contact with the support member 2 is performed for a short time, so that it is prevented from sagging from gravity. After all, the bending part 12 contacts the support member 3 and receives a large force due to the shaking at the time of the earthquake only during the very initial period, and after that, it is affected only by a slight degree that prevents the drooping due to gravity. . Therefore, the support member 3 hardly affects the energy absorption characteristics of the damper.

  In the above embodiment, the support member 3 is installed at the lower part of the damper main body 1 so as to be in contact with the damper main body 1. However, the support member 3 does not necessarily need to be in contact with the damper main body. There is no problem even if it is a little away. Specifically, for example, if the distance between the damper main body 1 and the support member 3 is about 20 mm or less, there is almost no hindrance in terms of action and effect, and there is no concern about the apparent sag.

  Further, in the above-described embodiment, the planar shape of the intermediate portions 13 and 13 between the both end portions 11 and 11 and the bent portion 12 of the damper main body 1 is bent and formed in a substantially S shape as shown in FIG. Although the thing was used, it is not restricted to this, A substantially linear thing may be sufficient, and the shape of the edge part 11 of the damper main body 1, the attachment plate 2, and the supporting member 3 can also be changed suitably.

  As an example of the present invention, the seismic isolation damper shown in FIG. 1 and FIG. 2 was analyzed for reciprocal displacement corresponding to the amplitude fluctuation of the upper building in the horizontal direction in the in-plane horizontal direction. That is, the lower end portion 11 of the damper main body 1 is fixed, the upper end portion 11 is displaced by 50 mm in the horizontal right direction in FIG. 2, and then the upper end portion 11 passes through the original position in the left direction. The deformation was repeated 100 mm until it was further shifted to the left by 50 mm and then displaced 100 mm to the right again.

  As the above comparative example, reciprocal displacement was analyzed in the same manner as described above with the same configuration as in the above example except that the support member 3 was not provided below the damper main body 1. The result is shown in FIG. This figure shows the history curves of displacement and horizontal reaction force in the above-mentioned examples and comparative examples, where solid line A is an example and broken line B is a comparative example. As is apparent from the figure, it can be seen that the characteristic of the damper is influenced by the support member only during the very initial period. In addition, the damper body was actually made of lead and the actual machine was tested. As a result, in the vibration test of 20 reciprocations with an amplitude of 50 mm, the influence on the characteristics and life due to the presence of the support member 3 could not be found.

  The seismic isolation damper according to the present invention can satisfactorily prevent the bent portion 12 of the damper main body 1 from drooping with a very simple configuration by simply providing the support member 3 for preventing the drooping at the lower portion of the damper main body 1. By providing the support member 3 as described above, the vibration energy absorption performance is not lowered, and it is possible to provide a seismic isolation damper with good durability and reliability at low cost. As a result, the degree of freedom of design and selection of seismic isolation dampers can be increased and industrial applicability can be increased.

The perspective view which shows one Embodiment of the seismic isolation damper by this invention. (A) is a top view of the said seismic isolation damper, (b) is the side view. The analysis figure of the hysteresis curve of the displacement-horizontal reaction force in an Example and a comparative example.

Explanation of symbols

1 Damper body 1
DESCRIPTION OF SYMBOLS 11 End part 12 Bending part 2 Mounting plate 3 Support member

Claims (3)

  A seismic isolation damper that is used in combination with a seismic isolation isolator to reduce vibration energy transmitted to a building structure when an earthquake occurs, and the seismic isolation damper has a damper body that is bent and formed in a generally U shape with a metal such as lead. And a base isolation damper provided with a support member for preventing the bent portion of the damper main body from drooping at a lower portion of the damper main body.   2. The seismic isolation damper according to claim 1, wherein the support member is provided in contact with or almost in contact with the damper main body.   2. The seismic isolation damper according to claim 1, wherein the support member has a flat and smooth upper surface and is made of steel or a material having substantially the same hardness as the steel.

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