JPH0288835A - Seismic damping device - Google Patents

Abstract

PURPOSE:To promote the function of seismic damping against a large earthquake and the like by placing an elastic substance between a building construction and foundation and, at the same time, providing a damper and stopper to absorb horizontal vibration energy. CONSTITUTION:A building construction 4 is held between the building construction 4 and foundation 6 and, at the same time, a horizontal relative displacement of the building construction 4 and foundation 6 is allowed to arrange an elastic substance 8 which transforms elastically. A damper 10 is also provided, and it is interlocked mutually with the building construction 4 and foundation 6 to absorb the horizontal vibration energy in case of transformation of the elastic substance 8. In addition, a stopper 14 constituted of honeycomb members 34a-34c buckled in the horizontal direction is provided, and it is mutually interlocked with the building construction 4 and foundation to absorb the horizontal vibration energy in case of transformation of the elastic substance 8. At the same time as that, the horizontal displacement of the building construction 4 is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration isolation device for protecting a building structure from large vibrations such as a large earthquake.

(Prior art) Conventionally, as this type of vibration isolation device, for example, Japanese Patent Application Laid-Open No. 60-2
Those described in JP-A No. 23576 and the like are known.

That is, between a building structure and its foundation, there is a damper consisting of an elastic body made of laminated rubber plates and steel plates, and a steel rod with one end fixed to the foundation and the other end loosely fitted into the building structure. A cushioning material such as rubber is further interposed in the loose fitting portion.

According to this vibration isolator, the vertical load of the building structure is supported by the foundation via the elastic body, and the small to medium vibrations and minute vibrations in the horizontal direction during small to medium earthquakes and normal times are absorbed by the elastic body and the cushioning material. It is designed to be attenuated. Also,
When the horizontal displacement exceeds a predetermined value during a major earthquake, etc., the steel rods of the damper engage with the foundation and building structure, and the plastic deformation of the steel rods absorbs a large amount of vibration energy. This makes it possible to protect the entire building structure by suppressing skidding and the like as much as possible.

(Problem to be Solved by the Invention) By the way, when considering the occurrence of a large relative displacement in the horizontal direction due to an extremely large earthquake, etc., in the conventional device described above, the horizontal deformation of the elastic body becomes extremely large. the result,
It is conceivable that the elastic bodies supporting the building structure will be destroyed, resulting in a dangerous situation.

Since the supporting capacity of vertical loads is extremely important from the perspective of ensuring the integrity of building structures, it has been considered to limit the relative displacement of building structures in the horizontal direction within a certain range. Various stoppers using chains, etc. are used as a safety mechanism.

However, in the case of the conventional stopper type, it is a hard spring type that suddenly generates a stopping force when large deformation occurs, and there is a risk of applying an impact load to the building structure and generating excessive stress. There is a problem in that there is a risk that impact loads will be applied repeatedly due to the lack of energy absorption due to the decrease in force.

The present invention has been made in view of these circumstances, and is designed to prevent the generation of shocking and excessive stress on building structures even in the event of an extremely large earthquake, and to provide a stopper with sufficient energy absorption. The purpose of this is to prevent repeated impact loads, suppress excessive deformation, ensure the soundness of the vibration isolation device, and prevent the vibration isolation effect from deteriorating during such large earthquakes. .

(Means for Solving the Problems) The present invention provides an elastic body between a building structure and a foundation that supports the building structure and elastically deforms to allow horizontal relative displacement between the building structure and the foundation. , consists of a damper that absorbs vibration energy in the horizontal direction by mutually engaging the building structure and the foundation when the elastic body is elastically deformed, and a honeycomb-shaped member that buckles in the horizontal direction. The structure includes a stopper that engages with the building structure and the foundation to absorb vibration energy in the horizontal direction while regulating horizontal displacement of the building structure.

In particular, the stopper may be constructed by horizontally arranging a plurality of comb-shaped members having different buckling strengths in a layered manner.

(Function) To describe the function of the present invention, in addition to a damper that absorbs vibration energy in the horizontal direction for a building structure with a long period using an elastic body, it also acts as a damper that absorbs vibration energy in the horizontal direction. By providing a stopper that engages with the structure, the stopper functions to absorb vibration energy in the horizontal direction while regulating the horizontal displacement of the building structure in conjunction with the vibration isolation provided by the elastic body and the damper. Furthermore, it becomes possible to reliably prevent excessive relative displacement of the building structure in the horizontal direction.

In particular, by configuring the stopper by arranging a plurality of comb-shaped members having different buckling strengths in a layered manner, vibration energy can be absorbed in stages.

(Example) Hereinafter, an example of the vibration isolation device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vibration isolation device 2 is interposed between the building structure 4 and the foundation 6, and is disposed under the pillars of the building structure 4, respectively. Each vibration isolator 2 includes an elastic body 8 between the building structure 4 and the foundation 6 that supports the building structure 4 and elastically deforms to allow horizontal relative displacement between the building structure 4 and the foundation 6; The elastic body is composed of a damper 10 that mutually engages with the building structure 4 and the foundation 6 to absorb vibration energy in the horizontal direction when the elastic body 8 is elastically deformed, and a honeycomb-shaped member 34 that is buckled in the horizontal direction. The stopper 14 mutually engages the building structure 4 and the foundation 6 by elastic deformation of 8 to absorb vibration energy in the horizontal direction and restrict horizontal displacement of the building structure 4.

Briefly, the elastic body 8 is made by alternately stacking flat rubber plates and steel plates of approximately the same shape, and end plates are attached to the upper and lower ends of the flat rubber plates. It has the load-bearing capacity to share and support the vertical load (weight) of the building structure 4, and also has the ability to displace with respect to the horizontal load (horizontal seismic force). It mainly has the function of buffering and absorbing horizontal vibrations such as those caused by earthquakes.

On the other hand, the damper 10 includes a vertically arranged steel rod 22 having a circular cross section, and a pair of mounting plates 24 arranged at the upper and lower ends of the steel rod 22. The steel rod 22 is loosely fitted into the building structure 4 through the plate 24, and the lower end of the steel rod 22 is fixed to the foundation 6 through the plate 24.

When the relative horizontal displacement between the building structure 4 and the foundation 6 exceeds the clearance of the loose fitting portion at the upper end of the steel rod 22, the steel rod 2
2 engages with the building structure 4 and the foundation 6, and the horizontal vibration energy is largely absorbed by the plastic deformation of the steel rod 22.

On the other hand, as shown in FIG. 2, the stopper 14 is composed of nicomb-shaped members 34a, 34b, and 34c that can be buckled in the horizontal direction, and functions as an auxiliary damper that absorbs vibration energy in the horizontal direction by buckling. It is assumed that the This stopper 14 is arranged at an appropriate distance from the building structure 4 in the horizontal direction. Specifically, the stopper 14 is a collection of a plurality of honeycomb-shaped members 34a, 34b, and 34c having different buckling strengths, and each honeycomb-shaped member 34a, 34b, and 34c is made of thin honeycomb metal, as shown in FIG. Adhesive 4 on both sides of 42
A surface plate 46 is attached through the wafer 4 to form a laminated structure. And these one comb-like member 34a,
34b and 34c are vertical partition plates 4 as shown in FIG.
The structure is such that they are arranged in a layered manner in the horizontal direction via 8. In particular, regarding the individual honeycomb-shaped members 34a, 34b, and 34c, the restoring force exerted by these honeycomb-shaped members 34a, 34b, and 34C against the seismic force that they should buffer and absorb is basically based on buckling behavior. However, due to the characteristics of the honeycomb, namely the incompressible air contained within the honeycomb, it exhibits extremely excellent energy absorption ability. Moreover, as shown in FIG. 4, these honeycomb-shaped members 34a and 34b.

By adding a small amount of Buri-Crush C to 34c, it is possible to eliminate the compressive strength σ that occurs as a large value in order to resist the earthquake force at the early stage of deformation, as shown in Figure 5. Vibration energy can be absorbed smoothly (generally suppressed to σcr) from the moment the force starts to be applied. Therefore, even during large deformations,
The stopper 14 does not act like a hard spring, and can suppress impact on the building structure 4, and can exert sufficient restoring force to suppress repeated impacts. The stopper 14 has a structure in which these are laminated.

In this embodiment, the honeycomb member has a three-layer structure, but it goes without saying that it may have a single layer or any other number of layers.

FIG. 6 shows the shrinkage state of the honeycomb-shaped members 34a, 34b, and 34c due to buckling in response to the load P when a compressive load P in the horizontal direction is applied to the stopper 14 in FIG. As shown, honeycomb-like members 34a, 34b
, 34c are Tal, Tb from the tip side (right side in Figure 2)
It is designed to shrink sequentially like l and tel.

FIG. 7 shows the relationship between the horizontal force acting on the vibration isolator 2 and the amount of deformation of each part due to the horizontal force in this embodiment.

When the horizontal force acts, the elastic body 8 begins to deform, and then the damper 10 begins to act (δ0). After that, the stopper 14, especially the honeycomb member 3 closest to the structure
The buckling deformation action of 4a begins (δ1), and it is possible to cope with earthquakes that normally occur in this range. Further, when a horizontal force acts, other honeycomb-like members 34b, 3
4c begins to buckle (δ2, 3), and after the buckling reaches its maximum, that is, after the final control displacement of the stopper 14 is reached (δ4), the elastic body 8 reaches its limit deformation (δ5). It is something. In this way, in the event of an extremely large earthquake, the stopper 14 comes into contact with the building structure 4 in stages, absorbs vibration energy by buckling the metal honeycomb-shaped members 34a, 34b, and 34c, and prevents excessive deformation of the elastic body 8. It is designed to suppress Note that the elastic body 8 has the role of supporting the weight of the building structure 4, and if the elastic body 8 is excessively sheared and deformed, its supporting ability will decrease; however, the horizontal length of the stopper 14 By appropriately setting , excessive deformation of the elastic body 8 can be appropriately suppressed.

According to such a configuration, the stopper 14 is made up of the honeycomb-shaped members 34a, 34b, and 34c that can be buckled in the horizontal direction.
By having a function as an auxiliary damper that absorbs vibration energy in the horizontal direction, in addition to preventing relative displacement of the building structure 4 in the horizontal direction, energy absorption can be performed more reliably. In particular, the stopper 14 is made of a plurality of honeycomb-like members 34a, 34b, and 34c having different buckling strengths arranged in a row in a horizontal direction, so that energy absorption in the horizontal direction can be performed in stages. Furthermore, the damper 10 and stopper 14 of this embodiment are relatively inexpensive, and the vibration isolation effect can be reproduced by replacing them.

(Effects of the Invention) As described above, according to the present invention, when a large horizontal relative displacement occurs in a building structure due to an extremely large earthquake, the buckling behavior of the stopper, especially its gradual buckling behavior Due to the energy absorption ability, large deformation of the elastic body and its repeated action can be suppressed, and the support function of the building structure can be maintained soundly.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, and FIG. 1 is a side view thereof, FIG. 2 is a side view showing a stopper, and FIG.
The figure is an exploded perspective view of the honeycomb-like member that makes up the stopper, Figure 4 is a perspective view showing the collapse of the honeycomb-like member that makes up the stopper, and Figure 5 is the action characteristic line of the honeycomb-like member that makes up the stopper. FIG. 6 is a characteristic diagram showing the action of the stopper, and FIG. 7 is a characteristic diagram showing the action of the vibration isolator. 4... Architectural structure 6... Foundation 8... Elastic body 10... Damper 14... Stoppers 34a, 34b, 34cm -- Honeycomb shaped member Fig. 1

Claims (2)

[Claims] (1) Between the building structure and the foundation, an elastic body that supports the building structure and elastically deforms to allow horizontal relative displacement between the building structure and the foundation, and elastic deformation of the elastic body. The building structure is composed of a damper that absorbs vibration energy in the horizontal direction by mutually engaging the building structure and the foundation, and a honeycomb-shaped member that is buckled in the horizontal direction. A vibration isolation device comprising a stopper that mutually engages with the object and the foundation to absorb vibration energy in the horizontal direction while regulating horizontal displacement of the building structure. (2) The vibration isolation device according to claim 1, wherein the stopper is constructed by horizontally arranging a plurality of honeycomb-shaped members having different buckling strengths in a layered manner.