JPS60226971A - Support apparatus structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a support device for a structure, and particularly to a high-damping seismic isolation support device for a structure suitable for preventing excessive relative displacement of a heavy structure. It is something.

[Background of the invention]

When installing a heavy structure on a foundation on the ground, several or thousands of seismic isolation supports are installed between the floor of the structure and the support set on the top of the foundation on the ground. Install the device and
The structure is made to withstand earthquakes.

As this seismic isolation support device, for example, JP-A-51-12
As described in Japanese Patent No. 2738, there is a damper that uses hysteresis such as plastic deformation of lead or friction (hereinafter referred to as a hysteresis damper). However, in such a structure, if the resistance of the damping mechanism is increased in order to suppress excessive relative displacement, the activation start acceleration of the support device will increase, so the structure will be subject to a large earthquake by the time the seismic isolation support device is activated. energy is transferred. In addition, since the resistance of the damping mechanism is large, when the direction changes,
The frequency components higher than the natural frequency of the base isolation structure become large. Furthermore, even after the earthquake ends, the structure will be difficult to return to its original position.

[Purpose of the invention]

An object of the present invention is to provide a highly reliable and highly damped support device for a structure that prevents excessive relative displacement.

[Summary of the invention]

In order to achieve this objective, the seismic isolation support device for a structure of the present invention provides a structure between the structure and the foundation on which this structure is installed.
An elastic member such as laminated rubber is provided, and a damping mechanism using a hysteresis technique such as an elastic-plastic material such as lead or a plastic material or a friction material and a speed-dependent damping mechanism such as a viscous damper are connected in series to this elastic member. It is characterized by being constructed by arranging the parts arranged in parallel.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure supporting device of the present invention will be described below with reference to FIGS. 1 and 2. The structure 1, which is a heavy object, is installed on a plurality of support stands 3a provided on the upper surface of a foundation 3 on the ground 2, with support devices 4 interposed therebetween. This support device 4 is a seismic isolation support device, and allows the structure 1 to withstand vibrations such as earthquakes. FIG. 2 is a longitudinal cross-sectional view showing a specific structure of the above-mentioned support device 4. As shown in FIG.

Between the floor of the structure 1 and the support base 3a, the upper part of a hysteresis damper 5 made of lead or the like is attached as a damping mechanism using hysteresis by a mounting plate 6.

A lower portion of the hysteresis damper 5 is coupled to, for example, a viscous damper 7 as a speed-dependent damping mechanism. This viscous damper 7 is an improved version of the conventional damper for use in a seismic isolation support device.

The viscous damper 7 is composed of primary parts. That is, there is a support plate 8 that supports the lower part of the hysteresis damper 5, a shaft 9 is coupled to the lower surface of the support plate 8, and several discs 10 and a lowermost disc 11 are attached to this shaft 9. has been done. Further, a plurality of ring engravings 13 attached to a frame 12 around the viscous damper 7 are alternately inserted between the support plate 8 and the disk 10. Between the support plate 8- and the ring engraving 13, as well as between the respective discs 10 and the ring engravings 13, there are several sliding bearings 14 for making the gap constant and maintaining the parallelism thereof. is attached to the surface of the Also, between the lowest disc 11 and the bottom plate 16, several slide bearings 15 are installed in the lowest circle to maintain a constant gap and support the weight of the movable parts of the hysteresis damper 5 and the viscous damper 7. It is attached to the plate 11. Since the viscous damper 7 has such a structure, the movable part of the viscous damper 7 that supports the hysteresis damper 5 can move within the central space of the ring engraving 13 in the horizontal plane. . The inside of the viscous material damper 7 is filled with a highly viscous material 17. And this viscous damper 7
is installed on the support stand 3a.

Next, the operating principle of the viscous damper 7 will be explained.

The present viscous material damper 7 utilizes the viscous shear resistance of the highly viscous material 17. That is, when two parallel surfaces move relative to each other parallel to each other, a shearing force is generated due to the viscous body interposed between the two surfaces.

In the present viscous damper 7, the two parallel surfaces are each disk 10 (or 8.11) and the adjacent ring engraving 13. The viscous shear resistance force of the present viscous damper 7 is:
When the viscosity of the viscous body, the temperature, and the gap between the two parallel surfaces are constant, it increases as the relative velocity increases, and as the shear area of the two parallel surfaces and the number of laminated disks 10 and ring engravings 13 increase. Therefore, in the range where the viscous resistance force of the viscous damper 7 is smaller than the resistance force of the hysteresis damper 5 (for example, yield force of lead, frictional force of a friction damper), the hysteresis damper 5 does not operate, but the viscous damper 7 When the relative speed between the disk lO, etc. of the movable part and the ring cedar plate 13, etc. increases, the viscous resistance of the viscous damper 7 becomes larger, so the movable part of the viscous damper 7 is restrained ( so-called hydronic lock), hysteresis damper 5
is activated. In addition, the support body 89 of the viscous damper 7 and the disc 1
0.11, the size of the ring engraving 13, and the number of layers to be stacked are determined from the set resistance force of the hysteresis damper 5 and the response relative speed of the seismic isolation vibration system.

Further, between the floor of the structure 1 and the support base 3a, for example, a laminated rubber 18 is disposed as an elastic member so as to surround the above-mentioned hysteresis damper 5 and viscous damper 7. This laminated rubber 18 is constructed by, for example, laminating several rubber plates reinforced by a plurality of iron plates.

Next, the overall working principle of the present invention is as follows.

Due to the earthquake input, the laminated rubber 18 initially begins to deform vibrably. At this time, the viscous damper 7 has a group of disks (8,
10, 11) Since the relative speed with the taking engraving 13 is small, it exhibits the effect of an oil damper. When the relative speed exceeds a certain value, the hysteresis damper 5 operates due to hydronic lock.

In this way, since the resistance force (damping force) of the hysteresis damper 5 is increased, large seismic energy is prevented from being transmitted to the structure 1, and changes in the hysteresis of the hysteresis damper 5 are not sudden, so that the structure 1
It is possible to alleviate the induction of high vibration components that have an adverse effect on the Furthermore, once the earthquake ends, the resistance force of the viscous damper 7 becomes smaller, so even if residual deformation remains in the hysteresis damper 5, if the residual deformation is within the movement range of the movable part of the viscous damper 7, .

The structure 1 can be returned to its original position.

In addition, a sliding plate is interposed between the upper part of the laminated rubber 18 and the hysteresis damper 5 and the lower part of the structure 1, so that
Even in the event of a super-large earthquake that deforms the laminated rubber 18 and hysteresis damper 5 by more than the allowable displacement, the laminated rubber 18 and hysteresis damper 5 will deform due to the structure 1 slipping.
can also be protected. Furthermore, in order to prevent the seismic isolation support device from operating due to small earthquakes or wind, and to disperse the resistance force of the hysteresis damper 5, it is necessary to Laminated rubber with a plug pressed into it may be used.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent excessive relative displacement and provide a highly attenuated seismic isolation support device for a highly reliable structure.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view illustrating an example of a support device for a structure according to the present invention, and FIG. 2 is a longitudinal sectional view showing an example of the support device in FIG. 1. 1... Structure, 2... Ground, 3... Foundation, 4...
- Support device, 5... Hysteresis damper, 7... Viscous damper, 8... Support plate, 9... Shaft, 10...
Disc, 11... Bottom disc, 12... Frame, 13...
・Ring engraving, 14, 15..., sliding bearing, 16・
...Bottom plate, 17...high viscosity material. Agent Patent Attorney Akio Takahashi No. 1 (2)

Claims (1)

[Claims] In a support device for a structure interposed between a structure and a foundation on which the structure is installed, an elastic member is disposed between the structure and the foundation, and the elastic member is provided with damping using hysteresis. A support device for a structure, characterized in that it is constructed by arranging a mechanism and a speed-dependent damping mechanism in series in parallel.