JPH0658008A - Three-dimensional seismic isolation device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a three-dimensional seismic isolation device capable of damping vibrations in the vertical direction as well as in the horizontal direction and exhibiting a seismic isolation effect in the vertical direction. [Structure] In order to make the seismic isolation device 1 compact, the enclosed lead core 6 is formed into a substantially drum shape so that effective damping can be obtained both vertically and vertically. That is, conventionally, the cylindrical lead enclosed in the central portion of the laminated rubber portion 4 undergoes shear deformation (horizontal deformation) integrally with the surrounding laminated rubber, so that horizontal damping is obtained by the superplastic characteristic of lead. .
Therefore, in the present invention, by making the cylindrical lead core 6 into a drum shape, the joining effect between the periphery of the lead core and the laminated rubber portion 4 is maintained against the vibration in the vertical direction while maintaining the horizontal damping property. , The lead core 6 is also deformable in the vertical direction to obtain damping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended for building structures, civil engineering structures, and equipment, and from the viewpoint of improving their seismic resistance and economically rationalizing, a seismic isolation device that supports the structure. It is about.

[0002]

2. Description of the Related Art Conventionally, a seismic isolation device of this type, that is, a seismic isolation device used as a support device for an entire building or a bridge girder, is constructed by stacking a plurality of rubber plates with plates interposed therebetween. There is a rubber part in which various dampers are combined to support the laminated rubber part.

Various proposals have been made for this damper, and typical examples thereof include those using steel materials of various shapes, those using a viscous material of a polymer compound, and those containing lead ( Those treated as lead alone) are known.

There is also a high damping laminated rubber device in which a plain rubber is combined with a high damping agent so that the rubber itself has a damper function.

[0005]

However, most of the conventional seismic isolation devices, such as the above-described conventional seismic isolation devices, are intended for horizontal earthquakes, and are not limited to the horizontal direction. There are few cases where earthquakes in the same direction were targeted.

[0006] The reason why there are few cases in which the vertical earthquake is also applied is that the vertical earthquake resistance is not so necessary as a structure. In addition, if the vertical direction is seismic-isolated, the response behavior of the structure becomes complicated by coupling with the horizontal earthquake (rocking occurs).

Furthermore, as a hardware technique, it is difficult to develop a vertical seismic isolation device because it is difficult to make a damper in a small deformation range, and at the same time, horizontal followability is required. Moreover, if the dampers are provided in the vertical direction, the seismic isolation layer space below the structure becomes congested, which causes various absurdities in terms of design, construction, and maintenance.

Because of this, there are few cases where vertical earthquakes are also targeted. On the other hand, in recent years,
In particular, from the viewpoint of improving the earthquake resistance of important equipment contained in a building, seismic isolation requirements in the vertical direction as well as in the horizontal direction are increasing.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to be capable of damping vibrations in the vertical direction as well as in the horizontal direction, and exhibiting a seismic isolation effect also in the vertical direction. It is to provide a three-dimensional seismic isolation device that can.

[0010]

According to the three-dimensional seismic isolation device of the present invention, in order to make the seismic isolation device compact, the conventional lead-containing laminated rubber device (for horizontal seismic isolation) is improved. In addition, the enclosed lead core is formed into a substantially drum shape so that effective damping can be obtained both vertically and vertically.

More specifically, in the conventional lead-containing laminated rubber device, as shown in FIG. 6, a cylindrical lead core 6 enclosed in the center of the laminated rubber portion 4 is sheared integrally with the surrounding laminated rubber portion 4. By (horizontal deformation), the damping in the horizontal direction was obtained due to the superplasticity characteristics of the lead core 6.

Therefore, in the present invention, the cylindrical lead core is formed in a drum shape as shown in FIG. 1 so that the periphery of the lead core and the laminated rubber are maintained while maintaining the conventional horizontal damping property. Due to the joining effect, the lead core is deformed in the vertical direction with respect to the vertical vibration, and damping can be obtained.

In the case of vertical seismic isolation, it is necessary to thicken each rubber layer of the device to soften it vertically (4-5).
Hz).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The three-dimensional seismic isolation device of the present invention will be described below with reference to the illustrated embodiments.

The three-dimensional seismic isolation device 1 (see FIG. 1) has a laminated rubber portion 4 in which a plurality of rubber plates 2 are vertically stacked with a plate 3 interposed therebetween, and the laminated rubber portion 4 is sandwiched between the laminated rubber portions 4. The upper and lower flanges 5, 5 are connected to each other, and at least one lead core 6 is provided so as to pass through the laminated rubber portion 4 in the vertical direction.

The lead core 6 is formed in a so-called substantially drum shape in which the central portion of the cylindrical shape has a small diameter.
It is configured to be deformable in the vertical direction as well as the horizontal direction.

Next, the damping state of vertical vibrations when the three-dimensional seismic isolation device 1 having such a structure is used will be described, and in the present invention, a numerical calculation design method has been established in the world. Since it has not been done, it is necessary to investigate the characteristics by experiments and establish the design method for future implementation. 2 and 3 show vertical force test data of a conventional lead-containing laminated rubber device (for horizontal seismic isolation).

According to this, the attenuation seems to be about 5 to 7%.

FIG. 4 shows another embodiment of the three-dimensional seismic isolation device 1 of the present invention. Here, a plurality of lead cores 6 are provided and distributed over the entire device surface so that the stress displacement in the vertical direction is evenly distributed over the entire device.

Further, as the three-dimensional seismic isolation device 1 of the present invention, in order to enhance the connectivity of the lead core 6 at the upper and lower ends (contact surface with the flange) of the device, a mode as shown in FIG. 5 is also conceivable. .

[0021]

According to the present invention, it is possible to provide a so-called three-dimensional seismic isolation device having a very simple shape, which is effective for damping horizontal and vertical vibrations. Also,
As all the functions of the seismic isolation device are integrated, the layout is improved.

Furthermore, it is not affected by environmental weather conditions.
In addition, the rational design of the supported structure against earthquakes in all directions becomes possible.

[Brief description of drawings]

FIG. 1 is a schematic view showing a three-dimensional seismic isolation device of the present invention.

FIG. 2 is a graph showing vertical force test data in a conventional lead-containing laminated rubber device (for horizontal seismic isolation).

FIG. 3 is a graph showing vertical force test data in a conventional lead-containing laminated rubber device (for horizontal seismic isolation).

FIG. 4 is a schematic view showing another embodiment of the present invention.

FIG. 5 is a schematic view showing another embodiment of the present invention.

FIG. 6 is a schematic view showing a conventional seismic isolation device.

[Explanation of symbols]

1 ... Three-dimensional seismic isolation device, 2 ... Rubber plate, 3 ... Plate, 4 ...
Laminated rubber part, 5 ... Flange, 6 ... Lead core.

Claims (1)

[Claims] 1. A laminated rubber portion in which a plurality of rubber plates are vertically stacked with a plate interposed therebetween and upper and lower flanges sandwiching the laminated rubber portion are connected to each other, and the inside of the laminated rubber portion is vertically moved. It is a seismic isolation device consisting of at least one lead core arranged in a state of penetrating in the direction, wherein the lead core is in a state where the central portion of the columnar shape has a small diameter,
A three-dimensional seismic isolation device, which is formed in a so-called substantially drum shape and is configured to be able to be deformed integrally with a laminated rubber in contact with the surroundings in the vertical direction as well as in the horizontal direction.