JPH07269162A - Damper of base isolation device for building - Google Patents

Abstract

PURPOSE:To prevent the breakage of a damper body before absorption of sufficient vibrational energy. CONSTITUTION:A damper of base isolation device for a building is made up of a bar-shaped damper body 3, a support 1 on the building side for supporting the upper end of the damper body 3, and a support 2 on the ground side for supporting the lower end of the damper body 3. At least either of the supports of the damper body 3 out of the building side support 1 and the ground side support 2 is made movable in the vertical direction, and the energy for relatively moving the building side support 1 and the ground side support 2 in the horizontal direction is absorbed by utilizing the plastic deformation in the mode of bending of the damper body 3. In the damper of base isolation device for a building thus constituted, the diameters of the damper body 3 being supported by these supports so as to be vertically movable are made larger than the diameter therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a seismic isolation device for buildings, which has durability and reliability against repeated deformation and which absorbs vibration energy such as an earthquake.

[0002]

2. Description of the Related Art As a damper of this type of building seismic isolation device, for example, there is one shown in FIG. 3, and this damper is formed in a rod shape having a constant diameter as shown in FIG. A damper main body 9, a building-side receiving body 1 that supports the upper end portion of the damper main body 9 so that it can move only vertically, and a ground-side receiving body 2 that supports the lower end portion of the damper main body 9. is there.

Therefore, in this structure, as shown by the alternate long and two short dashes line in FIG. 3, when the vibration for relatively moving the building-side receiving body 1 and the ground-side receiving body 2 in the horizontal direction occurs, the damper main body 9 bends. By repeating the plastic deformation of the above mode, the vibration energy is absorbed.

The damper main body 9 is plastically deformed to absorb vibration energy, and the receiving bodies 1 and 2 support both ends of the damper without being plastically deformed. The bodies 1 and 2 are made of a material harder than the damper main body 9.

However, since the material of this damper is set as described above, the above-mentioned position of the damper main body 9 is abraded by sliding between the building-side receiver 1 and the supporting portion of the damper main body 9 and its vicinity. I will end up. Further, since the worn portion becomes a plastically deformed portion, there is a problem that the damper main body 9 is broken before the vibration energy is sufficiently absorbed.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a damper for a building seismic isolation device in which the damper main body is not broken before the vibration energy is sufficiently absorbed.

[0007]

According to the present invention, a damper main body 3 formed in a rod shape, a building-side receiver 1 for supporting an upper end portion of the damper main body 3, and a lower end portion of the damper main body 3 are provided. The building-side receiving body 2 is supported, and at least one of the support of the damper main body 3 by the building-side / ground-side receiving bodies 1 and 2 is movable up and down. Damper for a building seismic isolation device of a type that absorbs energy of vibration caused by relative movement of the side receiving body 1 and the ground side receiving body 2 in the horizontal direction by utilizing plastic deformation in which the damper main body 3 bends In the above, the thickness of the damper main body 3 portion which is supported by the receiving body so as to be movable up and down is set to be larger than that between these mutual portions. In addition, it is preferable that the stepped portion of the damper main body 3 is formed to have an R-shaped cross section.

[0008]

The present invention operates as follows.

When the building-side receiving body 1 and the ground-side receiving body 2 are subjected to vibrations that relatively move them in the horizontal direction, at least one of the upper and lower ends of the damper main body 3 portion moves up and down with respect to the receiving body. The damper main body 3 repeats bending while moving. However, since the thickness of the damper main body 3 part which is supported by the receiving body so as to be movable up and down is set to be larger than that of these mutual parts, the wear position, which is the supporting portion of the damper main body 3 by the receiving body, is set. And the portions between the supporting portions of the damper main body 3 which are elastic plastic parts are different from each other, and as a result, the damper main body 9 is bent before absorbing the vibration energy sufficiently as described in the conventional column. The situation will not occur.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described with reference to the drawings shown as embodiments.

As shown in FIG. 1, the seismic isolation device for a building of this embodiment has a damper main body 3 formed in the shape of a round bar, and a construction in which an upper end portion of the damper main body 3 is vertically movably supported. It comprises an object-side receiver 1 and a ground-side receiver 2 which supports the lower end of the damper main body 3.

The building-side receiving body 1 is made of steel as a whole, and as shown in FIG. 1, a cylindrical main body 10 having a fixing portion 11 for mounting on the building side,
The main body 10 is composed of a ring-shaped support tool 12 fixedly arranged on the inner collecting surface.

The ground-side receiving body 2 is made of steel as a whole like the building-side receiving body 1, and as shown in FIG. 1, a cylinder having a fixing portion 21 for mounting on the ground side. The main body 20 is shaped like a ring, and the ring-shaped support 22 is fixedly arranged on the inner peripheral surface of the main body 20.

The steel materials of the receiving members 1 and 2 are made of a material harder than that of the damper main body 3, and the supporting tools 12 and 22 of the supporting members 1 and 2 are formed with an inner peripheral portion having an R-shaped cross section. is there.

As shown in FIG. 1, the damper main body 3 includes upper and lower large-diameter portions 30 supported by the building-side receiving body 1 and the ground-side receiving body 2, and between the large-diameter portions 30 and 30. And a small diameter portion 31 of As shown in FIG. 1, the connecting portion 32 between the large-diameter portion 30 and the small-diameter portion 31 is formed to have an R-shaped cross section so that an excessive concentrated load is not generated in the connecting portion 32. is there.

Since the damper of the seismic isolation device for a building according to this embodiment is constructed as described above, as shown in FIG. 2, the wear position 33, which is the support portion of the damper main body 3 by the receiving body, and the elastic position. The positions of the connecting portion 32 of the damper main body 3 that becomes the plastic portion 34 and the vicinity thereof will be different. Therefore, unlike the case described in the conventional column, the situation in which the damper main body 3 is broken before the vibration is sufficiently absorbed does not occur.

In the damper main body 3 of the above embodiment, the large diameter portion 30 is provided vertically, but the large diameter portion 30 may be provided only on the side supported by the building-side receiving body 1. Good. In short, the building side / ground side receiving body 1,
At least one of the supports of the damper main body 3 by 2 is movable up and down, and the thickness of the damper main body 3 part supported by the receiving body so as to be movable up and down is set to be larger than that between these mutual parts. It is all right.

[0018]

The present invention having the above-mentioned structure has the following effects.

From the contents described in the above-mentioned action column, it is possible to provide a damper for a seismic isolation device for a building in which the main body of the damper is not broken before the vibration is sufficiently absorbed.

[Brief description of drawings]

FIG. 1 is a sectional view of a damper of a seismic isolation device for a building according to an embodiment of the present invention.

[Fig. 2] Structure side of the damper of the seismic isolation device for the structure
The figure which shows the state of a damper main body when the ground side receivers mutually move horizontally.

FIG. 3 is a cross-sectional view of a damper of a conventional seismic isolation device for a building, showing a state of a damper main body when the building-side and ground-side receiving bodies relatively move in a horizontal direction.

[Explanation of symbols]

 1 Building side receiving body 2 Ground side receiving body 3 Mainly damper

Claims (2)

[Claims] 1. A damper main body (3) formed in a rod shape.
And a building-side receiving body (1) that supports the upper end of the damper main body (3) and a ground-side receiving body (2) that supports the lower end of the damper main body (3). In addition, at least one of the support of the damper main body (3) by the building side / ground side receiving bodies (1) and (2) is vertically movable, and the building side receiving body (1) and In a damper of a seismic isolation device for a structure of a type that absorbs vibration energy for horizontally moving the ground-side receiving body (2) by utilizing plastic deformation in a mode in which the damper main body (3) bends, A damper for a seismic isolation device for a building, characterized in that a thickness of a damper main body (3) supported so as to be movable up and down by a body is set to be larger than that of these mutual parts. 2. The damper for a seismic isolation device for a building according to claim 1, wherein the stepped portion of the damper main body (3) is formed in a cross-section R shape.