JPH0452384A - Isolating device for vibration of building - 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] (Industrial application field) The present invention relates to a seismic isolation device for buildings.

(Prior art) Figures 4 and 5 show a seismic isolation member used in a conventional seismic isolation device, in which metal member pieces (a) and elastic member pieces) are alternately laminated. It is constructed by fitting a lead pillar (C) into the center. The seismic isolation member configured as described above is attached between the foundation and superstructure of the building via attachment members (a) disposed on the upper and lower surfaces thereof.

(e) in the figure is a mounting hole provided in the mounting member (d).

When arranging the seismic isolation members, the size of the laminate and the diameter of the lead column may be adjusted depending on the absorbed energy at the installation location of the seismic isolation device, or the support position may be adjusted to improve the center of gravity of the superstructure. The position of the center of gravity of the seismic isolation device is aligned with the center of gravity of the seismic isolation device to reduce the vibration of the building during an earthquake. This prevents the floor from twisting due to mismatch between the center of gravity and the center of gravity, which is the point of action of inertial force.

(Issue 1 to be solved by the invention!! However, the conventional seismic isolation device described above is effective in the case of relatively simple buildings with uniform stress characteristics, but it is effective for buildings with irregular shapes and stress characteristics. This becomes a problem in the case of non-uniform buildings.

In other words, when designing a seismic isolation device for a building, the center of gravity is calculated by stress analysis in advance, and the seismic isolation device is installed so that the center of gravity of the device matches or is close to the center of gravity. When a building is irregularly shaped and has non-uniform stress characteristics, the amount of displacement between the center of gravity and the center of gravity increases compared to the original design due to unexpected stress acting on the building.
When this amount of displacement becomes large, rotational vibration occurs due to wobbling, and effective hysteresis characteristics cannot be exhibited during horizontal deformation, and an attempt to control this requires a separate damper device.

In addition, the size of the seismic isolation device increases according to the scale of the building, and the diameter of the lead pillar installed in the center of the seismic isolation member increases, so it is effective against some earthquakes, but it is effective against small-scale earthquakes. Micro-vibrations cannot absorb enough energy, and a seismic isolation effect cannot be expected.

In order to design a seismic isolation device that is responsive to the installation location and absorbed energy, it is necessary to adjust the diameter of the lead column in the center of the seismic isolation member, adjust the size of the laminated part, and use various methods to adjust the absorbed energy. A seismic isolation member of the size will be manufactured. For this purpose, a large amount of cost is required for the manufacturing mold, and as it is necessary to install seismic isolation members of a somewhat standardized size, the design range becomes rough and it becomes difficult to design the seismic isolation structure. There was a problem.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to configure a seismic isolation device with characteristics tailored to each condition in accordance with the placement position of the seismic isolation device. The object of the present invention is to provide a seismic isolation device for a building that can rationalize the seismic isolation structure design and improve the seismic isolation effect by providing each seismic isolation member alone.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the seismic isolation device for a building according to the present invention is provided on the concentric circumference of a laminate made of alternately layered metal pieces and elastic pieces. A seismic isolation member consisting of a plurality of cavities for fitting lead columns is interposed between the building foundation and the superstructure along the It is constructed by adjusting the number of lead columns fitted into the cavity of the member.

(Function) As described above, the present invention provides a seismic isolation member interposed between a foundation and a superstructure of a building, along the concentric circumference of a laminate of metal pieces and elastic pieces. Since multiple cavities for fitting lead columns are provided, the number of lead columns fitted in the cavities of each seismic isolation member is adjusted according to the absorbed energy, and the number of seismic isolation members configured by the same group of seismic isolation members is adjusted. By aligning the center of gravity of the device with the center of gravity of the superstructure, rotational vibrations caused by torsion of floors during earthquakes are suppressed, and the seismic isolation device takes advantage of its historical characteristics to achieve a seismic isolation effect. It is possible.

Furthermore, since the lead columns fitted into the seismic isolation member are fitted into a plurality of cavities provided on the concentric circumference of the same member,
When the cross section of a lead column becomes smaller and horizontal deformation occurs in the seismic isolation device during an earthquake, bending deformation is added in addition to shear deformation, and even in the event of a small earthquake, energy can be absorbed and attenuated over a long period.

(Example) The present invention will be described below with reference to the illustrated embodiments.

In Figures 1 and 2, the reference character indicates a seismic isolation member, which is the concentric circumference of a laminate made by alternately layering metal pieces ( ) such as rope plates and elastic pieces (2) such as rubber. Along the top, a plurality of vertical lead column fitting cavities (3) are arranged, and depending on the absorbed energy of the installation position of the seismic isolation member, the required cavity (3) among the cavities (3) group is arranged. A lead pole (4) is fitted in the top.

Although Fig. 2 shows a seismic isolation member consisting of three lead columns (4) and three cavities (3), the seismic isolation member used in the present invention is limited to this number. isn't it.

In the figure, (5) is a mounting plate disposed above and below the laminate.

Figure 3 shows a case where the present invention is applied to a building with an irregular shape in plan view, in which the seismic isolation member is installed directly under the pillar (6) through the upper and lower mounting plates (5) to connect the foundation and upper part. It is placed between the structure.

The number of the seismic isolation members (4) is adjusted according to the absorbed energy of each company (6) position according to the seismic isolation design of the building, and in the illustrated embodiment, the seismic isolation members (A,) (A2)
and (A,), the number of lead columns (4) is reduced, and the remaining seismic isolation members ^ are reduced to three lead columns (4) shown in Figures 1 and 2.
) is arranged, and the center of gravity G of the superstructure is
The position of the base isolation position and the position of the center of gravity R of the seismic isolation position match or are configured to be close to each other.

In addition, the seismic isolation members are fitted with lead columns (4) in the required cavities (3) according to the absorbed energy of the installation location, and are installed between the upper structure and the foundation of the building. Since the lead column (4) becomes thinner and the upper structure vibrates, horizontal deformation occurs in the seismic isolation device, bending deformation will be added in addition to shear deformation. , even in the event of a small earthquake, it absorbs energy over a long period and exhibits a damping effect.

(Effects of the Invention) As described above, in the building seismic isolation device according to the present invention, the
A laminate consisting of alternating layers of metal pieces and elastic pieces,
By arranging multiple cavities for fitting lead columns along concentric circles and adjusting the number of lead columns fitted in the cavities according to the absorbed energy, the center of gravity of the superstructure and the seismic isolation system can be adjusted. By making the center of gravity 1 coincide with or close to the center of gravity 1, each seismic isolation member can utilize its hysteresis characteristics to attenuate vibration energy and exhibit a damper effect during an earthquake.

Furthermore, when the upper structure vibrates and horizontal displacement occurs in the seismic isolation member, the member undergoes bending deformation in addition to shearing deformation, and the seismic isolation effect is exerted even in the event of a small earthquake.

[Brief explanation of the drawing]

1 is a vertical sectional view of a seismic isolation member used in a seismic isolation device according to the present invention, a view taken along the arrow 1-I in FIG. 2, a cross-sectional plan view of the seismic isolation member, and a The figure is a plan view in which the seismic isolation device according to the present invention is applied to a building with an irregular planar surface, Fig. 4 is a perspective view showing a conventional seismic isolation member with a part cut away, and Fig. 5 is the same. FIG. Prisoner...Seismic isolation member, (1)...Metal piece, (
2)...Elastic piece, (3)...Cavity for fitting lead column, (4)...Lead column. Agent: Patent attorney Shige Okamoto (1 person)

Claims (1)

[Claims] A seismic isolation member constructed by arranging a plurality of cavities for fitting lead columns along the concentric circumference of a laminate made of alternating layers of metal pieces and elastic pieces is installed at the foundation of a building. 1. A seismic isolation device for a building, characterized in that the number of lead columns interposed between the seismic isolation member and a superstructure is adjusted according to the absorbed energy.