JP2001303794A - Base isolation building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation building capable of improving an effective utilization factor of a space more than usual, capable of reducing a cost and capable of improving workability. SOLUTION: An upper structure 4 is supported by a column 3 erected from a lower structure 2. The column 3 is formed so that the horizontal rigidity becomes smaller than the upper structure 4. A damper 10 for damping horizontal vibration of the upper structure 4 is interposed between the upper structure 4 and an underground outer wall 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation building constructed to reduce the input of seismic force.

[0002]

2. Description of the Related Art As a seismic isolation building of this type, an insulating material such as laminated rubber is interposed between a lower structure and an upper structure so that seismic force is not transmitted to the upper structure. It has been known.

[0003]

However, in such a base-isolated building, there is a problem that a space for arranging the insulating material is required, so that an effective utilization rate of the space is reduced. In addition, the cost of the laminated rubber and the like increases, and it is necessary to form the upper structure while supporting the insulating material.

[0004] The present invention has been made in view of the above circumstances, and can improve the effective utilization rate of space, reduce costs, and improve workability as compared with the related art. The task is to provide seismically isolated buildings that can be planned.

[0005]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
In the invention according to claim 1, the upper structure is supported by a pillar standing upright from the lower structure, and the pillar is formed so that its horizontal rigidity is smaller than that of the upper structure. A damper for damping horizontal vibration of the upper structure is interposed between the ground and the ground.

[0006] With such a configuration, the columns can function as seismic isolation materials, and seismic energy input to the upper structure can be reduced without using an insulating material such as laminated rubber.

According to a second aspect of the present invention, there is provided the seismic isolation building according to the first aspect, wherein the pillar is formed of high-tensile steel.

With such a configuration, the horizontal rigidity can be reduced by reducing the outer diameter of the column while securing the supporting force of the column.

The invention described in claim 3 is the first or second invention.
2. The seismic isolation building according to claim 1, wherein the lower structure includes a foundation pile installed in the ground, and the pillar is erected directly on a pile head of the foundation pile.

[0010] With this configuration, during construction,
The floor slab supported by the columns can be used as a gantry.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a main part of a base-isolated building 1 according to an embodiment of the present invention. The seismic isolation building 1 has a configuration in which an upper structure 4 is supported by columns 3 erected from a lower structure 2.

The lower structure 2 includes a foundation pile 5 and an underground skeleton 6 supported by the foundation pile 5. In addition, the pillar 3 is formed as a straight pillar that stands directly on the pile head 5 a of the foundation pile 5. The column 3 is formed of high-strength steel, and has an outer diameter smaller than that of the column 7 constituting the upper structure 4. As a result, the horizontal rigidity of the column 3 is made smaller than that of the upper structure 4.

Further, an underground outer wall 9 constituting the underground frame 6
A damper 10 is interposed between the upper end portion 9a of the first member and the upper structure 4. As this damper 10, for example,
A viscous damper such as an oil damper, a viscoelastic damper using rubber asphalt, or a hysteretic damper such as a friction damper is used.

In such a base-isolated building 1, since the horizontal rigidity of the column 3 is smaller than that of the upper structure 4, the column 3 acts as a base-isolated layer when seismic force acts. As a result, the input of seismic energy to the upper structure 4 can be reduced.

In this case, the seismic energy input to the upper structure 4 is absorbed by the damper 10 provided between the upper structure 4 and the underground outer wall 9, whereby the safety of the upper structure 4 at the time of the earthquake is provided. Nature is secured.

In the seismic isolation building 1 described above, the columns 3 erected from the lower structure 2 to support the upper structure 4 are formed so that the horizontal rigidity thereof is smaller than that of the upper structure 4. In addition, since the damper 10 is interposed between the upper structure 4 and the underground outer wall 9 fixed to the ground G (see FIG. 1), the column 3 can function as a seismic isolation layer. Accordingly, seismic energy input to the upper structure 4 can be reduced without using an insulating material such as a laminated rubber. Therefore, unlike the conventional case, the effective utilization rate of the space does not decrease due to the installation of the seismic isolation layer. Further, since the cost for the laminated rubber and the like can be reduced, the construction cost can be reduced.

Further, in the above-mentioned seismic isolation building 1, since the columns 3 are formed of high-tensile steel, the horizontal rigidity is reduced by reducing the outer diameter of the columns 3 while securing the supporting force of the columns 3. It is possible for the pillar 3 to exhibit the function of the seismic isolation layer satisfactorily.

In the above-described seismic isolation building 1, the columns 3
Since the first floor slab 11 (see FIG. 1) is pre-constructed at the time of the construction of the underground skeleton 6 or the like, the first floor slab 11 is used as a gantry. It is possible to improve the workability. In this case, it is preferable that the first floor slab 11 and the retaining wall provided on the outer periphery of the underground skeleton 6 are temporarily connected by a jack or the like.

[0019]

As described above, in the base-isolated building according to the first aspect, the column erected from the lower structure to support the upper structure has a lower horizontal rigidity than the upper structure. And a damper is interposed between the upper structure and the ground, so that the column can function as a seismic isolation layer, thereby providing an insulating material such as laminated rubber. Without using, the seismic energy input to the superstructure can be reduced. Therefore, unlike the conventional case, the effective utilization rate of the space does not decrease due to the installation of the seismic isolation layer. Further, since the cost for the laminated rubber and the like can be reduced, the construction cost can be reduced.

In the base-isolated building according to the second aspect, since the columns are formed of high-strength steel, the horizontal rigidity is reduced by reducing the outer diameter of the columns while securing the supporting force of the columns. It is possible for the column to exhibit the function of the seismic isolation layer well. As a result, the invention of claim 1 can be favorably realized.

According to the seismic isolation building of the third aspect, since the pillars are erected directly on the pile heads of the foundation piles, the floor slab is supported by the pillars during the construction of the underground skeleton, etc. In this case, the floor slab can be used as a gantry, thereby improving workability.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a building, schematically showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Substructure 3 Column 4 Superstructure 5 Foundation pile 5a Pile head 10 Damper G Ground

Claims (3)

[Claims] 1. An upper structure is supported by a column erected from a lower structure, and the column is formed so that its horizontal rigidity is smaller than that of the upper structure. A seismic isolation building, wherein a damper for damping horizontal vibrations of the upper structure is interposed between the buildings. 2. The seismic isolation building according to claim 1, wherein said pillar is formed of high-strength steel. 3. The seismic isolation building according to claim 1, wherein the lower structure includes a foundation pile installed in the ground, and the pillar stands directly on a pile head of the foundation pile. Seismic isolation building characterized by being established.