JPH05295926A - Base isolation device for light-weight building - Google Patents

Abstract

PURPOSE:To provide a base isolation material which is rigid in vertical direction and less in rigid in horizontal direction by providing a thin holding layer on the inner surface of a cylindrical base isolation member in which reinforcement plates and elastic rubber layers are laminated alternately, filling a low elastic member in it, and deforming it integrally according to a deformation of the base isolation member in horizontal direction. CONSTITUTION:A base isolation material 2 provided between a base and a building is formed cylindrically by laminating and sticking reinforcing plates 20 and elastic rubber layers 21 alternately. Then a thin holding layer 3 which is deformed integrally according to a deformation in horizontal direction is provided on the inner surface of the material 2. Also the holding layer 3 is formed with rubber, plastic, etc., which is lower in elasticity than the elastic rubber layers 21. In addition, a low elastic member 4 formed with butadiene rubber, etc., is filled in the holding layer 3. Then a specified rigidity in vertical direction is secured, and a rigidity in horizontal direction is more reduced. Thus a base isolation material suitable for light-weight building can be obtained easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for lightweight buildings.

[0002]

2. Description of the Related Art A seismic isolation device of this type has already been filed in Japanese Patent Application No. 2-158965. As shown in FIG. 9, this seismic isolation device is formed by alternately stacking upper and lower mounting plates 1, 1, an annular reinforcing plate 20 and an annular elastic rubber layer 21, and between the mounting plates 1, 1. Seismic isolation material 2 installed in
And a central through hole 22 constituted by the inner peripheral portion of the reinforcing plate 20 and the elastic rubber layer 21, and a low-hardness low elastic member 3 filled in the central through hole 22, By changing the material of the low elastic member 3 (changing to a material having a different elastic coefficient), the horizontal rigidity can be changed without largely changing the vertical rigidity.

In the seismic isolation device having this structure, if the central through hole 22 is filled with the low elastic member 3 having a small elastic modulus, a seismic isolation device having a small horizontal rigidity can be manufactured while ensuring a certain vertical rigidity. It can be used for lightweight construction. However, in the seismic isolation device having the above-described configuration, since the seismic isolation material 2 itself has a certain level of horizontal rigidity, there is a limit to reducing the overall horizontal rigidity by merely changing the material of the low-elasticity member 3.

Therefore, as one means for further reducing the horizontal rigidity without changing the above basic structure, the horizontal rigidity of the seismic isolation material 2 itself is reduced, that is, the thickness of the constituent wall forming the seismic isolation material 2. It is possible to thin the
When a horizontal force (vibration force) is applied to the seismic isolation device having such a configuration under a constant vertical load, as shown in FIG. 11, the seismic isolation material 2 first receives a vertical load. W2
(If the component wall forming the seismic isolation material 2 is not thin,
Since W1) shown in 0 is very small, seismic isolation material 2
The load per unit area acting on is large.
Then, as shown in FIG. 12, a part of the low-elasticity member 3 is pushed outward through the portion between the reinforcing plate 20 and the elastic rubber layer 21 to form a bump-shaped low-elasticity member pool A. A certain degree of vertical rigidity cannot be ensured due to the looseness and buckling phenomenon.

[0005]

Therefore, according to the present invention, a constant vertical rigidity can be ensured by forming a hump-shaped low-elasticity member pool on the outer peripheral portion of the vibration-isolating material or by making the buckling phenomenon less likely to occur. On the other hand, it is an object of the present invention to provide a seismic isolation device for lightweight construction that can further reduce horizontal rigidity, that is, a seismic isolation device for lightweight construction that is more suitable for structures that are lighter than conventional seismic isolation devices for lightweight construction. And

[0006]

According to a first aspect of the present invention, there is provided a seismic isolation device for a light building, which is a cylinder having a central through hole formed by alternately laminating and fixing annular reinforcing plates and annular elastic rubber layers. -Shaped seismic isolation material, a thin holding layer that is attached to the wall surface of the central through-hole and integrally deforms with horizontal deformation of the seismic isolation material, and in a cavity formed by the holding layer. And a filled low-elasticity member.

The seismic isolation device for a lightweight building according to claim 2 is
Cylindrical seismic isolation material having a central through hole, which is formed by alternately laminating and fixing annular reinforcing plates and annular elastic rubber layers, and a horizontal surface of the seismic isolation material that is attached to the wall surface of the central through hole. A holding layer having a lower elastic modulus than the elastic rubber layer that deforms integrally with the deformation in the direction and a low-elasticity member filled in a cavity formed by the holding layer are provided.

The seismic isolation device for a lightweight building according to claim 3 is
A cylindrical seismic isolation member having a central through hole formed by alternately laminating and fixing annular reinforcing plates and annular elastic rubber layers, and an outer peripheral surface attached to the wall surface of the central through hole and the seismic isolation. A thin holding bag that deforms integrally with the horizontal deformation of the material and a low-elasticity member filled in the holding bag are provided.

The seismic isolation device for a lightweight structure according to claim 4 is
A cylindrical seismic isolation member having a central through hole formed by alternately laminating and fixing annular reinforcing plates and annular elastic rubber layers, and an outer peripheral surface attached to the wall surface of the central through hole and the seismic isolation. A holding bag having an elastic modulus lower than that of the elastic rubber layer, which is integrally deformed when the material is deformed in the horizontal direction, and a low-elasticity member filled in the holding bag are provided.

[0010]

The function of the invention of this application is as follows. (Operation of the invention according to claim 1 or 2) In the seismic isolation device for a lightweight building according to the invention of claim 1, a holding layer is provided between the wall of the central through hole of the seismic isolation material and the low elastic member. Since a part of the low elasticity member does not enter between the reinforcing plate and the elastic rubber layer, the pressure applied to the wall surface of the central through hole of the vibration isolator generated by the vertical load is not Will work more uniformly than the ones listed in
As a result, a bump-shaped low-elasticity member pool is formed on the outer peripheral surface of the vibration isolator, and a buckling phenomenon is less likely to occur.

Further, since the above-mentioned holding layer is thin (it has a lower elastic modulus than the elastic rubber layer in claim 3), it does not hinder the reduction of horizontal rigidity. (Operation of the invention according to claims 3 and 4) In the seismic isolation device for a lightweight structure according to the invention of claim 3, an outer peripheral surface is attached to a wall surface of the central through hole, and the seismic isolation material is deformed in a horizontal direction. Since the holding bag that is integrally deformed with the vibration is provided, a part of the low-elasticity member does not enter between the reinforcing plate and the elastic rubber layer, and the vibration-isolating material is generated by the vertical load. The pressure on the wall surface of the central through-hole of will work more uniformly than that described in the section of the prior art,
As a result, a bump-shaped low-elasticity member pool is formed on the outer peripheral surface of the vibration isolator, and a buckling phenomenon is less likely to occur.

Further, since the above-mentioned holding bag has a thin thickness (the elastic modulus is lower than that of the elastic rubber layer in claim 4), it does not hinder the reduction of horizontal rigidity.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the invention of this application will be described below with reference to the drawings shown as embodiments. As shown in FIG. 1, the building seismic isolation device of this embodiment includes a pair of fixing plate members 1 arranged vertically, a cylindrical seismic isolation member 2 having a central through hole 22, and A holding layer 3 attached to the wall surface of the central through hole 22 and integrally deformed with the horizontal deformation of the seismic isolation member 2, and a low elastic member filled in the cavity formed by the holding layer 3. 4 and.

The fixing plate member 1 is formed of a circular annular plate, and four mounting holes (mounting holes are not shown) are formed at equal intervals in the circumferential direction. , And can be fixed to the ground side and the building side through these mounting holes. As shown in FIG. 1, the seismic isolation material 2 is formed by alternately laminating and fixing a reinforcing material 20 and a thin plate-like elastic rubber layer 21, and its outer periphery is made of the same rubber material as the elastic rubber layer 21. It is surrounded by.

The reinforcing member 20 is made of a circular annular steel plate, and the elastic rubber layer 21 is made to match the outer diameter and the inner diameter of the reinforcing member 20, as shown in FIG. The holding layer 3 is made of the same material as the elastic rubber layer 21 and is made of a rubber material having an elastic modulus of 1/10, and as shown in FIG. The part is bent inward.

The low-elasticity member 4 is made of butadiene-based low-elasticity rubber (elastic modulus 1/100), and is filled in the central through hole 22 of the seismic isolation material 2, as shown in FIG.
Here, the dimensions and the like shown in Table 1 for the building seismic isolation device (test body 5) and the building seismic isolation devices (test bodies 1 to 4) having the configuration described in the column of the conventional technique or the same type of construction. Fig. 3 shows the results of the compression fracture test conducted by setting these to
And the results of the compressive shear test are shown in FIGS.

[0017]

[Table 1]

From Table 1 and FIG. 3 to FIG.
It turns out that it shows in. With respect to the test bodies 1 to 3, the larger the through hole 22 (hole having the inner diameter d3 in Table 1), the smaller the compressive stress / deformation amount. When the dimensions of the through holes 22 are the same, the value of the compressive stress / deformation amount of the test body 5 is about four times that of the test body 3,
Further, the values of shearing force / deformation amount under the same compressive stress hardly change.

That is, comparing the test body 3 and the test body 5, in the embodiment of the present invention, a lightweight building seismic isolation device capable of ensuring a certain vertical rigidity and further lowering the horizontal rigidity. That is, it can be seen that it is possible to provide a seismic isolation device for lightweight construction that is more suitable for a structure that is lighter than the seismic isolation device for lightweight construction shown in the section of the related art. Note that, in the seismic isolation device for buildings, it has been found by the above test that a bump-like low elastic member pool A is formed on the outer peripheral surface of the vibration isolator 2 and a buckling phenomenon hardly occurs. ..

On the other hand, in the seismic isolation device for buildings of the embodiment shown in FIG. 2, instead of the holding layer 3 of the above embodiment, the central through hole 22 is used.
An outer peripheral surface is attached to the constituent wall surface, and a holding bag 9 that is integrally deformed as the seismic isolation member 2 is deformed in the horizontal direction is adopted. The holding bag 9 has an elastic modulus higher than that of the elastic rubber layer. Is made of low rubber material. In this case, the peripheral surface portion of the holding bag 9 exerts the function of the holding layer 3 described above, and has substantially the same effect as that of the above embodiment.

The holding layer 3 constructed as in the above embodiment.
If the holding bag 9 and the holding bag 9 have a relatively large elastic modulus and a small thickness, the same effect as that of the above-described embodiment can be obtained.
Further, as the material for forming the holding layer 3, other than rubber,
A single plastic, fiber reinforced rubber, plastic or the like can be used, and silicone rubber or the like can be used as a material for the low elastic member 4.

[0022]

The invention of this application has the following effects because it has the structure as described above. From the contents described in the action column, a lightweight construction seismic isolation device that can secure a certain vertical rigidity and further reduce the horizontal rigidity,
That is, the seismic isolation device for lightweight construction suitable for a structure that is lighter than the conventional seismic isolation device for lightweight construction can be provided.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a building seismic isolation device according to another embodiment of the present invention.

FIG. 3 is a compressive stress-deformation amount diagram in each of test bodies 1 to 5.

FIG. 4 is a shear force-deformation amount diagram of the test body 1.

5 is a shear force-deformation amount diagram of the test body 2. FIG.

FIG. 6 is a shear force-deformation amount diagram of the test body 3.

FIG. 7 is a shear force-deformation amount diagram of the test body 4.

FIG. 8 is a shear force-deformation amount diagram of the test body 5.

FIG. 9 is a cross-sectional view of the seismic isolation device for a building described in the section of Related Art.

FIG. 10 is a diagram when a horizontal force is applied to the seismic isolation device having a normal size through hole.

FIG. 11 is a diagram when a horizontal force is applied to the seismic isolation device having a through hole larger than usual.

FIG. 12 is a view showing a hump-shaped low-elasticity member reservoir formed in the building seismic isolation device described in the section of Related Art.

[Explanation of symbols]

 2 seismic isolation material 3 holding layer 4 low-elasticity member 9 holding bag 20 reinforcing plate 21 elastic rubber layer

Claims (4)

[Claims] 1. A cylindrical seismic isolation member having a central through hole, wherein an annular reinforcing plate and an annular elastic rubber layer are alternately laminated and fixed, and said cylindrical seismic isolation member is attached to said central through hole constituting wall surface, and said Light-weight construction characterized in that it comprises a thin-thickness holding layer that integrally deforms with horizontal deformation of the seismic isolation material, and a low-elasticity member filled in the cavity formed by the holding layer. Seismic isolation device for goods. 2. A cylindrical seismic isolation member having a central through hole, wherein an annular reinforcing plate and an annular elastic rubber layer are alternately laminated and fixed, and the cylindrical seismic isolation member is attached to the central through hole constituting wall surface and A holding layer having a lower elastic modulus than the elastic rubber layer that is integrally deformed with horizontal deformation of the seismic isolation member, and a low-elasticity member filled in a cavity formed by the holding layer. A seismic isolation device for lightweight structures characterized by the fact that 3. A cylindrical seismic isolation member having a central through hole, in which annular reinforcing plates and annular elastic rubber layers are alternately laminated and fixed, and an outer peripheral surface is attached to a wall surface of the central through hole. And a low-elasticity member filled in the holding bag, and a low-elasticity member that is integrally deformed as the seismic isolation material is deformed in the horizontal direction. Seismic isolation device. 4. A cylindrical seismic isolation member having a central through hole formed by alternately stacking and fixing annular reinforcing plates and annular elastic rubber layers, and an outer peripheral surface attached to a wall surface forming the central through hole. And a low-elasticity member filled in the holding bag and a holding bag having a lower elastic modulus than the elastic rubber layer that is integrally deformed with the horizontal deformation of the seismic isolation material. A seismic isolation device for lightweight buildings, which is characterized by that.