JPH09235907A - Earthquake-proof structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a uniform energy-damping effect against horizontal relative vibration produced in an optional direction between two buildings. SOLUTION: Horizontal girders 4, 5 at each of stories of two buildings A and B arranged side by side are connected each other with an earthquake-proof combination plate 20 serving as an energyabsorbing mechanism working horizontally. The combination plate 20 is constructed of a band platelike hollow steel plate 21 fixed to the building A at one side, a steel band plate 22 fixed to the building B at the other side and inserted into the hollow steel plate 21 so that it can move in an optional horizontal direction, and viscoelastic bodies each placed respectively between the upper flat plate part of the hollow steel plate 21 and one side of the steel band plate 22 and between the lower flat plate part of the hollow steel plate and the opposite side of the steel band plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic structure for a building, which has an improved seismic performance in a horizontal direction against an earthquake input.

[0002]

2. Description of the Related Art Conventionally, oil dampers and steel dampers (dampers that absorb energy by plastic deformation of steel) have been used as means for absorbing seismic energy for buildings. These dampers dissipate vibration energy by converting the vibration energy into heat energy or strain energy when vibration in a certain direction occurs.

[0003]

By the way, these dampers are mainly effective only for vibration in one direction. For example, two dampers having different vibration characteristics are arranged side by side. In order to absorb the vibration energy in the horizontal direction, the dampers must be installed separately in at least two orthogonal directions, which complicates the configuration. In addition, depending on the relationship between the installation direction of the damper and the actual vibration direction of the building, the damping effect of energy during an earthquake may differ for each damper, and it is not possible to obtain a uniform damping effect in any direction. It was difficult.

In view of the above circumstances, the present invention provides a seismic resistant structure for a building having a simple structure capable of exerting a uniform energy damping effect against vibrations in arbitrary directions occurring in two buildings having different vibration characteristics. The purpose is to

[0005]

According to a first aspect of the present invention, there is provided a seismic resistant structure for a building in which layers of two buildings arranged in parallel are connected to each other through an energy absorbing mechanism in a horizontal direction. The first absorption mechanism is fixed to one building side
Horizontal plate, a second horizontal plate fixed to the other building side and laminated on the first horizontal plate, and viscoelasticity sandwiched between the facing surfaces of the first horizontal plate and the second horizontal plate. It is characterized by consisting of a body.

According to a second aspect of the present invention, in the first aspect, the energy absorbing mechanism is arranged between horizontal beams that form boundaries between layers.

According to a third aspect of the present invention, in the first or second aspect, the base end of a strip-plate-shaped hollow steel plate having an opening at the tip is horizontally fixed in a cantilever state on the side of the one building. The upper and lower flat plate portions sandwiching the hollow portion of the hollow steel plate are the first horizontal plates, and the strip steel plate as the second horizontal plate can move in any horizontal direction from the tip opening into the hollow portion of the hollow steel plate. The viscoelastic body is inserted between the facing surfaces of the strip steel plate as the second horizontal plate and the upper and lower flat plate portions as the first horizontal plate. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an appearance of a building to which an embodiment of the present invention is applied. This building has a connecting floor 1 between the layers of two buildings A and B arranged side by side (the shaded area in the figure)
With the energy absorption mechanism (earthquake-resistant assembly board 20 described later) that is connected to the building and is incorporated in the connection floor 1, by absorbing the vibration energy that causes the relative horizontal displacement of both buildings A and B, the overall seismic performance is improved. It is the one.

FIG. 2 shows a cross section of the connecting floor 1. The connecting floor 1 connects parallel horizontal beams 4 and 5 that form the boundary of each layer of each building A and B, and a connecting beam 7 that is passed between the horizontal beams 4 and 5.
have. One end of the connecting beam 7 is fixed to the horizontal beam 4 on the side of the building A via the anchor plate 8, but the other end of the connecting beam 7 slides on the receiving portion 6 protruding from the horizontal beam 5 on the side of the building B. A bearing plate (for example, a stainless steel plate with Teflon stretched) 11 is slidably mounted in any horizontal direction. On the upper surface of the connecting beam 7, the floorboard 1 is connected via a joist 9.
No. 0 is laid, and a gap between the sliding support plate 11 and the horizontal beam 5 is covered with a metal deposit 12 for expansion joint treatment.

Below the connecting beam 7, a seismic resistant board 20 as an energy absorbing mechanism is horizontally arranged.
As shown in FIG. 3 and FIG. 4, the seismic resistant plate 20 includes a hollow steel plate 21 whose base end is fixed to the horizontal beam 4 on the building A side and a strip whose base end is fixed to the horizontal beam 5 on the building B side. It is composed of a steel plate 22 and a viscoelastic body 25 having both viscosity and elasticity. Hollow steel plate 21
Is a strip-shaped member having an opening at its tip, and is horizontally arranged in a cantilevered manner on the building A side. Strip steel plate 22
Is also supported on the building B side in a cantilever manner.
1 is inserted from the front end opening. And the hollow steel plate 2
Upper and lower flat plate portions (first horizontal plate) 21 sandwiching the hollow portion 1
a and 21b and the strip steel plate 22 (second horizontal plate) are arranged in a vertically stacked relationship, and the viscoelastic bodies 25 and 25 are sandwiched between the facing surfaces thereof.

However, the hollow steel plate 21 and the strip steel plate 22 are combined so as to be relatively displaceable in an arbitrary horizontal direction. That is, the hollow steel plate 21 and the strip steel plate 22 are relatively movable in the X direction in the drawing, and are also relatively movable in the Y direction (direction orthogonal to the X direction) due to the dimensional margin in the width direction. .

As shown in FIG. 2, the base end of the hollow steel plate 21 is fixed to the horizontal beam 4 on the building A side via an H-shaped steel 23 which serves as a base when the hollow steel plate 21 is attached.
Further, the base end of the strip steel plate 22 is fixed to the end surface of the receiving portion 6 by H
It is fixed to the horizontal beam 5 on the building B side through the shaped steel 24. In addition, the upper and lower surfaces of the hollow steel plate 21 have reinforcing steel members 15, 1
6 is attached, the reinforcing steel material 15 on the upper surface is suspended and supported by the joists 9 of the floor board 10 on the connecting beam 7 via the suspending material 14, and the reinforcing steel material 16 on the lower surface is the connecting beam 16. It is suspended and supported with respect to 7 via the suspending member 14.

Next, the operation will be described. At the time of an earthquake, both buildings A and B vibrate in the horizontal direction, but when a relative displacement occurs between both buildings A and B, the relative displacement also occurs between the hollow steel plate 21 and the strip steel plate 22 of the seismic resistant laminated plate 20. Occurs. Therefore, the two layers of viscoelastic bodies 25, 25 sandwiched between the upper and lower flat plate portions 21 a, 21 b of the hollow steel plate 21 and the strip steel plate 22 are deformed, and the deformation absorbs the displacement energy in the horizontal direction. Therefore, it is possible to absorb the vibrations of both buildings A and B as a whole by simply connecting both buildings A and B with the seismic resistant laminated plate 20 having a simple structure, and to improve the seismic performance.

In particular, the hollow steel plate 21 and the strip steel plate 22 can be displaced relative to each other in any horizontal direction, and the viscoelastic body 25 exerts a uniform energy absorbing effect against deformation in any direction. Further, the viscoelastic body 25 is in contact with the hollow steel plate 21 and the strip steel plate 22 over a wide area, and exhibits a large energy absorption effect. Therefore, it is possible to exert a uniform and large energy absorption effect on vibrations that cause arbitrary horizontal displacements of the buildings A and B. In this case, building A,
It is expected that each layer of B will vibrate differently, but since the seismic resistant laminated plate 20 is installed between the horizontal beams 4 and 5 that form the boundary of each layer, the vibration energy for each layer is It can be absorbed, and the vibrations of the entire buildings A and B can be effectively damped.

Further, the seismic-resistant laminated plate 20 has the appearance of a single steel plate, but has three horizontal plates (the upper and lower flat plate portions 21a and 21b of the hollow steel plate 21 and the strip steel plate 22) and two layers of viscoelasticity. Since the body 25 is provided, it is easy to handle and install, and a small installation space is required, but a large energy absorption effect can be exhibited. Further, since the strip steel plate 22 is inserted inside the hollow steel plate 21 having a predetermined cross-sectional shape and the viscoelastic body 25 is sandwiched between the facing surfaces of the respective plates, the viscoelastic body 2
5 can be kept in contact with the viscoelastic body 25 in a constant state without separately providing a mechanism for maintaining a constant contact state with respect to 5, and a simple structure and a constant performance can be obtained. Can be secured. Further, since the viscoelastic body 25 inside is not exposed to the outside, it is possible to protect the viscoelastic body 25 and prevent deterioration of performance.

In the above embodiment, two buildings A,
Although the case where B is connected is illustrated, the present invention can be applied to the case where one building is divided into two and both are connected. The present invention can be applied not only to a newly built building but also to improving the earthquake resistance of an existing building. Further, it goes without saying that the present invention can be applied to the case where two or more buildings are connected.

[0017]

As described above, according to the invention of claim 1, the layers of two buildings arranged in parallel are connected by a horizontal energy absorption mechanism, and the energy absorption mechanism is
Since it is composed of a first horizontal plate fixed to one building side, a second horizontal plate fixed to the other building side, and a viscoelastic body sandwiched between the facing surfaces of both horizontal plates, both can be used during an earthquake. Building vibrates in the horizontal direction and when the relative horizontal displacement occurs between the first horizontal plate and the second horizontal plate due to the difference in the vibration characteristics, the vibration energy is generated by the viscoelastic body sandwiched between them. Can be absorbed and the entire vibration can be damped. Particularly in this case, since the first horizontal plate and the second horizontal plate can be displaced relative to each other in any horizontal direction, the viscoelastic body exerts a uniform energy absorption effect regardless of displacement in any direction. . Also,
Since the viscoelastic body is in contact with both horizontal plates over a wide area, a large energy absorption effect is exhibited. Therefore, with a simple structure of a combination of a horizontal plate and a viscoelastic body, it is possible to exert a uniform and large energy absorption effect against vibration in any horizontal direction, and it is possible to improve the earthquake resistance of the building.

According to the second aspect of the present invention, by disposing the energy absorbing mechanism between the horizontal beams that form the boundaries between the layers of the building, it is possible to effectively enhance the earthquake resistance of both buildings.

According to the invention of claim 3, an energy absorbing mechanism for connecting two buildings is provided with a strip-shaped hollow steel plate.
It is composed of a strip steel plate inserted inside from the tip opening and a viscoelastic body, and the upper and lower flat plate portions of the hollow steel plate are the first horizontal plates, and the strip steel plate inserted therein is the second horizontal plate. In this case, the number of horizontal plates laminated increases and the number of viscoelastic bodies sandwiched between the horizontal plates also increases, so that the energy absorption effect can be enhanced. Further, in the invention of claim 3, the strip steel plate as the second horizontal plate is inserted into the hollow steel plate having a predetermined cross-sectional shape, and the first horizontal plate (upper and lower flat plate portions of the hollow steel plate) and the second horizontal plate are formed. Since the viscoelastic body is sandwiched between the surfaces facing the horizontal plate, the horizontal plate can be fixed to the viscoelastic body without a special mechanism for maintaining a constant contact state with the viscoelastic body. It is possible to keep them in contact with each other in a state of, and it is possible to secure a certain energy absorption performance while having a simple structure. In addition, since the viscoelastic body inside is not exposed to the outside, the viscoelastic body can be protected, and since it has the appearance of a single steel plate, it is easy to handle and install.

[Brief description of drawings]

FIG. 1 is an external perspective view schematically showing a building to which an embodiment of the present invention is applied.

FIG. 2 is a detailed sectional view of a portion taken along the line II-II in FIG.

3 is a schematic plan view of an installed state of a seismic resistant laminated plate 20 as the energy absorbing mechanism shown in FIG.

FIG. 4 is a partially cutaway perspective view showing an internal structure of the seismic resistant laminated plate 20.

[Explanation of symbols]

 A, B Building 4,5 Horizontal beam 20 Seismic resistant plate (energy absorption mechanism) 21 Hollow steel plate 21a, 21b Flat plate part (first horizontal plate) 22 Strip steel plate (second horizontal plate) 25 Viscoelastic body

Claims (3)

[Claims] 1. A seismic-resistant structure for a building, in which layers of two buildings arranged in parallel are connected to each other through a horizontal energy absorption mechanism, wherein the energy absorption mechanism is fixed to one building side. A first horizontal plate, a second horizontal plate fixed to the other building side and laminated on the first horizontal plate, a first horizontal plate and a second horizontal plate.
Seismic-resistant structure of a building, characterized in that it is composed of a viscoelastic body sandwiched between the opposing faces of the horizontal plate of. 2. The seismic resistant structure for a building according to claim 1, wherein the energy absorbing mechanism is arranged between horizontal beams that form boundaries between layers. 3. A base end of a strip-shaped hollow steel plate having an opening at the tip is horizontally fixed in a cantilever state on the one building side, and upper and lower flat plate parts sandwiching the hollow part of the hollow steel plate are provided. The first horizontal plate, the strip steel plate as the second horizontal plate is inserted into the hollow portion of the hollow steel plate from the tip opening so as to be movable in any horizontal direction. The seismic resistant structure for a building according to claim 1 or 2, wherein the viscoelastic body is sandwiched between respective facing surfaces of a strip steel plate as a plate and upper and lower flat plate portions as the first horizontal plate. .