JPS6114340A - Earthquake-proof support apparatus - 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] [Technical Field] The present invention relates to support structures for structures such as buildings and heavy structures, and in particular, the present invention relates to support structures for structures such as buildings and heavy structures, and in particular, the present invention relates to support structures for structures such as buildings and heavy structures. It relates to a seismic isolation support device that protects objects.

[Prior art]

As methods for improving the seismic resistance of structures, in addition to methods for improving the seismic strength of the structures themselves, seismic isolation support methods for reducing the vibration energy transmitted to the structures have been adopted.

The latter seismic isolation support method dynamically views the structure as a vibrating system and extends its vibration period to prevent the structure from resonating with external inputs such as earthquakes and reduce response acceleration. , techniques are used to reduce energy transfer to the structure.

As shown in Fig. 1, the conventional structure of a device implementing such a seismic isolation support method is to arrange elastic supports 3 at predetermined intervals between a foundation 1 and a structure 2, and A structure is adopted in which the ends are fixed to opposing surfaces of the foundation 1 and the structure 2. The elastic support 3 is usually formed by alternately laminating elastic plates 4 made of rubber or the like and reinforcing metal plates.

By the way, the structure 2 is made to be strong in the vertical direction (vertical direction) to withstand the energy transmitted, unless it is a direct earthquake, but the strength in the lateral direction (horizontal direction) becomes a problem when an earthquake occurs. Become.

Therefore, according to the seismic isolation support device, when the foundation 1 moves horizontally when an earthquake occurs, the lower part of the elastic support 3 moves to follow this, but the upper part of the elastic support body 2
does not respond immediately due to the horizontal inertia of the elastic support 3.
Zero elastic deformation reduces the response acceleration of the structure, thereby reducing the transmitted energy.

However, in conventional support devices, each elastic support 3 is formed of a single laminate with a height H equal to the distance between the foundation 1 and the structure 2, so that the vertical When the horizontal displacement X increases while supporting a load, the pressure-receiving area, that is, the heavy area A when looking through the top and bottom surfaces of the elastic body 3 in the vertical direction, rapidly decreases, making it impossible to withstand the vertical load and causing the As shown in Figure 3, it had the disadvantage of being prone to buckling. That is, there was a drawback that the buckling limit horizontal displacement XO was small.

〔the purpose〕

The purpose of the present invention is to eliminate such drawbacks of the conventional structure,
By increasing the buckling limit horizontal displacement, the buckling strength can be improved, and the lateral spring constant can also be made smaller compared to conventional structures, and by increasing the natural period of the entire system, seismic isolation can be achieved. An object of the present invention is to provide a seismic isolation support device that can improve the effect.

〔composition〕

If the present invention can restrain the rotation of the central part of the elastic support without restraining the horizontal relative displacement of the foundation and structure,
It was developed with the focus on the ability to increase the pressure-receiving area for the same horizontal displacement, thereby increasing the buckling limit horizontal displacement.

That is, in the present invention, elastic supports are provided at at least three points forming the vertices of a triangle, and each elastic support body 'i''-g''''
iK*ih*”11”484162.

The above object is achieved by fixing the overlapping portions of the flexible bodies to a substantially rigid connecting member.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 4 to 6.

4 and 5 show an exemplary structure, in which three elastic supports 10 are provided between the foundation 1 and the structure 2. FIG. These elastic supports are arranged at the vertices of the triangle.

Each elastic support 10 is divided at the center in the transverse direction and has a stacked structure consisting of an upper support 10A and a lower support 10B. It is fixed to the connecting member 6. That is,
Support plates 7A and 8A are integrally provided on the upper and lower surfaces of each support upper IOA, and are fixed to the bottom surface of the structure 2 and the upper surface of the connecting member 6 via these support plates, and each support lower part 10
A support plate 7B is provided on the upper and lower surfaces of B.

8B are integrally provided and fixed to the lower surface of the connecting member 6 and the foundation 1 via these support plates.

Each of the upper support member 10A and the lower support member 10B has a structure in which a plurality of elastic plates 4 such as rubber and a plurality of reinforcing gold maple plates 5 are alternately laminated, as in the case of FIG. 1.

According to the structure of the embodiment shown in FIGS. 4 and 5 explained above, when an earthquake or the like occurs, if the displacement is within the buckling limit horizontal displacement, the connecting member 6 remains in the horizontal position as shown in FIG. 6. Displace horizontally.

Therefore, the behavior of the conventional structure shown in FIG. 1 and the example structure shown in FIGS. 4 and 5 will be compared.

First, it is assumed that the user is standing on the elastic support 3 of the conventional structure, the effective height is H1, the vertical spring constant is Kv, the horizontal spring constant is KH, and the pressure receiving area at the buckling limit horizontal displacement XC is A. Further, the effective height of the elastic support 10 in the example structure is also the same as the conventional structure.
shall be.

Based on these assumptions, regarding the support upper part 10A,
The height is H/2 and the vertical spring constant is 2Kv.

The lateral spring constant is 2KH, the pressure receiving area at the start of buckling is Ad, which is the same as the elastic support 3, and the buckling limit horizontal displacement at that time is also the same <Xo. As for the support lower part 10B, as in the case of the support upper part 10A, the height is H/2, the vertical spring constant is 2Kv1, the horizontal spring constant is 2KH, the buckling limit pressure receiving area is Ao, and the buckling limit horizontal displacement is Xo. Become.

Therefore, when looking at the elastic support 10 of the example structure, the vertical spring constant and the horizontal spring constant are the same as those of the vertical elastic support 3.
Kv (2Kv÷2) and KH (2KH÷
2) However, the horizontal displacement until the pressure-receiving area reaches the buckling limit value A is 2Xo (Xo . In other words, the buckling strength of the elastic support can be approximately doubled compared to the conventional structure.

As is clear from the description of the above embodiments, the gist of the present invention is to use the connecting member 6 to prevent the phenomenon in which the horizontal cross section of the intermediate portion of each elastic support body tends to rotate due to horizontal displacement, that is, the behavior at the start of buckling. The point is that they bind each other. On the other hand, horizontal pressing force due to earthquakes etc. generally acts in any direction. Therefore, in carrying out the present invention, it is necessary to arrange the elastic supports 10 at at least three locations forming each vertex of the triangle and to connect these to each other with the connecting members 6.

FIG. 7 shows an example in which elastic supports 10 similar to those in the above example are arranged at positions forming m points of a rectangle (a square in the illustrated example), and these are connected by a single connecting member 6. show,
Similar effects can be obtained by this embodiment as well.

When a large number of elastic supports 10 are arranged between the foundation 1 and the structure 2, it is possible to fix all the elastic supports with one connecting member 6, but it is possible to fix all the elastic supports with one connecting member 6. It is also possible to fix each number with separate connecting members 6.

In addition, in the illustrated example, each elastic support 10 is divided at the center to form two upper and lower stages, but if necessary, it can be divided into three or more stages.
It can also be fixed with more than one connecting member 6 to form a multi-stage structure. With the three-stage structure, even if the vertical and horizontal spring constants Kv are the same, the buckling limit horizontal displacement can be approximately three times that of the conventional structure, and the buckling strength can be further improved. Also,
In the case of a 12-tier structure, the connection and fixing position is not limited to the center, but may be shifted upward or downward.

Furthermore, according to the configuration of the present invention described above, elastic supports having the same dimensions and characteristics as the conventional structure are stacked in two stages, and by connecting and fixing them, the buckling strength is maintained equally, both vertically and horizontally. It is also possible to halve the spring constants of each, thereby increasing the natural period of the entire system and doubling the allowable deformation capacity.

〔effect〕

As is clear from the above description, according to the present invention, the buckling strength can be improved by increasing the buckling limit horizontal displacement of the elastic support, thereby improving the seismic resistance of the seismic isolation support device. can be done.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional seismic isolation support device, Fig. 2 is an explanatory diagram showing a state in which the device shown in Fig. 1 undergoes horizontal displacement and the pressure receiving area of the elastic support body decreases, and Fig. 3 FIG. 4 is a side view showing a seismic isolation support device according to an embodiment of the present invention, and FIG. 5 is a line V-■ in FIG. 4. 6 is an explanatory diagram showing the state when horizontal displacement occurs in the seismic isolation support device of FIG. 4,
FIG. 7 shows a fifth example of a seismic isolation support device according to another embodiment of the present invention.
3 is a cross-sectional view corresponding to the figure. 1...Foundation, 2...Structure, 6...
...Connecting material. 10...Elastic support body, 10A... Support upper part. 10B... Lower part of the support. Agent Patent Attorney Yasushi OotoFigure 4Figure 5

Claims (1)

[Claims] (1) In a seismic isolation support device that supports a structure by interposing elastic supports between a foundation and a structure, the elastic supports are provided at at least three points forming the vertices of a triangle, and each elastic support A seismic isolation support device characterized by having a structure in which bodies are stacked in at least two or more stages in the height direction, and the overlapping portion of each elastic support is fixed by a connecting member that is a substantially rigid body.