JPH0336375A - Damper device for seismic isolation buildings - 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 damper device for seismically isolated buildings.

<Conventional technology> Figure 6 shows a conventional damper device for seismically isolated buildings.

There is something like the one shown in Figure 7. This damper device for a seismically isolated building is equipped with an upper mounting base l that is attached to a building, a lower mounting base 2 that is attached to a foundation, and a ring-shaped elastic-plastic member 3, and both ends of the ring-shaped elastic-plastic member 3 are welded together. Above by 4,
It is fixed to the lower mounting base 1.2. Relative displacement of the building with respect to the foundation due to an earthquake is allowed by the elastic-plastic deformation of the elastic-plastic member 3, and shaking of the building is absorbed by the plastic deformation of the elastic-plastic member.

<Problem to be Solved by the Invention> However, in the above-mentioned conventional damper device for a seismically isolated building, the fixed ends of the elastoplastic member 3 where stress and strain are concentrated are attached to the welded portions 4 to the upper and lower mounting bases. Since the ends of the elastic-plastic member 3 are fixed by the welding process, the strength of the elastic-plastic member 3 decreases due to the heat effect caused by the welding, and the repeated deformation capacity decreases, resulting in a decrease in yield strength. For example, in the structure shown in Figure 6.7, a ring-shaped elastic-plastic member made of a steel rod with a diameter of 50 mm is
Figure 8 shows the displacement-load characteristics when a rope return displacement of 50 mg+ is applied. As can be seen from FIG. 8, the conventional damper device for a seismically isolated building breaks within 10 waves when the rope is returned to a position of ±250 degrees.

Therefore, an object of the present invention is to shift the tip of the elasto-plastic member whose strength decreases due to welding etc. from the fixed end of the elasto-plastic member where the stress and strain are maximum, thereby improving the strength of the fixed end of the elasto-plastic member. It is an object of the present invention to provide a damper device for a seismically isolated building that has greatly increased proof strength and has a large energy absorption capacity.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a damper device for a seismic isolation building in which each end of a ring-shaped elastic-plastic member is fixed to upper and lower mounting bases. The mounting base is characterized by being provided with a fixing part for fixing the tip of the elastic-plastic member, and a clip part for pinching the fixed end connected to the tip of the elastic-plastic member.

When the foundation is displaced relative to the building due to an earthquake, the relative displacement of the upper and lower mounts fixed to each is absorbed by the elasto-plastic deformation of the ring-shaped elasto-plastic member, and the earthquake energy is elasto-plastic. Absorbed by plastic deformation of the member. The distal end portion of the elastic-plastic member is fixed to the mounting base by a fixing portion, for example, by welding, and the fixed end portion extending from the tip end to the center side is fixed to the mounting base using a pinching portion. Therefore, for example, the tip end, which is affected by heat due to welding and whose strength decreases, and the fixed end sandwiched between the pinching parts are separated, and the fixed end, which is subject to the greatest stress and strain, is affected by the heat caused by welding. There is no reduction in strength or yield strength. Therefore, this damper device for a seismically isolated building has a large yield strength and a large energy absorption capacity.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In Figure 1.2, 11 is a substantially rectangular main mounting base that is fixed to the building, 12 is a substantially rectangular lower mounting base that is fixed to the foundation, and 13 is a substantially rectangular main mounting base that is fixed to the building.
1.3a, 13b, 1.3c, and 13d are elastic-plastic members made of square rods wound approximately spirally. Both end portions of the elastic-plastic members 13a, 131), 13c, and 13d are three-dimensionally orthogonal to each other. Mounting flanges 16 having bolt holes 15 are formed at the center of each side of the ball mount 2. Another ball mount! Two parallel ills 7.17 each having a substantially rectangular cross section are formed on the upper surface of the . This l?
17 is an elastic-plastic member 13m.

It has a slightly larger cross-sectional area than the cross-sectional areas of 13b, 13c, and 13d, so that elastic-plastic members can be inserted closely, and the elastic-plastic member 13a is located approximately in the center thereof.

This is a welding fixing portion for fixing the tip portions T of 13b, 19c, and 13d by welding. As shown in FIG. 1.4, a groove 18 is provided at the location that will be the welded and fixed portion. Elastoplastic member 13a to approximately the center of the groove 17.17,
The tips of 13b, 13c, and 13d are inserted, respectively, and the tips are abutted against each other. However,
The inside of the groove 18 is filled with weld metal 19 to form the elastic-plastic member 1.
The tips T of 3a, 13b, 13c, and 13d are integrally fixed to the main mounting base 11. Then, this elastic-plastic member 1
3m, 13b, l 3c, and 13d are fixed by being clamped from both sides by the side wall of the groove 17 of the main mounting base 11 and the substantially rectangular block-shaped pinching member 21. There is. This pinching member 21 and the side wall of the groove 17 constitute a pinching portion. The lower outer corner of the sandwich member 21 is chamfered as shown in FIG. 3, and the chamfered portion is filled with weld metal 22 to fix the sandwich member 21 to the main mounting base 11. Also, the sandwiching member 2
1 and the outer end of the side wall of the groove 17 of the main mounting base 11 form a tapered space 23 that widens toward the end, and the elastic-plastic member 13a
, 13b, 13c, and 13d are bent in the left-right direction, the outermost contact point between the fixed end F and the main mount 11 or the sandwich member 21 moves to the outside of the main mount 11, and the fixed end F The part that connects to is deformed smoothly. The lower mount 12 has exactly the same structure as the main mount 11, except that the groove 17.17 is the same as the groove 17.17 of the main mount 11.
The phase is shifted by 90 degrees.

In the above configuration, it is assumed that the ball mount 2 is fixed to the building with bolts and the lower mount 12 is fixed to the foundation. When the foundation shakes due to an earthquake, the displacement of the foundation relative to the building, that is, the displacement of the main mount 11 relative to the lower mount 12, is allowed by the elastic-plastic deformation of the elasto-plastic members 13a, 13b, 13e, and 13d, and the vibration energy of the building is Elastoplastic member 13
a, 13b, 13c.

It is absorbed by the plastic deformation of 13d.

At this time, elastic-plastic members 13a, 13b, 13c, 1
Fixed end F which is sandwiched and fixed by the sandwiching member 21 of 3d and the side wall of the groove 17 of the upper or lower mounting base 11.12
is subject to large strains and stresses. However, this fixed end F
Since it is away from the tip T, which is fixed by welding, there is little thermal influence due to welding, and the strength does not decrease. Therefore, this fixed end portion F can withstand large stress and strain. Further, since no large bending force is applied to the tip T fixed by the welding fixing part 19 on the back side of the fixed end F, the tip T will break even if its strength is reduced due to the heat effect due to welding. There is no such thing.

In this way, the elastic-plastic members 13a, 13b, 13c, 13d
By separating the fixed end F of and the tip T to be welded and fixed, the fixed end F has a large yield strength, and the elastic-plastic members 13a, 13b, 13c, 13
The energy absorption capacity of d is significantly increased.

Moreover, these elastic-plastic members 13a, 13b, 13c, l
Since the side walls of the groove 17 that sandwich the fixed end portion F of 3d and the outside of the side walls of the sandwiching member 21 widen toward the elastic-plastic members, the elastic-plastic members 13a, 13b, 13c, 1
The curvature due to the bending of the portion continuous to the fixed end F of 3d becomes gentle, so that the elastic-plastic members 13a, 13b
, 13c, and 13d do not break at the point where they are connected to the fixed end F.

As with the conventional example, repeated tests were conducted on the above example with a displacement of ±250 mm. As a result, as shown in FIG. 5, it was found that it could withstand approximately 60 repeated waves before breaking. In other words, in this example, the 6th and 7th
．． It was found that the yield strength was six times that of the conventional one shown in Figure 8. This damper device for seismically isolated buildings has significantly increased energy absorption capacity.

In the above embodiment, the pinch member 21 constituting a part of the sandwich portion is fixed to the upper mounting base 11 by a welding portion 22, but the pinch member 21 is not limited to welding, but may be fixed by bolting or the like. This pinching part may have any structure as long as it clamps and fixes the end of the elastic-plastic member. In the above embodiment, the tip portion was fixed by welding, but it may also be fixed by bolts.

<Effects of the Invention> As is clear from the above, the damper device for a seismically isolated building of the present invention secures the fixed ends of the elastoplastic member by sandwiching them between the pinching parts, fixes the tip part by the fixing parts, and improves the strength. Since the distal end portion, which is weakened, and the fixed end portion, which is subjected to large stress and strain, are separated, the fixed end portion does not lose its strength and has a large yield strength, and thus has a large energy absorption capacity.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of a damper device for seismic isolated buildings according to the present invention, FIG. 2 is a front view of the above embodiment, and FIG.
Figure 4 is a cross-sectional view taken along line III-m in Figure 1, and Figure 4 is IV-IV in Figure 1.
5 is a displacement-load characteristic diagram of the above embodiment, FIG. 6 is a plan view of the conventional example, FIG. 7 is a front view of the conventional example, and FIG.
The figure is a displacement-load characteristic diagram of a conventional example. 11... Upper mounting base, 12... Lower mounting base, 13a,
13b, 13c, 13d... elastoplastic member, 19.
...Welding part, 21...Pinch member, T...Tip part, F
...Fixed end. Patent applicant: Okumura Gumi Co., Ltd. Agent

Claims (1)

[Claims] (1) In a damper device for a seismically isolated building in which each end of a ring-shaped elastic-plastic member is fixed to the upper and lower mounting bases, a fixing part that fixes the tip of the elastic-plastic member to the mounting base. A damper device for a seismically isolated building, comprising: and a pinching portion that pinches a fixed end connected to the tip of the elastoplastic member.