JPH116326A - Dynamically rigid structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to definitely and easily improve the earthquake- resistant performance of an intermediate-rise or high-rise building and also to give a high attenuation factor to the intermediate-rise or high-rise building by using relatively simple and low-cost devices. SOLUTION: In part of or all upper layer stories of an intermediate-rise or a high-rise building, highly attenuated laminated-rubber bearings 4 are installed distributively at intermediate positions in up-down direction of inner columns 2 or the side columns 3b of the inner columns 2 or outer columns, thereby creating a dynamically rigid structure for enhancing the dynamic horizontal rigidity of upper layer stories of the intermediate-rise or high-rise building. And by applying the upper layer stories as a dynamic absorber to the lower layer stories, horizontal responding amount of fluctuation in the upper and lower layer stories can be greatly reduced during earthquake, and then responding shearing force at the first story portion can be considerably decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic rigid structure for improving the seismic performance of a high-rise building.

[0002]

2. Description of the Related Art Conventionally, techniques for improving the seismic performance of a building include, for example, a seismic isolation structure using laminated rubber, a vibration control structure using a damping device, a wall type structure having high static rigidity, and so on.

[0003]

[Problems to be solved by the invention]

(1) The seismic isolation structure is a method of reducing seismic force by arranging laminated rubber on the foundation of the building, but it is difficult to apply to middle and high-rise buildings.

(2) Various methods of applying damping to a building have been devised, but it is expensive and it is difficult to provide a high damping rate.

(3) The wall-type structure is an advantageous earthquake-resistant structure for a low-rise building, but is difficult to apply to a middle-to-high-rise building.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to easily and surely improve the seismic performance of a middle and high-rise building, and to use a relatively simple and inexpensive device. Accordingly, it is an object of the present invention to provide a dynamic rigid structure capable of giving a high damping rate to a high-rise building.

[0007]

In order to improve the seismic performance of a building, it is important to increase the horizontal rigidity of the whole building. In a low-rise building, it is realistic to increase the horizontal rigidity and improve the seismic performance by sufficiently arranging the earthquake-resistant walls. In high-rise buildings, because of its proportions,
Since the horizontal rigidity is inevitably reduced, an increase in horizontal deformation during an earthquake is inevitable. Therefore, rational design is performed by adjusting the design load so that horizontal deformation occurs as uniformly as possible on each floor. However, it is inevitable that the beam-column frame is plastically deformed during a large earthquake. As described above, it is difficult to increase the horizontal rigidity at the time of an earthquake in a high-rise building, but in the present invention, the seismic performance is improved by increasing the dynamic horizontal rigidity of the high-rise building.

That is, in the present invention, the inner pillars and / or outer pillars (for example, only inner pillars or corner pillars in inner pillars and outer pillars are excluded) on some or all of the upper floors of a middle- and high-rise building. A laminated rubber bearing having a damping function is disposed at an intermediate portion in the vertical direction of the side column) to constitute a dynamic rigid structure. As a laminated rubber bearing having a damping function in the present invention, a high-damping laminated rubber bearing having a damping property in a rubber material itself can be used, or a laminated rubber bearing made of a natural rubber material can be used as a central part. It is also possible to use a laminated rubber bearing containing a lead plug in which lead is embedded.

[0009] In the above-described dynamic rigid structure, the upper floor portion is provided with the laminated rubber bearing, so that the static horizontal rigidity is lower than that of the lower layer portion. Due to the damping property of the rubber bearing, it has a higher dynamic horizontal stiffness as compared to the lower part. Therefore, the horizontal deformation amount of each floor in the upper layer is substantially the same as the horizontal deformation amount of the lower floor.

On the other hand, a phase shift occurs between the vibration of the upper floor portion and the vibration of the lower floor portion, and a part of the inertial force of the upper floor portion appears as a damping action to the lower floor portion. For this reason, the horizontal deformation of the lower floor portion where no damping material (high damping laminated rubber bearing) is provided during a large earthquake is reduced. Although this principle is similar to the operation of a dynamic vibration absorber, it is difficult to expect a response reduction effect of a building in the event of a large earthquake, because a dynamic vibration absorber usually has a small mass ratio and therefore causes large deformation.
In the present invention, even if the interlayer deformation of each layer in the upper floor portion is small, the amplitude of the entire upper floor becomes large, and therefore the same effect as that of the dynamic vibration absorber can be expected. Further, since the weight of all the upper floors of the building can be used, a large vibration reduction effect can be expected.

Further, since the pillars on the upper floor of the building have a higher strength than the lower floors, even if a laminated rubber bearing is inserted into some of the pillars on the upper floor, there is a sufficient strength on the whole. There is no problem, and a high-damping laminated rubber bearing can be arranged on the upper floor to constitute a dynamic rigid structure.

Further, the laminated rubber bearing of the present invention has a margin since the seismic isolation structure supports only the weight of the upper floor compared with that of the lowest floor, which supports the entire weight of the building. It is cheaper in comparison.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a schematic view of a building for explaining the principle of the dynamic rigid structure according to the present invention. FIG. 2 is a plan view and a frame diagram of a building that has been trial designed as a practical design. FIG. 3 is a plan view and a front view showing the arrangement of the high-damping laminated rubber bearing used in the present invention. FIG. 4 is a plan view and a front view showing an actually designed high damping laminated rubber bearing.

As shown in FIG. 2, for a 13-story building 1, a high-attenuated rubber material is used at an intermediate portion in the vertical direction of the inner pillar 2 in each of the upper floors A of the 10th to 13th floors. The damping laminated rubber bearing 4 is inserted and arranged to increase the dynamic horizontal rigidity of the upper floor A. The outer pillar 3 as a normal pillar secures static horizontal rigidity. Since the upper floor A has a higher strength than the lower floor B, even if the high-damping laminated rubber bearing 4 is inserted into some of the pillars of the upper floor A, the upper floor as a whole has a higher strength, There is no problem at all.

In the example of FIG. 2, the high-damping laminated rubber bearings 4 are provided on all the floors of the upper floor A. However, the present invention is not limited to this. For example, as shown in FIG. A high damping laminated rubber bearing 4 may be provided on some floors. Further, the high-damping laminated rubber bearing 4 is provided on the inner pillar 2, but is not limited to this. For example, the high-damping laminated rubber bearing 4 is also provided on the side pillar 3 b except for the corner pillar 3 a of the outer pillar 3. You may do so.

As shown in FIGS. 3 and 4, the high-damping laminated rubber bearing 4 is composed of upper and lower end plates 5, a high-damping rubber 6 and a steel plate 7 alternately laminated between the end plates 5, 5.
Although the structure is the same as that of a normal high damping laminated rubber bearing, in the present invention, since the interlayer deformation of each layer of the upper floor A is small, the allowable deformation may be about 3 to 5 cm. this is,
It is set in consideration of the value of the allowable interlayer deformation of each layer. Since the total thickness of the rubber layer can be reduced as compared with the seismic isolation bearing, a stable bearing having a high buckling load can be obtained. In addition, it is possible to cope with large deformation by increasing the thickness of the laminated steel plate 7 as compared with a normal laminated rubber. The above points are different from the conventional seismic isolation structure. Also, in contrast to the conventional seismic isolation structure that supports the entire weight of the building on the lowest floor, in the present invention, the upper floor A supports the upper floor, so that an inexpensive high-damping laminated rubber bearing can be used. it can.

In the above configuration, the upper floor A is
Due to the damping action of the high damping laminated rubber bearing 4, the dynamic horizontal rigidity is increased as compared with the lower floor B, the horizontal deformation of each floor of the upper floor A during an earthquake is reduced, and the lower layer having a high static horizontal rigidity. The horizontal deformation amount is almost the same as the floor B. Further, a phase shift occurs between the vibration of the upper floor A and the vibration of the lower floor B, and a part of the inertial force of the upper floor A acts as a damping effect on the lower floor B. Even if it is small, the amplitude of the entire upper floor is large and the weight of the entire upper floor can be used, so that a large vibration reduction effect is obtained and the horizontal deformation of the lower floor B during an earthquake is reduced.

FIG. 5 is a graph comparing the response reduction effect of a 13-story building during an earthquake with the conventional design method and the present invention. From this graph, the amount of response deformation on the top floor and the response shear force on the first floor are shown. Can be reduced to about 1/2.

[0019]

As described above, the present invention provides a laminated rubber bearing having an attenuating function at a vertically intermediate portion of an inner pillar and / or an outer pillar on part or all of the upper floors of a middle-rise building. Since the arrangement is arranged to enhance the dynamic horizontal rigidity of the upper floor portion, the following effects can be obtained.

(1) The dynamic horizontal stiffness of the upper floor of a middle-high-rise building is increased, and the upper floor acts as a dynamic vibration absorber on the lower floor, so that the response horizontal deformation of the upper floor and the lower floor during an earthquake Can be greatly reduced, and the seismic performance of middle- and high-rise buildings can be easily and reliably improved.

(2) The response shear force of middle- and high-rise buildings during a large earthquake can be reduced to about 1/2 to 1/3, making it applicable to any ground. Unsuitable).

(3) Simple and inexpensive devices as compared with conventional rubber bearings of seismic isolation structure and dampers used for seismic control structure,
High damping rate can be given to middle and high rise buildings.

(4) Since it is only necessary to provide the high-damping laminated rubber on the upper floor, there is an advantage that the applicable range of the building is wide.

[Brief description of the drawings]

FIG. 1 is an example of a building for explaining the principle of a dynamic rigid structure according to the present invention, in which (a) is a plan view and (b) is a front view of a frame.

FIGS. 2A and 2B are examples of a building in which a dynamic rigid structure according to the present invention is trially designed, wherein FIG. 2A is a plan view and FIG.

3A and 3B show the arrangement of a high-damping laminated rubber bearing used in the present invention. FIG. 3A is a plan view of the laminated rubber, FIG. 3B is a cross-sectional view of the laminated rubber, and FIG.

4 (a) is a plan view and FIG. 4 (b) is a front view showing a high damping laminated rubber bearing actually designed according to the present invention.

FIG. 5 is a graph comparing the effect of reducing the response at the time of earthquake between the conventional technology and the present invention.

[Explanation of symbols]

 A: Upper floor B: Lower floor 1 ... Building 2 ... Inner pillar 3 ... Outer pillar 3a ... Corner pillar 3b ... Side pillar 4 ... High damping laminated rubber bearing 5 ... End plate 6 ... High damping rubber 7 ……steel sheet

Claims (1)

[Claims] 1. A laminated rubber bearing having a damping function is disposed at an intermediate portion in the vertical direction of an inner pillar and / or an outer pillar on a part or all of the upper floors of a middle- and high-rise building. Dynamic rigid structure.