JP2003106004A - Seismically isolated structure of cable reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the seismically isolated structure of cable reinforcement in which noxious pull-out force and a floating generated in the structure are inhibited. SOLUTION: The seismically isolated structure is composed of the combination of a bending-deflection reducing main frame consisting of a shaft having a structure mainly resisting horizontal force and a cable, which is installed in arrangement in which the horizontal deformation of the shaft is suppressed and to which pretension is introduced, and a slave frame constructed in a juxtaposing structure independent of the main frame. Base isolation layers are mounted on the upper and lower sections of the slave frame, and a section between the main and slave frames is connected by a damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable reinforced type for suppressing deformation of a high-rise building or a super-high-rise building, or a structure having a large tower ratio and a seismic isolation system to which a seismic isolation system is applied, by a cable. It belongs to the technical field of seismic isolation structures.

[0002]

2. Description of the Related Art FIG. 5A shows an example of a seismic isolation structure using a laminated rubber type seismic isolation bearing a which is generally used at present as an seismic isolation system for lengthening the seismic response of seismic isolation structures. . The laminated rubber bearing a has a very large allowable range for the compression axial force, but has a small allowable tensile axial force. Fig. 5B shows a seismic isolation system that enhances the seismic isolation effect over a longer period.
In the figure, a seismic isolation structure is shown in which a sliding bearing (rolling bearing) b is mainly used and a restoring mechanism including a slight laminated rubber bearing a is also used. These seismic isolation structures are now commonly practiced.

As shown in FIGS. 5A and 5B, the seismic isolation structure has a structure in which the upper part of the seismic isolation layer (seismic isolation device a, b) shows a rigid behavior in a low-rise building, or is bent and deformed into an upper structure. The seismic isolation effect is effective when the pull-out force does not occur even if the occurrence occurs.

However, when a building with a large tower-like ratio or a high-rise or super-high-rise building is used, as shown in FIGS. 6A and 6B, the pull-out force N due to bending deformation acts on the laminated rubber bearing a as an earthquake response. Alternatively, the occurrence of a problem such as "lifting" of the sliding bearing b is the structural limit of the seismic isolation structure.

Therefore, the development of a laminated rubber bearing that resists pulling against the pulling force N is "floating".
The seismic isolation system that allows this is being developed, and the seismic isolation structure is being made higher. However, in order to realize higher-rise or super-high-rise buildings or seismic isolation structures with a larger tower ratio, the current technology is still insufficient.

At present, representative examples of conventional techniques known in the technical field of seismic isolation structures will be described. For example, the inventions described below are known.

(1) Japanese Patent No. 2631486 (issued on July 16, 1997) discloses a laminated structure for preventing the pulling-out force (negative axial force = tensile axial force) generated in a seismic isolated structure from all overturning. A technique of receiving and bearing the load with a rubber body and applying a reaction force to the ground through the earth anchor (for example, 35 in the right column of page 2 of the same publication).
The description of lines 39 to 39) is disclosed.

(2) Japanese Unexamined Patent Publication No. 11-270174 discloses a center core type seismic isolation structure in which a PC is installed along the outer peripheral column between the top girder at the top of the core and the foundation.
A seismic isolation structure is disclosed in which steel materials are arranged vertically and pre-tension is introduced into the PC steel material to expect a damping effect during an earthquake.

(3) In Japanese Unexamined Patent Publication No. 11-229662, the other end of a cable, which is fixed to the upper part of the outer wall of a building supported by a seismic isolation device, is connected at the other end to a tensile force generating mechanism provided at the lower part of the building. Then, a pre-tension is applied to the cable, and a seismic isolation structure that prevents the building from rising during an earthquake is disclosed.

[0010]

[Problems to be Solved by the Invention]
All of the conventional seismic isolation structures described in (2) and (3) increase the horizontal rigidity of the laminated rubber body for fall prevention or the laminated rubber bearing body to which prestress is introduced, even in normal times. As a result, the horizontal rigidity of the seismic isolation layer is increased, which reduces the horizontal flexibility required for the seismic isolation layer.
As a result, there is a problem that the seismic response acting on the seismic isolation structure is increased and the seismic isolation effect is reduced.

An object of the present invention is to generate a high-rise or ultra-high-rise building or a seismic isolated structure having a large tower ratio by reinforcing the main frame of the seismic isolated structure with a cable to suppress deformation. A cable that suppresses harmful pull-out force (tensile axial force) and lifting, yet has little adverse effect on the horizontal rigidity of the base isolation layer, does not increase the seismic response that acts on the base isolation structure, and has a good seismic isolation effect. It is to provide a reinforced seismic isolation structure.

[0012]

As a means for solving the above-mentioned problems of the prior art, a cable-reinforced seismic isolation structure according to the invention of claim 1 is a high-rise building or a super-high-rise building,
Alternatively, in a cable-reinforced seismic isolation structure that suppresses deformation of a seismic isolation structure with a large tower ratio by a cable, a shaft with a structure that mainly resists horizontal force and a pretension installed in an arrangement that suppresses horizontal deformation of the shaft The main structure is a combination of a bending deformation reducing main frame composed of a cable and a subframe structure that is independent of the main frame, and seismic isolation layers are provided above and below the subframe.・ The feature is that the subframes are connected by dampers.

A cable-reinforced seismic isolation structure according to a second aspect of the present invention is a cable-reinforced seismic isolation structure for suppressing deformation of a high-rise building or a super-high-rise building or a seismic isolation structure having a large tower ratio with a cable. , A bending-deformation-reducing main frame composed mainly of a shaft having a structure for resisting horizontal force, and a cable installed in an arrangement for suppressing horizontal deformation of the shaft and introducing pretension, and a side-by-side structure independent of the main frame. It is constructed in combination with the constructed subframe. It is characterized in that seismic isolation layers are provided at the top and bottom and in the middle of the subframe, and the main and subframes are connected by dampers.

The invention according to claim 3 is the seismic isolation structure for cable reinforcement according to claim 1 or 2, characterized in that the subframe is composed of a single-layer or multi-layer structure.

According to a fourth aspect of the present invention, in the cable-reinforced seismic isolation structure according to any one of the first to third aspects, the multi-layered subframe includes a top girder and an intermediate girder prepared for the main frame. It is characterized by being constructed between layers.

According to a fifth aspect of the present invention, in the cable-reinforced seismic isolation structure according to the first or second aspect, the reaction force of the pretension introduced into the cable is an individual underground anchor or a structure. It is characterized in that it is processed by self-balancing as a whole.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the seismic isolation structure according to the invention described in claims 1 to 5 will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of a cable-reinforced seismic isolation structure according to the first aspect of the present invention, in which a subframe is composed of one layer. It should be understood that the cable referred to in the present invention is a concept including a rod material such as a PC steel rod.

The present embodiment is a cable-reinforced seismic isolation structure that suppresses deformation of a high-rise or ultra-high-rise building or a seismic isolation structure having a large tower ratio with a cable. The shaft 1 constructed by the structure described above is installed between the upper end of the shaft 1 and the ground so as to suppress the horizontal deformation of the shaft 1, and is installed in a C-shaped arrangement symmetrical in four directions orthogonal to each other in plan view, and pre-tensioned. The bending deformation-reducing main frame composed of the cables 3 and 3 and the sub-frame 4 constructed in a side-by-side structure independent of the main frame are combined.

As shown in FIG. 2B, the shaft 1 of the main frame and the subframe 4 are arranged in four positions at four positions on the outer periphery of the shaft 1 of the main frame as a center (core).
Are arranged symmetrically. Each subframe 4 is structured to have a living room or an office in a normal building.

The subframe 4 is provided with seismic isolation layers above and below, and is supported by seismic isolation bearings 5 such as laminated rubber bearings or sliding bearings in a horizontal rigid state to reduce seismic input. There is. The seismic isolation layer at the upper end of the subframe 4 is provided between the top girder 2 provided at the upper end of the shaft 1. The seismic isolation layer at the bottom is provided between the ground level foundation. Moreover, the shaft 1 and the sub-frame 4 that compose the main frame
And a plurality of dampers 6 arranged in the vertical direction are connected in the horizontal direction (above, the invention described in claim 1).

In the above-described cable-reinforced seismic isolation structure, the magnitude of the pre-tension introduced into the cable 3 has the effect of suppressing the seismic response deformation of the seismic isolation structure, particularly the lifting and pulling-out force of the subframe 4. Set to size. Although the reaction force of the cable 3 is not specifically shown, it is processed by an underground anchor prepared individually or by a self-balancing method using the vertical load of the seismic isolation structure. Processed (the invention according to claim 5).

In the seismic isolation structure having the above-mentioned structure, as a seismic response in which the horizontal force is predominant, the displacement of the main frames 1 and 2 is suppressed by the tension of the cable 3 as shown in the conceptual diagram in FIG. The frame 4 exhibits horizontal seismic isolation response that is soft in the horizontal direction according to the horizontal rigidity of the upper and lower seismic isolation layers 5 and the damping action of the damper 6. Moreover, since the shaft 1 of the main frame and the subframe 4 having different periodic characteristics are connected by the damper 6, it is possible to attenuate the response of both with respect to the horizontal load.

As mentioned above, the seismic isolation structure of the present invention is
Since the main frames 1 and 2 mainly bear the horizontal load, it is possible to construct the sub frame 4 that stands side by side independently of the main frame with a lighter structure than an ordinary building. Therefore, implementation of laminated structure by simple frame with precast concrete members, or uniformization of members (lamination of culvert structure)
It is possible to improve the workability.

On the other hand, in the case of an earthquake response in which harmful lifting and pulling force are outstanding, the shaft 1 and its top girder 2 reinforced by the cable 3 which is the main frame and the subframe 4 are attached.
Uplifting and pulling out are suppressed through the seismic isolation layer 5 at the upper end of, and bending deformation of the subframe 4 is suppressed. Therefore, it is possible to further isolate the tall buildings and buildings with a large tower ratio.

The rigidity of the seismic isolation structure can be adjusted by adjusting the magnitude of the pretension introduced to the cable 3.
It is also possible to control lifting and pulling.

Next, FIG. 3 and FIG. 4 show an embodiment of a cable-reinforced seismic isolation structure having a multilayer structure according to the second aspect of the present invention.

This seismic isolation structure is also used for high-rise or super high-rise buildings,
Alternatively, it has many common points with the invention of claim 1 in that it is a cable-reinforced seismic isolation structure that suppresses deformation of the seismic isolation structure having a large tower-like ratio by the reinforcing effect of the cable.

That is, a bending-deformation-reducing main frame composed mainly of a shaft 1 having a structure for resisting horizontal force, and cables 30 and 31 installed in an arrangement for suppressing horizontal deformation of the shaft 1 and having pretension introduced therein, It is configured in combination with the subframe 4 constructed in a side-by-side structure independent of the main frame.

However, as means for making the subframe 4 multi-layered,
In addition to the top girder 2 on the top of the shaft 1, a plurality of horizontal intermediate girders 20 are provided for each layer, in the case of FIG. 4, two upper and lower stages are provided, and the subframe 4 is composed of three layers. By using the top girder 2 and the intermediate girder 20, the subframe 4 of each layer is also configured to have the seismic isolation layer 5 at the top and bottom. The sub frames 4 of the respective layers are horizontally connected to the main frame shaft 1 by a plurality of dampers 6 arranged vertically.

The cables constituting the main frame for reducing the bending deformation are an outer cable 30 for vertically connecting the outer peripheral portions of the top girder 2 and each intermediate girder 20 to the ground foundation portion, and the outer periphery of the first intermediate girder 20 on the ground. Symmetrical C-shaped arrangement between the part and the shaft root of the intermediate girder 20 immediately above (second step), and between the outer peripheral part of the second intermediate girder 20 and the shaft root of the top girder 2 immediately above. It is configured in combination with the inner cable 31 installed in. Outer cable 30
Introducing an appropriate amount of pretension to each of the inner cable 31 and the inner cable 31 to reinforce the main frame and adjust the rigidity is the same as in the first embodiment. Regarding the outer cable 30, it is also effective to implement the outer cable 30 in a V-shaped arrangement, as in the embodiment shown in FIGS.

Also in the case of this embodiment, the planar arrangement of the main frame and the subframe 4 is symmetrical with respect to the shaft 1 as shown in FIG. 2B.

[0033]

The effects of the present invention are as follows. The cable-reinforced seismic isolation structure according to the invention described in claims 1 to 5 is of a sub-frame structure constructed by arranging a main frame structure with cables and a side-by-side structure independent of the main frame structure. Since seismic isolation layers are provided on the top and bottom, and the subframe and the main frame are connected horizontally by dampers, the horizontal rigidity of the seismic isolation layer will not be adversely affected even though the structure is made higher.
A certain level of seismic isolation performance is demonstrated.

Further, since the main frame structure reinforced with cables effectively suppresses the lifting and pulling out of the sub frame structure, it is possible to seismically isolate a higher-rise building or a structure having a large tower ratio. is there.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a single-layer cable-reinforced seismic isolation structure according to the present invention.

FIG. 2A is an elevation view of the embodied single-layer cable-reinforced seismic isolation structure, and B is a plan layout view.

FIG. 3 is a conceptual diagram of a multi-layer cable-reinforced seismic isolation structure according to the present invention.

FIG. 4 is an elevation view of the embodied multilayered cable-reinforced seismic isolation structure.

5A and 5B are explanatory views showing a conventional seismic isolation structure that exhibits a rigid behavior.

FIG. 6A and FIG. 6B are explanatory views showing a conventional seismic isolation structure that causes a floating behavior due to bending deformation.

[Explanation of symbols]

3, 30, 31 cable 1 shaft 4 subframe 5 seismic isolation layer (seismic isolation support) 6 damper 2 top girder 20 Intermediate girder

Continued front page    (72) Inventor Ryuta Hirose             8-21-21 Ginza, Chuo-ku, Tokyo Stock market             Takenaka Corporation Tokyo Main Store (72) Inventor Yosuke Suzuki             8-21-21 Ginza, Chuo-ku, Tokyo Stock market             Takenaka Corporation Tokyo Main Store (72) Inventor Sou Daisaku             8-21-21 Ginza, Chuo-ku, Tokyo Stock market             Takenaka Corporation Tokyo Main Store (72) Inventor Masayoshi Nakai             8-21-21 Ginza, Chuo-ku, Tokyo Stock market             Takenaka Corporation Tokyo Main Store (72) Inventor Kazuo Aoki             8-21-21 Ginza, Chuo-ku, Tokyo Stock market             Takenaka Corporation Tokyo Main Store

Claims (5)

[Claims] 1. A shaft reinforcement having a structure mainly resisting horizontal force in a cable-reinforced seismic isolation structure for suppressing deformation of a high-rise building or a super-high-rise building or a seismic isolation structure having a large tower ratio by a cable, and the shaft. The main structure is a combination of a bending-deformation-reducing main frame that is installed in a position that suppresses horizontal deformation and that has pre-tension introduced, and a sub-frame structure that is independent of the main frame and that has a side-by-side structure. A seismic isolation structure with cable reinforcement, in which seismic isolation layers are provided above and below the frame, and the main and secondary frames are connected by dampers. 2. In a seismic isolation structure for cable reinforcement, which suppresses deformation of a high-rise building or a super-high-rise building or a seismic isolation structure having a large tower ratio, a shaft mainly having resistance to horizontal force, and the shaft. The main structure is a combination of a bending-deformation-reducing main frame that is installed in a position that suppresses horizontal deformation and that has pre-tension introduced, and a sub-frame structure that is independent of the main frame and that has a side-by-side structure. A cable-reinforced seismic isolation structure characterized in that seismic isolation layers are provided above and below and in the middle of the frame, and the main and secondary frames are connected by dampers. 3. The cable-reinforced seismic isolation structure according to claim 1 or 2, wherein the sub-frame structure has a single-layer or multi-layer structure. 4. The cable reinforcement according to any one of claims 1 to 3, wherein the multi-layered sub-frame is constructed between layers of a top girder and an intermediate girder prepared in the main frame. Seismic isolation structure. 5. The pretension reaction force introduced into the cable is treated by an individual underground anchor or by self-balancing in the entire structure, according to claim 1 or 2. Seismic isolation structure with cable reinforcement.