JP4454119B2 - Seismic isolation building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base-isolated building to which a base-isolating structure that suppresses stress and deformation by insulating vibration transmitted from the ground during an earthquake.
[0002]
[Prior art]
Conventional seismic isolation buildings of this type include those composed of a foundation structure (sometimes including the lower structure and pile foundation structure, the same shall apply hereinafter), an upper structure, and a seismic isolation layer provided between them. is there.
[0003]
According to such a base-isolated building, since the base-isolated support provided in the base isolation layer makes it difficult to transmit the vibration transmitted to the base structure to the upper structure, it is possible to reduce stress and deformation generated in the upper structure during an earthquake.
[0004]
[Problems to be solved by the invention]
However, in this type of base-isolated building, the force to resist the overturning moment received by the superstructure during an earthquake is considerably small, and therefore it is practically quite applicable to buildings with a high aspect ratio and high-rise buildings. Have difficulty.
[0005]
Therefore, the problem to be solved by the present invention can considerably increase the force to resist the overturning moment received by the superstructure during an earthquake, and thus can be applied to buildings with a high aspect ratio and high-rise buildings. The purpose is to provide a seismically isolated building.
[0006]
[Means for Solving the Problems]
The base-isolated building according to the present invention is a base-isolated building including a base structure, an upper structure, and a base-isolated layer provided therebetween, and is in the vicinity of the base-isolated layer and related to the outer periphery of the upper structure. A saddle-shaped weight that resists the overturning moment received by the upper structure at a portion, and the weight extends horizontally from a portion related to the outer periphery of the upper structure with a length equal to or higher than the floor height of the upper structure. It is characterized by surrounding the upper structure .
[0007]
According to the base-isolated building according to the present invention, since it has a bowl-shaped weight in the vicinity of the base isolation layer, which is a portion related to the outer periphery of the superstructure, it is intended to resist the overturning moment that the superstructure receives during an earthquake. The power to do can be increased considerably.
[0008]
Therefore, the base-isolated building according to the present invention can be applied to a building having a large aspect ratio or a high-rise building.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is a cross-sectional view showing a schematic configuration of a base-isolated building according to an embodiment of the present invention, and FIG. 2 is a view in the direction of arrow A in FIG. 1 showing the schematic configuration of the base-isolated building. In FIG. 2, reference numeral 2b denotes a casing in the upper structure.
[0010]
In the present embodiment, as shown in these drawings, the base-isolated building includes a lower structure 1 that is a basic structure, an upper structure 2, and a base-isolated layer 3 provided therebetween. Hereinafter, each component will be described.
[0011]
(1) Substructure 1
The lower structure 1 plays a role of reliably transmitting the vertical force transmitted from the upper structure 2 to the ground J. The substructure 1 may be a direct foundation or a pile foundation, regardless of the construction method, materials used, and the like.
[0012]
(2) Superstructure 2
In the present embodiment, the upper structure 2 is configured as an upper structure 2 that is a high-rise building. This is because the present invention is particularly suitable for a high-rise building or a building with a large aspect ratio in which the magnitude of the overturning moment tends to be remarkable during an earthquake.
[0013]
However, the object of application of the present invention is not limited to these, and it is necessary to prevent the upper structure 2 from falling as long as a falling moment occurs in the upper structure 2 during an earthquake. Since it can be said that it is necessary to suppress the generated stress and deformation, it is meaningful to apply the present invention.
[0014]
In the present embodiment, there is provided a counterweight 2a having a bowl-like shape that resists the overturning moment received by the upper structure 2 in the vicinity of the seismic isolation layer 3 and on the outer periphery of the upper structure 2. Yes.
[0015]
According to this, since the upper structure 2 is provided with the counterweight 2a, the force for resisting the overturning moment received by the upper structure 2 at the time of an earthquake can be considerably increased by utilizing the gravity of the counterweight 2a. Can do.
[0016]
Here, the reason why the counterweight 2a is provided in the vicinity of the seismic isolation layer 3 is to prevent the gravity related to the counterweight 2a from exerting an action that increases the overturning moment received by the upper structure 2. is there.
[0017]
Further, the counterweight 2a is provided in the portion related to the outer periphery of the upper structure 2 by increasing the distance from the center point of the overturning moment to the gravity action line related to the counterweight 2a as much as possible. The resistance moment caused by the counterweight 2a, which is a force to resist the overturning moment received by the counterweight 2a, is increased.
[0018]
According to this, compared with the case where the counterweight 2a is simply provided directly above the seismic isolation layer 3, the resistance moment obtained per unit weight is increased, and the gravity related to the counterweight 2a is efficiently utilized. It will be.
[0019]
(3) Seismic isolation layer 3
The seismic isolation layer 3 in the present embodiment is provided with a laminated rubber 3a serving as a seismic isolation support. The laminated rubber 3a plays a role of minimizing stress and deformation that will occur in the superstructure 2 during an earthquake.
[0020]
By the way, the laminated rubber 3a contributes little to resisting the overturning moment received by the upper structure 2 during an earthquake. That is, the laminated rubber 3a can hardly exert a force to resist the pulling force that is generated in the laminated rubber 3a when the upper structure 2 receives a tipping moment during an earthquake.
[0021]
However, in the present embodiment, since the upper structure 2 is provided with the counterweight 2a, not only can the resistance force against the overturning moment be increased by utilizing the gravity associated with the counterweight 2a, but also the layers can be stacked during an earthquake. The pulling force generated in the rubber 3a can also be reduced.
[0022]
The object of application of the present invention is not limited to the laminated rubber 3a, and is appropriately selected from a sliding method, an elastic support method, and the like according to the required level of safety, the type of the superstructure 2, and the like. be able to.
[0023]
Therefore, according to the base-isolated building according to the present embodiment, the upper structure 2 receives the upper structure 2 at the time of the earthquake because it is a portion related to the outer periphery of the upper structure 2 and includes the bowl-shaped counterweight 2a in the vicinity of the base isolation layer 3. The resistance moment acting on the overturning moment can be considerably increased.
[0024]
【The invention's effect】
According to the base-isolated building according to the present invention, since it is configured as described above, it is possible to considerably increase the resistance to the overturning moment that the superstructure receives during an earthquake. Therefore, it can be applied to buildings and high-rise buildings with a large aspect ratio.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of a base-isolated building according to an embodiment of the present invention.
2 is a view in the direction of arrow A in FIG. 1 showing a schematic configuration of the base-isolated building according to the embodiment of the present invention.
[Explanation of symbols]
1 ... Substructure (basic structure)
2 ... Superstructure 2a ... Counterweight 2b ... Housing 3 ... Seismic isolation layer 3a ... Laminated rubber J ... Ground

Claims (1)

In a base-isolated building consisting of a base structure, a superstructure, and a base isolation layer provided between them,
Comprising a collar-shaped weigh to resist overturning moments upper structure is subjected in a portion of the outer periphery of the upper structure in the vicinity of the base isolation layer,
The seismic isolation building, wherein the weight extends horizontally from a portion related to the outer periphery of the upper structure and has a length equal to or higher than a floor height of the upper structure and surrounds the upper structure .

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