JP3218520B2 - Building frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building frame structure capable of attenuating vibration energy due to an earthquake or the like.

[0002]

2. Description of the Related Art Damping performance is an important factor in the dynamic characteristics of a building. Therefore, various damping devices have been proposed to provide reliable damping performance.

[0003]

However, the conventional damping device requires a considerably large space and cost increase in order to provide a large stroke and energy absorption for contributing to the load-bearing safety of the whole building. Problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a frame structure of a building which does not require an additional space and has a large damping performance.

[0005]

According to a first aspect of the present invention, there is provided a frame structure of a building having a megastructure and a multi-story substructure arranged in a space surrounded by the megastructure. in Frame structure, together with the lower portion of the substructure is connected to the mega structures via the vibration damping device, pre
The floor of the substructure is
It is characterized by being linked to a megastructure .

According to a second aspect of the present invention, in the frame structure of a building according to the first aspect, the vibration damping device includes a soft member that maintains an elastic state even during an extreme earthquake, and a plastic member that elastically deforms during an earthquake. And a rigid member that deforms and absorbs most of the total energy of the earthquake.

According to a third aspect of the present invention, in the frame structure of a building according to the first aspect, the vibration damping device is formed by laminating seismic isolation rubber. And

[0008]

[0009]

According to the first aspect of the present invention, there is provided a building frame structure.
Disturbances due to earthquakes and wind loads are input from the megastructure to the substructure. At this time, the vibration is attenuated by the vibration damping device provided below the substructure, and the vibration is also attenuated by the deformation of the substructure. Therefore, as compared with the case where the vibration is attenuated only by the vibration damping device, the sub-structure itself is used as a part of the damping mechanism, so that the vibration damping device can be downsized and no additional space is required. At the same time, large damping performance can be provided. In addition, it is also damped by viscous damping devices
Therefore, the damping performance can be significantly improved.

According to the frame structure of the building according to the second aspect of the present invention, the vibration damping device is composed of the soft member and the rigid member, and the vibration such as an earthquake is transmitted to the substructure, and the substructure is largely deformed. Does occur, the substructure is only connected to the megastructure at the lower part and does not contact the outer wall, so there is no need to finish the outer wall to withstand large deformation.

According to the third aspect of the present invention, when a vibration such as an earthquake is input from the megastructure to the substructure, the vibration is attenuated by the relative displacement of the seismic isolation rubber.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A frame structure of a building according to an embodiment of the present invention will be described below with reference to the drawings.

The frame structure of this embodiment includes a megastructure 1 installed in a ladder shape on a foundation (not shown), and substructures 2 and 3 each having a multi-story structure installed in a space surrounded by the megastructure 1. A first vibration damping device 4 installed between the lower part of the substructure 2 and the megastructure 1, and the substructure 3
Second installed between the lower part of the building and megastructure 1
Vibration damping device 5 and substructures 2 and 3 floor 2
a, 3a and an access floor 6 installed between the infrastructure (not shown) installed in the megastructure 1
7 and viscous damping devices 8 and 9 provided on these access floors 6 and 7.

The first vibration damping device 4 includes a soft member 4a made of, for example, high-tensile steel having a high elasticity limit, which maintains an elastic state even during an extreme earthquake, and a large part of the total energy of the earthquake by plastically deforming during the earthquake. And a rigid member 4b made of, for example, mild steel or stainless steel. And the first
The strength of the substructure 2 disposed above the first vibration damping device 4 is set higher than the strength of the first vibration damping device 4. Thus, the first vibration damping device 4
Is relatively weaker than the strength of the substructure 2 disposed on the upper portion, and the total energy input during a large earthquake is concentrated on the first vibration damping device 4, and the rigidity of the first vibration damping device 4 is reduced. By plasticizing the member 4b, the total energy input of the earthquake is absorbed as plastic strain energy, so that the columns and beams, which are the main parts of the substructure 2, remain within the elastic limit even during an extreme earthquake.

The second vibration damping device 5 is a so-called laminated rubber seismic isolation device formed by laminating seismic isolation rubbers. Thus, when vibration such as an earthquake is transmitted from the megastructure 1 to the substructure 3, energy is absorbed by relative displacement of the laminated seismic isolation rubber.

The access floors 6 and 7 are provided with an infrastructure (not shown) installed in the megastructure 1 (for example,
Transportation such as equipment ducts and pipes or elevators)
And serves as an evacuation route at the time of disaster, which is connected to the floors 2a and 3a of the substructures 2 and 3.

In this embodiment, the first vibration damping device 4 and the second vibration damping device 5 are provided between the substructures 2 and 3 and the megastructure 1, respectively. Any one of the vibration damping device 4 and the second vibration damping device 5 may be used.

Next, the operation of the frame structure of the building of this embodiment will be described.

Disturbance due to an earthquake or wind load is input from the megastructure to the substructure. On this occasion,
Vibration is attenuated by first and second vibration damping devices 4 and 5 provided below the substructure. That is, according to the first vibration damping device 4, the total energy input of the earthquake is absorbed as plastic strain energy by plasticizing the rigid member 4b, and according to the second vibration damping device 5, the laminated seismic isolation Energy is absorbed by the relative displacement of the rubber. Further, the first and second vibration damping devices 4, 5
The vibration is attenuated by the deformation of the sub-structures 2 and 3 together with the operation of.

As described above, in the present embodiment, the first and second
Since the substructures 2 and 3 themselves are used as a part of the damping mechanism, as compared with the case where the vibration is damped only by the vibration damping devices 4 and 5, the first and second vibration damping devices 4 and 5 are used.
5 can be miniaturized, no additional space is required, and large damping performance can be provided.

According to the first vibration damping device 4, even if the sub-structure 2 undergoes a large deformation, the sub-structure 2 is only connected to the mega-structure 1 at the lower part and is connected to the outer wall (joined to the mega-structure 1). ), So there is no need to finish the outer wall to withstand large deformations. In other words, in general, when a building is greatly deformed due to an earthquake or the like, the structure supporting the outer wall is also deformed.
Requires special consideration, and development of an outer wall finish that can withstand large deformation is required. However, as in the present embodiment, the above-described consideration is not necessary because the substructure 2 does not support the outer wall.

In the frame structure of the building according to the present embodiment, vibration is inputted from the megastructure 1 to the substructures 2 and 3, and the substructures 2 and 3 are integrally deformed. It is attenuated by the deformation of the devices 4 and 5 and the substructures 2 and 3, and is also attenuated by the viscous damping devices 8 and 9. That is, since the deformation of the megastructure 1 is very small with respect to the deformation of the substructures 2 and 3, the megastructure 1 can be regarded as fixed with respect to the substructures 2 and 3; Each of the floors 2a and 3a is deformed in one direction or a different direction as a whole by the deformation of the first layer of the substructure. in this way,
Since the viscous damping devices 8 and 9 are added, the damping performance can be greatly improved.

Although the conventional seismic isolation structure is effective for medium-to-low-rise buildings, it is not so effective for super-high-rise buildings, and there is a limit to its application to high-rise buildings. Since the scales 2 and 3 are of middle to low floors, they can be applied as an efficient seismic isolation structure.

[0025]

As described above, according to the first aspect of the present invention,
According to the frame structure of a building described in the above, in a frame structure of a building including a megastructure and a substructure including a multi-story floor disposed in a space surrounded by the megastructure, a lower portion of the substructure is a vibration damping device. And connected to the megastructure through a viscous damping device.
Connected to the megastructure via a device
In the event of disturbances such as earthquakes and wind loads,
Entered in the substructure and the substructure
In addition to the vibration damping device provided at the bottom,
Is the vibration attenuated by the deformation of the char itself?
The megastructure and substructure
The sub-structure itself is used as a part of the damping mechanism, so that the vibration damping device can be downsized, no additional space is required and large damping performance is achieved. Can be made. Furthermore, it is damped by viscous damping devices.
Therefore, the damping performance can be greatly improved.

According to the frame structure of the building according to the second aspect of the present invention, in the frame structure of the building according to the first aspect, the vibration damping device includes: a soft member that maintains an elastic state even during an extreme earthquake; Since it is composed of a rigid member that sometimes undergoes plastic deformation and absorbs most of the total energy of the earthquake, even if vibrations such as earthquakes are transmitted to the substructure and large deformation occurs in the substructure, the substructure remains at the bottom. Since it is connected to the megastructure and does not contact the outer wall, there is no need to finish the outer wall to withstand large deformation.

[0027]

According to the frame structure of a building according to claim 3 of the present invention, in the frame structure of the building according to claim 1, the vibration damping device is formed by stacking seismic isolation rubber. When vibration such as an earthquake is input from the megastructure to the substructure, the vibration can be attenuated by the relative displacement of the seismic isolation rubber.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a frame structure of a building according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Megastructure 2,3 Substructure 4 First vibration damping device 4a Flexible member 4b Rigid member 5 Second vibration damping device 6,7 Access floor 8,9 Viscous damping device

Claims (3)

(57) [Claims] 1. A frame structure of a building having a megastructure and a substructure consisting of multiple floors arranged in a space surrounded by the megastructure,
Lower portion of the substructure is connected to the mega structures via the vibration damping device Rutotomoni, said support
Of the megastructure through a viscous damping device.
A frame structure of a building characterized by being connected to a structure. 2. The vibration damping device according to claim 1, wherein the vibration damping device comprises a soft member that maintains an elastic state even during an extreme earthquake, and a rigid member that plastically deforms during an earthquake to absorb most of the total energy of the earthquake. The frame structure of a building according to claim 1, wherein 3. The frame structure of a building according to claim 1, wherein said vibration damping device is formed by laminating seismic isolation rubber.