JP2011069149A - Seismic isolation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To damp vertical vibration, and to make a seismic isolation system into a simple constitution. <P>SOLUTION: The seismic isolation system includes between a support part 2 supported by the ground G and a structure 3 disposed on the support part 2: a plurality of first seismic isolation devices 4 installed on the upper part 2a of the support part 2; a plurality of second seismic isolation devices 5 installed at the lower part of the structure 3; and a plurality of connecting members 7 connecting the first and second seismic isolation devices 4, 5 respectively. The plurality of connecting members 7 are arranged in a concyclic manner, and upper end surfaces 7a thereof have a tapered surface 6a respectively. The first seismic isolation devices 4 is elastically displaced in a horizontal direction. The second seismic isolation devices 5 is elastically displaced along the tapered surface 6a in its radial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation system for a structure, and more particularly to a seismic isolation system that attenuates vibrations in the vertical direction.

Conventionally, seismic isolation devices have been developed that attenuate vertical vibrations in addition to horizontal vibrations. Such a seismic isolation device includes horizontal seismic isolation means for attenuating horizontal vibration and vertical seismic isolation means for attenuating vertical vibration.
Further, according to Patent Document 1, the seismic isolation means that elastically expands and contracts to perform seismic isolation and elastically displaces and performs seismic isolation on a plane orthogonal to the expansion and contraction direction. Connect one end of the expansion / contraction direction to the seismic isolation body and the other end of the expansion / contraction direction as a foundation so as to be inclined with respect to the vertical line passing through the center of gravity of the seismic isolation body. A three-dimensional seismic isolation device is disclosed that performs seismic isolation in the horizontal and vertical directions by this seismic isolation means. In this three-dimensional seismic isolation device, the crossing angle between the expansion and contraction direction of the seismic isolation means and the vertical line is determined from the expansion and contraction direction of the seismic isolation means, the spring constant in the direction orthogonal to the expansion and contraction direction, and the center of gravity of the base isolation body. It is determined based on the vertical distance to one end of the means and the horizontal distance from the vertical line passing through the center of gravity of the seismic isolation body to one end of the seismic isolation means.

JP-A-8-177970

  However, there are few types of conventional seismic isolation means for attenuating vertical vibrations, and most of the mechanisms are complicated. Further, in a seismic isolation device including a horizontal seismic isolation means and a vertical direction seismic isolation means, the mechanism of each seismic isolation means becomes complicated and large, and a large installation space is required.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a seismic isolation system with a simple configuration that can attenuate vertical vibrations.

  In order to achieve the above object, a seismic isolation system according to the present invention is provided between a ground or a support part such as a foundation supported by the ground or a floor of a building, and a structure disposed on the support part. A plurality of first seismic isolation devices installed at the upper part of the support, a plurality of second seismic isolation devices installed at the lower part of the structure, And a plurality of connecting members respectively connecting the second seismic isolation devices, wherein the plurality of connecting members are arranged, and an inclination is inclined toward the center of the plurality of connecting members in which upper end surfaces thereof are arranged. The first seismic isolation device is elastically displaced in the horizontal direction, and the second seismic isolation device is elastically displaced along the inclination direction of the inclined surface. To do.

In the present invention, the first seismic isolation device is elastically displaced in the horizontal direction, so that the horizontal vibration transmitted from the support portion to the structure in the event of an earthquake can be attenuated, and the connecting member is in the horizontal direction. It is allowed to displace elastically.
The plurality of connecting members are arranged to form an inclined surface that is inclined toward the center of the plurality of connecting members on which the upper end surfaces are arranged, so that the support portion is changed to the structure by the vibration of the earthquake. When an external force in the up and down direction is applied, each connecting member is horizontally displaced in the direction from the center to the outside and from the outside to the center, and the second seismic isolation device is deformed along the inclination direction of the inclined surface. At the same time, the first seismic isolation device is deformed in the horizontal direction to absorb the external force in the vertical direction.

In the case where the upper end surface of the connecting member constitutes an inclined surface that is inclined downward toward the center of the plurality of connecting members arranged, an upward external force from the support portion toward the structure due to earthquake vibration As a result, each connecting member is horizontally displaced in the direction from the center to the outside, the second seismic isolation device is deformed along the inclination direction of the inclined surface, and the first seismic isolation device is horizontal It is deformed to absorb the upward external force.
Also, when a downward external force that pulls the structure to the support side due to earthquake vibration acts, each connecting member is displaced horizontally in the direction from the outside toward the center, and the second seismic isolation device is inclined. The first seismic isolation device is deformed in the horizontal direction to absorb the downward external force.
Then, the plurality of arranged connecting members are displaced in the horizontal direction in the direction away from the center from the outside and in the direction approaching the center from the outside, and the first and second seismic isolation devices are elastically displaced. By doing so, the vibration of the up-down direction transmitted from a support part to a structure can be attenuated.

Further, in the case of configuring an inclined surface that is inclined upward toward the center of the plurality of connecting members in which the upper end surfaces of the connecting members are arranged, the upward direction from the support portion to the structure is caused by the vibration of the earthquake. When an external force is applied, the connecting members are horizontally displaced in the direction from the outside toward the center, the second seismic isolation device is deformed along the inclination direction of the inclined surface, and the first seismic isolation device is horizontal. It is deformed in the direction to absorb the upward external force.
In addition, when a downward external force that pulls the structure to the support side due to the vibration of the earthquake acts, each connecting member is displaced horizontally from the center to the outward direction, and the second seismic isolation device is inclined. The first seismic isolation device is deformed in the horizontal direction to absorb the downward external force.
The plurality of arranged connecting members are displaced horizontally in the direction approaching the center from the outside and the direction separating away from the center, and the first and second seismic isolation devices are elastically displaced. By doing so, the vibration of the up-down direction transmitted from a support part to a structure can be attenuated.
Moreover, since the seismic isolation system of this invention is the structure which connected the 1st seismic isolation apparatus and the 2nd seismic isolation apparatus with the connection member in which the inclined surface was formed in the upper surface, it is possible to make the seismic isolation system into a simple structure. can do.

In the seismic isolation system according to the present invention, the plurality of connecting members are arranged in a circumferential direction or on a pair of opposing sides of a rectangle.
In the present invention, the plurality of connecting members are arranged on the circumferential direction or a pair of opposing sides of the rectangle, so that the external force due to the vibration of the earthquake can be efficiently absorbed.

In the seismic isolation system according to the present invention, the structure and the support portion are connected by a first damper that controls displacement in the vertical direction.
In the present invention, the structure and the support portion are connected by the first damper that controls the displacement in the vertical direction, so that the amount of vertical deformation of the structure during an earthquake can be adjusted and The natural period of the direction can be adjusted.

In the seismic isolation system according to the present invention, the connecting members are connected by a second damper that controls displacement in the horizontal direction.
In the present invention, since the connecting members are connected by the second damper that controls the displacement in the horizontal direction, the displacement amount between the connecting members can be adjusted, and the natural period in the vertical direction of the structure can be adjusted. Can do. Further, the second damper can absorb the energy of vibration in the horizontal direction.

In the seismic isolation system according to the present invention, the connecting member and the support portion are connected by a third damper that controls horizontal displacement.
In the present invention, since the connecting member and the support portion are connected by the third damper that controls the displacement in the horizontal direction, the displacement amount of the connecting member can be adjusted, and the vertical and horizontal directions of the structure can be adjusted. The period can be adjusted. Further, the third damper can absorb the vibration energy in the horizontal direction.

  According to the present invention, the first and second seismic isolation devices and the coupling member that couples the first and second seismic isolation devices are provided between the support portion and the structure, and the coupling member is By displacing in the horizontal direction simultaneously with the direction away from the center of the inclined surface and the approaching direction, the first and second seismic isolation devices absorb the vertical vibration transmitted from the support part to the structure, and the vertical direction It is possible to suppress the damage of the structure against the seismic motions of the earthquake and to provide a simple seismic isolation system.

(A) is a figure which shows an example of the seismic isolation system by 1st embodiment of this invention, (b) is the sectional view on the AA line of (a). (A) is a figure explaining operation | movement of the seismic isolation system by 1st embodiment of this invention, (b) is BB sectional drawing of (a). (A) is a figure explaining other operation | movement of the seismic isolation system by 1st embodiment of this invention, (b) is CC sectional view taken on the line of (a). It is a figure which shows an example of the seismic isolation system by 2nd embodiment of this invention. It is a figure which shows an example of the seismic isolation system by 3rd embodiment of this invention. (A) thru | or (c) is a figure explaining the seismic isolation system by the modification of embodiment of this invention.

(First embodiment)
Hereinafter, the seismic isolation system according to the first embodiment of the present invention will be described with reference to FIGS.
As shown to Fig.1 (a), the seismic isolation system 1a by 1st embodiment is structures, such as a structure arrange | positioned above the support part 2 supported by the ground G, and the support part 2. As shown in FIG. 3, a first seismic isolation device 4 disposed on the upper surface 2 a of the support portion 2, a second seismic isolation device 5 connected to the bottom of the structure 3, and a first It is roughly comprised from the connection member 7 which connects the seismic isolation apparatus 4 and the 2nd seismic isolation apparatus 5. FIG.

The support portion 2 is a reinforced concrete slab or the like installed on the ground G. The lower ground G has a foundation pile embedded or ground improved as necessary, and a structure 3 disposed above. It has a structure that can support.
The structure 3 has a convex taper surface 3a inclined upward from the center to the outer periphery at the bottom, and the second seismic isolation device 5 is connected to the taper surface 3a.

  As shown in FIG. 1 (b), four connecting members 7 are arranged on the same circumference at a predetermined interval, and these connecting members 7 constitute a connecting portion 6. As shown in FIG. 1A, the connecting portion 6 has a concave tapered surface (inclined surface) 6 a corresponding to the tapered surface 3 a of the structure 3 on the upper surface 7 a of the plurality of connecting members 7 arranged. The tapered surface 6a is inclined downward from the outer peripheral portion toward the central portion. The lower surface 7b of the connecting member 7 is formed horizontally.

In the connecting portion 6, an opening is formed at the center of the tapered surface 6 a, and a space 8 is formed from the upper surface 2 a of the support portion 2 to the bottom of the structure 3.
In the present embodiment, the connecting portion 6 includes four connecting members 7, but may not be the four connecting members 7 as long as the connecting portion 6 includes a plurality of connecting members 7.

A plurality of first seismic isolation devices 4 are disposed on the upper surface 2 a of the support portion 2 and are connected to the lower surface 7 b of the connecting member 7 by, for example, a laminated rubber bearing or a slider.
The first seismic isolation device 4 has a function of supporting the vertical load of the upper structure 3, the second seismic isolation device 5, the connecting member 7 and transmitting it to the support portion 2, and the connection member 7 and the support portion 2. It functions as an isolator that insulates the horizontal behavior and lengthens it.

  Similarly to the first seismic isolation device 4, the second seismic isolation device 5 is disposed on the upper surface of each connecting member 7 with a laminated rubber bearing, a slider, and the like, and the tapered surface 3 a of the structure 3. It is connected. The second seismic isolation device 5 is disposed between the tapered surface 3a of the structure 3 and the tapered surface 6a of the connecting portion 6, and is inclined in accordance with both the tapered surfaces 3a and 6a.

  The second seismic isolation device 5 insulates the function of supporting the vertical load of the upper structure 3 and transmitting it to the connecting member 7 and the behavior of the tapered surface 6a between the structure 3 and the connecting member 7 in the angular direction. It has a function as a periodic isolator. At this time, the horizontal behavior and the vertical behavior of the structure 3 and the connecting member 7 are insulated by having a function of insulating and lengthening the behavior of the tapered surface 6a between the structure 3 and the connecting member 7 in the angular direction. The period can be increased.

At this time, the displacement amount of the structure 3 and the connecting member 7 and the natural period of the structure 3 can be adjusted by adjusting the taper angles of the both tapered surfaces 3a and 6a.
The second seismic isolation device 5 is formed to have a rigidity that does not deform in the inclined direction of the tapered surface 6a with the load of the structure 3 in a normal state.
The first and second seismic isolation devices 4 and 5 may be provided with sliding bearings in addition to laminated rubber bearings and sliders.

Next, the operation of the seismic isolation system 1a according to the first embodiment described above will be described with reference to the drawings.
As shown in FIGS. 2 (a) and 2 (b), the seismic isolation system 1a is configured such that when an upward external force is applied from the ground G to the structure 3 side due to earthquake vibration, each connecting member 7 becomes the center of the connecting portion 6. The second seismic isolation device 5 is deformed along the taper surface 6a and the first seismic isolation device 4 is deformed in the horizontal direction. Is absorbed. At this time, when each connecting member 7 is horizontally displaced in the direction toward the outside of the connecting portion 6, the support portion 2 and the structure 3 come closer to the vertical direction.

  As shown in FIGS. 3A and 3B, the seismic isolation system 1a is configured such that when a downward external force that pulls the structure 3 to the ground G side due to the vibration of the earthquake acts, The second seismic isolation device 5 is deformed along the taper surface 6a and the first seismic isolation device 4 is deformed in the horizontal direction. Absorbs downward external force. At this time, when each connecting member 7 is horizontally displaced in the direction from the outside of the connecting portion 6 toward the center portion, the support portion 2 and the structure 3 are moved away in the vertical direction.

And by the effect | action of the seismic isolation system 1a mentioned above, when the vibration of the up-down direction of an earthquake is transmitted to the support part 2 from the ground G and the support part 2 is displaced upwards, the support part 2 and the structure 3 are perpendicular | vertical. When the support portion 2 is displaced downward when approaching the direction, the support portion 2 and the structure 3 are moved away from each other in the vertical direction, so that the displacement of the structure 3 is suppressed. It is possible to reduce vertical vibration.
Moreover, when the horizontal vibration from the ground G due to the earthquake is transmitted to the support portion 2, the first seismic isolation device 4 is elastically displaced in the horizontal direction to transmit the horizontal direction to the structure 3. Can be damped.

In the seismic isolation system 1a according to the first embodiment described above, the vertical vibration transmitted from the ground G to the structure 3 due to the earthquake can be reduced, so that damage to the structure 3 due to the vertical ground motion is suppressed. The effect to do.
Moreover, since the seismic isolation system 1a is a simple structure which connected the 1st and 2nd seismic isolation apparatuses 4 and 5 with the connection member 7 by which the taper surface 6a was formed in the upper surface, it can be installed at low cost.
Moreover, since the horizontal vibration transmitted from the ground G to the structure 3 due to the earthquake can be attenuated, damage caused by the horizontal ground motion can be suppressed.

  Next, other embodiments will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted. A configuration different from the embodiment will be described.

(Second embodiment)
As shown in FIG. 4, in the seismic isolation system 1 b according to the second embodiment, a first damper 11 such as an oil damper is provided between the structure 3 and the support portion 2. The first damper 11 is provided as a vibration control device that controls the vertical displacement between the structure 3 and the support 2.

  According to the seismic isolation system 1b according to the second embodiment, the same effect as that of the first embodiment can be obtained, and the first damper 11 is provided between the structure 3 and the support portion 2. Therefore, the amount of vertical displacement of the structure 3 can be adjusted, and the natural period of the structure 3 in the vertical direction can be adjusted.

(Third embodiment)
As shown in FIG. 5, in the seismic isolation system 1 c according to the third embodiment, a second damper 12 is provided between the connecting members 7, and the space between the outer peripheral portion of the connecting member 7 and the ground G. A third damper 13 is provided. The second and third dampers 12 and 13 are, for example, oil dampers.
The second damper 12 is provided as a vibration control device that controls the horizontal displacement between the connecting members 7, and the third damper 13 is a brake that controls the horizontal displacement between the connecting member 7 and the ground G. It is provided as a seismic device.

  According to the seismic isolation system 1c according to the third embodiment, the same effect as that of the first embodiment can be obtained, and the second damper 12 is provided between the connecting members 7 so that the outer periphery of the connecting member 7 can be obtained. Since the third damper is provided between the portion and the ground G, the horizontal displacement amount between the connecting members 7 and the horizontal displacement amount of the connecting members 7 can be adjusted, and the vertical of the structure 3 can be adjusted. The natural period in the direction and the vertical direction can be adjusted.

As mentioned above, although embodiment of the seismic isolation system by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the first embodiment described above, the support part 2 is a reinforced concrete slab supported by the ground G, but the ground G may be used as a support part, or a floor fixed to the floor or a floor of a building. It is good also as a support part.

In the above embodiment, the connecting members 7 are arranged at a predetermined interval on the same circumference. However, the connection members 7 are not limited to the same circumference, but on the elliptic circumference, as shown in FIG. , (B), they may be arranged on the outer periphery of a square or rectangle with a space therebetween. At this time, the upper surface of the connection member 7 is inclined downward toward the center of the plurality of connection members 7 arranged, and the second seismic isolation device is displaced along this inclination direction.
Moreover, the connection member 7 may be arranged on a pair of opposing sides of a rectangle as shown in FIG. The upper surface of the connection member 7 is inclined downward toward the center of the plurality of connection members 7 arranged (the virtual center line 21 in the figure), and the second seismic isolation device is along this inclination direction. Displace.

In addition, either or both of the second damper 12 and the third damper 13 according to the third embodiment may be installed in the second embodiment described above. One of the second damper 12 and the third damper 13 may be omitted. In this way, by combining the first, second, and third dampers 11, 12, and 13, the amount of displacement and the natural period in the vertical direction of the structure 3 can be adjusted.
In the third embodiment, the third damper 13 connects the outer peripheral portion of the connecting member 7 and the ground G. However, instead of the outer peripheral portion of the connecting member 7, the bottom or upper portion of the connecting member 7, etc. May be connected to the support portion 2 or the like instead of the ground G, and when the seismic isolation system of the present embodiment is built in a building, it may be connected to the floor of the building. It may be connected.
In the present embodiment, the tapered surface 6a is inclined downward from the outer peripheral portion toward the central portion, but the tapered surface 6a is inclined upward from the outer peripheral portion toward the central portion. It is good also as composition which has.

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Seismic isolation system 2 Support part 3 Structure 4 1st seismic isolation apparatus 5 2nd seismic isolation apparatus 6 Connection part 6a Tapered surface (inclined surface)
7 Connecting member 11 First damper 12 Second damper 13 Third damper

Claims (5)

A seismic isolation system provided between a support portion such as a ground or a floor supported by the ground or a floor of a building, and a structure disposed on the support portion,
A plurality of first seismic isolation devices installed on top of the support;
A plurality of second seismic isolation devices installed at the bottom of the structure;
A plurality of connecting members for respectively connecting the first and second seismic isolation devices, wherein the plurality of connecting members are arranged and inclined toward the center of the plurality of connecting members in which upper end surfaces thereof are arranged. The first seismic isolation device is elastically displaced in the horizontal direction, and the second seismic isolation device is elastically displaced along the inclination direction of the inclined surface. A seismically isolated system.   The seismic isolation system according to claim 1, wherein the plurality of connecting members are arranged in a circumferential direction or on a pair of opposing sides of a rectangle.   The seismic isolation system according to claim 1 or 2, wherein the structure and the support portion are connected by a first damper that controls displacement in a vertical direction.   The seismic isolation system according to any one of claims 1 to 3, wherein the connecting members are connected by a second damper that controls a displacement in a horizontal direction.   The seismic isolation system according to any one of claims 1 to 4, wherein the connecting member and the support portion are connected by a third damper that controls displacement in a horizontal direction.

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