JP5316892B2 - Vertical motion isolation structure - Google Patents

Description

  The present invention relates to a vertical motion seismic isolation structure capable of increasing the natural period of vertical vibration of an upper floor.

2. Description of the Related Art Conventionally, as a seismic isolation device used for a seismic isolation structure, an air spring corresponding to vertical movement due to vibration during an earthquake is known (for example, see Patent Document 1).
In Patent Document 1, an airtight chamber surrounded by a seal member is formed between upper and lower members, and a horizontal force transmission plate is provided to partition an upper portion and a lower portion of the airtight chamber. An air spring seismic isolation device provided with a guide mechanism and a spring member for supporting the distance between the member and the horizontal force transmission plate to be kept constant and having a damper in the lower hermetic chamber is described.

JP 2006-299524 A

However, conventional air springs used in seismic isolation structures that suppress vertical vibrations are large and expensive due to air pressure limitations such as a small permissible load per area, and vibration control for vertical movement is also possible. It is difficult and difficult to apply to high-rise buildings.
In the case of an air spring, it is necessary to manage the compressor so that it can always operate well, and since a great deal of labor is required for the maintenance, it is possible to cope with vertical movement without using an air spring. There was a need for a suitable seismic isolation structure.

The present invention has been made in view of the above-described problems, and by utilizing the deflection of the support beam on the intermediate floor, the natural period of the vertical vibration of the upper floor above the support beam can be increased, and excellent seismic isolation The object is to provide a vertical motion seismic isolation structure that can be effective.
Another object of the present invention is to provide a vertical motion seismic isolation device that can reduce the labor required for maintenance and can maintain stable performance over a long period of time.

  In order to achieve the above object, in the vertical motion seismic isolation structure according to the present invention, the supporting beam provided on the intermediate floor, the lower pillar disposed on the lower floor from the intermediate floor, and the upper layer disposed on the upper floor from the intermediate floor. The upper column is erected at an intermediate support point in the middle of the lower column in the support beam, and a damper is connected between the lower column and the vicinity of the intermediate support point of the support beam. It is characterized by.

In the present invention, the upper and lower displacements generated at the intermediate support point of the support beam during an earthquake are positively increased by adopting a structure in which the upper column is provided between the lower layer columns (intermediate support points) in the support beam provided on the intermediate floor. In addition, it is possible to control the damping by absorbing the vertical movement of the support beam by the damping action of the damper provided on the lower floor, and the natural period of the vertical vibration of the upper floor can be increased by the bending of the support beam. For this reason, it is possible to greatly suppress the vibration during the earthquake that occurs in the building, and it is possible to realize an excellent vertical motion isolation structure.
Further, since the seismic isolation structure uses a damper that is not an air spring, there is an advantage that vibration control with respect to vertical movement is easier than in the case of using an air spring. Furthermore, unlike the air spring, it is not necessary to manage the compressor, and the maintenance work can be reduced.

Moreover, in the vertical motion seismic isolation structure according to the present invention, it is preferable that the damper fixed in the vicinity of the intermediate support point of the support beam is disposed in a state in which the damping direction is inclined with respect to the horizontal plane.
In the present invention, not only the vertical movement that occurs in the support beam, but also the horizontal movement that occurs between the lower floor and the support beam can be given a damping action by the damper, and a higher seismic isolation effect can be obtained. it can.

According to the vertical motion seismic isolation structure of the present invention, by shifting the position of the lower column and the upper column, the vertical displacement generated at the intermediate support point of the support beam provided on the intermediate floor during the earthquake is positively It is possible to control the vertical movement of the support beam with a larger damper on the lower floor, and it is possible to increase the natural period of the vertical vibration of the upper floor due to the bending of the support beam. An effect can be obtained.
In addition, since a special structure such as an air spring is not required, the labor required for maintenance can be reduced, and stable performance can be maintained over a long period of time.

1 is an elevational sectional view showing an overall schematic configuration of a vertical motion seismic isolation structure 1 according to an embodiment of the present invention. It is a figure for demonstrating the vibration suppression effect | action of the vertical motion seismic isolation structure 1, Comprising: (a) is a figure of the state which the support beam was displaced below, (b) is a figure of the state where the support beam was displaced upwards is there.

Hereinafter, a vertical motion isolation structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the vertical motion isolation structure 1 according to the present embodiment is intended for a high-rise building including a lower floor 1 </ b> A and an upper floor 1 </ b> B having different structures across a predetermined intermediate floor R.

  In the structure of the lower floor 1A, four lower-layer pillars 2 are arranged at a predetermined interval (reference L1), and the upper ends of the lower-layer pillars 2 are joined by support beams 3 provided on the intermediate floor R. In the structure of the upper floor 1B, three upper-layer columns 4 are arranged on the support beam 3 with a predetermined interval (reference L2).

  Each upper-layer column 4 is erected at an intermediate support point P (P1, P2, P3) at a substantially intermediate position between the lower-layer columns 2 and 2 of the support beam 3, and the plane position is shifted from the lower-layer column 2. . That is, in the vertical motion seismic isolation structure 1, the upper column 4 is erected at the intermediate support point P in the support beam 3, so that the upper support column 3 acting at the time of the earthquake moves up and down at the intermediate support point P of the support beam 3. The displacement in the vertical direction is the largest, and the structure is easy to bend up and down (see FIGS. 2A and 2B).

  Further, on the lower floor 1A, a damper 5 having one end 5a connected to the side surface of the lower pillar 2 and the other end 5b connected to the vicinity of the intermediate support point P on the lower surface side of the support beam 3 has a damping direction (shown in FIG. 1). E direction) is provided in each lower pillar 2 in a state in which it is directed obliquely with respect to the horizontal plane. As this damper 5, for example, a viscoelastic damper can be employed.

  As shown in FIGS. 2 (a) and 2 (b), in the vertical motion seismic isolation structure 1 configured in this way, between the lower pillars 2 and 2 (intermediate support points P1, With the structure in which the upper column 4 is provided in each of P2 and P3), the vertical displacement generated at the intermediate support point P of the support beam 3 at the time of an earthquake is positively increased, and the damper 5 provided on the lower floor 1A It is possible to control the damping by absorbing the vertical movement of the support beam 3 by the damping action, and the natural period of the vertical vibration of the upper floor 1B can be increased by the bending of the support beam 3. For this reason, it is possible to greatly suppress the vibration during the earthquake that occurs in the building, and it is possible to realize an excellent vertical motion isolation structure.

  Moreover, since it is a seismic isolation structure using the damper 5 which is not an air spring, there exists an advantage that the vibration control with respect to the motion of an up-down movement is easy compared with the case where an air spring is used. Furthermore, unlike the air spring, it is not necessary to manage the compressor, and the maintenance work can be reduced.

  Further, in the vertical motion seismic isolation structure 1, since the damper 5 fixed in the vicinity of the intermediate support point P is disposed in an oblique direction, not only the vertical motion generated in the support beam 3 but also the lower floor 1A and the support are supported. A damping action can be imparted to the horizontal movement relative to the beam 3 by the damper 5, and a higher seismic isolation effect can be obtained.

  And since the vertical motion seismic isolation structure 1 can change the position of a pillar according to the construction plan, it is suitable for a building in which the use is different between the upper and lower floors.

  As described above, in the vertical motion seismic isolation structure according to the present embodiment, the intermediate support point P of the support beam 3 provided on the intermediate floor R at the time of the earthquake is configured by shifting the positions of the lower column 2 and the upper column 4. The vertical displacement generated in (P1, P2, P3) can be positively increased, and the damper 5 provided on the lower floor 1A can be used for damping control of the vertical movement of the support beam 3, and the bending of the support beam 3 can be controlled. Thus, the natural period of the vertical vibration of the upper floor 1B can be increased, and an excellent seismic isolation effect can be obtained.

As mentioned above, although the embodiment of the vertical motion seismic isolation structure according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.
For example, in the present embodiment, the damper 5 is disposed so that the damping direction is oblique with respect to the support beam 3 and has a seismic isolation structure corresponding to vertical and horizontal movements. However, the present invention is not limited to this. Absent. In other words, it is possible to arrange the damper in the vertical direction so that only the vertical movement of the support beam 3 can be handled. In this case, in addition to the damper, another seismic isolation device corresponding to the horizontal movement may be provided.

In addition, the configuration such as the performance, quantity, and arrangement of the damper can be appropriately set according to the structural conditions of the structure (building).
In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined.

1 Vertical seismic isolation structure 1A Lower floor 1B Upper floor 2 Lower floor pillar 3 Supporting beam 4 Upper floor pillar 5 Damper P, P1, P2, P3 Intermediate support point R Intermediate floor

Claims (2)

A supporting beam provided on an intermediate floor, a lower pillar disposed below the intermediate floor, and an upper pillar disposed above the intermediate floor,
The upper layer column is erected at an intermediate support point at a substantially intermediate position between the lower layer columns of the support beam,
A vertical motion isolation structure characterized in that a damper is connected between the lower column and the vicinity of the intermediate support point of the support beam. The vertical motion isolation structure according to claim 1, wherein the damper fixed in the vicinity of the intermediate support point of the support beam is disposed in a state in which a damping direction thereof is directed obliquely with respect to a horizontal plane. .

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