JPH0448287Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a seismic isolation support device for a structure that attenuates seismic energy transmitted from the foundation to its superstructure at a supporting part between the foundation and the structure. More specifically, the present invention relates to an improvement of the seismic isolation support device described in Japanese Patent Application Laid-Open No. 168875/1983.

Conventional technology In addition to increasing the strength of structures, seismic design methods for buildings and other structures include methods for dynamically treating the structure as a vibrating system and extending its vibration period to prevent earthquakes, etc. There are so-called seismic isolation or damping construction methods that reduce the response acceleration of a structure to external input.

As for the seismic isolation construction method, as illustrated in Fig. 7, a plurality of A support body 6 made of a laminated rubber body 5 in which a rubber elastic plate 3 and a plurality of metal plates 4 are alternately laminated and bonded in the vertical direction is interposed between the structure C and the foundation B, and the foundation B in the event of an earthquake is interposed between the structure C and the foundation B. There is a seismic isolation support device that is configured to elastically deform the laminated rubber body 5 of the support body 6 in accordance with the horizontal movement of the structure C, thereby reducing the corresponding acceleration of the structure C.

Next, the seismic isolation support device described in JP-A-60-168875 has a laminated rubber body 5 in which rubber elastic plates 3 and metal plates 4 are alternately laminated and bonded, as illustrated in FIG. A support body 6 consisting of the following structure is interposed between the structure C and the foundation B, and the structure C is supported on the foundation B. The movable resistance plate 7 provided integrally with the structure C is movable within the surrounding wall 9 of the fixed plate 8 fixed to the foundation B, and the lower surface of the movable resistance plate 7 and the upper surface of the fixed plate 8 A damping device 11 is arranged between the structure C and the foundation B. The damping device 11 is arranged so that a certain distance G is maintained between the structure C and the foundation B.

Problems to be solved by the present invention (I) In the seismic isolation support device shown in FIG. However, the relative displacement between structure C and foundation B increases.

Therefore, the laminated rubber body 5 may be damaged by an excessive horizontal load, and the structure of the support body 6 made of the laminated rubber body 5 alone is difficult to put into practical use as a seismic isolation structure.

() The seismic isolation support device shown in FIG. absorbing the structure C and reducing the relative displacement that occurs between the structure C and the foundation B to prevent excessive horizontal loads from acting on the laminated rubber body 5 of the support 6.
to protect effectively. Therefore, the problems described with respect to the apparatus shown in FIG. 7 above are solved. However, subsequent experiments revealed the following problem.

That is, elastic deformation in the vertical direction that occurs in the laminated rubber body 5 of the support 6 that supports the structure C, expansion and contraction deformation of the rubber elastic plate 3 of the laminated rubber body 5 that occurs due to changes in temperature, and furthermore, rubber deformation due to long-term vertical loads. A change in height occurs in the laminated rubber body 5 due to creep deformation of the elastic plate 3 or the like. This change in height causes a change in G between the lower surface of the movable resistance plate 7 and the upper surface of the fixed plate 8, and causes a change in the magnitude of the viscous shear resistance force.

Incidentally, the viscous shear resistance force of the viscous fluid 10 is determined by the viscosity coefficient of the viscous fluid 10 and the viscous fluid 10.
It is proportional to the area of two surfaces that perform relative motion via , as well as their relative velocity, and inversely proportional to the dimension of G between the two surfaces. Therefore, if the G between the lower surface of the movable resistance plate 7 and the upper surface of the fixed plate 8 is changed as described above, it will have a great effect on the magnitude of the viscous shear resistance force of the viscous fluid 10, and as a result, the seismic energy The absorption effect of structure C and the protection effect of structure C will change.

Therefore, this invention was devised to solve the problems of the seismic isolation support device shown in Figure 8 mentioned above. Even if the height of the laminated rubber body of the support body changes as described above, the distance between the lower surface of the movable resistance plate and the upper surface of the fixed base
The object of the present invention is to provide a seismic isolation support device for a structure that has an improved structure that can always ensure a certain period of time without causing any change in the structure.

Means for Solving the Problems As a means for solving the above-mentioned problems of the prior art, a seismic isolation support device for structures according to this invention is provided, examples of which are shown in FIGS. 1 to 6 of the drawings. As described above, the structure C is constructed by interposing the support body 20 made of a laminated rubber body 25 formed by laminating and bonding rubber elastic plates 23 and metal plates 24 alternately between the structure C and the foundation B. The structure is supported on the foundation B and is equipped with a damping device 26 that reduces the relative horizontal displacement that occurs between the structure C and the foundation B by the viscous shear resistance force generated by the viscous fluid 37. In the earthquake support device, the damping device 26 includes an upper plate 27 that is integrally provided on the lower surface of the structure C and has a vertical downward protrusion 28 on the lower surface, and a vertical plate 27 that is slidably fitted into the upper surface of the upper plate 27. A movable resistance plate 31 has an upwardly directed cylindrical recess 32 and is provided with a sliding member 33 of a predetermined height on its lower surface that slideably abuts on a fixed plate to be described later, and a movable resistance plate 31 fixed to the foundation B. The fixing plate 35 has a cylindrical surrounding wall 36 on its upper surface for containing a viscous fluid, and a viscous fluid 37 is filled into the surrounding wall 36 to a predetermined level.

The vertically downward protruding portion 28 of the upper plate 27 is fitted into the vertically upwardly oriented cylindrical recess 32 of the movable resistance plate 31 so as to be slidable in the vertical direction while ensuring a vertical movement range S.

The sliding member 33 on the lower surface of the movable resistance plate 31 is in contact with the upper surface of the fixed plate 35, and a distance G equal to the height of the sliding member 33 is maintained between the sliding member 33 and the fixed plate 35.

The outer diameter of the movable resistance plate 31 and the inner diameter of the surrounding wall 36 are such that the movable resistance plate 31 has a horizontal movement range within the surrounding wall 36.

Action When a horizontal force caused by an earthquake or the like causes a relative horizontal displacement between the foundation B and the structure C supported by the support 20 thereon, and the movable resistance plate 31 of the damping device 26 moves, The viscous shear resistance of the viscous fluid 37 acts. The magnitude of the viscous shear resistance force is proportional to the viscosity coefficient of the viscous fluid 37, the area of the two surfaces moving relative to each other, and their relative speed, and is
is inversely proportional to the size of This viscous shear resistance force acts as a resistance force (damping force) against horizontal displacement of the structure C to which the movable resistance plate 31 is attached, and seismic energy is absorbed. As a result, structure C
the relative horizontal displacement between and foundation B is reduced;
Excessive deformation of the laminated rubber body 25 of the support body 20 is prevented. The viscous shear resistance force of the viscous fluid 37 is constant regardless of the displacement amplitude and frequency as long as the velocity is the same. When a constant speed is applied to the movable resistance plate 31, the viscous shear resistance shows a steep rise in the form of a rectangular wave, reacts extremely sensitively to vibration, and has excellent responsiveness. Therefore, this damping device 26 exhibits seismic isolation and damping effects not only against large earthquakes but also against vibrations caused by wind loads, weak earthquakes, or the passage of large vehicles. This seismic isolation or damping effect becomes more pronounced as the viscous fluid 37 uses a viscous body with a higher viscosity.

Laminated rubber body 2 of support body 20 supporting structure C
5, if elastic deformation in the vertical direction, deformation due to temperature change, or creep deformation due to long-term vertical load occurs, the protrusion 28 of the upper plate 27 on the structure C side and the cylindrical recess of the movable resistance plate 31 32 slides in the vertical direction within the range of movement S, and the deformation is absorbed. On the other hand, the size of G between the lower surface of the movable resistance plate 31 and the upper surface of the fixed plate 35 is mechanically determined as the height dimension of the sliding member 33 provided on the lower surface of the movable resistance plate 31. 〓The magnitude of G is always constant. Therefore, the damping device 26 always generates a constant level of viscous shear resistance force damping performance, and exhibits stable seismic isolation and damping effects.

Embodiment Next, a preferred embodiment of the present invention shown in FIGS. 1 to 6 of the accompanying drawings will be described.

In the figure, C is a structure such as a building, and B is a foundation that supports the structure C.

Further, reference numeral 20 in the figure is a support that is interposed between the structure C and the foundation B and supports the structure C on the foundation B.

This support body 20 is composed of an upper support plate 21, a lower support plate 22, and a laminated rubber body 25 in which a plurality of rubber elastic plates 23 and metal plates 24 are alternately laminated in the vertical direction and bonded together. There is. In the illustrated example, the rubber elastic plate 23 and the metal plate 24 have a substantially square plate shape, but they are not limited to this and may be circular or the like.

The support body 20 has its upper support plate 21 connected to the structure C.
The lower support plate 22 is fixed to the upper surface of the foundation B and interposed between the structure C and the foundation B, and supports the structure C.

In the figure, 26 is a damping device installed between the structure C and the foundation B in the same arrangement as shown in FIG.
This is configured to resist and attenuate the relative horizontal displacement between the structure C and the foundation B by the viscous shear resistance force of the viscous fluid.

That is, 27 in the figure is an upper plate fixedly and integrally provided on the lower surface of the structure C. Specifically, it is fastened and fixed to an anchor 40 and its sleeve nut 41 that have been buried in the structure C in advance using bolts (not shown) (FIG. 3). On the lower surface of the upper plate 27, a cylindrical body (or a cylindrical body may be used) is integrally fixed vertically downward at the center thereof, and this is formed as a protrusion 28.

In the figure, numeral 29 denotes an annular frame integrally fixed to the outer periphery of the lower surface of the upper plate 27 so as to surround the protrusion 28. Reinforcing ribs 30 are provided in a radial arrangement between the inner surface of the annular frame 29 and the projection 28, thereby reinforcing the strength and rigidity of the projection 28 against horizontal force loads.

In the figure, 31 is a movable resistance plate. On the upper surface of the movable resistance plate 31, a cylindrical body into which the protrusion 28 is tightly fitted is integrally fixed vertically upward, and a hollow portion thereof is formed as a recess 32. A plurality of thin, small disk-shaped sliding members 33 are fixed to the lower surface of the movable resistance plate 31 in an arrangement as shown in FIG.

The sliding member 33 is interposed between the movable resistance plate 31 and the upper surface of the fixed plate 35 on which the movable resistance plate 31 is placed, and allows the movable resistance plate 31 to move smoothly horizontally. Lower surface and fixing plate 3
This serves as a spacer, a so-called spacer, that maintains a constant G between the upper surface of the plate and the upper surface of the plate.

As the material of the sliding material 33, a copper alloy, a multilayer material in which a layer of copper-based sintered alloy containing graphite is integrally adhered to a thin steel plate, or a synthetic resin can be used. This sliding material 33 is the movable resistance plate 31
It is integrally fixed to the lower surface by welding, gluing, or embedding with a portion protruding from the lower surface.

The movable resistance plate 31 and the upper plate 27 are in such a relationship that the protrusion 28 of the upper plate 27 is fitted into the recess 32 of the movable resistance plate 31 so as to be slidable in the vertical direction. Moreover, between the protruding portion 28 and the movable resistance plate 31, the laminated rubber body 25 of the support body 20 has a vertical movement range in which the height change caused by the vertical load of the structure C can be absorbed by sliding. S is secured.

In other words, when the laminated rubber body 25 of the support body 20 that supports the structure C is deformed by the vertical load of the structure C etc. and its height changes, the movement range S is The protruding part 28 of the upper plate 27 follows the change in the height of the rubber body 25 to move the movable resistance plate 31.
This is to absorb the change in height by sliding in the recess 32 within the movement range S, and to prevent the G between the lower surface of the movable resistance plate 31 and the upper surface of the fixed plate 35 from changing. .

In the figure, 34 indicates a movable resistance plate 31 and the movable resistance plate 31.
These reinforcing ribs are integrally provided radially between the outer surface of the cylindrical body and the outer surface of the cylindrical body that protrudes upward to form a recess 32 on the upper surface of the cylindrical body, thereby reinforcing the cylindrical body against horizontal force loads.

In the figure, 35 is a fixed plate integrally provided on the foundation B. Specifically, a bolt (not shown) is fastened to a sleeve nut 41 of an anchor 40 buried in the foundation B in advance (FIG. 3). A relatively short cylindrical surrounding wall 36 is integrally formed on the upper peripheral edge of the fixing plate 35 to form a container structure, in which a viscous fluid 37 is accommodated. The movable resistance plate 31 has its sliding member 33 in sliding contact with the upper surface of the fixed plate 35. In addition, the outer diameter of the movable resistance plate 31 is considerably smaller than the inner diameter of the surrounding wall 36 (Figs. 3 and 4), and the difference in diameter between the structure C and the foundation B caused by an earthquake, etc. This area is secured as a movement range of the movable resistance plate 31 during relative horizontal displacement between the two sides.

Viscous fluid 37 accommodated on the fixed plate 35
is accommodated in the surrounding wall 36 by an amount sufficient to at least immerse the lower surface of the movable resistance plate 31 disposed within the surrounding wall 36 of the fixed plate 35.

The types of viscous fluid 37 include ordinary viscous bodies,
For example, in addition to silicone oil, viscous polymers such as polyisobutylene, polypropylene, polybutene, or asphalt can be used as high viscosity materials particularly for improving damping characteristics.

In this damping device 26, a viscous shear resistance generating section is constituted by the gap G between the movable resistance plate 31 and the fixed plate 35 and the viscous fluid 37 interposed in the gap G.

In the figure, 38 indicates the annular frame 29 of the upper plate 27 and the fixed plate 3.
This is a cover that closes off the space between it and the surrounding wall 36 of No. 5.

Effects of the present invention As described above in detail in conjunction with the embodiments, according to the seismic isolation device for structures according to this invention, even if the laminated rubber body 25 serving as the support 20 has a height in the vertical direction. Even if a change occurs, this change in height is completely absorbed by vertically sliding the protrusion 28 of the upper plate 27 in the movement area S in the recess 32 of the movable resistance plate 31. There is no change in G between the lower surface of the fixed plate 35 and the upper surface of the fixed plate 35. At the same time, between the movable resistance plate 31 and the fixed plate 35 〓G is a sliding member 3 that is fixed and protrudes from the lower surface of the movable resistance plate 31.
Since the height dimension is determined as 3, G is always secured for a certain amount of time, so there is no change in viscous shear resistance, and constant seismic isolation or control is achieved during a long service life. You can expect a seismic effect.

Therefore, seismic energy can be well attenuated, and the response acceleration of structure C to external input can be significantly reduced.In addition, the amplitude has been reduced and vibration damping properties have been improved, so structure C and This allows the relative displacement with the foundation B to be reduced.

[Brief explanation of the drawing]

Figure 1 shows a seismic isolation support device according to this invention, and is a sectional view taken along line II in Figure 2, and Figure 2 is a -
FIG. Fig. 3 is an enlarged sectional view of the damping device, Fig. 4 is a - sectional view of Fig. 3, Fig. 5 is a sectional view taken along the line - - of Fig. 3, Fig. 6 is a bottom view of the movable resistance plate, and Fig. The figure is a sectional view showing a conventional seismic isolation support device, and FIG. 8 is a sectional view showing a different conventional seismic isolation support device.

Claims (1)

[Claims for Utility Model Registration] Structure C is constructed by interposing between structure C and foundation B a support body 20 consisting of a laminated rubber body 25 in which rubber elastic plates 23 and metal plates 24 are alternately laminated and bonded. is supported on the foundation B, and the relative horizontal displacement occurring between the structure C and the foundation B is reduced by the viscous shear resistance force of the viscous fluid 37.
In a seismic isolation support device for a structure, the damping device 26 includes an upper plate 27 that is integrally provided on the lower surface of the structure C and has a vertical downward protrusion 28 on the lower surface, and a top plate 27 that is provided with the protrusion 28 on the upper surface. A movable resistance plate 31 has a vertically upward cylindrical recess 32 into which a member 28 is slidably fitted, and a sliding member 33 of a predetermined height is provided on the lower surface to be slidably abutted on a fixed plate to be described later. , consisting of a fixed plate 35 which is fixed to the foundation B and has a cylindrical surrounding wall 36 on the upper surface for storing a viscous fluid, and a viscous fluid 37 filled in the surrounding wall 36 to a predetermined level, and the upper plate The vertically downward protrusion 28 of No. 27 is fitted in the vertically upwardly directed cylindrical recess 32 of the movable resistance plate 31 so as to be slidable in the vertical direction while ensuring a vertical movement range S; The sliding material 33 on the lower surface of the resistance plate 31 is in contact with the upper surface of the fixed plate 35, and a distance G equal to the height of the sliding material 33 is secured between the sliding material 33 and the fixed plate 35; A seismic isolation support device for a structure, wherein the outer diameter and the inner diameter of the surrounding wall 36 have a size relationship that ensures a horizontal movement range of the movable resistance plate 31 within the surrounding wall 36. .