JPH11324398A - Laminated plate isolator having damping function, and base isolation structure bed using the isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten oscillation of a structure by using one kind of a base isolation member, prevent deformation and collapse of a structure even when it is subjected to a strong wind and a large earthquake, and easily construct a base isolation structure of every kind of structures. SOLUTION: This lamination plate isolator 1 having a damping function is so constructed that plural hard plates 5 and soft plates 6 are alternately stacked to form a column-like composite laminated body 4 between an upper plate 2 and a lower plate 3, a column-like hollow part 7 piercing the composite laminated body 4 is formed in the interior of the composite laminated body 4, a die 9 having a fit-in hole 9b and a fitting rod 10, the tip of which is movably fitted in the fit-in hole 9b are disposed in the hollow part 7, and spherical bearing parts 9c, 10b provided on the base ends of the die 9 and the fit-in rod 10 are respectively rotatably supported on the spherical bearing seats 11, 13 provided on the upper plate 2 and the lower plate 3. The base isolation structure bed is so constructed that a frame 21 having slab-rigidity is supported by the laminated plate isolator 1 installed on the foundation and every kind of structures are constructed on the frame 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated plate isolator having a damping function capable of constructing a structure, especially a middle and low-rise structure into a seismic isolation structure by a relatively simple method, and an isolator using the same. It is about the gantry.

[0002]

2. Description of the Related Art There is a demand for the development of a technique for constructing a middle-low-rise structure into a base-isolated structure by a relatively simple method. As a conventional known technique, there is seismic isolation ground disclosed in Japanese Patent Application Laid-Open No. 10-37212. This is seismic isolation ground for supporting lightly-loaded structures such as detached houses, condominiums and apartments.
It is composed of a foundation such as a pile, a seismic isolation structure, and a housing support floor made of H-section steel. The seismic isolation structure is provided with a columnar hollow portion inside a composite laminate formed by alternately laminating hard plates having high rigidity and soft plates having viscoelastic properties. In order to improve the seismic isolation characteristics of the vehicle, lead, friction plates or hard granules are provided.

[0003] However, in the case of such seismic isolation ground, although there are some means for arranging lead or a friction plate in the hollow portion of the composite laminate to attenuate the sway transmitted to the building, large seismic force and strong cross wind are generated. No consideration has been given to the shaking or pulling force when receiving the building, and the shape of the building built on top of the housing support floor is higher than the width, which may cause a large earthquake or When a strong crosswind such as a typhoon is received, there is no disclosure of a technology that attenuates the sway transmitted to the building by a seismic isolation member, a foundation, and the like, and that also has a high pull-out function. Further, Japanese Patent Application Laid-Open No. 10-37212 discloses that the arrangement of seismic isolation members and the like is such that the center of gravity of the structure and the rigidity of the frame are matched when the structure is viewed two-dimensionally so as not to cause torsional vibration in the building. There is no disclosure of the devised technology, and there is no suggestion thereof. Therefore, when a strong earthquake or a strong crosswind such as a typhoon is applied to the middle and low-rise structure, there is a concern that the structure may be deformed or collapsed.

The present invention has been made to solve the above problems, and an object of the present invention is to directly transmit a seismic force or a roll in a strong wind to a structure using one type of seismic isolation member. Without
It attenuates the shaking and also has a high pull-out prevention function.It does not cause the building to shake at a moderate wind level, preventing the structure from being deformed or collapsed even in the event of a large earthquake or strong wind. It is an object of the present invention to provide a laminated plate isolator having a damping function capable of easily constructing various types of seismic isolation structures, and a seismic isolation gantry using the same.

[0005]

According to a first aspect of the present invention, there is provided a laminated isolator having a damping function, comprising a hard plate having high rigidity and a soft plate having elastic properties between an upper plate and a lower plate. A plurality of sheets are alternately stacked to form a columnar composite laminate, and inside the composite laminate, a columnar hollow portion penetrating the composite laminate is formed. Within the hollow portion, a die having a fitting hole and the die A fitting rod whose tip is movably fitted in the fitting hole is disposed, and the spherical bearings provided at the base ends of the die and the fitting rod are rotated by spherical bearings provided on the upper plate and the lower plate, respectively. It is characterized by being freely supported.

A seismic isolation gantry according to a second aspect of the present invention is provided in the upper or lower surface or on the lower surface of a rigid frame.
The laminated plate isolator having the damping function described in the above is arranged and mounted at a position that effectively acts on the load at the time of the earthquake when viewed in a plan view, and the laminated plate isolator is fixed on a foundation, and various types are mounted on the frame. It is characterized by being able to construct structures (wood structures, steel structures, reinforced concrete structures, etc.).

In the above configuration, when the structure receives a strong wind or a large earthquake, the composite laminate is deformed, and the insertion rod is pulled out from the insertion hole of the die, or the insertion rod is inserted into the insertion hole. Energy is absorbed by the frictional resistance at the time. Therefore, since the structure is constructed on a frame supported by one type of seismic isolation member, various structures such as a wooden structure, a steel frame structure, and a reinforced concrete structure can be easily constructed. Installation costs and construction costs are reduced. In addition, the laminated plate isolator with damping function can cope with strong winds and large earthquakes, and since the center of gravity of the structure and the rigid center of the seismic isolation gantry can be matched in a plan view, mechanically Clear design is possible, and the fear of deformation and collapse of structures and the fear of earthquakes can be solved at once.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 and 2 are a cross-sectional view and a load-displacement curve showing an example of a laminated plate isolator having a damping function of the present invention. FIGS. 3 to 5 show cross-sectional front views when the seismic isolation gantry of the present invention is applied to various buildings. FIG. 6 shows an example of arrangement of seismic isolation members in the seismic isolation gantry of the present invention.

In FIG. 1, a laminated plate isolator 1 having a damping function according to the present invention comprises a hard plate (steel plate) 5 having high rigidity between an upper plate 2 and a lower plate 3 and a soft plate (elastic property). And a columnar hollow portion 7 vertically penetrating through the center of the composite laminate 4.
The friction damper 8 includes a die 9 and a fitting rod 10 disposed therein.

The die 9 includes a main body shaft portion 9a having a fitting hole 9b formed therein and a spherical bearing portion 9c integrally provided at a lower end of the main body shaft portion 9a. It is rotatably housed and supported by a spherical seat 11 provided on the lower plate 3, and is capable of following the shear deformation of the composite laminate 4 in all directions.

The lower plate 3 is composed of two plates 3a and 3b,
An inverted truncated cone-shaped counterbore portion and an upper hemisphere portion are formed in the center of the upper plate 3a, and a receiving member 12 having a lower hemisphere portion formed on the upper portion is attached to the lower surface of the center portion of the plate 3a with bolts, The part and the lower hemisphere form a spherical seat 11.

The fitting rod 10 has a tip 9 in which the fitting hole 9 of the die 9 is inserted.
b, and a spherical bearing 10b integrally provided at the upper end of the rod 10a. The spherical bearing 10b is provided on the upper plate 2 and has a spherical bearing 10b. The composite laminate 4 is rotatably housed and supported by the seat 13, and is capable of following the shear deformation of the composite laminate 4 in all directions. The upper plate 2 also includes two plates 2a and 2b, and the upper plate 2a and the receiving member 14 form a spherical seat 13 similarly to the lower plate 3.

In the laminated plate isolator 1 having the above-described structure, the lower plate 3 is fixed to the foundation pillar portion 22a of the concrete foundation 22 with bolts, and the upper plate 2 is attached to the lower surface of the building or a frame of a seismic isolation gantry described later. 21 is fixed to the lower surface via bolts. In normal times, the composite laminate 4 supports the weight of the building, and when subjected to strong winds or large earthquakes, the composite laminate 4 undergoes shear deformation, and in the event of an earthquake, does not transmit excessive horizontal seismic force to the upper building. . At the same time as the shear deformation of the composite laminate 4, the insertion rod 10 is pulled out or inserted into the die 9, and seismic energy or the like is absorbed by the frictional force generated during this movement. The graph shown in FIG. 2 shows one example of a load-displacement curve (history characteristic) of the friction damper 8 by the die 9 and the fitting rod 10, and a good energy absorbing ability (load × displacement) can be obtained. You can see that.

Next, a seismic isolation gantry 20 is constructed using the laminated isolator 1 having such a damping function. That is, as shown in FIGS. 3 to 5, the laminated plate isolators 1 are arranged and mounted at predetermined positions on the lower surface of a frame 21 made of shaped steel, concrete, or the like and having plate rigidity against vertical force and horizontal force. The laminated plate isolator 1 is fixed on a concrete foundation 22 to form a seismic isolation gantry 20. On this seismic isolation gantry 20, a wooden building A, a steel frame building B, a reinforced concrete building C, and the like are constructed. I do.

The concrete foundation 22 includes a foundation pillar 22a.
The laminated plate isolator 1 is installed and fixed on the foundation pillar portion 22a, and the frame 21 is supported by the laminated plate isolator 1.

The frame 21 is constructed of H-shaped steel or the like in the wooden building A and the steel building B. In the reinforced concrete building C, the frame 21 is formed of an H-shaped steel frame or a foundation beam on the frame. It is made of steel-framed reinforced concrete into which reinforced concrete is cast. The laminated plate isolator 1 is disposed on such a frame 21, but since the frame 2 is interposed between the building and the seismic isolation member, the laminated plate isolator 1 is not restricted by the pillar position of the building. Or the building can be freely constructed on the frame 21 without arranging the laminate isolator 1 for each pillar of the building.

FIG. 6 (b) shows an example of a seismic isolation gantry using a general laminated rubber isolator G and a damper D. The building has a shape as shown in FIG. 6 (a). When,
In the frame configuration and seismic isolation bearing / damper arrangement shown in Fig. 6 (b), the center of gravity of the building does not match the rigidity of the seismic isolation gantry.
There is a risk of torsional vibration. Therefore, as shown in FIG. 6C, it is preferable that the structure of the frame 21 and the arrangement of the laminated plate isolator 1 match the center of gravity of the building with the rigidity of the seismic isolation gantry 20. That is, when viewed from a plane, the orthogonal members 21a and the oblique members 21b are provided around the center of gravity, and the laminated plate isolator 1 is provided at positions equidistant from the center of gravity on two orthogonal axes and a diagonal line passing through the center of gravity. To match the center of gravity with the rigidity.

The seismic isolation gantry 20 has a frame 21 made of shaped steel, concrete, or the like and having plate rigidity against vertical force and horizontal force. The base on which the seismic isolation member is mounted can be installed at an arbitrary position on the frame 21 or at a wide interval since the base is mounted at a position where it works effectively (see FIG. 7). For that purpose, it is necessary to increase the rigidity with respect to the vertical force as compared with the related art. Therefore, the frame 21 having sufficient plate rigidity not only against horizontal force but also against vertical force is used.

Further, in order for the various structures constructed on the frame 21 and the frame 21 to function sufficiently as an integral unit, for example, as shown in FIG.
It is also conceivable to provide in advance a bracket (box column, H-beam, etc.) 30 to which the column is attached.

In the seismic isolation gantry 20 having the above-described structure, the laminated plate isolator 1 having the damping function is installed on the foundation column portion 22a of the foundation 22, and the laminated plate isolator 1 supports the frame 21. A wooden building A, a steel building B, a reinforced concrete building C, and the like are constructed on 21.

In normal times, the laminate isolator 1 supports the weight of the building via the frame 21, and the composite laminate 4 of the laminate isolator 1 is deformed during an earthquake or strong wind, and an excessive horizontal seismic force is applied to the upper building. Do not tell At the same time, the seismic energy is absorbed by the frictional force of the friction damper 8 of the laminated plate isolator 1. Also, by matching the center of gravity of the building with the rigidity of the seismic isolation gantry 20, a mechanically clear design that does not cause torsional vibration can be made. As described above, the deformation and collapse of the building are reliably prevented.

Since only one kind of the laminated isolator 1 having the damping function is required for the seismic isolation member, the number of members is reduced, the construction is easy, and the installation cost and the construction cost of the apparatus are reduced. In addition, since the building is constructed on the frame 21, the laminated plate isolator 1 is arranged without being restricted by the pillar positions of the building, and a desired building mainly composed of various structures can be freely constructed.

In the above-described example, the case where the laminated plate isolator having the damping function is attached to the lower surface of the frame has been described. However, the present invention is not limited to this, and may be incorporated in the upper and lower surfaces of the frame.

[0024]

According to the laminated isolator having a damping function and the seismic isolation gantry of the present invention having the above-described structure, the following effects can be obtained. (1) Since only one kind of the laminated isolator 1 having the damping function is required for the seismic isolation member, the number of members is reduced, the construction is easy, and the installation cost and the construction cost of the device are reduced. (2) Since structures are constructed on a frame supported by one type of seismic isolation member, various structures such as wooden structures, steel frames, reinforced concrete structures, etc. can be easily constructed, shortening the construction period and construction. Cost can be reduced. (3) A laminated isolator with a damping function can cope with strong winds and large earthquakes, and can match the center of gravity and the rigid center of the structure when viewed two-dimensionally, so that there is no torsional vibration This makes it possible to achieve a clear design and solve the fear of deformation or collapse of a structure or the fear of an earthquake at once. (4) Since the frame has plate rigidity against both vertical and horizontal forces, the seismic isolation member can be installed at any position and can be installed at wide intervals. (5) Medium winds will not cause the building to twist.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a laminated plate isolator having a damping function of the present invention, wherein (a) shows a state before deformation and (b) shows a state after deformation.

FIG. 2 is a graph showing a load-displacement curve of a friction damper incorporated in a laminated plate isolator having a damping function of the present invention.

FIG. 3 is a partial sectional front view showing an example in which a wooden building is constructed on the seismic isolation gantry of the present invention.

FIG. 4 is a partial sectional front view showing an example in which a steel-frame building is constructed on the seismic isolation gantry of the present invention.

FIG. 5 is a partial sectional front view showing an example in which a reinforced concrete building is constructed on the seismic isolation gantry of the present invention.

FIG. 6 shows a building on the seismic isolation gantry of the present invention, (a) is a front view of the building, (b) is a plan view of the seismic isolation gantry having different positions of the center of gravity and the rigidity, and (c) is the center of gravity of the building. It is a top view of the seismic isolation gantry whose rigidity was matched.

FIG. 7 is a front view showing an example in which foundations can be installed at wide intervals in the seismic isolation gantry of the present invention.

FIG. 8 is a front view showing an example in which a bracket is projected on a frame in the seismic isolation gantry of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Laminated plate isolator which has a damping function 2 ... Upper plate 3 ... Lower plate 4 ... Composite laminated body 5 ... Hard plate (steel plate) 6 ... Soft plate (organic substances such as natural rubber and synthetic rubber) 7 hollow part 8 friction damper 9 die 9a body shaft part 9b fitting hole 9c spherical bearing part 10 fitting rod 10a rod part 10b spherical bearing part 11 spherical bearing part 12 ... Seat member 13 ... Spherical seat 14 ... Seat member 20 ... Seismic isolation gantry 21 ... Frame 22 ... Concrete foundation 22a ... Foundation column part 22b ... Foundation beam part 30 ... Bracket

Continued on the front page (72) Inventor Toshiaki Hashi 3-4-5 Toyosu, Koto-ku, Tokyo Inside Tomoe Giken Co., Ltd. (72) Inventor Takashi Shimanuki 3-4-5 Toyosu Toyosu, Koto-ku Tokyo Giken

Claims (2)

[Claims] 1. A columnar composite laminate is formed by alternately laminating a plurality of hard plates having high rigidity and soft plates having elastic properties between an upper plate and a lower plate. Inside, a column-shaped hollow portion that penetrates the composite laminate is formed, and in this hollow portion, a die having a fitting hole and a fitting rod whose tip is movably fitted to the fitting hole are disposed, A laminated plate isolator having a damping function, wherein a spherical bearing portion provided at a base end of a die and a fitting rod is rotatably supported by spherical bearings provided at said upper plate and lower plate, respectively. 2. The laminated isolator having a damping function according to claim 1 is disposed on the upper or lower surface of the frame having rigidity of the plate or at a position where the laminated plate isolator having a damping function according to claim 1 effectively acts on a load during an earthquake. A seismic isolation gantry characterized in that the laminated plate isolator is fixed on a foundation and various structures can be constructed on the frame.