JP5120633B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device that is interposed between an upper structure and a lower structure such as a bridge or a building and absorbs and attenuates seismic energy that has acted during an earthquake to suppress shaking of the upper structure.

  Conventionally, for example, in bridges and high-rise buildings, seismic isolation devices (base isolation bearings) are installed between the upper structure and the lower structure, such as between the main girder or main structure and the abutment or pier, or between the building and the foundation. In the event of an earthquake, the natural period of the superstructure is shifted, for example, from the dominant period band of seismic motion (earthquake energy) to the long period side, and the response acceleration is reduced to suppress shaking.

  In this type of seismic isolation device, there is one in which a rubber material (elastic body) such as high damping rubber and a steel plate (stiffening body) are alternately stacked in the vertical direction. In this seismic isolation device, the upper structure can be supported because the spring is made high with respect to the vertical load by the rubber material and the steel plate. In addition, since the spring is reduced so that the rubber material deforms in the horizontal direction against the horizontal load, a large external force (earthquake energy) acts in the horizontal direction during an earthquake and the rubber material deforms in the horizontal direction. Seismic energy is absorbed by deformation of the material.

On the other hand, this type of seismic isolation device includes a rubber material in which a woven fabric or a non-woven fabric (fiber material) is laminated and embedded so as to alternate with the rubber material (for example, Patent Document 1, Patent). Reference 2). In this seismic isolation device, when a vertical load of a certain value or more is applied, the fiber material breaks to exhibit an energy absorption effect and suppress the generation of impact load in the vertical direction (vertical direction, stacking direction). Can do. In addition, when a horizontal load of a certain value or more acts, the energy absorbing effect is exhibited by peeling the interface between the fiber material and the rubber material.
JP-A-10-140524 JP 2001-49619 A

  However, in the seismic isolation device constructed by alternately laminating the above-mentioned conventional rubber materials and steel plates, the seismic energy (horizontal load) applied during the earthquake is absorbed only by the horizontal deformation of the rubber material and exhibits a damping effect. In addition, since the damping effect is exhibited only when a deformation exceeding a certain value occurs, the amount of horizontal deformation of the seismic isolation device (rubber material) is large, and the amount of horizontal displacement of the superstructure is large. That is, this type of seismic isolation device is, for example, approximately 150% of the thickness of rubber material at the time of level 1 ground motion (earth motion with a probability of occurring once or twice during the service period of the structure), level 2 ground motion ( A horizontal displacement of about 250% of the thickness of the rubber material occurs during an earthquake of extremely rare but very strong earthquake motion. For this reason, when this seismic isolation device is installed between the main girder (main structure) of the bridge and the abutment, for example, the main girder is greatly horizontal along with the displacement of the seismic isolation device (deformation of rubber) during an earthquake. Therefore, it is necessary to set a large gap between the end of the main girder and the abutment. Along with this, there is a problem that a joint structure such as a large finger joint is required and the cost of the joint structure is increased.

  On the other hand, in the seismic isolation device constructed by laying and embedding fiber material in the conventional rubber material, the interface between the fiber material and the rubber material exfoliates the seismic energy (horizontal load) of a certain value or more that acted during the earthquake. Therefore, the amount of horizontal deformation of the rubber material and thus the amount of horizontal displacement of the superstructure can be controlled. However, when the seismic energy is attenuated by such a separation of the fiber material and the rubber material, the effect as great as the attenuation effect due to the breakage of the fiber material cannot be expected. For example, for level 1 earthquake motion or level 2 earthquake motion, Again, the amount of horizontal deformation of the rubber material and thus the amount of horizontal displacement of the superstructure cannot be controlled sufficiently.

  The present invention provides a seismic isolation device that can control the amount of horizontal deformation in accordance with the magnitude of seismic energy, and that can exhibit excellent seismic energy attenuation effects and reliably suppress shaking of the superstructure. The purpose is to provide.

  In order to achieve the above object, the present invention provides the following means.

The seismic isolation device of the present invention is an seismic isolation device interposed between an upper structure and a lower structure, for absorbing and attenuating seismic energy that has acted during an earthquake and suppressing shaking of the upper structure. It formed integrally provided on a fibrous body made of fibers in the laminated portion of alternately laminated stiffener and a plurality provided in a state in which the fiber body is arranged fiber direction of the plurality of fibers in the stacking direction of the stacked portion The individual fiber bodies are formed using the same type of fibers having the same breaking elongation, and the fiber bodies are formed using fibers having different breaking elongations .

  In the present invention, since the laminated portion is formed by alternately laminating elastic bodies such as high damping rubber and stiffening bodies such as steel plates, the vertical load acting from the superstructure is mainly influenced by the rigidity of the stiffening body. Can be supported. In addition, since the fiber body is provided with the fiber direction of the fiber arranged in the lamination direction (vertical direction), seismic energy acts to deform the lamination part (elastic body) in the horizontal direction, and the fiber of the fiber body As a result, a tensile force is generated and horizontal deformation of the laminated portion is suppressed. When large seismic energy acts and the horizontal deformation amount of the laminated portion becomes a certain value or more, the fibers of the fiber body are stretched and broken, and the seismic energy can be absorbed by the breaking energy of the fibers. For this reason, it is possible to control the horizontal deformation amount of the laminated portion (elastic body) by appropriately forming the fiber body using fibers that break at a desired elongation amount, and the horizontal deformation amount is large. Accordingly, it is possible to obtain an attenuation effect of seismic energy by breaking the fiber of the fiber body (according to the magnitude of the seismic energy). This makes it possible to control the amount of horizontal displacement of the seismic isolation device (the amount of horizontal deformation of the laminated part), and to absorb and attenuate seismic energy by breaking the elastic body in addition to the deformation of the elastic body. Thus, it is possible to exert an excellent seismic energy attenuation effect.

In addition , when the laminated portion is deformed in the horizontal direction due to the action of seismic energy, the fiber body using fibers having a large elongation at break from the fiber body formed using fibers having a small elongation at break according to the amount of horizontal deformation. The fibers of each fiber body can be broken. As a result, for example, individual fibers using the same type of fibers having the same elongation at break (elongation at break (elongation rate)), such as fibers that break during a level 1 ground motion or fibers that break during a level 2 ground motion earthquake. An excellent earthquake while controlling the horizontal displacement of the seismic isolation device for a wide range of seismic energy by providing multiple types of fiber bodies, each formed using fibers with different elongation at break, in the laminated part It is possible to exert an energy attenuation effect.

  Furthermore, in the seismic isolation device of the present invention, the fibrous body may be formed by combining a plurality of types of fibers having different breaking elongations.

  In this invention, by forming a fibrous body by combining a plurality of types of fibers having different elongation at break, when the laminated portion is deformed in the horizontal direction due to the action of seismic energy, the fibrous body is deformed according to the horizontal deformation amount. It is possible to break the fibers having the smaller breaking elongation and the fibers having the larger breaking elongation. As a result, the horizontal displacement of the seismic isolation device can be applied to a wide range of seismic energy by, for example, forming a fiber body by combining a fiber that breaks during a level 1 ground motion and a fiber that breaks during a level 2 ground motion. It is possible to exert an excellent seismic energy attenuation effect while controlling the amount.

  Moreover, in the seismic isolation apparatus of this invention, the said fiber body formed using the fiber from which breaking elongation differs, respectively may be arranged in parallel in the horizontal direction which goes to the inside from the outer side of the said lamination | stacking part.

  In this invention, for example, when a fiber body using a fiber having a small breaking elongation and a fiber body using a fiber having a large breaking elongation are juxtaposed in the horizontal direction from the outside to the inside of the laminated portion, the seismic energy Acts to deform the laminated portion in the horizontal direction, and depending on the amount of horizontal deformation, the fiber can be broken in the order of the fiber body using a fiber having a small breaking elongation to the fiber body using a fiber having a large breaking elongation. It becomes possible. As a result, a seismic isolation system for a wide range of seismic energy, such as arranging a fiber body that uses fibers that break during Level 1 ground motions and a fiber body that uses fibers that break during Level 2 ground motions. It is possible to exhibit an excellent seismic energy attenuation effect while controlling the horizontal displacement of the device.

  Furthermore, in the seismic isolation device of this invention, the said laminated part may be formed in the column shape, and the said fiber body may be juxtaposed in the circumferential direction of the said laminated part.

  In the present invention, the laminated portion is formed in a columnar shape, and a plurality of fibrous bodies formed, for example, using the same type of fibers having the same breaking elongation are provided by arranging the fibrous bodies in the circumferential direction of the laminated portion. Even in this case, seismic energy acts to deform the laminated portion in the horizontal direction, and the tensile force acting on the fibers of each fibrous body can be changed according to the deformation direction (the direction of the seismic energy action). Thereby, in addition to the magnitude of the horizontal deformation amount of the laminated part, and in turn, the magnitude of the seismic energy, the fibers of the fiber bodies arranged side by side in the circumferential direction of the laminated part are sequentially broken according to the deformation direction of the laminated part. As a result, it is possible to exhibit an excellent seismic energy attenuation effect while controlling the amount of horizontal displacement of the seismic isolation device.

  Furthermore, in the seismic isolation device of the present invention, the fibrous body is formed as an endless fiber bundle in which fibers are bundled, and a pair of fractured portions in which the fiber directions are parallel to each other are arranged in the stacking direction. Thus, it is desirable that a pair of arc-shaped fixing portions connected to the pair of fracture portions is provided by being embedded in the elastic body of the laminated portion.

  In the present invention, with the pair of fractured portions arranged in the stacking direction, the arc-shaped fixing portion is embedded in the elastic body and the fiber bundle (fiber body) is installed, for example, acting from the upper structure. The elastic body is compressed by the vertical load and pressed by the elastic body, so that the fixing unit can be easily and firmly fixed to the laminated unit. As a result, when the seismic energy acts to deform the laminated part in the horizontal direction and a tensile force is generated at the broken part of the fiber bundle, the fixing part is not pulled out from the laminated part (fixing of the fiber body). Therefore, it is possible to reliably stretch and break the fiber at the broken portion according to the amount of horizontal deformation. Therefore, it is possible to reliably exhibit an excellent seismic energy attenuation effect while controlling the horizontal displacement of the seismic isolation device.

  According to the seismic isolation device of the present invention, by providing a fiber body in a state in which the fiber direction of the fiber is arranged in the lamination direction in the lamination part in which the elastic body and the stiffening body are alternately laminated, the lamination part ( The amount of horizontal deformation of the elastic body and the seismic isolation device can be controlled, and the seismic energy can be attenuated by breaking the fiber body in addition to the deformation of the elastic body. As a result, the amount of horizontal deformation can be controlled in accordance with the magnitude of the seismic energy, and an excellent seismic energy attenuation effect can be exhibited to reliably suppress the shaking of the superstructure.

  Thus, it becomes possible to suppress the shaking of the superstructure by exhibiting an excellent damping effect, for example, when it is interposed between the main girder (main structure) of the bridge and the abutment, Unlike the seismic isolation device, it is not necessary to set a large gap between the end portion of the main girder and the abutment, and the cost of a joint structure such as a finger joint can be reduced.

  Hereinafter, with reference to FIG.1 and FIG.2, the seismic isolation apparatus which concerns on one Embodiment of this invention is demonstrated. This embodiment is interposed between the superstructure and the substructure, for example, between the main girder or main structure of the bridge and the abutment or pier, between the building and the foundation, and absorbs and attenuates the seismic energy that acts during the earthquake. This is related to a seismic isolation device that suppresses shaking of the superstructure.

  As shown in FIGS. 1 and 2, the seismic isolation device A of the present embodiment is formed in a rectangular parallelepiped shape. The elastic body 1 of high damping rubber and the stiffening body 2 of a steel plate are vertically moved (lamination direction T1). Are formed by integrally providing fiber bodies 4 made of fibers in the laminated portions 3 laminated alternately. Further, the fiber bodies 4 are respectively installed on the four side surfaces of the rectangular parallelepiped laminated portion 3, and each fibrous body 4 is in a state in which the fiber direction M of the fiber is arranged in the lamination direction T1 of the laminated portion 3, that is, The fibers are installed such that the fiber direction M is along the side surface of the laminated portion 3. Furthermore, the fiber bodies 4 respectively installed on the side surfaces of the parallel laminated portions 3 are arranged to face each other. In the seismic isolation device A of the present embodiment, for example, a rubber protective cover 5 is provided so as to cover the side surface of the laminated portion 3 and the fiber body 4.

The fibrous body 4 is formed as an endless fiber bundle in which a plurality of fibers such as polyamide fiber, vinylon fiber, and glass fiber are bundled. Specifically, the fibrous body 4 of the present embodiment has, for example, breaking elongation (elongation at break (elongation rate)) of 20%, 25%, 40%, and tensile strength of 588 N / cm, 882 N / cm, 1764 N / cm, Young's modulus is 1.08 × 10 ³ N / mm ² , 3.14 × 10 ² N / mm ² , 5.8 × 10 ² N / mm ² , Poisson's ratio is 0.38, 0.40, 0 .35, a combination of a plurality of types of fibers having different physical properties (elongation at break).

  Further, the fibrous body 4 of the present embodiment formed as an endless fiber bundle includes a pair of fractured portions 4a in which the fiber directions M are parallel to each other, and a pair of arc-shaped fixing portions 4b connected to the pair of fractured portions 4a. 4c, and one fixing unit 4b side and the other fixing unit 4c side are bent at right angles to form a U-shape in side view. Then, the one fixing unit 4b side and the other fixing unit 4c side are respectively embedded in the outermost elastic body 1 (1a, 1b) in the stacking direction M of the stacking unit 3, and a part of the fractured portion 4a. Are arranged in a stacking direction T1 along the side surface of the stacking unit 3.

  Further, at this time, each elastic body 1 of the laminated portion 3 is formed by integrally laminating a plurality of thin plate-like high-attenuation rubbers, and the one fixing portion 4b side and the other fixing portion 4c of the fiber body 4 are formed. The side is embedded by being sandwiched between thin plate-like high-damping rubbers of the outermost elastic body 1 (1a, 1b). The elastic body 1 is compressed by the vertical load applied from the upper structure G1, for example, on the fixing portions 4a and 4b side, and is pressed and sandwiched between the upper and lower high-attenuation rubbers and firmly fixed. Thereby, the fibrous body 4 is installed by fixing the upper and lower sides to the laminated portion 3 in a state where a part of the broken portion 4a is arranged in the lamination direction T1.

  Next, the operation and effect of the seismic isolation device A of the present embodiment having the above-described configuration will be described.

  The seismic isolation device A of the present embodiment has the stacking direction T1 in the vertical direction, the upper stiffener 2 (upper steel plate 2a) above the stacking direction T1 as the upper structure G1, and the lower stiffener 2 (lower steel plate 2b) in the stacking direction T1. ) In contact with the lower structure G2, and is interposed between the upper structure G1 and the lower structure G2. And this seismic isolation apparatus A is made high-spring with respect to a vertical load, and can support the superstructure G1 by the elastic body 1 and the stiffening body 2 (mainly by the rigidity of the stiffening body 2).

  On the other hand, when a large-scale earthquake occurs, the spring 3 is lowered so that the elastic body 1 is deformed in the horizontal direction T2 with respect to a horizontal load, so that the laminated portion 3 (elastic body 1) is in the horizontal direction T2. Deforms and absorbs seismic energy. At this time, the fibrous body 4 is provided integrally with the laminated portion 3, and the broken portion 4 a of the fibrous body 4 is provided with the fiber direction M arranged in the laminated direction T 1 of the laminated portion 3. Energy acts and the laminated part 3 is deformed in the horizontal direction T2, and a tensile force is generated in the plurality of fibers of the fractured part 4a of the fibrous body 4 to suppress horizontal deformation of the laminated part 3.

  In the present embodiment, since the fiber body 4 is formed by combining a plurality of types of fibers having different elongation at break, for example, at the time of an earthquake of level 1 earthquake motion, 20% elongation occurs in the plurality of fibers of the fracture portion 4a. When the laminated portion 3 is deformed in the horizontal direction T2 so as to occur (when the amount of horizontal deformation of the laminated portion 3 exceeds a certain value), a fiber having a breaking elongation of 20% breaks, and the seismic energy is absorbed by the breaking energy of the fiber. Is done.

  Further, for example, when the laminated portion 3 is greatly deformed in the horizontal direction T2 while absorbing seismic energy during an earthquake of level 2 ground motion, as the horizontal deformation amount of the laminated portion 3 increases, the plurality of fibers of the fractured portion 4a A fiber having a breaking elongation of 20%, a fiber of 25%, and a fiber of 40% breaks in this order, and fibers having different breaking elongations break in stages. In this way, the seismic energy is sequentially absorbed by the stepwise breakage of the fibers having different break elongations according to the horizontal deformation amount of the laminated portion 3. In addition, each fiber acts to suppress horizontal deformation of the stacked portion 3 while it is stretched according to the deformation in the horizontal direction T2 of the stacked portion 3 (until it breaks).

  That is, as in the present embodiment, in a state in which the fiber direction M of the fiber is arranged in the stacking direction T1 in the stacked portion 3 in which the elastic body 1 of the high damping rubber and the stiffener 2 of the steel plate are alternately stacked, the desired direction By integrally providing the fiber body 4 made of fibers that are broken by the amount of elongation, the seismic energy is absorbed while controlling the horizontal displacement of the seismic isolation device A. Furthermore, the seismic energy is also absorbed when the plurality of fibers of the fibrous body 4 breaks in stages according to the magnitude of the seismic energy (according to the magnitude of the horizontal deformation amount). Thereby, with respect to a wide range of seismic energy, an excellent damping effect of seismic energy is exhibited while controlling the horizontal displacement amount of the seismic isolation device A.

  Further, at this time, the fiber body 4 is formed as an endless fiber bundle by bundling the fibers, and the arc-shaped fixing portions 4b and 4c are embedded in the elastic body 1 (1a and 1b), and the breaking portion 4a It is firmly fixed in a state where a part is arranged in the stacking direction T1. Thereby, the tensile force according to the horizontal deformation amount of the lamination | stacking part 3 generate | occur | produces reliably in the fracture | rupture part 4a, the some fiber of the fracture | rupture part 4a is extended by the elongation amount according to the horizontal deformation amount, and a horizontal deformation amount is constant value. As a result, the fibers of the fractured portion 4a are surely broken and the seismic energy is absorbed.

  Therefore, in the seismic isolation device A of the present embodiment, the laminated portion 3 is formed by alternately laminating the elastic body 1 of high-damping rubber and the stiffening body 2 of the steel plate, so that the rigidity of the stiffening body 2 is mainly used. Thus, it becomes possible to support the vertical load acting from the upper structure G1. Further, since the fiber body 4 is provided with the fiber direction M of the fiber arranged in the stacking direction T1, the seismic energy acts to deform the stacked portion 3 (elastic body 1) in the horizontal direction T2, and the fiber body. A tensile force acts on the fibers 4 and horizontal deformation of the laminated portion 3 is suppressed. When the large amount of seismic energy acts and the amount of horizontal deformation of the laminated portion 3 exceeds a certain value, the fibers of the fiber body 4 stretch and break, and the seismic energy can be absorbed by the breaking energy of the fibers. . For this reason, it is possible to control the horizontal deformation amount of the laminated portion 3 by forming the fiber body 4 using fibers that are broken at a desired elongation amount as appropriate, and to increase the horizontal deformation amount. Accordingly, it is possible to obtain a seismic energy attenuation effect by breaking the fibers of the fibrous body 4 (according to the magnitude of the seismic energy).

  Therefore, according to the seismic isolation device A of the present embodiment, the fiber body 4 is arranged in a state in which the fiber direction M of the fiber is arranged in the stacking direction T1 on the stacked portion 3 in which the elastic bodies 1 and the stiffening bodies 2 are alternately stacked. By providing, it becomes possible to control the amount of horizontal displacement of the seismic isolation device A in the event of an earthquake and to absorb and attenuate the seismic energy by breaking the elastic body 1 in addition to the deformation of the elastic body 1. Become. As a result, the amount of horizontal deformation can be controlled in accordance with the magnitude of the seismic energy, and an excellent seismic energy attenuation effect can be exhibited to reliably suppress the shaking of the upper structure G1.

  And, in this way, it becomes possible to suppress the shaking of the upper structure G1 by exhibiting an excellent damping effect, for example, even when interposed between the main girder (main structure) of the bridge and the abutment, Unlike the conventional seismic isolation device, it is not necessary to set a large gap between the end portion of the main beam and the abutment, and it becomes possible to reduce the cost of a joint structure such as a finger joint.

Moreover, when the fiber body 4 is formed by combining a plurality of types of fibers having different elongation at break, when the laminated portion 3 is deformed in the horizontal direction due to the action of seismic energy, the fiber body 4 is deformed according to the amount of horizontal deformation. It is possible to break the fibers having the smaller breaking elongation and the fibers having the larger breaking elongation. Thus, for example, the fiber body 4 is formed by combining a fiber that breaks during a level 1 ground motion and a fiber that breaks during a level 2 ground motion. It is possible to reliably exhibit an excellent seismic energy attenuation effect while controlling the horizontal displacement.
Here, a plurality of fiber bodies 4 are provided in the laminated portion 3, and each fiber body 4 is formed by combining a plurality of types of fibers having different elongation at break. For example, as shown in FIG. The individual fiber bodies 4 ′, 4 ″ (4) are formed using the same type of fibers having the same breaking elongation, and the fiber bodies 4 ′, 4 ″ (4) are formed using fibers having different breaking elongations. You may make it do. In this case, seismic energy acts to deform the laminated portion 3 in the horizontal direction T2, and break from the fiber body 4 ′ (4 ″) formed using fibers having a small break elongation according to the amount of horizontal deformation. It becomes possible to break the fibers of the respective fiber bodies 4 ′, 4 ″ in the order of the fiber bodies 4 ″ (4 ′) using fibers having a large elongation. As a result, for example, a fiber is broken for each of a plurality of types of fiber bodies 4 ′, 4 ″ formed by fibers having different elongation at break, such as a fiber that breaks during a level 1 ground motion or a fiber that breaks during a level 2 ground motion. Since it is possible to break, it is possible to exhibit an excellent seismic energy attenuation effect while controlling the horizontal displacement of the seismic isolation device A for a wide range of seismic energy.

  Further, the fibrous body 4 is formed as an endless fiber bundle in which fibers are bundled, and the arcuate fixing portions 4b and 4c are elastic bodies 1 (1a and 1b) in a state in which the breaking portion 4a is arranged in the stacking direction T1. The elastic body 1 is compressed by a vertical load applied from the upper structure G1 and is pressed by the elastic body 1 so that the fixing portions 4b and 4c are easily and firmly stacked. It becomes possible to fix to. Thereby, when the laminated part 3 is deformed in the horizontal direction T <b> 2 due to the seismic energy and a tensile force is generated in the broken part 4 a of the fiber body 4, the fixing parts 4 b and 4 c are pulled out from the laminated part 3. (The fixing of the fiber body 4 is not released), and the fibers of the breaking portion 4a can be reliably stretched and broken according to the amount of horizontal deformation. Therefore, it is possible to more reliably exhibit an excellent seismic energy attenuation effect while controlling the amount of horizontal displacement of the seismic isolation device A.

As mentioned above, although one Embodiment of the seismic isolation apparatus which concerns on this invention was described, this invention is not limited to said one Embodiment, It can change suitably in the range which does not deviate from the meaning. For example, in the present embodiment, the fibrous body 4 is the broken portion 4a (the portion in which the fiber direction M of the plurality of fibers of the fibrous body 4 is arranged in the lamination direction T1 of the laminated portion 3) is the outer side (side surface side) of the laminated portion 3. However, in the seismic isolation device of the present invention, for example, as shown in FIG. You may arrange in parallel in the horizontal direction T2 which goes to the inside from the outer side. In this case, for example, a slit that communicates vertically is formed in the laminated portion 3 (the elastic body 1 and the stiffening body 2), and the fiber body 4 ″ is inserted and disposed in the slit, thereby laminating the fiber direction M of the fibers. The fiber body 4 '' can be installed in a state of being arranged in the direction T1. And each fiber body 4 ', 4''arranged in parallel is formed using the fiber in which breaking elongation differs, respectively, When seismic energy acts and the laminated part 3 deform | transforms in a horizontal direction, horizontal deformation Depending on the amount, the fiber body 4 ′ (4 ″) using fibers having a small breaking elongation arranged in parallel in the horizontal direction T2 from the outside to the inside of the laminated portion 3 to the fiber body 4 using fibers having a large breaking elongation. It becomes possible to break the fibers in the order of '' (4 '). As a result, for example, a fiber body 4 ′ (4 ″) using a fiber that breaks during a level 1 ground motion and a fiber body 4 ″ (4 ′) that uses a fiber that breaks during a level 2 ground motion are aligned. As with the present embodiment, it is possible to exert an excellent seismic energy attenuation effect while controlling the horizontal displacement of the seismic isolation device A for a wide range of seismic energy.

  Furthermore, in the present embodiment, the laminated portion 3 is formed in a rectangular parallelepiped shape, and the fiber bodies 4 are respectively installed on the four side surfaces. However, in the seismic isolation device of the present invention, for example, as shown in FIG. Alternatively, the laminated portion 3 may be formed in a columnar shape, and the fiber body 4 may be arranged in parallel in the circumferential direction of the laminated portion 3. In this case, for example, even when a plurality of fiber bodies 4 formed using the same type of fibers having the same elongation at break are provided, deformation occurs when the laminated portion 3 is deformed in the horizontal direction T2 due to the seismic energy. The tensile force acting on the fibers of each fiber body 4 (and each fiber forming the same fiber body 4) can be changed in accordance with the direction (direction of action of seismic energy). Thereby, in addition to the magnitude of the horizontal deformation amount of the laminated part 3 and the magnitude of the seismic energy, the fibers of the fiber bodies 4 arranged in parallel in the circumferential direction of the laminated part 3 in accordance with the deformation direction of the laminated part 3 It becomes possible to make it break sequentially and stepwise, and it becomes possible to exhibit an excellent attenuation effect of seismic energy while controlling the horizontal displacement amount of the seismic isolation device A, as in this embodiment. In this case, fiber bodies 4 formed by combining a plurality of types of fibers having different elongation at break are juxtaposed in the circumferential direction of the laminated portion 3, or individual fiber bodies 4 ′, 4 ″ (4) are broken. A plurality of types of fiber bodies 4 ′, 4 ″ formed using fibers of the same type having the same elongation and different in elongation at break may be arranged side by side in the circumferential direction of the laminated portion 3. .

  In the present embodiment, the fiber body 4 is an endless fiber bundle in which fibers are bundled. However, the fiber body according to the present invention is formed by including fibers, and the stacking direction T1 of the stacked unit 3 As long as it is provided so that the fiber direction M is arranged, for example, a fiber sheet in which fibers are arranged to form a sheet may be used. In this case, both ends of the fiber sheet (fiber body) can be easily fixed by, for example, fixing the laminated sheet 3 with an adhesive. And when seismic energy acts and the laminated part 3 deform | transforms into the horizontal direction T2, the fiber of a fiber sheet is extended according to this horizontal deformation amount, and it is possible to break a fiber sequentially. Therefore, as in the present embodiment, it is possible to exhibit an excellent damping effect of seismic energy while controlling the horizontal displacement amount of the seismic isolation device A.

It is sectional drawing which shows the seismic isolation apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the seismic isolation apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the modification of the seismic isolation apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the modification of the seismic isolation apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic body 2 Stiffening body 3 Lamination | stacking part 4 Fiber body 4 'Fiber body 4''Fiber body 4a Breaking part 4b Fixing part 4c Fixing part 5 Protective cover A Seismic isolation device G1 Upper structure G2 Lower structure M Fiber direction T1 Lamination direction ( Vertical direction)
T2 horizontal direction

Claims (4)

A seismic isolation device interposed between the superstructure and the substructure, for absorbing and attenuating seismic energy that acted during an earthquake and suppressing the shaking of the superstructure,
It is formed by integrally providing a fibrous body made of fibers in a laminated portion in which elastic bodies and stiffening bodies are alternately laminated,
Multiple provided in a state in which the fiber body is arranged fiber direction of the plurality of fibers in a stacking direction of the laminated portion,
Each of the fibrous bodies is formed using the same type of fibers having the same breaking elongation, and the fibrous bodies are formed using fibers having different breaking elongations . The seismic isolation device according to claim 1,
The seismic isolation device, wherein the fiber bodies formed using fibers having different elongation at break are arranged in parallel in a horizontal direction from the outside to the inside of the laminated portion. In the seismic isolation device according to claim 1 or claim 2,
The base part is formed in a columnar shape, and the fibrous body is arranged in parallel in the circumferential direction of the base part. In the seismic isolation apparatus in any one of Claims 1-3,
The fibrous body is formed as an endless fiber bundle in which fibers are bundled,
A pair of arcuate fixing portions connected to the pair of fracture portions are embedded in the elastic body of the lamination portion in a state where the pair of fracture portions having the fiber directions parallel to each other are arranged in the lamination direction. Seismic isolation device characterized by being.

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