JP4212610B2 - Seismic isolation structure - Google Patents

Description

  The present invention relates to a seismic isolation structure, and in particular, includes a displacement proportional seismic isolation device that insulates ground vibrations from being transmitted directly to the structure, and a speed proportional seismic control device that absorbs seismic energy. Related to seismic isolation structures.

  As a seismic isolation structure equipped with a conventional seismic control device, for example, there is a technique disclosed in Japanese Patent Publication No. 7-81422. This technology relates to a vibration control device that uses viscosity to attenuate horizontal and vertical vibrations generated in a base-isolated structure. As shown in FIG. 15, the vibration control device is attached to one structure. A fixed container 1, a rod 2 inserted into the container 1 and fixed vertically to the other structure, a viscous fluid 3 that fills the container 1 and generates a viscous resistance force when the rod 2 is displaced relative to the container 1, and The container 1 includes a telescopic cover 4 that seals the structure 2 to which the rod 2 is fixed and does not restrict movement of the rod 2 relative to the container 1 while the rod 2 penetrates. And this kind of seismic control device requires a certain plane space because of its shape, and the installation floor is generally a seismic isolation floor that is not a living space.

  Further, due to the mechanism of the vibration control device, the damping resistance force in the horizontal direction is generally smaller than the damping resistance force of the device using the viscosity of the viscous fluid interposed between the opposing horizontal plates. Therefore, the seismic isolation structure provided with this kind of seismic isolation device in the middle floor seismic isolation has a drawback that it is difficult to control the horizontal deformation and the horizontal force generated in the column.

Japanese Patent Publication No. 7-81422

  In the above-mentioned conventional technology, the displacement of the ceiling facing the floor is large with respect to the floor where the seismic isolation device is installed, and the shape can not be planned to fit in the wall, for example, so There was a problem that it was difficult to install a vibration control device on the floor. Furthermore, with the above-mentioned seismic control device alone, the proportion of the damping force in the horizontal direction is small, and the amount of the damping force applied to the seismic isolation device increases accordingly. As a result, when the seismic isolation device is installed at the top of the column, there is a problem that the stress of the column increases. For this reason, it has been necessary to increase the strength of the pillars on the floor where the seismic isolation device is installed. In addition, for example, when an existing structure is remodeled into a seismic isolation structure, there is a problem that a large-scale reinforcement of the column is necessary, the remodeling cost increases, and the remodeling period becomes long.

  The present invention has been made in order to solve the above-described problems, and the displacement of the ceiling under the beam facing the floor can be reduced with respect to the floor on the foundation on which the seismic isolation device is installed, and the column body is reinforced. The purpose is to provide a seismic isolation structure that minimizes the risk.

To achieve the above object, the seismic isolation structure of the present invention is a seismic isolation structure that is installed on the same floor by combining a displacement proportional seismic isolation device and a velocity proportional seismic control device with an existing structure. The seismic isolation device is formed by laminating a rubber layer mainly composed of natural rubber and a reinforcing plate such as a steel plate, and is integrally formed by vulcanization adhesion or the like, and is hollow by a central hole provided in the center. The flange plate is joined to the upper and lower sides, and this flange plate is connected to the cut portion of the column. The vibration control device has a screw portion formed on its mounting member, and the ball portion is formed on the screw portion. A guide nut is rotatably screwed through a bearing, a rotating inner cylinder is fixed to the guide nut, and the other mounting member is fixed to a fixed outer cylinder, and is guided into the fixed outer cylinder. The nut and the rotating inner cylinder are It is supported rotatably via a bearing, a viscous fluid is sealed between the rotating inner cylinder and the fixed outer cylinder, and when the structure is deformed, it is compressed or extended via a brace member, and both mounting members And the guide nut is rotated through the threaded portion, the rotating inner cylinder rotates in the viscous fluid, and the seismic isolation is a damping rod that absorbs seismic energy by viscous resistance at this time In the structure, the seismic isolation device is installed in a cut portion cut in the middle of the column body of the structure, and the vibration control device includes the intersection of the foundation of the structure and the column, and the intersection of the column and the beam. The seismic isolation device and the seismic control device exhibit a maximum damping force at the maximum displacement, and the seismic control device exhibits a maximum damping force at the minimum displacement. Configured to function in a complementary manner Reinforcement, characterized in that it comprises a columnar body which minimal.

  According to the present invention configured as described above, by installing a displacement proportional type seismic isolation device and a speed proportional type seismic control device in combination on the same floor, the energy of the inputted earthquake is The device absorbs the maximum energy at the maximum displacement, while the seismic control device absorbs the energy of the earthquake by exhibiting the maximum damping force at the minimum displacement, and makes the two function in a mutually restraining manner. Thus, the energy of the earthquake can be absorbed efficiently. For this reason, the displacement between the floor and the ceiling can be reduced, the reinforcement of the column can be minimized, the cost of the seismic isolation structure can be reduced, and the modification can be performed in a short time and at a low cost.

  Embodiments of the invention will be described with reference to the drawings. FIG. 1 is a front view of an embodiment of the seismic isolation structure of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1. In the figure, the structure 10 includes a foundation 12 and a column 14. In this embodiment, it is a four-story structure made of reinforced concrete. Each column 14 of the first floor portion is cut in the middle of the upper portion, and a displacement proportional type seismic isolation device 18 is installed in this cut portion. The seismic isolation device 18 reduces the seismic force itself applied to the structure by insulating the ground vibration during an earthquake or the like, and has a maximum damping performance at the maximum displacement.

  Between the foundation 12 and the beam 16 in the first floor portion of the structure 10, a speed proportional type vibration control device 20 is installed. This seismic control device 20 is also referred to as a viscous seismic control device, and allows the input of seismic motion to the structure, but attenuates the response speed of the subsequent structure, and is approximately in the middle of the displacement. It has maximum attenuation performance at point or maximum speed. As shown in FIG. 2, a plurality of vibration control devices 20 are installed depending on the scale, structure, etc. of the structure, and in this embodiment, the X direction and the Y direction are almost equally balanced in a plane. Four are installed at symmetrical positions. Thus, the seismic isolation device 18 and the vibration control device 20 are installed in combination on the same floor portion of the first floor.

  Here, an embodiment of the seismic isolation device 18 will be described in detail with reference to FIG. FIG. 3 shows a partially broken perspective view of the seismic isolation device 18 for natural rubber-based laminated rubber. The seismic isolation device 18 is formed by laminating a rubber layer 21 mainly composed of natural rubber and a reinforcing plate 22 such as a steel plate, and is integrally formed by vulcanization adhesion or the like, and is hollowed by a central hole 23 provided in the center. It has become. The seismic isolation device 18 may not have the center hole 23. And the flange plates 24 and 24 are joined to the upper and lower sides. The flange plates 24 and 24 are connected to the cut portion of the column 14. A total of twelve seismic isolation devices 18 are installed in the middle of each column 14 in the X and Y directions, as shown in FIG.

  The seismic isolation device 18 exhibits a large rigidity with respect to a load acting in a direction perpendicular to the plate surface of the flange plate 24 (vertical direction), and with respect to a load acting in a direction along the plate surface (horizontal direction). Shows flexibility. Therefore, it supports the load of the structure with vertical rigidity in the vertical direction, and has horizontal rigidity in the horizontal direction during earthquakes to reduce the input acceleration of the earthquake so as not to transmit the earthquake energy directly, reducing the vibration of the structure 10 To do.

  The damping wall 20 as one embodiment of the damping device will be described in detail with reference to FIG. Fig.4 (a) is a front view of the damping wall 20, FIG.4 (b) is BB sectional drawing of Fig.4 (a). In this figure, the damping wall 20 is suspended from the upper floor, ie, the beam 16, and is supported by a pin support mechanism 26a, and surrounds the inner plate 26 and is supported by the lower floor, ie, the foundation 12, by the pin support mechanism 28a. The outer container 28 and the viscous fluid 30 filled in the outer container 28 are installed in a narrow wall space between the foundation 12 and the beam 16. As the viscous fluid 30, for example, a highly viscous fluid such as polyisobutylene and other viscoelastic bodies are used.

  The damping wall 20 generates a viscous damping force proportional to the speed difference of the relative motion between the inner plate 26 and the outer container 28 between the upper and lower layers, and absorbs vibration energy. It is called a seismic device. Therefore, when movement occurs between the upper and lower layers during an earthquake, the inner plate 26 moves in the viscous fluid 30 in the outer container 28, thereby absorbing the vibration energy of the earthquake. Since the damping wall 20 is supported by the pin support mechanisms 26a and 28a as described above, it can also follow deformations other than the surface direction of the inner plate 26. The damping wall is not limited to the one using the pin support mechanism as described above, but may be configured to fix the outer container, support the inner plate via the slide mechanism, and follow the deformation other than the surface direction. Good. In addition, this embodiment is good also as a base-type seismic isolation structure which does not use the 1st floor as a living space.

  The operation of the above embodiment will be described. In the seismic isolation structure 10 of this embodiment, when an earthquake occurs, the foundation 12 and the first floor portion of the column 14 below the seismic isolation device 18 vibrate following the ground due to the earthquake. However, in the second, third, and fourth floors above the seismic isolation device 18, the seismic energy is reduced by the seismic isolation device 18 and the seismic control device 20, and the displacement proportional seismic isolation device 18 exhibits the maximum damping force at the maximum displacement. The speed-proportional vibration control device 20 exerts complementary functions so as to exhibit the maximum damping force at the minimum displacement, so that vibration deformation is reduced to about ½ in a normal earthquake. According to experiments, it has been confirmed that the displacement of the second, third, and fourth floors is significantly reduced to about 17 cm, while the ground displacement is about 30 cm during the Great Hanshin Earthquake.

  In this way, even when a large earthquake occurs, the amount of deformation between the upper and lower flange plates 24, 24 of the seismic isolation device 18 is kept small, and the displacement between the lower floor foundation 12 and the upper floor beam 16 is small. It can be suppressed. Since the seismic isolation device 18 is installed in the middle of the column 14 and can be miniaturized, and the seismic control device 20 is also installed in a narrow wall space, the first floor portion where the seismic isolation device and the seismic control device are installed is inhabited. It can be used effectively in space.

  Next, another embodiment of the seismic isolation device 18 will be described with reference to the history characteristic diagram of FIG. The seismic isolation device 18 has substantially the same configuration as that of the embodiment shown in FIG. 3 described above, but is characterized in that high damping rubber is used instead of natural rubber and laminated. This high damping rubber is produced by adding an additive exhibiting high damping properties such as carbon black to a raw material such as natural rubber, and exhibits a hysteresis characteristic as shown in FIG.

  In FIG. 5, the vertical axis indicates the shearing force F (tons), the horizontal axis indicates the displacement d (millimeters), the solid line a indicates the hysteresis curve of the high-damping rubber, and the broken line B indicates the hysteresis curve of the natural rubber. Show. As shown in the figure, it can be seen that the high-damping rubber provides much greater hysteresis characteristics than the natural rubber, and thus exhibits a great damping property. In the case of the seismic isolation device 18 using this highly damped rubber, the amount of deformation can be further reduced as compared with the case of the natural rubber described above.

  Another embodiment of the seismic isolation structure of the present invention will be described with reference to FIGS. FIG. 6 is a front view of another embodiment of the seismic isolation structure of the present invention, FIG. 7 (a) is a perspective view of essential parts of the seismic isolation device, and FIG. 7 (b) is a sectional view of essential parts of another seismic isolation device. FIG. 8 is a cross-sectional view of the main part of the vibration control device. In the figure, components substantially equivalent to those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The seismic isolation device 32 of this embodiment is a rolling support type, that is, a cross linear bearing type seismic isolation device, and includes a block body 33 and two orthogonal axes arranged via the block body 33, that is, an X direction rail 34. And a Y-direction rail 35, and a bearing ball 36 that is disposed between the block body 33, the X-direction rail 34, and the Y-direction rail 35 so as to be able to roll. Therefore, the X direction rail 34 is slidable in the X direction with respect to the block body 33, and the Y direction rail 35 is slidable in the Y direction.

  The X direction rail 34 of the seismic isolation device 32 is fixed on the foundation 12, and the column body 14 is coupled on the Y direction rail 35. In this way, the structure 10 is slidably coupled to the foundation 12 via the seismic isolation device 32 in two directions, the X direction and the Y direction, and is insulated so as not to directly transmit the vibration of the ground. As with the seismic isolation device 18 shown in FIG. 2, twelve seismic isolation devices 32 are installed in the lower part of the middle of each column 14 in the X and Y directions.

  As the seismic isolation device, a sliding support type seismic isolation device 38 can be used in addition to the above-described rolling support type seismic isolation device 32. That is, in FIG. 7B, the seismic isolation device 38 includes a sliding plate 39 fixed on the foundation 12 and a sliding bearing 40 that is slidably positioned on the upper surface of the sliding plate 39. The sliding plate 39 is made of a stainless steel plate or the like having a smooth surface, and the sliding support 40 is made of a steel plate or the like having a coating made of tetrafluoroethylene resin or the like on the surface. The friction coefficient is set to be extremely small. The column bodies 14 are connected to the upper portion of the sliding bearing 40.

  The vibration control device 42 used in this embodiment includes a fixed member 46 having rigidity connected to two inclined members 44 fixed to the foundation 12 and a receiving member 48 fixed to the beam 16 on the second floor. The oil damper 50 is interposed between the fixing member 46 and the receiving member 48. As in the case of the vibration control device 20 shown in FIG. 2, the vibration control device 42 has, for example, four symmetrically arranged planes in the X direction and the Y direction in a substantially equal balance. It is installed in a narrow wall space between the foundation 12 and installed so as not to protrude into the living space. Note that the inclined member may be fixed to the beam side, and the fixing member, the receiving member, and the oil damper may be reversed to the base side.

  The oil damper 50 has a cylinder / piston structure, and a viscoelastic body 58 accommodated in two chambers 56 and 56 divided by a piston 54 in a cylinder 52 as shown in FIG. Are configured to flow. One chamber 56 is provided with a buffer chamber 62, and a pad 64 is attached to the tip of the piston rod. Further, coil springs 66 and 66 are wound around the outer periphery of the piston rod, and have a function of returning the piston 54 to the center. Since the cylinder 52 is fixed to the receiving member 48 with a screw or the like, and the pad 64 is also fixed to the fixing member 46 with a screw or the like, the oil damper 50 is configured to perform a vibration control action in the reciprocating direction. Reference numeral 53 denotes air bleeding.

  Hereinafter, the operation of the seismic isolation structure according to the embodiment of FIGS. When an earthquake occurs, the vibration of the ground and the foundation 12 is not directly transmitted to the structure 10 by the seismic isolation device 32, and the vibration is reduced by the X direction rail 34 and the block body 33, and the Y direction rail 35 and the block body 33. . When a displacement occurs between the fixing member 46 fixed to the foundation 12 via the inclined members 44 and 44 and the beam 16 of the structure 10, the piston 54 of the oil damper 50 moves in the cylinder 52. Thereby, the viscoelastic body 58 in the chambers 56, 56 of the cylinder 52 moves through the communication pipe 60, and vibration energy is absorbed by this viscous resistance force. In the case of this embodiment as well, the amount of deformation of the seismic isolation device 32 can be reduced relative to the displacement of the earthquake, the displacement of the structure 10 can be greatly reduced, the size of the seismic isolation device can be reduced, Since the seismic device is located in the wall space, the first floor portion can be used as a living space. The same effect can be obtained with the sliding support type seismic isolation device 38.

  Next, still another embodiment of the seismic isolation structure of the present invention will be described with reference to FIGS. FIG. 9 is a front view, and FIG. 10 is a cross-sectional view of a damping piece that is a vibration control device. In the figure, components substantially equivalent to those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The structure 10 includes a foundation 12, a column 14, and a beam 16, and a plurality of laminated rubber type seismic isolation devices 18 are installed in the middle of the column 16 as in FIG. 2.

  A receiving portion 68 protrudes from an intersection between the foundation 12 and the column 14, and a receiving portion 70 protrudes from an intersection between the column 14 and the beam 16. And between the both receiving parts 68 and 70, the damping device comprised from the attenuation | damping piece 72 and the brace member 74 is installed. As in FIG. 2, the vibration control device is installed in a symmetrical position in a substantially equal balance in the X and Y directions, and in FIG. 9, the damping piece 72A and the brace member 74A located in the crossing state are shown in FIG. Fig. 2 shows a depth-direction seismic control device.

  Here, the attenuation piece 72 will be described in detail with reference to FIG. A screw portion 77 is formed on the mounting member 76, and a guide nut 80 is rotatably engaged with the screw portion 77 via a ball bearing 78. Another mounting member 82 is fixed to the casing 84, and a guide nut 80 is rotatably supported in the casing 84 via ball bearings 86 and 86. A disc-shaped rotary piece 88 is fixed to the guide nut 80, and a viscous fluid 90 is sealed in a casing 84 around the rotary piece 88. As the viscous fluid 90, a highly viscous fluid using polyisobutylene or the like is used.

  When the structure 10 is deformed due to an earthquake or the like, the attenuation piece 72 is compressed or expanded via the brace member 74, and the distance between the attachment members 76 and 82 is changed. Due to this change, the guide nut 80 is rotated via the screw portion 77, and the rotary piece 88 rotates in the viscous fluid 90, and the seismic energy is absorbed by the viscous resistance at this time. Since the damping device using the damping piece 72 rotates the rotating piece 88 to absorb energy, it functions effectively during a relatively small earthquake. In the case of this embodiment, the same effects as those of the above-described embodiment can be obtained.

  Still another embodiment of the vibration control device will be described in detail with reference to FIG. FIG. 11 shows a cross-sectional view of a damping rod 92 that is a vibration control device. Similarly to the vibration control device shown in FIG. 9, the damping rod 92 is installed in an inclined state between the intersection of the foundation and the column and the intersection of the column and the beam, and is shown in FIG. In this way, they are installed at symmetrical positions in a plurality of places with a substantially equal balance in a plane.

  In the figure, a screw portion 95 is formed on the mounting member 94, and a guide nut 98 is rotatably screwed to the screw portion 95 via a ball bearing 96. The rotating inner cylinder 100 is fixed to the guide nut 98. The other mounting member 102 is fixed to the fixed outer cylinder 104, and a guide nut 98 and a rotating inner cylinder 100 are rotatably supported in the fixed outer cylinder 104 via ball bearings 106 and 106. A viscous fluid 108 is sealed between the rotating inner cylinder 100 and the fixed outer cylinder 104.

  Therefore, in the above-described damping rod 92, when an earthquake occurs and deformation occurs between the attachment members 94 and 102, the guide nut 98 and the rotating inner cylinder 100 are rotated by the screw portion 95 and the guide nut 98, and the viscosity is reduced. Seismic energy is absorbed by the rotational speed being attenuated by the viscous resistance of the fluid 108. This attenuation bar 92 also has the same effect as the above-described embodiments, and functions effectively particularly in the case of a relatively small-scale earthquake.

  Next, another embodiment of the vibration control device will be described with reference to FIGS. FIG. 12 shows a front view of a main part of a vibration control post that is a vibration control device, and FIG. 13 shows a cross-sectional view of the vibration control post of FIG. In the figure, components substantially equivalent to those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The vibration control device 110 includes vibration control posts 116, 116 installed between receiving portions 112, 112 protruding from the foundation 12 of the structure 10 and receiving portions 114, 114 protruding from the beam 16. It is provided. As shown in FIG. 13, the damping post 116 includes a shaft member 118 and a cylindrical member 120, in which a viscous fluid 122 is sealed and sealed with a sealant 126 in a state having a space 124. It has been stopped.

  The damping post 116 is compressed or expanded when the structure 10 is deformed by an earthquake, and absorbs the earthquake energy by the viscous resistance force when the shaft member 118 reciprocates in the viscous fluid 122. The space 124 is an escape portion for rising the liquid level when the vibration control post 116 is compressed. This seismic control post 116 has a simple structure and has an effect that maintenance and the like can be easily performed. In this embodiment, the two seismic control posts are installed in the downwardly opened state, but the same effect can be obtained even when installed in the upwardly opened state.

  Still another embodiment of the seismic isolation structure of the present invention will be described with reference to FIG. FIG. 14 is a front view thereof. In the figure, the beam on the second floor is divided into three, the intermediate beam 16a is supported by the columns 14b and 14c, and the beams 16b and 16c on both sides rise from the columns 12a and 14d and the foundation 12. Are supported by auxiliary columns 15 and 15.

  The seismic isolation devices 18a and 18d on both sides are installed on the second floor portion of the column bodies 14a and 14d, and the central seismic isolation devices 18b and 18c are installed on the first floor portion of the column bodies 14b and 14c. In this case, the first floor seismic isolation walls 20b are installed corresponding to the first floor seismic isolation devices 18b and 18c, and the second floor seismic isolation walls 20a and 20c correspond to the second floor seismic isolation devices 18a and 18d. is set up. Other reference numerals are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  In this embodiment as well, the seismic isolation device and the vibration control device are installed on the same floor in the same manner as the above-described embodiment, so that the amount of deformation of the seismic isolation device can be reduced. The size can be reduced and the configuration can be simplified.

  In each of the above-described embodiments, as a preferred embodiment, the seismic isolation device and the vibration control device are installed on the first floor, and on the first and second floors. However, the present invention is not limited to this. For example, it may be installed on other floors including the basement floor, and may be installed on a plurality of floors. In addition, installing on the same floor makes the 1st and 2nd floors open, installs seismic isolation devices at appropriate positions on the 1st and 2nd floor pillars, and installs vibration control devices on the 1st floor and 2nd floor. Including installation between the ceiling.

  As described above, according to the present invention, the displacement proportional type seismic isolation device and the velocity proportional type seismic control device are installed on the same floor, and the damping function of the seismic isolation device and the seismic control device are combined. Since the damping function is complementarily functioned, the amount of deformation of the seismic isolation device can be reduced. For this reason, it is possible to simplify the structure of the base-isolated structure by minimizing the reinforcement of the column body. In addition, when an existing structure is remodeled into a seismic isolation structure, the construction period can be shortened and the cost can be reduced.

It is the front view which fractured | ruptured a part of one Embodiment of the seismic isolation structure of this invention. It is sectional drawing in the AA of FIG. It is the perspective view which fractured | ruptured some natural rubber type laminated rubber seismic isolation devices installed in FIG. (A) is a front view of the damping wall which is the damping device installed in FIG. 1, (b) is the BB sectional drawing of Fig.4 (a). It is a hysteresis characteristic figure of the high attenuation | damping laminated rubber which is other embodiment of a seismic isolation apparatus. It is a front view of other embodiment of the seismic isolation structure of this invention. (A) is the principal part perspective view which fractured | ruptured a part of rolling support type seismic isolation apparatus installed in FIG. 6, (b) is principal part sectional drawing of another sliding support type seismic isolation apparatus. It is sectional drawing of the oil damper which is a damping device installed in FIG. It is a front view of other embodiment of the seismic isolation structure of this invention. It is sectional drawing of the attenuation | damping piece which is a seismic control apparatus installed in FIG. It is sectional drawing of the damping rod which is other embodiment of a damping device. It is a principal part front view of the damping post which is other embodiments of a damping device. It is sectional drawing of the damping post of FIG. It is a front view of other embodiment of the seismic isolation structure of this invention. It is a block diagram which shows the conventional damping device.

Explanation of symbols

10 Structure 12 Foundation 14, 14a, 14b, 14c, 14d Column 15 Auxiliary columns 16, 16a, 16b, 16c Beams 18, 18a, 18b, 18c, 18d Seismic isolation devices 20, 20a, 20b, 20c Damping walls 21 Rubber layer 22 Reinforcement plate 23 Center hole 24 Flange plate 26 Inner plate 28 Outer container 26a, 28a Pin support mechanism 30 Viscous fluid 32 Rolling support type seismic isolation device 33 Block body 34 X direction rail 35 Y direction rail 36 Bearing ball 38 Sliding support Type seismic isolation device 39 Sliding plate 40 Sliding support 42 Damping device 44 Inclining member 46 Fixing member 48 Receiving member 50 Oil damper 52 Cylinder 53 Air vent 54 Piston 56 Cylinder chamber 58 Viscoelastic body 60 Communication pipe 62 Buffer chamber 64 Pad 66 Coil springs 68, 70 Receiving portion 72 Damping piece 74 Brace member 7 6, 82 Mounting member 77 Threaded portion 78, 86 Ball bearing 80 Guide nut 84 Casing 88 Rotating top 90 Viscous fluid 92 Damping rod 94, 102 Mounting member 95 Threaded portion 96 Ball bearing 98 Guide nut 100 Rotating inner cylinder 104 Fixed outer cylinder 106 Ball bearing 108 Viscous fluid 110 Damping device 112, 114 Receiving portion 116 Damping post 118 Shaft member 120 Cylindrical member 122 Viscous fluid 124 Space 126 Sealing material

Claims (1)

A seismic isolation structure that is installed on the same floor by combining a displacement proportional seismic isolation device and a speed proportional seismic control device with an existing structure,
The seismic isolation device is formed by laminating a rubber layer mainly composed of natural rubber and a reinforcing plate such as a steel plate, and is integrally formed by vulcanization adhesion or the like. The flange plate is joined, and this flange plate is connected to the cut part of the column,
The vibration control device has a threaded portion formed on its mounting member, and a guide nut is rotatably screwed to the threaded portion via a ball bearing, and a rotating inner cylinder is fixed to the guide nut, The other mounting member is fixed to a fixed outer cylinder, and a guide nut and the rotating inner cylinder are rotatably supported through the ball bearing in the fixed outer cylinder, and the rotating inner cylinder and the fixed outer cylinder are supported. When the structure is deformed, it is compressed or expanded via the brace member, the distance between the two mounting members changes, and the guide nut rotates via the threaded portion. In the seismic isolation structure which is a damping rod that absorbs the seismic energy by the viscous resistance at this time when the rotating inner cylinder rotates in the viscous fluid,
The seismic isolation device is installed in a cutting section cut in the middle of the upper part of the column of the structure,
The seismic control device is installed in an inclined state between the foundation of the structure and the intersection of the column and the intersection of the column and the beam,
The seismic isolation device and the seismic control device are configured to function complementarily so that the seismic isolation device exhibits a maximum damping force at the maximum displacement, and the seismic control device exhibits a maximum damping force at the minimum displacement. Seismic isolation structure characterized by having a column that requires minimal reinforcement.

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