JP5794528B2 - Seismic isolation structure - Google Patents

Description

  The present invention relates to a seismic isolation structure for a high-rise building or a super-high-rise building (a seismic isolation / seismic control combined structure using both a base isolation structure and a vibration control structure).

  As is well known, the seismic isolation structure is designed to reduce the input of seismic energy to the building by separating the ground and the building by supporting the building with a seismic isolation device such as laminated rubber. Is to install a vibration control device (damper) in the building to absorb the seismic energy and reduce the vibration response.

  In addition, as shown in Patent Document 1, there is also a proposal for a seismic isolation / seismic combined structure (that is, a seismic isolation structure) that uses both the seismic isolation structure and the damping structure to exhibit both the seismic isolation function and the damping function. Has been made.

Japanese Patent Laid-Open No. 11-241524

In conventional seismic isolation structures and seismic isolation structures, seismic isolation devices are installed on the base of the building (in the case of basic seismic isolation) or the middle floor in the lower part (in the case of intermediate floor seismic isolation). It cannot always absorb energy efficiently.
In other words, the interlaminar shear deformation angle is generally larger in the middle floor than in the lower and upper floors, but in conventional seismic isolation structures, the seismic effect of the entire building at the time of the earthquake is limited to the seismic isolation device installed on the lower floor Since energy is absorbed, efficient energy absorption corresponding to the distribution of the interlaminar shear deformation angle from the middle floor to the upper floor cannot be performed.

  In addition, in the conventional seismic isolation structure, the pull-out force due to the overturning moment acts on the seismic isolation device, so the seismic isolation device needs to be resistant to it, and a fail-safe mechanism is also required to prevent accidental falls. In addition, it is necessary to sufficiently strengthen the columns and beams in order to suppress the floating and deformation of the entire building.

  In addition, the structure of high-rise or super-high-rise buildings in recent years is not only to reduce the displacement of buildings during a huge earthquake as much as possible, but also to allow the building to stop quickly by converging after shaking in a short time. There is also a strong desire to be.

  In view of the above circumstances, the present invention effectively absorbs seismic energy by exhibiting excellent seismic isolation and seismic control effects, and is effective and appropriate seizure that can sufficiently suppress displacement and post-shock even during a huge earthquake. The purpose is to provide seismic structures.

  The present invention is a seismic isolation structure for a high-rise or super-high-rise building, the main body portion in a plan view with a tube frame and the core portion that is constructed at the center position independently of the main body portion. To secure clearance to allow horizontal relative vibration between the main body part and the core part, and the main body part is installed on the foundation structure with seismic isolation support by the bottom seismic isolation device The core portion is relatively rigid than the main body portion and is rigidly connected to the foundation structure and installed in a self-supporting state, and a top seismic isolation device is provided between the top portion of the core portion and the main body portion. A variable stiffness damper as an intermediate part damping device is interposed between the core part in the height direction intermediate part and the core part in multiple stages at intervals in the vertical direction, Between the bottom and the base structure and the top of the body and the Displacement sensors that detect the relative displacement in the horizontal direction generated between them are installed between the two parts, and the rigidity of the variable rigidity damper as the intermediate part damping device based on the detection result of the displacement sensor Is configured to be controllable.

According to the present invention, since the entire main body is seismically isolated and supported by the bottom seismic isolation device, not only an excellent seismic isolation effect can be obtained for the main body as in a normal seismic isolation structure, Since the main body part is isolated from the top by the top seismic isolation device installed between the top part of the core part and the main body part built independently of the main body part, both the main body part and the core part Bending deformation can be effectively suppressed.
In addition, since the horizontal relative vibration between the main body and the core is allowed within the clearance range, the intermediate part damping device is provided in multiple stages between them. The seismic control device operates efficiently and effectively absorbs seismic energy, and an excellent seismic control effect is obtained.
In addition, by using a variable stiffness damper as an intermediate vibration control device, optimally controlling the rigidity of the variable stiffness damper according to the vibration status of the main body detected by the displacement sensor, the intermediate portion of the main body can be adjusted to the intermediate portion. It is supported by the core part via the vibration control device, and the displacement is effectively restrained, and the after shaking can be quickly converged.

It is a schematic diagram which shows the basic composition of the seismic isolation structure of this invention. It is an elevation sectional view showing the example of the building by the seismic isolation structure which is the embodiment of the present invention. It is a top view of a bottom part same as the above. It is a top view of the same as the above. It is a top view of an intermediate part. It is a figure which shows another specific example same as the above. It is a figure which shows another specific example same as the above. It is a schematic diagram which shows the other basic composition of the seismic isolation structure of this invention.

The basic configuration of the seismic isolation structure of the present invention will be described with reference to FIG.
FIG. 1 schematically shows a vertical section of a high-rise or super-high-rise building with the seismic isolation structure of the present invention. Reference numeral 1 is a foundation bottom, 1a is a pile, 2 is rigidly connected to the foundation bottom 1, and is self-supporting. The core part 3 constructed in (1) is an annular main body part surrounding the core part 2 and constructed around it.

  The core portion 2 is a high-rigidity structure constructed by a core wall or truss structure, and a high-rigidity top structure 2a such as a hat truss protruding above the main body 3 is integrally formed on the top portion. Is provided. The interior of the core part 2 can be used as an installation space for shared facilities such as elevators and stairs, or can be used as an installation space for tower parking.

The main body 3 is structurally constructed independently of the core 2 and is the main living space of this building, and the outer tube frame and the inner tube frame are connected by beams on each floor. Thus, the annular tube structure surrounding the core portion 2 is used.
The main body 3 is structurally relatively low in rigidity compared to the core 2 (in other words, the core 2 is higher in rigidity than the main body 3). And the core part 2 exhibit different vibration characteristics. In the event of an earthquake, horizontal relative vibration occurs between them, and a clearance 4 for allowing the relative vibration is provided between the core part 2 and the main body. It is secured over the entire circumference between the part 3.
The core part 2 is installed in a self-supporting state in a state of being rigidly connected to the foundation bottom board 1, while the main body part 3 is entirely placed on the foundation bottom board 1 by a bottom seismic isolation device 5 such as laminated rubber. A seismic isolation support is provided, and a top seismic isolation device 6 such as laminated rubber is also interposed between the top of the main body 3 and the top structure 2 a of the core 2.

  As a result, the upper and lower parts of the main body part 3 are supported by the base isolation device 6 and the base isolation device 5, and the entire main body part 3 is in a horizontal direction with respect to the core part 2 in the event of an earthquake. Horizontal displacement such as sliding, or bending deformation in which the main body 3 bends laterally as shown in the figure between the upper and lower support points, and horizontal vibration due to this is allowed within the above clearance 4 range. It has come to be.

  Furthermore, a plurality of intermediate part damping devices 7 functioning as dampers are interposed between the core part 2 and the intermediate part in the height direction of the main body part 3 in multiple stages (six stages in FIG. 1). When the relative vibration in the horizontal direction as described above occurs between the part 3 and the core part 2, the intermediate part damping device 7 is activated to efficiently absorb the seismic energy.

The intermediate part damping device 7 employs a variable stiffness damper capable of adjusting the rigidity as a damper, specifically, for example, a known variable friction damper, a variable damping damper, and various actuators. It is possible to appropriately control the rigidity of the intermediate vibration control device 7.
And in order to perform such control, between the bottom part of the main-body part 3 and the foundation bottom board 1, and between the top part of the main-body part 3, and the top structure 2a of the core part 2, displacement sensor 8, 9 is each respectively. Is installed, and the rigidity of each of the intermediate vibration control devices 7 is optimally controlled every moment according to the vibration state of the main body 3 detected by the displacement sensors 8 and 9.

That is, the displacement sensors 8 and 9 detect the horizontal displacement (relative displacement with respect to the base bottom plate 1 and the core portion 2) of the bottom and top of the main body 3 at the time of an earthquake in real time, and the detection result is a control device (not shown). Based on this, the control device performs control so as to optimally adjust the rigidity of the predetermined intermediate part vibration control device 7, thereby effectively suppressing the shaking of the main body 3 at the time of the earthquake. At the same time, the swaying is quickly converged.
Specifically, a mathematical model of seismic ground motion of the entire building is input in advance to the above-described control device, and according to the direction and intensity of shaking of the main body 3 detected by input signals from the displacement sensors 8 and 9. By calculating the vibration status of the entire main body 3 every moment and outputting a control signal to each intermediate vibration control device 7 based on it, the displacement of each intermediate vibration control device 7 can be detected. Each rigidity is optimally adjusted so as to generate an optimal frictional force and reaction force in the opposite direction, and thus the vibration of the entire main body 3 is most effectively suppressed.
Thus, for example, when a large displacement occurs in the intermediate vibration control device 7 due to the occurrence of a huge earthquake, the rigidity of each intermediate vibration control device 7 is reduced and they are operated reliably to sufficiently absorb vibration energy. When the vibration reaches the convergence stage, the vibration of the main body 3 is quickly reduced by controlling the rigidity of the predetermined intermediate vibration control device 7 stepwise to restrain the displacement of the main body 3. It is possible to prevent long-lasting shaking from continuing for a long time.

According to the seismic isolation structure of the present embodiment described above, the main body 3 is basically supported by the bottom seismic isolation device 5 as in the normal seismic isolation structure. Excellent seismic isolation effect for 3 is obtained.
Moreover, it is a structure which presses down the main-body part 3 also from the top by supporting the top part of the main-body part 3 from the top part of the core part 2 constructed | assembled independently from the main-body part 3 via the top-part seismic isolation device 6. Furthermore, since the intermediate part of the main body part 3 can also be supported by the core part 2 via the multistage intermediate part damping device 7 (variable rigidity damper), the overturning moment acting on both the main body part 3 and the core part 2 is They are transmitted to each other via the bottom seismic isolation device 5, the top seismic isolation device 6, and the middle seismic isolation device 7, and they support each other so that they are not easily overturned. Therefore, it is possible to omit or reduce the pull-out strength against the bottom seismic isolation device 5 and the fail-safe mechanism for preventing overturning.

In addition, the main body part 3 generates relative vibration in the horizontal direction with respect to the core part 2 within the clearance 4, but the intermediate part vibration control device 7 is activated by the relative vibration to efficiently absorb the earthquake energy, The seismic input to the main body 3 is reduced, and an excellent seismic control effect is obtained.
In this case, since the middle part damping device 7 is concentrated and installed in the range of the middle floor where the interlaminar shear deformation angle is large, the middle part damping device 7 is compared with the case where the middle part damping device 7 is installed on the lower floor or the upper floor. Therefore, the seismic energy can be sufficiently absorbed, and as a result, the required cross section of the housing can be sufficiently reduced by minimizing the seismic force on the main body 3.
In addition, by using a variable stiffness damper as the intermediate vibration control device 7, the displacement of the main body 3 is optimally controlled every moment according to the vibration state of the main body 3 detected by the displacement sensors 8 and 9. Can be sufficiently suppressed, and the after shaking can be quickly converged.

  In addition, it is assumed that bending deformation that causes the core portion 2 to vibrate like an inverted pendulum occurs during an earthquake, but such bending deformation of the core portion 2 is caused from the main body portion 3 via the top seismic isolation device 6. It is sufficiently restrained by receiving the reaction force in the vertical direction.

2 to 5 show specific design examples of buildings by the seismic isolation structure of the present invention.
The main body 3 is composed of a double tube frame in which an outer tube frame 10 and an inner tube frame 11 are connected by a connecting beam 12 on each floor, and a corridor 13 is provided over the entire circumference inside the inner tube frame 11. A clearance 4 is secured between the core portion 2 and the inside.
The core portion 2 is composed of a high-rigidity core wall or truss structure, and is a high-rigidity large-section hat truss that projects a top structure 2a provided integrally at the top of the core portion 3 above the body portion 3. .

Then, as shown in FIG. 3, the base part 3 is installed between the bottom part of the main body part 3 (the bottom part of the outer tube structure 10 and the inner tube structure 11) and the base bottom plate 1 with the bottom seismic isolation device 5 interposed therebetween. As shown in FIG. 4, the structure is supported between the top of the main body 3 (the top of the outer peripheral tube frame 10 and the inner peripheral tube frame 11) and the top structure 2 a of the core 2. The body 6 is interposed.
In addition, variable stiffness dampers as intermediate part damping devices 7 are installed in the middle part of the main body part 3 every plurality of floors (every fifth floor in the illustrated example). As shown in FIG. 5 (b), two intermediate vibration control devices 7 are provided so as to face two horizontal directions with respect to each of the four corners of the inner peripheral tube frame 11 and the core portion 2 (therefore, 8 in each stage). One by one).
Further, as shown in FIG. 2, a displacement sensor 8 is installed between the bottom of the main body 3 and the base bottom 1, and the displacement is between the top of the main body 3 and the top structure 2 a of the core 2. A sensor 9 is installed.

  FIG. 6 shows another design example. This is to reduce the length of the top structure 2a of the core portion 2 projecting upward from the main body 3 and install the top seismic isolation device 6 only between the top portion of the inner peripheral tube frame 11 and displace it there. A sensor 9 is installed. In this case, the main body part 3 is supported from above by a smaller number of the top seismic isolation devices 6 than in the case of the above design example, but an equivalent effect can be obtained by appropriately setting the specifications of the top seismic isolation device 6. It is done.

  FIG. 7 shows still another design example. This is because the core part 2 does not reach the top of the building but the upper part is a void space 16, and the installation table 17 provided on the top of the core part 2 and the four corners inside the inner peripheral tube frame 11 are provided. The top seismic isolation device 6 is interposed between the overhanging installation base 18 and the displacement sensor 9 is installed there. This also provides the same effect.

  The present invention is not limited to the form of basic seismic isolation as in each of the above design examples, but as shown in FIG. 8, the main body 3 in each of the above design examples is installed on a low-rise building 20 and an intermediate floor is installed. It is also possible to use a form of seismic isolation.

1 Foundation floor (foundation structure)
DESCRIPTION OF SYMBOLS 1a Pile 2 Core part 2a Top structure 3 Main part 4 Clearance 5 Bottom seismic isolation device 6 Top seismic isolation device 7 Middle part damping device (variable rigidity damper)
8, 9 Displacement sensor 10 Outer tube structure 11 Inner tube structure 12 Connecting beam 13 Corridor 16 Void space 17, 18 Installation base 20 Low-rise building

Claims (1)

A seismic isolation structure for high-rise or super-high-rise buildings,
The building is composed of a tube-shaped main body portion in a plan view and a core portion that is constructed at the center of the main body portion independently of the main body portion, and the horizontal relative vibration is generated between the main body portion and the core portion. Ensure clearance to allow,
The main body is installed on the foundation structure with seismic isolation support by a bottom seismic isolation device,
The core part is relatively rigid than the main body part and is rigidly connected to the foundation structure and installed in a self-supporting state, and a top seismic isolation device is interposed between the top part of the core part and the main body part. Dress
Between the intermediate portion in the height direction of the main body portion and the core portion, a variable rigidity damper as an intermediate portion damping device is interposed in multiple stages at intervals in the vertical direction,
Displacement sensors that detect relative displacement in the horizontal direction generated between the bottom portion of the main body portion and the foundation structure and between the top portion of the main body portion and the core portion, respectively, A seismic isolation structure characterized in that the rigidity of the variable stiffness damper as the intermediate part damping device can be controlled based on the detection result of the displacement sensor.

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