JP2010112013A - Vibration control building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further efficiently obtain a damping effect in a vibration control building using multi-span damping. <P>SOLUTION: In the vibration control building 10 including an internal building 30 composed of a multistoried building; an external building 20 constructed to surround the internal building 30 and lower in rigidity than the internal building 30; and a vibration control damper 40 provided to connect the internal building 30 to the external building 20, a base isolation layer 21 is provided in a lower part of the external building 20. According to this, compared with a case having no base isolation layer 21, the valid mass of the external building 20 is increased, the frequency that becomes a peak of frequency transmission function is reduced, and the transmission rate at a fixed point P in fixed-point theory is also reduced. Therefore, the attenuation constant of the vibration control damper 40 is adjusted so as to be peaked at the fixed point P, whereby the transmission rate of the external building 20 is reduced, or the higher damping effect can be obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a damping building in which buildings having different rigidity are connected by a damping damper.

  Conventionally, a low-stiffness external building has been constructed so as to surround a high-rigidity internal building, and a multi-layered vibration control structure (hereinafter referred to as multi-building vibration control) is established between these buildings. It is used. According to the continuous building vibration control, the internal building and the external building vibrate in different deformation modes at the time of an earthquake, so that vibration energy can be efficiently absorbed by the vibration damper.

Further, for example, Patent Document 1 describes that in a building using multi-building vibration control, a seismic isolation layer is provided in the lower part of the internal building and the external building.
JP 2006-45933 A

  Here, fixed point theory is widely used as a method of designing a vibration damper in a vibration-damped building using continuous building vibration control. FIG. 4A is a graph showing the frequency transfer function in each building when the base isolation layer is not provided, and FIG. 4B is a graph showing the frequency transfer function when the base isolation layer is provided in each building. It is. The fixed point theory is a theory that the frequency transfer function of each building always passes through fixed points on the graph (points P and Q in FIG. 4A) regardless of the damping coefficient of the damping damper. This fixed point is when the damping force of the damping damper connecting these buildings is 0 (that is, they can vibrate independently from each other) and infinite (that is, the two structures are integrated) This is the intersection of the frequency transfer functions of each building. When designing the damping damper using the fixed point theory, the damping constant of the damping damper is adjusted so that the peak of the frequency transfer function matches this fixed point.

Here, when considering the frequency transfer function of a building that combines the building vibration control described in Patent Document 1 and the seismic isolation structure, by providing a seismic isolation layer at the bottom of each building, Since the effective mass for the mode increases, as shown in FIG. 4B, the peak of the frequency transfer function of the high-rigidity and low-rigidity building is on the low-frequency side compared to the case where no seismic isolation structure is provided. Will move. However, as shown in the figure, even if the frequency transfer functions of the high-rigidity and low-rigidity buildings are moved to the low-frequency side, the transfer rates of the fixed points P and Q remain substantially constant. For this reason, as a result, as shown in FIG. 4B, the peak value of the frequency transfer function cannot be suppressed, and it cannot be said that a significant vibration damping effect is obtained compared to the conventional case.
The present invention has been made in view of the above problems, and an object of the present invention is to obtain a higher vibration damping effect in a vibration-damped building using continuous building vibration damping.

  The vibration-damping building of the present invention includes a high-rigidity structure, a low-rigidity structure having a rigidity lower than that of the high-rigidity structure, and a plurality of the high-rigidity structure and the low-rigidity structure. A plurality of vibration dampers, which are configured to prevent any relative displacement in a horizontal direction generated between the high-rigidity structure and the low-rigidity structure. The vibration energy is absorbed by being deformed according to the relative displacement, and the low-rigidity structure is provided with a seismic isolation layer in the lower part.

  In the above vibration-damping building, the low-rigidity structure may be constructed so as to surround the entire circumference of the high-rigidity structure in plan view.

  According to the present invention, since the effective mass of the low-rigidity building is increased by providing the seismic isolation layer at the lower part of the low-rigidity building, the peak frequency in the frequency transfer function changes to the low-frequency side. As a result, the fixed point in the fixed point theory moves to the low frequency side, and the transmission rate at this fixed point decreases. For this reason, by determining the damping constant of the damping damper so that the peak of the frequency transfer function is located at a fixed point, the transmission rate of the external building can be reduced, and a more efficient damping effect can be obtained.

Hereinafter, an embodiment of a vibration damping structure of the present invention will be described with reference to the drawings.
FIG. 1A is a vertical cross-sectional view showing the configuration of the vibration-damping building 10 of this embodiment, and FIG. 1B is a horizontal cross-sectional view at a height where the vibration damper 40 in FIG. . As shown in FIG. 1A, the vibration-damping building 10 of the present embodiment includes an external building 20 having a void space 22 extending in the vertical direction therein, and an internal building constructed in the void space 22 of the external building 20. 30 and a vibration damper 40 that connects the external building 20 and the internal building 30 at a plurality of height positions.

  The external building 20 is a super high-rise building constructed in a rectangular horizontal section, and has a void space 22 extending in the vertical direction therein. As the external building 20, for example, a steel structure, a reinforced concrete structure, a steel reinforced concrete structure, or the like can be adopted. The external building 20 includes a base isolation layer 21 made of, for example, a laminated rubber or a sliding bearing at the lowermost part. Thereby, the effective mass of the external building 20 becomes large compared with the case where the seismic isolation layer 21 is not provided.

  The internal building 30 is a high-rise building constructed in a rectangular horizontal cross section, and, like the external building 20, for example, a steel structure, a reinforced concrete structure, a steel reinforced concrete structure, or the like can be adopted. The internal building 30 is constructed so as to have higher rigidity than the external building 20. Thus, the natural period of the internal building 30 is shortened due to high rigidity, and the natural period of the external building 20 is long due to low rigidity. For this reason, when an external force such as an earthquake acts on the vibration control building 10, the internal building 30 and the external building 20 vibrate in different vibration modes.

  As the damping damper 40, a hydraulic damper, a steel damper, a friction damper, or the like can be used, and the vibration energy is absorbed by being deformed in accordance with the relative deformation of the internal building 30 and the external building 20. In the example shown in FIG. 1B, the vibration damper 40 extends in four directions substantially perpendicularly from the outer peripheral surfaces of the internal building 30 and is connected to the opposing position of the void space 22 of the external building 20. The connection method of the damping damper 40 is not limited to this, and any damping damper 40 may be deformed with respect to the relative displacement in any direction of the external building 20 and the internal building 30. That's fine.

  FIG. 2A is a graph showing an example of the frequency transfer function of the internal building 30 and the external building 20 when the seismic isolation layer 21 is not provided in the external building 20, and FIG. 4 is a graph showing an example of a frequency transfer function of the internal building 30 and the external building 20 in the vibration control building 10. As shown in the figure, the external building 20 is provided with the seismic isolation layer 21, whereby the peak of the frequency response function moves to the long period (low frequency) side. For this reason, as shown in the figure, a predetermined point in the fixed point theory, that is, the case where the damping force of the damping damper connecting two structures is set to 0 (that is, the vibrations can be independently vibrated) and infinite The intersection P of the frequency transfer function of the external building 20 in the case of large (that is, two structures are integrated) moves to the long period (low frequency) side, and the transfer rate is also reduced. When the damping damper 40 is designed using the fixed point theory, the damping constant of the damping damper 40 is determined so that the peak of the frequency transfer function of the external building 20 is located at this intersection on the graph. As described above, since the transmission rate of the fixed point P is reduced, as a result, the transmission rate of the entire frequency transfer function of the external building 20 can be reduced.

  As described above, according to the present embodiment, the effective mass of the external building 20 is increased by providing the seismic isolation layer 21 at the lower part of the external building 20, so that the peak of the frequency transfer function changes to the low frequency side. To do. As a result, the fixed point P in the fixed point theory moves to the low frequency side, and the transmission rate at the fixed point P also decreases. For this reason, by determining the damping constant of the damping damper 40 so that the peak of the frequency transfer function is located at the fixed point P on the graph, the transfer rate of the frequency transfer function of the external building 20 is reduced in the entire frequency band. Therefore, a higher damping effect can be obtained.

  In general, in a high-rise building with a base isolation layer, a damping damper is installed only to connect the ground and the part directly above the base isolation layer, and vibrations on the lower floors are absorbed by this damping damper. Although it is possible, large vibrations will occur in the upper floors due to the effects of higher modes. On the other hand, according to the present embodiment, since the vibration damper 40 is installed so as to connect the external building 20 and the internal building 30 from the lower layer to the upper layer, the shaking of the upper floor of the external building 20 is suppressed. Can do.

  In addition, although this embodiment demonstrated the case where this invention was applied to the damping building where the low-rigidity external building 20 was constructed so as to surround the entire circumference of the high-rigidity internal building 30 and the internal building 30, Not limited to this, as shown in FIG. 3A, a high-rigidity building 130, and a low-rigidity building 120 constructed in a U shape in plan view so as to surround the periphery of the high-rigidity building 130, Even in the damping building 110 including the damping damper 40 connecting the buildings 120 and 130, the same effect as that of the present embodiment can be obtained by providing a seismic isolation layer in the lower portion of the low-rigidity building 120.

  Furthermore, as shown in FIG. 5B, the high-rigidity building 230, the low-rigidity building 220 constructed in a U shape in plan view so as to surround the periphery of the high-rigidity building 230, and these The present invention can also be applied to a vibration control building 210 including a vibration control damper 40 that connects the buildings 220 and 230. Note that the vibration dampers 40 in these vibration-damping buildings 110 and 210 need to be arranged so as to be able to absorb the deformation energy with respect to relative displacement in any horizontal direction generated between these buildings.

  Moreover, in this embodiment, although the seismic isolation layer 21 is provided in the lowest part of the external building 20, it is not restricted to this, The height position which provides the seismic isolation layer 21 will not be ask | required if it is the lower part of the external building 20.

(A) is a vertical cross-sectional view showing the configuration of the vibration-damping building of the present embodiment, and (B) is a horizontal cross-sectional view at a height at which the vibration-damping damper in (A) is attached. (A) is a graph which shows an example of the frequency transfer function of an internal building and an external building when the seismic isolation layer is not provided in the external building, (B) is an internal building in the damping building of this embodiment. It is a graph which shows an example of the frequency transfer function of an external building. (A) shows a vibration-damping building when a low-rigidity building is configured in a U shape in plan view, and (B) shows a vibration-damping building in a case where the low-rigidity building is configured in a U shape in plan view. (A) is a graph showing a frequency transfer function in a multi-story building with no seismic isolation layer, and (B) is provided with a seismic isolation layer for both a rigid structure and a low rigidity structure. It is a graph which shows the frequency transfer function in the case.

Explanation of symbols

10 Damping building 20 External building 21 Seismic isolation layer 22 Void space 30 Internal building 40 Damping damper

Claims (2)

A high-rigidity structure, a low-rigidity structure having lower rigidity than the high-rigidity structure, and a plurality of vibration dampers provided to connect the high-rigidity structure and the low-rigidity structure. A damping building,
The plurality of vibration damping dampers generate vibration energy by being deformed in accordance with the relative displacement in any horizontal relative displacement generated between the high-rigidity structure and the low-rigidity structure. Absorb,
The low-rigidity structure is provided with a seismic isolation layer at a lower portion thereof. A vibration-damping building according to claim 1,
The vibration-damping building, wherein the low-rigidity structure is constructed so as to surround the entire circumference of the high-rigidity structure in plan view.