JP2011220510A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device, capable of suppressing small vibration, and capable of damping vibration without causing breakage even if large vibration is generated.SOLUTION: The vibration control device includes: a first vibration damping unit which has a first mass body, is set so as to be synchronized with an inherent vibration frequency of a structure at which the first mass body is installed, and damps vibration input to the structure; and a second vibration damping unit which is arranged in parallel with the first vibration damping unit, and has a second mass body. When a relative movement of the first mass body with respect to the structure caused by the vibration becomes larger than a prescribed amount, the first vibration damping unit and the second vibration damping unit resonate with each other, and the synchronized frequency is changed.

Description

  The present invention relates to a vibration damping device that includes a mass body and suppresses vibration of a structure.

  Conventionally, as a damping device that includes a mass body and suppresses vibration of a structure, for example, a seismic isolation device in which a rooftop portion of a high-rise structure is configured by a movable support portion and a damping damper of a laminated rubber steel plate structure. A vibration-damping building supported in this manner is known (see Patent Document 1). In such a vibration-damping building, by adjusting the mass of the roof floor part, the roof floor part becomes a pendulum with a natural period close to the primary natural vibration period of the building. Is alleviated by

JP-A-4-285276

  However, the vibration input to the building may not only be a vibration having a large amplitude such as an earthquake, but may be a small vibration due to, for example, a wind. For this reason, for example, if vibration due to a large earthquake or the like is input to a building whose mass is adjusted on the rooftop so that the optimum vibration suppression effect is exhibited by small vibration such as wind, the vibration is further increased by resonance. Then, there is a problem that the seismic isolation device may be damaged.

  The present invention has been made in view of the conventional problems as described above, and provides a vibration damping device capable of suppressing small vibrations and damping vibrations without breaking even large vibrations. The purpose is to do.

In order to achieve this object, the vibration damping device of the present invention has a first mass body, is set in synchronization with the natural vibration frequency of the structure provided with the first mass body, and is input to the structure. A first damping unit for damping the generated vibration, and a second damping unit provided in parallel with the first damping unit and having a second mass body, and the structure against the structure due to the vibration When the relative movement amount of the first mass body is larger than a predetermined amount, the first vibration suppression unit and the second unit cooperate with each other, and the frequency to be tuned is changed. Device.
According to such a vibration damping device, since the first vibration damping unit is set in synchronization with the natural vibration frequency of the structure, it is possible to effectively reduce vibrations input to the structure. . In addition, when the relative movement amount of the first mass body with respect to the structure due to the input vibration becomes larger than a predetermined amount, the second damping unit having the second mass body provided in parallel with the first damping unit, The frequency to be tuned is changed in cooperation with one damping unit. That is, when the relative movement amount of the first mass body with respect to the structure becomes larger than a predetermined amount, the frequency at which the first vibration suppression unit and the second vibration suppression unit are synchronized deviates from the natural vibration frequency of the structure. For this reason, it is possible to keep the relative movement amount of the first mass body small.

In this vibration damping device, the first mass body is supported on the structure by an elastic support, and a sliding plate is provided between the elastic support and the structure. However, a sliding member is provided on the other side, and the static frictional force acting between the sliding plate and the sliding member causes the first mass body and the structure to move relative to each other and the elastic bearing member. It is desirable that the force be smaller than the force that causes relative movement to the destruction limit where it is destroyed.
According to such a vibration damping device, when a vibration in which a force greater than the static friction force acting between the sliding plate and the sliding material is input, the elastic force that supports the first mass body is input. The sliding material and the sliding plate slide between the bearing and the structure on which the elastic bearing is supported, so that excessive deformation that would cause the elastic bearing to reach the fracture limit is prevented. Is possible. Further, vibration energy is absorbed also by friction generated when sliding between the sliding material and the sliding plate, so that vibration can be more effectively suppressed.

In this vibration damping device, the second mass body is provided outside the first vibration damping unit, and is disposed on both sides at a distance from the first mass body in the horizontal direction. desirable.
According to such a vibration damping device, since the second mass body provided outside the first vibration damping unit is disposed on both sides at a distance from the first mass body in the horizontal direction, the first mass The elastic support body is deformed by the distance between the body and the second mass body, and the first mass body and the elastic support body are slid to obtain the damping effect of the first damping unit. Is possible. For this reason, it is possible to effectively dampen the structure by the damping action of the first damping unit alone until the first damping unit comes into contact with the second mass body. Then, after the first damping unit comes into contact with the second mass body, the first mass body and the second mass body are almost integrated and co-operate and move relative to each other. It is possible to suppress the maximum relative movement amount of the two mass bodies.

In this vibration damping device, it is desirable that a buffer material be provided between the first mass body and the second mass body.
According to such a vibration damping device, since the cushioning material is provided between the first mass body and the second mass body, the first mass body is largely moved relative to the second mass body when vibration is input. It is possible to suppress the impact even when it comes into contact.

In this vibration damping device, it is desirable that a horizontal damping device is provided between the first mass body, the second mass body, and the structure.
According to such a vibration damping device, when the relative movement amount due to the input vibration is equal to or less than a predetermined value, the damping device provided mainly between the first mass body and the structure is effectively used. It is possible to suppress vibration by acting. In addition, when the relative movement amount due to the input vibration is larger than a predetermined value, the vibration is suppressed by acting two damping devices provided between the first mass body and the second mass body and the structure. It is possible.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing a small vibration, it is possible to provide the damping device which can be damped without destroying with respect to a big vibration.

It is a front view which shows the structure of the damping device which concerns on one Embodiment of this invention. It is a figure for demonstrating the effect of the damping device which concerns on this embodiment.

  Hereinafter, an example of the vibration damping device of the present embodiment will be described in detail with reference to the drawings.

FIG. 1 is a front view showing a configuration of a vibration damping device according to an embodiment of the present invention.
The vibration damping device 10 of the present invention is provided, for example, on a roof portion of a high-rise building 1 as a structure.

  The vibration damping device 10 includes a first vibration damping unit 20 and a second vibration damping unit 30 arranged in parallel with the first vibration damping unit.

  The first damping unit 20 includes a first mass body 21, a first laminated rubber bearing 22 as an elastic bearing body that is fixed to the first mass body 21 and supports the first mass body 21, and a first laminated rubber bearing. A sliding member 23 fixed to the lower surface of the building 22, a sliding plate 24 fixed to the roof surface 1 a of the building 1, and a first damping device as a horizontal damping device interposed between the first mass body 21 and the building 1. 1 damper 25.

  The first mass body 21 is formed of, for example, a concrete block having a cubic shape.

  The first laminated rubber support 22 has a cylindrical shape and is fixed at four corners on the lower surface of the first mass body 21, and supports the first mass body 21 above the roof top surface 1a with a space from the roof top surface 1a. ing. The first laminated rubber bearing 22 also functions as a restoring member that restores the first mass body 21 that has moved relative to the building.

  On the lower surface of the first laminated rubber support 22, a sliding material 23 made of a stainless steel disk is provided. The diameter of the sliding material 23 is slightly larger than the diameter of the first laminated rubber support 22.

  Four first laminated rubber supports 22 provided on the lower surface of the first mass body 21 are placed on the sliding plate 24, and when the vibration is input to the building 1, the placed first laminated rubber supports 22 are placed. It is a stainless steel plate formed to have a size that does not fall off.

  Two first dampers 25 are arranged along two orthogonal directions in the horizontal plane, and have a function of attenuating vibration by acting when the first mass body 21 moves relative to the building 1. is doing. In FIG. 1, one of the two first dampers 25 is omitted.

  In the first vibration damping unit 20, the mass of the first mass body 21 and the spring constant of the first laminated rubber bearing 22 are set so as to synchronize with the first vibration mode of the natural vibration frequency of the building 1. Further, when the building 1 and the first mass body 21 move relative to each other in the horizontal direction, the sliding material 23 and the sliding plate 24 before the relative movement amount reaches the breaking limit of the first laminated rubber bearing 22, The friction coefficient between the sliding material 23 and the sliding plate 24 is set so that the sliding material 23 and the sliding plate 24 start to slide.

  The second vibration control unit 30 is provided between the second mass body 31 and the building 1 so as to support the second mass body 31 and the second mass body 31 provided so as to surround the first mass body 21. It has the 2nd laminated rubber bearing 32 as a support body, and the 2nd damper 33 as a horizontal direction damping device interposed between the 2nd mass body 31 and the building 1.

  The second mass body 31 is formed of a concrete block having a rectangular hole 31a larger than the outer diameter of the first mass body 21 in the center in a plan view and having an outer shape of a rectangular shape. . And the 1st mass body 21 of the 1st damping unit 20 is arranged in the approximate center of hole 31a of the 2nd mass body 31. At this time, the four surfaces located on the outer periphery of the first mass body 21 are arranged to be opposed to the four surfaces forming the inner peripheral surface 31b of the second mass body 31 and spaced from each other. Further, the inner peripheral surface 31b is provided with a cushioning material 31c such as rubber on each of two pairs of opposed surfaces facing each other.

  The second laminated rubber support 32 is configured by connecting two laminated rubbers 32a having a columnar shape in the vertical direction via a steel plate 32b. The second laminated rubber support 32 has an upper end fixed at four corners on the lower surface of the second mass body 31 and a lower end fixed to the rooftop surface 1a, and the second mass body 31 is placed above the rooftop surface 1a and the rooftop surface 1a. And is spaced apart. The second laminated rubber support 32 also functions as a restoring member that restores the second mass body 31 that has moved relatively.

  Two second dampers 33 are also arranged along two directions orthogonal to each other in a horizontal plane, and have a function of attenuating vibration by acting when the second mass body 31 moves relative to the building 1. is doing. In FIG. 1, one of the two second dampers 33 is omitted. Here, examples of the first damper 25 and the second damper 33 include an oil damper, a viscous damper, a viscoelastic damper, a friction damper, and a steel history damper.

  In the second vibration control unit 20, the mass of the second mass body 31 and the spring constant of the second laminated rubber bearing 32 are set so as not to synchronize with the first vibration mode of the natural vibration frequency of the building 1.

  FIG. 2 is a diagram for explaining the effect of the vibration damping device according to the present embodiment.

  When the first mass body 21 and the second mass body 31 are brought into contact with each other and move almost integrally, the first damping unit 20 and the second damping unit 30 are shown in FIG. The frequency to be tuned is changed so as to tune in the region between the first vibration mode and the second vibration mode (region A in FIG. 2), which is the natural vibration frequency.

  At this time, the horizontal stiffness per unit mass of the first laminated rubber bearing 22 and the second laminated rubber bearing 32 is set so that the second laminated rubber bearing 32 is larger than the first laminated rubber bearing 22. Here, the horizontal stiffness per unit mass means a value obtained by dividing the horizontal stiffness of the first laminated rubber bearing 22 by the mass of the first mass body 21, and the horizontal stiffness of the second laminated rubber bearing 32 as the second mass body. The value divided by the mass of 31. The damping ratio per unit mass rigidity of the first damper 25 and the second damper 33 is set so that the second damper 33 is larger than the first damper 25. Here, the damping ratio per unit mass stiffness is a value obtained by dividing the damping coefficient of the first damper 25 by the product of the mass of the first mass body 21 and the stiffness, and the damping coefficient of the second damper 33 is the second mass. It is a value divided by the product of the mass and rigidity of the body 31.

  In the vibration damping device 10, when vibration is input to the building 1, the first mass body 21 of the first vibration damping unit 20 and the second mass body 31 of the second vibration damping unit 30 are relative to the building 1. Start moving. At this time, since the first damping unit 20 is set so that the first mass body 21 vibrates in synchronization with the natural vibration frequency of the building 1, the relative movement amount of the first mass body 21 is It becomes larger than the relative movement amount of the second mass body 31.

  At this time, when the input vibration is slight vibration due to, for example, wind, the first mass body 21 and the second mass body 31 are relatively moved independently of each other, and the first mass body 21 and the second mass body 31 are moved in accordance with the relative movement. The first damper 25 and the second damper 33 act to attenuate the vibration. At this time, the sliding member 23 and the sliding plate 24 are stationary on the sliding plate 24 without sliding due to friction acting between them.

  Even when the input vibration is, for example, a strong wind vibration or a small earthquake, the first mass body 21 and the second mass body 31 move independently of each other, but the first mass body 21 When the relative movement amount of the first mass body 21 exceeds the set value, the sliding material 23 and the sliding plate 24 start to slide, and the relative movement amount of the first mass body 21 with respect to the building 1 increases. The amount of deformation of the first laminated rubber bearing 22 is reduced by the restoring force. At this time, the vibration energy is absorbed by the friction generated by the sliding of the sliding member 23 and the sliding plate 24, and the vibration is attenuated. Further, when the first mass body 21 moves relative to the building 1, the first damper 25 and the second damper interposed between the first mass body 21 and the second mass body 31 and the building 1. The damper 33 also acts to absorb vibration energy and attenuate the vibration.

  When the vibration is larger, the relative movement amount of the first mass body 21 is further increased. And after the 1st mass body 21 contacts the 2nd mass body 31, the 1st mass body 21 and the 2nd mass body 31 begin to move relatively as a unit. At this time, the first mass body 21 that has moved relative to the natural vibration frequency of the building 1 together with the second mass body 31 is a region between the first vibration mode and the second vibration mode (A in FIG. 2). In this region, the relative movement amount of the first mass body can be kept small. Also at this time, when the first mass body 21 is moving relative to the building 1, the first damper 25 and the first damper 25 interposed between the first mass body 21 and the second mass body 31 and the building 1 and The second damper 33 acts to absorb vibration energy and attenuate the vibration.

  According to the vibration damping device 10 of the present embodiment, since the first vibration damping unit 20 is set in synchronization with the natural frequency of the building 1, it is possible to effectively reduce vibrations input to the building 1. It is. When the relative movement amount of the first mass body 21 with respect to the building 1 due to the input vibration becomes larger than a predetermined amount, that is, after the first mass body 21 comes into contact with the second mass body 31, the first vibration suppression is performed. The second vibration control unit 30 having the second mass body 31 provided in parallel with the unit 20 and the first vibration control unit 20 co-operate to change the frequency to be tuned. That is, when the relative movement amount of the first mass body 21 with respect to the building 1 becomes larger than a predetermined amount, the frequency at which the first damping unit 20 and the second damping unit 30 are tuned is changed from the first vibration mode of the natural frequency of the building 1 Come off. Here, the predetermined relative movement amount is a movement amount in which the first mass body 21 and the second mass body 31 are in contact with each other, and can be adjusted by an interval between the first mass body 21 and the second mass body 31. It is.

  In addition, when a vibration in which a force larger than the static friction force between the sliding material 23 and the sliding plate 24 is input, the first laminated rubber support 22 on which the first mass body 21 is supported, and the first laminated rubber Since the sliding material 23 and the sliding plate 24 slide between the building 1 on which the support 22 is supported, the sliding material 23 is moved while the relative movement amount of the first mass body 21 with respect to the building 1 is not more than a predetermined amount. And the sliding plate 24 can be slid. For this reason, it is possible to prevent a great load from acting on the first laminated rubber bearing 22.

  At this time, the sliding member 23 and the sliding plate 24 start to slide before reaching the breaking limit where the first mass body 21 and the building 1 are relatively moved and the first laminated rubber bearing 22 is broken. It is possible to prevent the laminated rubber support 22 from being broken. At this time, vibration energy is also absorbed by friction generated when sliding between the sliding member 23 and the sliding plate 24, so that vibration can be more effectively suppressed.

  In addition, the second mass body 31 is provided outside the first vibration damping unit 20 and is provided at a distance from the first mass body 21 in the horizontal direction. The second mass body 31 is disposed in the horizontal direction. Are disposed on both sides of the first mass body 1, the first laminated rubber support 22 is deformed only by the distance between the first mass body 21 and the second mass body 31, and the first mass body It is possible to obtain the damping effect of the first damping unit 20 by sliding between the sliding member 23 provided with 21 and the first laminated rubber support 22 and the sliding plate 24. For this reason, it is possible to effectively dampen the building 1 until the first damping unit 20 comes into contact with the second mass body 31.

  And after the 1st mass body 21 contacts the 2nd mass body 31, since the 1st mass body 21 and the 2nd mass body 31 are united together and move together relatively, the 1st mass with respect to the building 1 The relative movement amount of the body 21 can be suppressed.

  In addition, since the buffer material 31 c is provided between the first mass body 21 and the second mass body 31, vibration is input so that the first mass body 21 is relatively moved and contacts the second mass body 31. Even in this case, the impact can be suppressed.

  Furthermore, between the first mass body 21 and the second mass body 31 and the building 1, the first damper 25 and the second damper 33 that attenuate the vibration in the horizontal direction are provided. In the case of being small, it is possible to effectively suppress the vibration by causing the first damper 25 to act effectively by the first damper 25 provided mainly between the first mass body 21 and the building 1. Moreover, when the input vibration is large, the first mass body 21 and the second mass body 31 and the building are suppressed while keeping the relative movement amount between the first mass body 21 and the second mass body 31 and the building 1 small. It is possible to suppress vibration by acting the first damper 25 and the second damper 33 provided between the first damper 25 and the second damper 33.

  In the said embodiment, the damping device 10 which had the cube-shaped 1st mass body 21 and the rectangular-shaped 2nd mass body 31 provided so that the 1st cube might be enclosed and having the rectangular-shaped hole 31a was demonstrated. But this is not the case. For example, the first mass body may have a columnar shape, and a cylindrical second mass body may be provided outside the first mass body with an interval therebetween. Further, four second mass bodies having surfaces facing the four outer peripheral surfaces of the cubic or rectangular parallelepiped first mass body 21 are provided so as to oppose the respective outer peripheral surfaces of the first mass body 21. Also good.

  In the said embodiment, although the vibration control storage 10 demonstrated the example provided in the rooftop part of the building 1, it does not necessarily need to be on the rooftop.

  The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

1 building, 1a roof surface, 10 vibration control device, 20 first vibration control unit,
21 first mass body, 22 first laminated rubber bearing, 23 sliding material, 24 sliding plate,
25 1st damper, 30 2nd damping unit, 31 2nd mass body,
31a hole, 31b inner peripheral surface, 31c cushioning material, 32 second laminated rubber bearing,
32a Laminated rubber, 32b Steel plate, 33 Second damper

Claims (5)

A first damping unit that has a first mass body, is set in synchronization with a natural vibration frequency of a structure provided with the first mass body, and controls vibrations input to the structure;
A second damping unit provided in parallel with the first damping unit and having a second mass body;
Have
When the relative movement amount of the first mass body with respect to the structure due to the vibration becomes larger than a predetermined amount, the first damping unit and the second unit co-operate and the frequency to be tuned is changed. A vibration damping device characterized by that. The vibration damping device according to claim 1,
The first mass body is supported on the structure by an elastic support,
Between the elastic support body and the structure, a sliding plate is provided on either side, and a sliding material is provided on the other side,
The static friction force acting between the sliding plate and the sliding material is
The vibration damping device according to claim 1, wherein the first mass body and the structure are smaller in force than a force that causes a relative movement to reach a fracture limit where the elastic support body is broken by relative movement. The vibration damping device according to claim 1 or 2,
The second mass body is provided outside the first damping unit,
A vibration damping device, wherein the vibration damping device is disposed on both sides of the first mass body in a horizontal direction with a gap therebetween. A vibration damping device according to any one of claims 1 to 3,
A vibration damping device, wherein a buffer material is provided between the first mass body and the second mass body. A vibration damping device according to any one of claims 1 to 4,
A damping device in which a horizontal damping device is provided between the first mass body, the second mass body, and the structure.

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