JP6384174B2 - Vibration control structure - Google Patents

Description

  The present invention relates to a vibration damping structure.

  There is known a TMD (Tuned Mass Damper) type damping structure that is provided with a mass body and a restoration mechanism on a structure to be damped so as to dampen the vibration of the structure (see, for example, Patent Document 1). ). In the damping structure of Patent Document 1, laminated rubber is used as a restoring mechanism. When the structure and the mass body are relatively displaced in the horizontal direction due to an earthquake or the like, the relative positional relationship between the structure and the mass body is restored by the laminated rubber.

JP 11-294522 A

  To make TMD effective in the event of a large earthquake, it is necessary to move the mass body greatly.

  However, in the structure as described above, when the relative displacement is increased, the laminated rubber may be buckled, and thus the mass body may be dropped. In other words, there was a problem with safety.

  The present invention has been made in view of such a problem, and a main object of the present invention is to provide a vibration damping structure that can follow large deformation and can improve safety when excessive deformation occurs. There is.

In order to achieve such an object, the vibration damping structure of the present invention includes a structure to be damped, a mass body provided above the structure, the mass body, and the structure and mass. A laminated rubber that restores a relative positional relationship with the body, and controls vibration of the structure, wherein the laminated rubber is interposed between the mass body and the structure. An intervening first part, a first part having a first distance between the structure and a second part having a second distance that is less than the first distance from the structure. And when the mass body and the structure are relatively displaced in the horizontal direction, the laminated rubber undergoes shear deformation in the horizontal direction, so that the mass body is in the lower side in the vertical direction with respect to the structure. When the second distance is moved, the second portion of the mass body comes into contact with the structure. To the second portion in the portion which surrounds the periphery of said first portion, said provided so as to extend below the lower surface of the first portion, said second portion, said structure and those The lower end is provided with a supporting member for being supported by the structure by sliding support .
According to such a vibration damping structure, even when the relative displacement between the structure and the mass body is large, buckling of the laminated rubber can be prevented, and thus safety can be improved.
Further, the buckling of the laminated rubber can be prevented regardless of the direction of shaking.
Moreover, the stability when the second portion of the mass body comes into contact with the structure can be improved.
Further, in this vibration damping structure, it is preferable that the support member is a Teflon sliding material having a low friction coefficient.

In this vibration damping structure, an additional mass body is provided between the first portion and the structure, and the laminated rubber is between the structure and the additional mass body, and between the additional mass body and the structure. The gap in the horizontal direction between the second portion and the additional mass body in a state where there is no relative displacement in the horizontal direction between the structure and the mass body. When the relative displacement in the horizontal direction occurs between the structure and the mass body and the second portion of the mass body comes into contact with the structure, the second portion and the additional mass body do not contact each other. It is desirable that a gap be provided .
According to such a vibration damping structure, it becomes possible to follow a large deformation and to make the period longer.
Further, in this vibration damping structure, a notch is provided below and inside the second part to prevent the laminated rubber from interfering with the second part when the laminated rubber is deformed. It is desirable that

In this vibration damping structure, it is desirable that the mass of the additional mass body is 25% or less of the mass of the mass body.
According to such a vibration control structure, the vibration control performance can be improved.
It is desirable that the vibration control structure further includes a damping device that attenuates vibration between the structure and the first part.
According to such a vibration control structure, it is possible to effectively attenuate a large deformation.

In this vibration damping structure, it is desirable that a plurality of the laminated rubbers are provided on the same plane between the structure and the first part.
According to such a vibration damping structure, stability during deformation can be ensured.

In this vibration damping structure, it is desirable that the amount of deformation of the laminated rubber in the horizontal direction when the second portion of the mass body contacts the structure is equal to or less than the diameter of the laminated rubber.
According to such a vibration damping structure, buckling of the laminated rubber can be reliably prevented.

  According to the present invention, it is possible to follow a large deformation, and it is possible to improve safety when an excessive deformation occurs.

It is explanatory drawing of the TMD damping structure of a comparative example. It is explanatory drawing of the TMD damping structure of another comparative example. It is explanatory drawing of the TMD damping structure of this embodiment. FIG. 4 is a top view of FIG. 3. 5A to 5C are diagrams for explaining the operation of the TMD vibration control structure of the present embodiment.

=== Comparative Example ===
Before describing this embodiment, a TMD damping structure of a comparative example will be described. Note that the TMD damping structure is provided with a mass body, a restoration mechanism, and a damping mechanism on a structure to be damped so that the natural period of the vibration system corresponds to the natural period of the structure to be damped in advance. The vibration control structure is adjusted (tuned).

FIG. 1 is an explanatory diagram of a TMD damping structure of a comparative example.
As shown in the figure, the TMD damping structure of the comparative example includes a building 10, a weight 200, a laminated rubber 300, and a damper 400.

  The building 10 is a structure to be controlled, such as a high-rise building.

  The weight 200 is a large (for example, 500 tons) mass body for performing TMD vibration suppression, and is provided above the top of the building 10.

  The laminated rubber 300 has a well-known configuration, and is, for example, a cylindrical member in which a circular rubber layer and internal steel plates are alternately laminated and sandwiched between a pair of upper and lower flanges. The laminated rubber 300 is provided between the building 10 and the weight 200 and supports the weight 200. When the building 10 and the weight 200 are relatively displaced in the horizontal direction, the laminated rubber 300 is relative to the building 10 and the weight 200. Restore the positional relationship (restoration mechanism).

  The damper 400 is provided between two members (here, the building 10 and the weight 200), and absorbs vibration energy when the two members are relatively displaced to attenuate the vibration (attenuation mechanism). In addition, as the damper 400, the oil damper which attenuates a vibration using the oil which is a viscous fluid is used.

  In the TMD vibration control structure configured as described above, the vibration frequency of the vibration system (weight 200, laminated rubber 300, damper 400) is adjusted in advance so as to correspond to the natural period of the building 10 to be controlled (tuning). ) By doing so, even when the building 10 vibrates in the horizontal direction due to an earthquake or the like, the vibration can be suppressed.

  However, if the horizontal relative displacement between the building 10 and the weight 200 becomes too large, the laminated rubber 300 may be buckled, and in this case, the large (large) weight 200 may fall.

  FIG. 2 is an explanatory diagram of a TMD damping structure of another comparative example. In addition, the same code | symbol is attached | subjected to the part of the same structure as FIG. 1, and description is abbreviate | omitted.

  In this example, a laminated rubber 300 ′ having a diameter smaller than that of the laminated rubber 300 is provided in two layers. By reducing the diameter, the horizontal rigidity can be lowered, and synchronization with the building 10 is easier than in the example of FIG. Further, by superimposing two layers, it becomes easier to follow a large deformation than in the case of FIG. 1, and a longer period can be achieved. However, in this case, the risk of buckling of the laminated rubber 300 'becomes even greater than in the case of FIG.

  As described above, in the comparative example, when the horizontal relative displacement between the building 10 and the weight 200 increases, the laminated rubber 300 and the laminated rubber 300 ′ may buckle and the weight 200 may fall. Therefore, there is a problem with safety.

  Therefore, in the present embodiment described below, safety is improved by preventing buckling of the laminated rubber.

=== Embodiment ===
<<<< About the structure of TMD damping structure >>>>
FIG. 3 is an explanatory diagram of the TMD damping structure of the present embodiment. FIG. 4 is a top view of the TMD damping structure of FIG. 3 as viewed from above.

  The TMD vibration control structure of this embodiment includes a building 10, a weight 20, a connecting plate 28, a laminated rubber 30, and a damper 40.

  The building 10 is the same structure to be damped as in the comparative example (FIGS. 1 and 2). However, in the present embodiment, the sliding plate 12 is provided on the upper surface of the building 10. The sliding plate 12 is a plate-like member having a small surface friction coefficient (for example, made of stainless steel). As shown in FIG. 4, the support stabilizer 26 of the weight 20 (specifically, in the square-shaped weight 20). It is provided at a position facing the corner. In addition, although the sliding plate 12 of this embodiment is square shape as shown in FIG. 4, it is not restricted to this, Other shapes may be sufficient. For example, it may be circular.

  The weight 20 is a large (for example, 500 tons) mass body similar to the weight 200, and is provided above the top of the building 10. However, the weight 20 of the present embodiment has a horizontal portion 22 (corresponding to the first portion) and a leg portion 24 (corresponding to the second portion). The horizontal portion 22 is a portion where a laminated rubber 30 to be described later is interposed between the horizontal portion 22 and the distance from the building 10 is a distance H1 as shown in the figure. The leg portion 24 is provided along the outer periphery of the horizontal portion 22 and has a shape that protrudes downward from the lower surface of the horizontal portion 22 in the vertical direction. Further, a support stabilizer 26 (corresponding to a support member) is provided on the lower surface of the leg portion 24. In the present embodiment, a Teflon sliding material having a small friction coefficient (low friction coefficient) is used as the bearing stabilizer 26. Since the leg portion 24 is provided in this manner, the distance between the building 10 and the leg portion 24 of the mass body 20 (distance H2 in the figure) is much smaller than the distance H1. In addition, as shown in FIG. 4, the planar shape of the weight 20 (the horizontal part 22 and the leg part 24) of this embodiment is a square.

  The laminated rubber 30 is a cylindrical member having the same configuration as the laminated rubber 300. The laminated rubber 30 is provided between the horizontal portion 22 of the weight 20 and the building 10, supports the weight 20, and when the weight 20 and the building 10 are relatively displaced in the horizontal direction, the building 10 and the weight 20. To restore the relative positional relationship (recovery mechanism). In the present embodiment, the laminated rubber 30 is provided in two stages in the vertical direction, and a connecting plate 28 is provided therebetween. Here, in the following description, the lower side (between the building 10 and the connection plate 28) of the two-stage laminated rubber 30 is referred to as the lower stage, and the upper side (between the connection plate 28 and the weight 20). It is called the upper stage.

  The connecting plate 28 (corresponding to a connecting mass body) is provided between the upper and lower laminated rubber 30. The connection plate 28 of the present embodiment is a square plate member made of steel. As shown in FIGS. 3 and 4, four laminated rubbers 30 are disposed on the same horizontal plane on the building 10 and on the connecting plate 28. As described above, by arranging a plurality (four in this case) of the laminated rubber 30 on the same horizontal plane, the stability during deformation can be further ensured. Furthermore, in this embodiment, the laminated rubber 30 is stacked in two steps in the vertical direction (stacked). By doing so, it becomes possible to follow a large deformation and it can be made longer. The connecting plate 28 also functions as a weight of the TMD damping structure. The mass of the connecting plate 28 is preferably small, and is preferably 25% or less of the mass of the weight 20. Thereby, the damping performance of the damping structure having a two-stage configuration can be improved.

  The damper 40 is a damper (oil damper) having the same configuration as the damper 400 and is provided between the building 10 and the weight 20. In the present embodiment, similarly to the laminated rubber 30, the dampers 40 are provided in two stages (between the building 10 and the connecting plate 28, and between the connecting plate 28 and the weight 20). As shown in FIG. 4, the damper 40 is disposed along each side of the connecting plate 28 (between adjacent laminated rubbers 30). That is, four dampers 40 are provided on the upper and lower stages, respectively. By providing this damper 40, vibration can be suppressed more quickly.

<<<< Operation of TMD damping structure >>>>
Next, the operation of the TMD damping structure of this embodiment will be described.

  5A to 5C are explanatory diagrams illustrating the operation of the TMD vibration damping structure of the present embodiment.

  FIG. 5A shows a state where there is no relative displacement in the horizontal direction between the building 10 and the weight 20. That is, it is the same state as FIG. At this time, the interval between the horizontal portion 22 of the weight 20 and the building 10 is H1, and the interval between the leg portion 24 (more specifically, the bearing stabilizer 26) and the building 10 (more specifically, the sliding plate 12). Is the distance H2 (<distance H1).

  FIG. 5B shows a state in which the weight 20 is relatively displaced to the right in the horizontal direction with respect to the building 10 due to an earthquake or the like. Due to the relative displacement, the laminated rubber 30 is shear-deformed in both the upper and lower stages. Then, due to the shear deformation of the laminated rubber 30, the weight 20 moves downward in the vertical direction, and the distance between the support stabilizer 26 and the building 10 is smaller than that in FIG. 5A (distance H <b> 2). At this time, the connecting plate 28 is displaced to the right in the horizontal direction by about half of the displacement amount of the weight 20. That is, the deformation amount of the shear deformation of the laminated rubber 30 is substantially the same in the upper stage and the lower stage.

  5C, the weight 20 is further displaced relative to the building 10 on the right side in the horizontal direction from FIG. 5B. Here, the shear deformation of the laminated rubber 30 further increases, the weight 20 moves downward in the vertical direction, and the support stabilizer 26 of the weight 20 and the sliding plate 12 of the building 10 are in contact. That is, the weight 20 has moved the distance H2 downward from the state of FIG. 5A in the vertical direction. At this time (when the weight 20 comes into contact with the building 10), the amount of deformation (shear deformation amount) of the laminated rubber 30 in the horizontal direction is desirably set to be equal to or less than the diameter (diameter) of the laminated rubber 30. Thereby, buckling of the laminated rubber 30 can be reliably prevented. In the case of this example, when the weight 20 is relatively displaced with respect to the building 10 in the horizontal direction by twice the diameter of the laminated rubber 30 (a value obtained by combining the upper and lower deformation amounts), the support stabilizer 26 of the weight 20 and the building 10 will abut. By doing in this way, buckling of lamination rubber 30 can be prevented and safety can be improved.

=== Other Embodiments ===
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. In particular, the embodiments described below are also included in the present invention.

<About TMD structure>
In the above-described embodiment, the laminated rubber 30 has a two-stage configuration in which the laminated rubber 30 is laminated in two stages in the vertical direction, but is not limited thereto. For example, it may be one stage or three or more stages. In the case of three or more stages, if the leg 24 is provided on the uppermost weight and the weight and the building 10 are relatively displaced in the horizontal direction, the weight and the building 10 are brought into contact with each other. Good.

<About the weight 20>
In the above-described embodiment, the shape (planar shape) of the weight 20 is a square, but is not limited thereto. For example, the planar shape may be a rectangle, a polygon, or a circle. Further, in the above-described embodiment, the leg portions 24 are provided around the outer periphery of the horizontal portion 22. However, the present invention is not limited to this. It may be provided.

  In the above-described embodiment, the support stabilizer 26 (sliding material) is provided at the lower end of the leg portion 24 of the weight 20. And when the building 10 and the weight 20 contact | abutted, although the support structure of the sliding bearing was comprised by the bearing stabilizer 26 and the sliding board 12 of the building 10, it is not restricted to this. For example, it is good also as a support structure of a rolling support by providing a roller as the support stabilizer 26.

<About the connecting plate 28>
In the above-described embodiment, the shape of the connecting plate 28 is a square, but is not limited thereto, and may be, for example, a rectangle, a polygon, or a circle. Moreover, in the above-mentioned embodiment, although the connection board 28 was steel, it is not restricted to this, For example, a reinforced concrete etc. may be sufficient. In the above-described embodiment, the connecting plate 28 is a plate-like member. However, the connecting plate 28 is not limited to this, and may be a skeleton, for example.

<About laminated rubber 30>
In the above-described embodiment, four laminated rubbers 30 are arranged on the same plane and further arranged in two stages in the vertical direction, but this is not limited. For example, three or less, or five or more laminated rubbers 30 may be arranged on the same plane. Moreover, you may arrange | position to 1 step | paragraph (in this case, the connection board 28 is unnecessary) or 3 steps | paragraphs or more in a perpendicular direction.

<About damper 40>
In the above-described embodiment, the damper 40 uses oil to dampen vibration. However, the damper 40 is not limited to this and may be another damper (for example, a viscoelastic damper, a friction damper, or the like).

  Further, like the laminated rubber 30, the arrangement and number of the dampers 40 are not limited to the above-described embodiment.

DESCRIPTION OF SYMBOLS 10 Building 12 Sliding plate 20 Weight 22 Horizontal part 24 Leg part 26 Bearing stabilizer 30 Laminated rubber 40 Damper 200 Weight 300 Laminated rubber 300 'Laminated rubber

Claims (8)

A structure to be controlled, and
A mass provided above the structure;
A laminated rubber that supports the mass body and restores a relative positional relationship between the structure and the mass body;
A damping structure for damping the vibration of the structure,
The mass body is
A first part where the laminated rubber is interposed between the structure and a first part having a first distance between the structure and the structure;
A second portion having a second distance smaller than the first distance with respect to the structure;
Have
When the mass body and the structure are relatively displaced in the horizontal direction, the laminated rubber is shear-deformed in the horizontal direction, so that the mass body is vertically downward with respect to the structure. When the distance is moved, the second part of the mass body is brought into contact with the structure ,
The second part is provided so as to extend below the lower surface of the first part in a portion surrounding the periphery of the first part,
The vibration damping structure according to claim 1, wherein the second portion is provided with a support member at a lower end thereof so as to be supported by the structure by sliding support by contacting the structure. The vibration damping structure according to claim 1,
The vibration-damping structure , wherein the support member is a Teflon sliding material having a low coefficient of friction . The vibration damping structure according to claim 1 or 2,
An additional mass body is provided between the first portion and the structure,
The laminated rubber is provided between the structure and the additional mass body, and between the additional mass body and the mass body, respectively.
The gap in the horizontal direction between the second portion and the additional mass body in the state where there is no horizontal relative displacement between the structure and the mass body,
When a relative displacement in the horizontal direction occurs between the structure and the mass body and the second portion of the mass body comes into contact with the structure, the second portion and the additional mass body do not come into contact with each other. The vibration damping structure is characterized in that a space is provided in the space . A vibration damping structure according to claim 3,
Below and inside the second part,
A vibration damping structure, wherein a notch for preventing the laminated rubber from interfering with the second portion when the laminated rubber is deformed is provided . The vibration damping structure according to claim 3 or claim 4 ,
The mass of the additional mass body is 25% or less of the mass of the mass body. A vibration damping structure according to any one of claims 1 to 5 ,
A damping device that damps vibration between the structure and the first part;
Damping structure characterized by that. A vibration damping structure according to any one of claims 1 to 6 ,
A plurality of the laminated rubbers are provided on the same plane between the structure and the first part. A vibration damping structure according to any one of claims 1 to 7 ,
The damping structure according to claim 1, wherein a deformation amount of the laminated rubber in the horizontal direction when the second portion of the mass body contacts the structure is equal to or less than a diameter of the laminated rubber.