JP5406587B2 - Damping structure, building with damping structure - Google Patents

Description

  The present invention relates to a vibration control structure for a building and a building having the vibration control structure.

  Conventionally, a vibration control structure that reduces vibration of a building is known. For example, Patent Document 1 discloses a vibration damping structure in which a rigid body is arranged in a building and the rigid body and the foundation are connected by a damper member. This rigid body is supported by a sliding bearing, and its top is fixed to the roof (shed) of the building. In the event of an earthquake, the vibration of the roof is transmitted to the rigid body, the rigid body slides and the rigid body and the foundation are relatively displaced in the horizontal direction. The vibration is reduced by expanding and contracting the damper member using this relative displacement.

  However, in the vibration damping structure of Patent Document 1, since a frictional force is generated by the sliding movement of the rigid body, the relative displacement between the rigid body and the foundation becomes small, and the damper member cannot be efficiently expanded and contracted. Moreover, since the foundation which supports a rigid body becomes essential, cost increases.

  On the other hand, Patent Document 2 discloses a damping structure in which a rectangular frame fixed to a frame and a damping panel arranged in the rectangular frame are connected by an oil damper. The upper part of the damping panel is fixed to the upper frame member of the rectangular frame, and the lower part of the damping panel is a free end. The lower part of the vibration control panel and the left frame member of the square frame are connected by an oil damper. When an interlayer deformation occurs in the frame during an earthquake, the lower part (free end) of the damping panel is relatively displaced with respect to the left frame member of the rectangular frame. Using this relative displacement, the vibration is reduced by expanding and contracting the oil damper.

  However, in the vibration damping structure of Patent Document 2, it is assumed that a rectangular frame and a vibration damping panel are installed on the frame. Therefore, only a relative displacement corresponding to the interlayer deformation of one layer of the building can occur at most between the lower part of the vibration control panel and the left frame member, and a sufficient vibration control effect cannot be obtained depending on the building.

JP 2003-138383 A JP 2000-240321 A

  In view of the above facts, an object of the present invention is to improve vibration damping performance.

Damping structure according to claim 1 is disposed across the plurality of layers atrium space formed in a building, the oscillator whose lower end portion is a free end with its upper end portion is fixed to the building when a first connecting portion provided in the buildings surrounding the atrium, the provided on the side surface of the lower end of the oscillator, the first connection prior SL when an external force to the first connecting portion and the building acts And a second connecting part that is relatively displaced with respect to the part, and an attenuation means that is connected to the second connecting part.

According to said structure, the rocking | swiveling body is arrange | positioned ranging over multiple layers in the atrium space formed in the building . The upper end portion of the rocking body is fixed to the building, and the lower end portion is a free end. Therefore, when an external force acts on the building due to an earthquake, wind, etc., and the building is bent and deformed, the first connecting portion provided on the building surrounding the atrium space is provided on the side surface on the lower end side of the rocking body. The two connecting parts are relatively displaced. Thereby, force is transmitted to the damping means connected to the first connecting portion and the second connecting portion, and vibration energy is absorbed.

  Here, the relative displacement amount between the first connecting portion and the second connecting portion increases in accordance with the distance from the upper end of the swinging body fixed to the building to the second connecting portion. Is located across multiple layers of the building. Thereby, it becomes possible to provide a 2nd connection part in the position further separated from the upper end part of the rocking | swiveling body, ie, the relative displacement of a 1st connection part and a 2nd connection part can be enlarged. Therefore, it is possible to improve the vibration suppression reduction effect by the damping means.

In addition, the space in the building can be effectively used by installing the rocking body using the atrium space formed in the building.

Damping structure according to claim 2, in the damping structure according to claim 1, wherein the first connecting portion is positioned in the abdomen of the natural vibration modes of the building.

  According to said structure, the 1st connection part is located in the abdominal part of the natural vibration mode of a building, ie, the site | part of the building where interlayer deformation becomes relatively large. Therefore, the relative displacement of the second connecting portion with respect to the first connecting portion is increased, and the vibration reduction efficiency by the damping means can be improved.

A building according to a third aspect includes the vibration damping structure according to the first or second aspect , and includes an atrium space in which the rocking body is disposed.

According to said structure, the building has an atrium space. An oscillating body is disposed in the blow-off space. This rocking body is arranged over a plurality of layers of the building, its upper end is fixed to the building, and its lower end is a free end. Therefore, when an external force acts on the building due to an earthquake, wind, etc., and the building is bent and deformed, the first connecting portion provided on the building surrounding the atrium space is provided on the side surface on the lower end side of the rocking body. The two connecting parts are relatively displaced. Thereby, force is transmitted to the damping means connected to the first connecting portion and the second connecting portion, and vibration energy is absorbed. Therefore, it is possible to construct a building with improved vibration damping performance.

  Since the present invention has the above-described configuration, the vibration damping effect can be improved.

It is an elevational view showing a building to which a vibration damping structure according to an embodiment of the present invention is applied. It is an enlarged view of FIG. 1 which shows the attenuation means which concerns on embodiment of this invention. It is a schematic diagram which shows the deformation | transformation state of the building to which the damping structure which concerns on embodiment of this invention was applied. It is a schematic diagram which shows the deformation | transformation state of the building to which the damping structure concerning embodiment of this invention was applied, (A) shows the state before a deformation | transformation and (B) has shown the state after a deformation | transformation. It is a figure which shows the vibration model of a building, (A) shows a stationary state, (B) shows a secondary vibration mode, (C) is a figure which shows a tertiary vibration mode. It is an elevation view which shows the building to which the modification of the damping structure which concerns on embodiment of this invention was applied. It is a top view which shows a building.

  Hereinafter, a damping structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic elevation view showing a building 12 to which the vibration damping structure according to the present embodiment is applied.

  The building 12 includes a building body 13 and a rocking body 26 supported by the building body 13. The building body 13 includes an outer wall 14, a hat truss 16 and a truss beam 17 installed on the outer wall 14, and has a multilayer structure constructed such that a plurality of floors 18 overlap in the vertical direction. In the central portion of the building 12, an atrium space 20 extending to the truss beam 17 is formed in the vertical direction, and a floor 18 is constructed around the atrium space 20. A pillar 22 that supports the floor 18 is erected in the building body 13.

  The hat truss 16 is constructed at the top of the building 12, and has a highly rigid three-dimensional truss structure in which an upper chord member 16A, a lower chord member 16B, and a diagonal member 16C made of steel are connected. A truss beam 17 is constructed below the hat truss 16. The truss beam 17 has a highly rigid three-dimensional truss structure in which an upper chord member 17A, a lower chord member 17B, and a diagonal member 17C made of steel are connected, and is disposed substantially parallel to the hat truss 16. The hat truss 16 and the truss beam 17 are rigidly joined to the outer wall 14.

  A rocking body 26 that protrudes downward is provided at the central portion of the truss beam 17 in the material axis direction. The rocking body 26 is arranged across a plurality of layers (seven layers in FIG. 1) of the building 12. An upper end portion 26 </ b> A of the rocking body 26 is fixed to the truss beam 17 by rigid joining, and a lower end portion 26 </ b> B that is a free end is disposed in the blow-off space 20. The rocking body 26 has a three-dimensional truss structure constructed by connecting a string material 28A and a diagonal material 28B made of steel, and the rocking body 26 is relatively displaced with respect to the building body 13. In addition, it has sufficient rigidity to resist the reaction force received from the oil damper 30.

  As shown in FIGS. 1 and 2, the lower end side of the rocking body 26 and the building body 13 are connected by an oil damper 30 (attenuating means), and the building 12 is given attenuation. The oil dampers 30 are respectively disposed on both sides of the oscillating body 26 in the horizontal direction. Each oil damper 30 includes a connecting portion 32 (second connecting portion) provided on the lower end side of the rocking body 26 and a connecting portion 34 (first connecting portion) provided on the pillar 22 of the building body 13. It is connected so that it can expand and contract in the horizontal direction (A direction). The oil damper 30 includes a cylinder 30A in which oil is stored, and a lot 30B that is detachably inserted into the cylinder 30A.

  The connecting portion 32 is located on the lower end side of the oscillating body 26 that is further away from the upper end portion 26A (fixed portion with the truss beam 17) of the oscillating body 26, and is provided on the string member 28A that constitutes the side surface of the oscillating body 26. It has been. A connecting portion 34 is provided on the pillar 22 that faces the connecting portion 32 in the horizontal direction. A cylinder 30A and a lot 30B are connected to the connecting portions 32 and 34 by connecting pins 36, respectively, and the oil damper 30 expands and contracts in accordance with the relative displacement of the connecting portion 32 with respect to the connecting portion 34. ing.

  Next, the effect | action of the damping structure which concerns on this embodiment is demonstrated.

  FIGS. 3, 4 </ b> A, and 4 </ b> B schematically show a bending deformation state when the building 12 is shaken in the primary vibration mode. 4A shows a state before the building 12 is deformed, and FIG. 4B shows a state after the building 12 is deformed. 3 and FIG. 4B exaggerate the deformation amount of the building 12 for easy understanding.

  When the building 12 is shaken by an external force such as an earthquake or wind, and the bending deformation of the building body 13 is dominant, one outer wall 14 (left side in FIG. 3) is pulled and deformed, and the other outer wall 14 (right side in FIG. 3) is Compressive deformation. As a result, a difference in height occurs between the tops of the left and right outer walls 14, the building body 13 tilts, the hat truss 16 and the truss beam 17 on the upper floor of the building body 13 rotate, and the rotation angle of the truss beam 17 increases. Accordingly, the rocking body 26 rigidly connected to the truss beam 17 is rotationally deformed.

On the other hand, as shown in FIG. 4, even in the middle floor of the building body 13, a difference in height occurs between the left and right outer walls 14 due to bending deformation. However, this height difference is smaller than that of the upper floor of the building 12, that is, the tilt angle θ _M of the middle floor of the building body 13 is smaller than the tilt angle (rotation angle) θ _{T of} the oscillator 26 ( θ _M <θ _T ). Due to the difference in tilt angle between the upper floor and the middle floor, the connecting portion 32 provided on the lower end side of the rocking body 26 is displaced relative to the connecting portion 34 provided on the middle floor of the building body 13 (S ₁ , S ₂₎ to. As a result, the oil damper 30 connected to the connecting portions 34 and 32 expands and contracts, and vibration energy is absorbed.

  Here, the tilt angle of the building main body 13 increases from the lower floor to the upper floor, and becomes the maximum at the top of the building main body 13. Therefore, the larger the difference between the tilt angle of the layer to which the upper portion 26 </ b> A of the rocking body 26 is fixed and the tilt angle of the layer provided with the connecting portion 32, the greater the relative displacement amount of the connecting portion 32 with respect to the building body 13. . Therefore, by increasing the distance L (see FIG. 1) from the upper end portion 26A of the oscillating body 26 to the connecting portion 32, the relative displacement of the connecting portion 32 with respect to the connecting portion 34 can be increased.

If this is replaced with the rotation angle of the horizontal member such as the floor 18, when the building 12 is shaken in the primary vibration mode, the rotation angle of the horizontal member such as the floor 18 in each layer increases from the lower floor to the upper floor. It becomes the maximum at the top of the building body 13. Specifically, the horizontal member on the first floor of the building body 13 does not normally rotate, and its rotation angle is 0 degree. On the other hand, the horizontal members on the middle to high floors of the building main body 13 rotate according to the tilt angle of the building main body 13 and become the maximum at the top of the building main body 13. For example, in the schematic diagram shown in FIG. 4B, the rotation angle θ _B of the hat truss 16 is maximized. Accordingly, the larger the difference between the rotation angle of the horizontal member of the layer to which the upper portion 26A of the rocking body 26 is fixed and the rotation angle of the horizontal member of the layer provided with the connecting portion 32, the relative of the rocking body 26 to the building body 13 is. Displacement increases. Therefore, by increasing the distance L (see FIG. 1) from the upper end portion 26A of the oscillating body 26 to the connecting portion 32, the relative displacement of the connecting portion 32 with respect to the connecting portion 34 can be increased.

  In this embodiment, since the oscillating body 26 is arranged over a plurality of layers of the building 12, the connecting portion 32 can be provided at a position further away from the upper end portion 26A of the oscillating body 26. The distance L from the upper end portion 26A to the connecting portion 32 can be increased. Therefore, the relative displacement amount of the connecting portion 32 of the rocking body 26 with respect to the connecting portion 34 of the building body 13 can be increased, and the vibration energy absorption efficiency by the oil damper 30 can be increased.

  On the other hand, when the oscillating body 26 is relatively displaced with respect to the building body 13, the oscillating body 26 is deflected by the reaction force from the oil damper 30 with the connecting portion 32 as an action point. When the oscillator 26 is replaced with a cantilever beam, the amount of bending increases in proportion to the cube of the distance L from the upper end portion 26A to the connecting portion 32. Accordingly, as the distance L from the upper end portion 26A of the oscillating body 26 to the connecting portion 32 increases, the amount of bending increases, and the rigidity required for the oscillating body 26 increases. Therefore, if the distance L from the upper end portion 26A of the oscillating body 26 to the connecting portion 32 is excessively increased, the reinforcement cost and weight of the oscillating body 26 are increased.

  Therefore, the position where the connecting portion 32 is provided is designed in consideration of the interrelationship between the relative displacement between the rocking body 26 and the building body 13 and the amount of bending of the rocking body 26 due to the reaction force from the oil damper 30. Is desirable. In the present embodiment, the rocking body 26 has a three-dimensional truss structure, and the rigidity capable of sufficiently resisting the reaction force received from the oil damper 30 is ensured.

Further, when the building 12 swings in the primary vibration mode, as described above, the rotation angle of the horizontal member such as the floor 18 in each layer increases from the lower floor to the upper floor and becomes the maximum at the top of the building body 13. . In this embodiment, since the truss beam 17 is provided on the upper floor of the building body 13, the rotation angle of the truss beam 17 changes in the vicinity of the maximum value (θ _B ), that is, the rocking body fixed to the truss beam 17. The rotation angle θ _{T of} 26 changes in the vicinity of the maximum value (θ _B ). Accordingly, the relative displacement of the connecting portion 32 with respect to the connecting portion 34 is increased, and the vibration energy absorption efficiency by the oil damper 30 can be increased.

  Further, in the present embodiment, the case where the building 12 is shaken in the primary vibration mode has been described as an example, but when the building 12 is shaken in the higher vibration mode, the oil damper 30 is installed on the abdomen of each vibration mode, It is effective to give attenuation. For example, when the building 12 shakes in the secondary vibration mode and the tertiary vibration mode as in the multi-mass point vibration model shown in FIGS. 5B and 5C, in each vibration mode (natural vibration mode), The vibration energy can be efficiently absorbed by providing the connecting portion 34 and installing the oil damper 30 in the vicinity of the abdomen P where the horizontal displacement (interlayer deformation) increases or in the vicinity of the abdomen P.

  Further, the bending rigidity of the building 12 varies depending on the planar shape of the building 12. For example, as in the case of the building 40 shown in FIG. 7, when the planar shape is rectangular and the building 40 is bent and deformed in two horizontal directions, the aspect ratio (ratio of the width to the height of the building) is orthogonal to the side 40A. Since the bending rigidity in the direction (arrow X direction) is relatively small, the amount of bending deformation is large. Therefore, when the planar shape of the building 12 shown in FIG. 1 is a rectangle, the vibration energy absorption efficiency can be increased by installing the expansion / contraction direction of the oil damper as a direction orthogonal to the side having a small aspect ratio. .

  In this embodiment, the oscillating body 26 is fixed to the truss beam 17 constructed on the upper floor of the building 12, but the present invention is not limited to this. The oscillating body 26 may be disposed over a plurality of layers of the building 12 and may be fixed to a member on the lower to middle floors of the building 12. However, from the viewpoint of the rotation angle (tilt angle) of the oscillating body 26 described above, it is preferable to fix the oscillating body 26 to the hat truss 16 located at the top of the building 12, as shown in FIG. Moreover, the installation location of the rocking body 26 is not limited to the atrium space 20 and can be changed as appropriate according to the structure of the building. In the present embodiment, the space in the building 12 is effectively used by installing the swing body 26 in the atrium space 20.

  In this embodiment, the oil dampers 30 are installed on both sides of the rocking body 26. However, it is sufficient that at least one oil damper 30 is installed. In this embodiment, a viscous damper such as the oil damper 30 is used as the damping means. However, various dampers such as a viscoelastic damper, a friction damper, and a steel damper can be used instead of the oil damper 30.

  Further, the shape of the rocking body 26 is not limited to the wall shape described above, and may be a columnar shape or a rod shape. Furthermore, in this embodiment, the rocking body 26 is fixed to the truss beam 17 so as to be substantially perpendicular, but the rocking body 26 may be inclined and fixed to the truss beam 17.

  Furthermore, the vibration damping structure according to the present embodiment can be applied to various buildings such as a seismic structure and a seismic isolation structure, and is particularly effective for middle to high-rise buildings where bending deformation is dominant.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

12 Building 20 Blow-out space 26 Oscillator 30 Oil damper (damping means)
32 connecting part (second connecting part)
34 connecting part (first connecting part)

Claims (3)

Is disposed across the plurality of layers atrium space formed in the building, and the oscillator whose lower end portion is a free end with its upper end portion is fixed to the building,
A first connecting portion provided in the buildings surrounding the atrium, the provided on the side surface of the lower end of the rocking body, the first connection portion before SL when an external force to the first connecting portion and the building acts A second connecting portion that is relatively displaced with respect to the second connecting portion;
Damping structure with The vibration control structure according to claim 1, wherein the first connecting portion is located at an abdomen of the natural vibration mode of the building. A building having the vibration damping structure according to claim 1 or 2 and including an atrium space in which the rocking body is disposed.

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