JP5403872B2 - Vibration control structure - Google Patents

Description

  The present invention relates to a vibration damping structure that suppresses shaking of a structure.

A vibration damping structure is generally used in which a brace is provided on a diagonal line of a rectangular structural member constructed of a vertical member and a transverse member to suppress vibrations acting on the structural member.
However, in this vibration damping structure, when the structural member is shaken, the bracing is deformed, and at the same time, the plate-like fixing metal that joins the bracing and the structural member is greatly deformed, and the shaking of the structural member cannot be effectively suppressed There was a problem.

  As a countermeasure, it is conceivable to increase the rigidity of the fixing bracket. However, if the rigidity of the fixing bracket is increased, the deformation of the fixing bracket can be suppressed, but the vibration energy absorbed by the deformation of the fixing bracket can be absorbed. Since it disappears, it is considered that the braces and the structural members are damaged.

  In view of this, a vibration damping structure has been proposed in which an elastic member is provided between the fixing bracket and the brace, and the elastic member absorbs vibration energy to suppress deformation of the fixing bracket (hereinafter referred to as a fixing member). (Patent Document 1)

JP 2001-207677 A

  However, since the bracing of this damping structure is attached to the structural member via the elastic member, if the structural member swings slightly, the elastic member will only deform and the bracing will not generate drag, and the structural member There is a problem that it is not possible to suppress the small shaking of.

  An object of the present invention is to provide a vibration damping structure capable of suppressing deformation of the fixing member while suppressing small shaking of the structural member in consideration of the above facts.

The vibration damping structure according to claim 1 of the present invention is a rectangular structural member constructed by a pair of vertical members and a pair of cross members, and a brace provided on a diagonal line of the rectangular structural member, A fixing member for fixing the braces to the structural member, a first plate member fixed to the structural member,
The second plate member fixed to the braces, and the elasticity fixed to the first plate member and the second plate member and deformed to suppress relative displacement between the first plate member and the second plate member. And a member .

  According to the above configuration, in the event of an earthquake, the cross member constituting the structural member relatively translates and the vertical member tilts, so that a compression or tensile force acts on the bracing, and the structural member and The braces are relatively displaced.

Then, the first plate member fixed to the structural member and the second plate member fixed to the brace are also relatively displaced, whereby the elastic member fixed to the first plate member and the second plate member is deformed. To do. Due to the deformation of the elastic member , the elastic member generates a restoring force to return to the original shape. By this restoring force, it is possible to suppress the deformation of the fixing member by suppressing the relative displacement between the first plate member and the second plate member.

The vibration damping structure according to claim 2 of the present invention includes a rectangular structural member constructed by a pair of vertical members and a pair of cross members, a brace provided on a diagonal line of the rectangular structural member, A fixing member that fixes the bracing to the structural member, a base plate member fixed to the structural member, a pivot plate that is rotatably attached to the base plate member, and is disposed to face the brace, A bracing plate member that is fixed to the brace and is disposed to face the rotating plate member, and is fixed to the rotating plate member and the bracing plate member, and is deformed to deform the rotating plate member and the bracing. And an elastic member that suppresses relative displacement of the plate member .

  According to the above configuration, in the event of an earthquake, the cross member constituting the structural member relatively translates and the vertical member tilts, so that a compression or tensile force acts on the bracing, and the structural member and The braces are relatively displaced.

When a tensile force acts on the bracing, the bracing tends to be displaced away from the structural member. Then, the rotating plate member attached to the base plate member fixed to the structural member, the elastic member disposed between the braces plate member fixed to the brace, the shearing force is applied, the elastic member Deforms in the shear direction. When the elastic member is deformed, a restoring force for returning to the original shape is generated in the elastic member . By this restoring force, it is possible to suppress the deformation of the fixing member by suppressing the relative displacement between the bracing plate member and the rotating plate member.

On the other hand, when a force in the compression direction acts on the braces, the braces are deformed so as to swell outward, and in the vicinity of the fixed member, the braces are displaced so as to fall outward relative to the structural member. Then, the bracing plate member fixed to the braces is also displaced so as to fall outward, and the rotating plate member attached to the bracing plate member via the elastic member rotates outward. Accordingly, the elastic member provided between the braces plate member and the rotating plate member, the shearing force is applied, the elastic member is deformed in the shear direction. When the elastic member is deformed, a restoring force for returning to the original shape is generated in the elastic member . By this restoring force, it is possible to suppress the deformation of the fixing member by suppressing the relative displacement between the bracing plate member and the rotating plate member.

In addition, since the elastic member is deformed in the shearing direction and the relative displacement between the structural member and the brace is suppressed, the vibration damping performance can be controlled by controlling the deformation and restoring force of the elastic member in the shearing direction.

According to Claim 3 of the present invention, in the first or second aspect , the elastic member is formed of a rubber material.
According to the said structure, since the elastic member is shape | molded with the rubber material, it has an inexpensive structure.

  According to the vibration damping structure of the present invention, it is possible to suppress the deformation of the fixing member while suppressing small shaking of the structural member.

A vibration damping structure 10 according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 7, the vibration damping structure 10 according to the first embodiment includes a frame-shaped structural member 14 having a thickness and a width that fits into a Western-style wall or a Japanese-style room wall of a detached building 12. I have.

  As shown in FIGS. 5 and 6, the structural member 14 includes a pair of columns 16 extending in the vertical direction and a pair of beams 18 extending in the horizontal direction, and the upper and lower ends of the columns 16 are connected to the pair of beams 18. It is fixed by a joint metal (not shown). In addition, although the beam 18 below the first floor of the building 12 (see FIG. 7) is called a base, in this embodiment, the cross members of the structural member 14 are collectively called the beam 18.

  Further, on the diagonal line of the rectangular structural member 14 composed of the column 16 and the beam 18, a brace 20 is provided to connect the connecting portion of the column 16 and the beam 18.

  Both ends of the brace 20 are coupled to the structural member 14 by a fixing bracket 22 having a flat plate portion 22A and a flange portion 22B formed by bending two sides of the flat plate portion 22A into an L shape. Specifically, the fixing bracket 22 is fixed to the column 16 and the beam 18 by driving a nail 34 (see FIG. 4) into the column 16 and the beam 18 through a circular hole provided in the flange portion 22B of the fixing bracket 22. The nail 34 (see FIG. 4) is driven into the brace 20 through a circular hole provided in the flat plate portion 22 </ b> A of the bracket 22, so that the fixing bracket 22 is fixed to the brace 20.

  Further, as shown in FIGS. 3 and 4, an attenuation device 60 is provided on the opposite side of the fixing bracket 22 across the brace 20 as an attenuation means for suppressing deformation of the fixing bracket 22 that occurs during an earthquake. Yes.

  The damping device 60 includes a rectangular first plate member 62 fixed to the beam 18, a rectangular second plate member 64 fixed to the brace 20, and the first plate member 62 and the second plate member 64. And an elastic member 66 that deforms and restrains relative displacement between the first plate member 62 and the second plate member 64.

  Specifically, the first plate member 62 is provided with a plurality of circular holes, and the first plate member 62 is fixed to the beam 18 by driving the nail 34 into the beam 18 through the circular hole. Further, the second plate member 64 is provided with a plurality of circular holes in the same manner as the first plate member 62, and the second plate member 64 is driven by driving the nail 34 into the brace 20 through the circular holes. 64 is fixed to the brace 20.

  Further, the elastic member 66 whose end portions are vulcanized and bonded to the first plate member 62 and the second plate member 64 is formed in a circular arc shape with a rubber material, and has a substantially circular cross section.

  The rubber material of the elastic member 66 is a general rubber material such as ethylene propylene rubber (EPR, EPDM), nitrile rubber (NBR), butyl rubber, halogenated butyl rubber, chloroprene rubber (CR), natural rubber (NR). Isoprene rubber (IR), styrene butadiene rubber (SBR), butadiene rubber (BR), and the like can be used.

  With such a configuration, when the first plate member 62 and the second plate member 64 are relatively displaced, the elastic member 66 is deformed, and the elastic member 66 is deformed so that the elastic member 66 has an original shape. A restoring force to return is generated. By this restoring force, the relative displacement between the first plate member and the second plate member is suppressed.

  Next, the operation of the vibration damping structure 10 of the first embodiment will be described.

  As shown in FIGS. 2A and 2B, when the building 12 (see FIG. 7) is shaken in the left-right direction due to an earthquake or the like, the beam 18 translates left and right, the column 16 tilts left and right, and the upper side The connecting portion between the beam 18 and the column 16 moves in a circular hole shape.

  Further, as shown in FIG. 2A, when the upper beam 18 is translated in the right direction on the paper surface, the brace 20 tilts to the right side on the paper surface, and the brace 20 is pulled in the direction in which the brace 20 is pulled (FIG. 2). The force indicated by the arrow A) shown in FIG.

  In addition, as shown in FIG. 2B, when the upper beam 18 is translated in the left direction on the paper surface, the brace 20 tilts leftward on the paper surface, and the brace 20 is compressed in the direction in which the brace 20 is compressed (see FIG. 2B). The force indicated by the arrow B) shown in FIG.

  As shown in FIG. 2A, when a force in the direction of pulling the brace 20 acts on the brace 20, the brace 20 is displaced in a direction away from the structural member 14. Then, as shown in FIG. 1A, the fixing bracket 22 is deformed so as to extend in the vertical direction, and at the same time, the elastic member 66 is also deformed by extending in the vertical direction.

  Due to the deformation of the elastic member 66, a restoring force is generated in the elastic member 66 to return to the original shape, and this restoring force prevents the brace 20 from being displaced in a direction away from the structural member 14. Thereby, it can suppress that the fixing metal fitting 22 deform | transforms.

  On the other hand, as shown in FIG. 2B, when a force in the direction of compressing the brace 20 acts on the brace 20, the brace 20 is deformed so as to bulge outward, and the brace 20 falls to the outside with respect to the beam 18. Displace as follows. Then, as shown in FIG. 1B, the fixing bracket 22 is also deformed so as to fall outward, and at the same time, the elastic member 66 moves in the direction in which the fixing bracket 22 falls (the direction of arrow C shown in FIG. 1B). ) And deforms.

  Due to the deformation of the elastic member 66, a restoring force is generated in the elastic member 66 so as to return to the original shape. This restoring force prevents the brace 20 from being displaced so as to fall outward, and is further fixed. Deformation of the metal fitting 22 can be suppressed.

  When the shaking due to the earthquake is small, the fixing bracket 22 hardly deforms, and the shaking of the structural member 14 can be suppressed by the rigidity of the brace 20 through the fixing bracket 22.

Next, a vibration damping structure 10 according to a second embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this embodiment, as shown in FIGS. 9 and 10, the damping device 70 is not provided with the arc-shaped elastic member 66 (see FIG. 3). Instead, the rectangular elastic member 80 is provided. Is provided.

  Specifically, the damping device 70 includes a rectangular base plate member 72 fixed to the beam 18. The base plate member 72 is provided with two circular holes. The base plate member 72 is fixed to the beam 18 by driving the nail 34 into the beam 18 through the circular hole. Further, the base plate member 72 is provided with a side portion 72A that is parallel to the flat plate surface 20A of the brace 20 and is most adjacent to the brace 20, and a flat plate is provided on the side portion 72A via a rotation shaft 74. A rectangular rotation plate member 76 arranged to face and parallel to the surface 20A is rotatably supported.

  A rectangular bracing plate member 78 is provided at a position facing the rotating plate member 76. The bracing plate member 78 is fixed to the bracing 20 with the nail 34. Further, a rectangular elastic member 80 vulcanized and bonded to the bracing plate member 78 and the rotating plate member 76 is provided between the bracing plate member 78 and the rotating plate member 76.

  Next, the operation of the vibration damping structure 10 of the second embodiment will be described.

  As shown in FIGS. 8A and 8B, when the building 12 (see FIG. 7) sways in the left-right direction due to an earthquake or the like, the beam 18 translates left and right, and the column 16 tilts left and right. The connecting portion between the beam 18 and the column 16 moves in a circular hole shape, and a force in a direction in which the brace 20 is pulled and a force in a direction in which the brace 20 is compressed act on the brace 20.

  As shown in FIG. 8A, when a tensile force is applied to the brace 20, the brace 20 tends to be displaced away from the beam 18. Then, a force in the shear direction is applied to the elastic member 80 disposed between the rotating plate member 76 attached to the base plate member 72 fixed to the beam 18 and the bracing plate member 78 fixed to the brace 20. Acting, the elastic member 80 is deformed in the shear direction. When the elastic member 80 is deformed, the elastic member 80 generates a restoring force to return to the original shape. With this restoring force, relative displacement between the bracing plate member 78 and the rotating plate member 76 can be suppressed, and further, deformation of the fixing bracket 22 can be suppressed.

  On the other hand, as shown in FIG. 8B, when a force in the compression direction acts on the brace 20, the brace 20 is deformed so as to bulge outward, and the brace 20 is displaced so as to fall outward with respect to the beam 18. . Then, the bracing plate member 78 fixed to the brace 20 is also displaced so as to fall outward, and the rotating plate member 76 attached to the bracing plate member 78 via the elastic member 80 rotates outward. . Thereby, a force in the shearing direction acts on the elastic member 80 provided between the bracing plate member 78 and the rotating plate member 76, and the elastic member 80 is deformed in the shearing direction. When the elastic member 80 is deformed, the elastic member 80 generates a restoring force to return to the original shape. With this restoring force, it is possible to suppress the deformation of the fixing bracket 22 by suppressing the relative displacement between the bracing plate member 78 and the rotating plate member 76.

  As described above, even if a force in the direction of pulling the brace 20 is applied to the brace 20, or a force in a direction of compressing the brace 20 is applied, the elastic member 80 is deformed in the shearing direction and the brace 20 is in contact with the structural member 14. In order to suppress the relative displacement, the vibration damping performance can be controlled by adjusting the deformation and restoring force in the shear direction of the elastic member 80.

Next, a vibration damping structure 10 according to a third embodiment of the present invention will be described with reference to FIG.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, the rubber material of the elastic member 66 is a highly damped high-damping rubber (loss coefficient (expressed by tan (δ) where δ is the phase difference between stress and strain acting on the rubber)). 0.1-0.6) is used.

  Here, an example of the hysteresis restoring force characteristic of the high damping rubber is shown in the graph of FIG. 11 (the horizontal axis indicates the horizontal displacement δ and the vertical axis indicates the horizontal load Q), and the high damping rubber is deformed and restored. It can be seen that the energy in the shaded area is absorbed by the high damping rubber. That is, by using a high damping rubber as the material of the elastic member 66, the elastic energy can be efficiently absorbed by the elastic member 66 being deformed by the vibration energy generated by the shaking during the earthquake.

(A) (B) It is the cross-section part which showed the damping structure in 1st Embodiment of this invention, and showed the state which the fixture was deform | transformed by the earthquake. (A) (B) It is the front part which showed the damping structure in 1st Embodiment of this invention, and showed the state which the structural member etc. shook by the earthquake. It is the expansion perspective view which showed the damping structure which concerns on 1st Embodiment of this invention, and showed the damping device etc. 1 is a cross-sectional view showing a damping structure according to a first embodiment of the present invention and showing an attenuation device and the like. It is the disassembled perspective view which showed the damping structure which concerns on 1st Embodiment of this invention. It is the front view which showed the damping structure which concerns on 1st Embodiment of this invention. 1 is a schematic front view of a building in which a damping structure according to a first embodiment of the present invention is employed. A) (B) It is the cross-section part which showed the damping structure in 2nd Embodiment of this invention, and showed the state which the fixing bracket deform | transformed by the earthquake. It is the expansion perspective view which showed the damping structure which concerns on 2nd Embodiment of this invention, and showed the attenuation device. It is sectional drawing which showed the damping structure which concerns on 2nd Embodiment of this invention, and showed the attenuation device. It is drawing which shows an example of the log | history restoring force characteristic of the high damping rubber which is a material of the elastic member which concerns on 3rd Embodiment of this invention with a graph.

Explanation of symbols

10 Damping structure 12 Building (structure)
14 Structural member 16 Column (vertical)
18 Beam (cross member)
20 Bracing 22 Fixing bracket (fixing member)
60 Attenuator (Attenuator)
62 First plate member 64 Second plate member 66 Elastic member 70 Damping device (damping means)
72 Foundation plate member 76 Rotating plate member 78 Bracing plate member 80 Elastic member

Claims (3)

A rectangular structural member constructed of a pair of longitudinal members and a pair of cross members;
Bracing provided on the diagonal of the rectangular structural member,
A fixing member for fixing the braces to the structural member;
A first plate member fixed to the structural member;
A second plate member fixed to the braces;
An elastic member fixed to the first plate member and the second plate member and deformed to suppress relative displacement between the first plate member and the second plate member;
Damping structure characterized by comprising A rectangular structural member constructed of a pair of longitudinal members and a pair of cross members;
Bracing provided on the diagonal of the rectangular structural member,
A fixing member for fixing the braces to the structural member;
A base plate member fixed to the structural member;
A pivot plate that is pivotally attached to the base plate member and is disposed opposite the brace;
A bracing plate member that is fixed to the bracing and is disposed opposite the rotating plate member;
An elastic member fixed to the rotating plate member and the bracing plate member and deformed to suppress relative displacement between the rotating plate member and the bracing plate member;
Damping structure characterized by comprising The vibration damping structure according to claim 1 or 2, wherein the elastic member is formed of a rubber material .

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