JP2583390Y2 - Damping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for mitigating vibration of a building caused by an external force such as wind force or seismic force, in particular, seismic force.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the vibration of a building due to an earthquake, a vibration damping device is applied between a pair of upper and lower beams forming a part of a frame which is a frame of the building and a wall disposed between the beams. Have been. The vibration damping device is composed of a plurality of steel materials having different rigidities, that is, elasto-plastic dampers having both ends fixed to each beam and the wall (Japanese Patent Publication No. 4-33955). According to the vibration damping device, when a relative displacement in the horizontal direction occurs between the frame and the wall due to the seismic force acting on the building, a highly rigid bullet according to the magnitude of the earthquake. The plastic damper sequentially yields from the plastic damper to the stiff elastic-plastic damper and undergoes plastic deformation, whereby part of the seismic energy is absorbed and the vibration of the building is reduced.

[0003]

[Problems to be solved by the invention] By the way, the relatively rigid elasto-plastic damper, which is provided to cope with medium-scale or small-scale earthquakes, is suitable for all types of small- to large-scale earthquakes. Plastically deforms. Moreover, the high-rigidity elasto-plastic damper has a high frequency of plastic deformation because small- and medium-scale earthquakes occur more frequently than large-scale earthquakes, and is forced to undergo excessive plastic deformation during a large-scale earthquake. . For this reason, the elasto-plastic damper for a small-to-medium-scale earthquake having high rigidity is fatigued early and has to be replaced frequently. An object of the present invention is to provide a vibration damping device that allows easy replacement of an elasto-plastic damper for medium- or small-scale earthquakes that are easily fatigued.

[0004]

According to the present invention, there is provided a vibration damping device comprising: one of a pair of upper and lower beams forming a part of a frame of a building; A first elasto-plastic damper and a pair of first elasto-plastic dampers spaced apart from each other on a wall fixed to the other side of the beam and fixed parallel to the wall; A second elasto-plastic damper having a yield strength greater than the yield strength of Further, the vibration damping device of the present invention is provided with a space between one of the pair of upper and lower beams forming a part of the frame of the building and one of the pair of beams so as to be able to move relative to the frame. And a pair of first elasto-plastic dampers spaced apart from each other on a wall fixed to the other of the pair of beams and fixed in parallel with the wall, and are disposed between the first elasto-plastic dampers. A second elasto-plastic damper fixed to one of the beams and the wall and having a yield strength equal to or greater than a yield strength of the first elasto-plastic damper, and the second elastic in the longitudinal direction of the beam Means for limiting the relative movement of the plastic damper.

[0005] For example, when the second elasto-plastic damper is fixed to the wall, the relative movement restricting means is provided on both sides of the beam at a distance from the second elasto-plastic damper in the longitudinal direction of the beam. A pair of stoppers disposed and supported by the one beam, or at least one elongated hole provided in the second elasto-plastic damper and extending in the longitudinal direction of the beam, and supported by the one beam; And a bolt and nut assembly penetrating the elongated hole.

[0006]

According to the present invention, seismic force acting on the building causes repeated relative displacement between the other beam and the wall in one direction and the other. At this time, the first and second elasto-plastic dampers are each subjected to an external force. Since the first and second elasto-plastic dampers have the yield strength of the latter equal to or higher than the yield strength of the former, each of them deforms plastically in accordance with the magnitude of the external force, that is, the magnitude of the earthquake, and thereby has a relatively small scale. And each large seismic energy is absorbed. In the one having means for restricting the relative movement of the second elasto-plastic damper, the first and second elasto-plastic dampers receive the external force accompanying the occurrence of the earthquake, respectively, to undergo plastic deformation and deformation, respectively. Move relative. When the magnitude of the earthquake is large, the relative movement of the second elasto-plastic damper is large and is limited by the limiting means. The second elasto-plastic damper, which has stopped the relative movement by the restricting means, is plastically deformed thereafter.

In any of the vibration damping devices, the first elasto-plastic damper is a small-to-medium-sized earthquake having a higher frequency of occurrence than a large-scale earthquake. When the first elasto-plastic damper needs to be replaced, the first elasto-plastic damper is located outside the second elasto-plastic damper for a large earthquake.

When the relative movement restricting means comprises the pair of stoppers, the relative movement is stopped by the second elasto-plastic damper hitting each stopper. Also, in the case of the second elasto-plastic damper comprising a long hole and a bolt / nut assembly penetrating the long hole, the bolt / nut assembly abuts against an edge of the long hole. The relative movement of the second elasto-plastic damper is stopped.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a vibration damping device 10 includes a frame 14 of a building including a pair of upper and lower beams (only the upper beam is shown) 12, a partition wall and a bearing wall supported by the frame 14. And the wall 16 as shown in FIG.

The illustrated beam 12 is made of H-section steel, and the wall 16 is made of a reinforced concrete wall. The wall 16
The lower part is fixed to one (lower) beam, and the upper part is fixed to the other (upper) beam 12 via the vibration damping device 10. Both sides of the wall 16 together with the beam 12
Are spaced between a pair of pillars (not shown) constituting the above.

The vibration damping device 10 includes a pair of first elastic-plastic dampers 18 parallel to the wall 16 and a second elastic-plastic damper 20 disposed between the first elastic-plastic dampers 18. Each of the elasto-plastic dampers 18 and 20 is made of a steel plate member and has a rectangular planar shape.

Each first elasto-plastic damper 18 is spaced apart from each other in the width direction of the lower flange of the beam 12 and is welded to a pair of elongated plates 22 and both plates 22 welded to the lower flange. It is fixed to the beam 12 via the plate 24. More specifically, the bent upper end of each first elasto-plastic damper 18 is fixed to the plate 24 using a bolt and nut assembly 26 passing therethrough. The bent lower end of each first elastic-plastic damper 18 is fixed to a base plate 28 fixed to the top surface of the wall 16 using a bolt and nut assembly 29. Therefore, each of the first elastic-plastic dampers 18 can be easily attached and detached by tightening and releasing the bolt and nut assemblies 26 and 29, thereby easily exchanging them.

The second elastic-plastic damper 20 is fixed to the beam 12 and the wall 16 at its upper and lower portions via two pairs of brackets 30 and 32 extending downward and upward, respectively. The upper pair of brackets 30 is connected to the upper plate 24.
, And clamps the upper part of the wall 16. The two brackets 30 and the second elastic-plastic damper 20 are connected to each other by a plurality of bolt and nut assemblies 34 penetrating therethrough. The lower brackets 32 are similarly fixed to the wall 16 via the lower base plate 28, and clamp the lower portion of the second elasto-plastic damper 20.
The two brackets 32 and the second elastic-plastic damper 20 are connected to each other by a plurality of bolt and nut assemblies 36 penetrating therethrough.

By the way, the second elasto-plastic dampers 20 have a larger thickness dimension than each of the first elasto-plastic dampers 18, so that the second elasto-plastic dampers 20
It has a yield strength greater than 8.

When an earthquake causes a repetitive horizontal displacement between the frame 14 and the wall 16,
A shear force (external force) acts on both the elastic-plastic dampers 18 and 20. In the case of a small-to-medium-scale earthquake, only the first elasto-plastic dampers 18 having low yield strength plastically deform and absorb a part of the seismic force. In the case of a large-scale earthquake, the first elastic damper 1
In addition to 8, the second elasto-plastic damper 20 having a high yield strength plastically deforms and absorbs a part of the seismic force.

The first and second dampers 18 and 20 are respectively set to have an appropriate yield strength so that they are plastically deformed when an earthquake of an assumed scale occurs. The first elasto-plastic damper 18 is further provided with a plurality of long holes 38 extending in the vertical direction at intervals in the longitudinal direction of the beam 12. The upper and lower ends of the elongated portion between the long holes 38 yield,
Energy is absorbed by plastic deformation. Both dampers 18,
20 can be applied between the lower beam and the wall 16 instead of the illustrated example.

Referring to FIG. 3, in this example, unlike the examples shown in FIGS. 1 and 2, the upper end of the second elastic-plastic damper 20 is not fixed to the beam 12. Therefore, when a relative displacement occurs between the beam 12 and the wall 16 during an earthquake, the second elasto-plastic damper 20 relatively moves in the longitudinal direction of the beam 12.
In this example, instead of the pair of upper brackets 30 shown in FIGS. 1 and 2, a relative movement limiting means 40 for limiting the relative movement of the second elasto-plastic damper 20 is supported by the beam 12. ing. Further, in this example, the second elasto-plastic dampers 20 have a yield strength equal to or greater than the yield strength of each first elasto-plastic damper 18.

The relative movement restricting means 40 has a width extending in the longitudinal direction of the beam 12 and having a width larger than the width of the second elastic-plastic damper 20 (length in the longitudinal direction of the beam). And a notch 42 for receiving the upper end of the elasto-plastic damper 20 of FIG. The notch 42 allows the relative movement of the second elasto-plastic damper 20 between its two ends 44, and the second elasto-plastic damper 20
When the two ends 44 are hit, the relative movement is stopped. The ends 44 of the notch 42 thus form a pair of stoppers.

According to the vibration damping device 10, when an earthquake of a relatively small scale occurs, the first elasto-plastic damper 18 is plastically deformed, and a part of the seismic force is absorbed. At this time, depending on the magnitude of the earthquake, the second elasto-plastic
4 relative to each other or hit both stoppers 44. When the stoppers 44 abut against each other, if the yield strength of the second elasto-plastic damper 20 is the same as the yield strength of the first elasto-plastic damper 18, then the plastic deformation occurs.

On the other hand, when the magnitude of the earthquake is relatively large, the plastic deformation of the first elastic-plastic damper 18 proceeds, and after the second elastic-plastic damper 20 hits the stopper 44,
The second elasto-plastic damper 20 plastically deforms and contributes to absorbing seismic force. The distance between each stopper 44 and the second elasto-plastic damper 20 is determined in consideration of the magnitude of the earthquake corresponding to the first elasto-plastic damper 18, that is, the magnitude of the plastic deformation at this time.

As shown in FIG. 4, instead of the example shown in FIG. 3, the relative movement restricting means is provided at the upper part of the second elasto-plastic damper 20 and extends in at least one direction extending in the longitudinal direction of the beam 12.
(Three in the illustrated example) long holes 46 and both brackets 1
8 and a bolt and nut assembly 48 extending approximately through the center between the ends of each slot 46.

According to this, relative movement in the longitudinal direction of the beam 12 of the second elasto-plastic damper 20 is allowed up to contact between each end of the elongated hole 46 and each bolt / nut assembly 48, and Due to these mutual abutments, the second elasto-plastic damper 20
Is stopped, and then the second elasto-plastic damper 20 plastically deforms according to the magnitude of the earthquake, as in the example shown in FIG.

The example shown in FIG. 3 and FIG.
Elasto-plastic damper 20 is fixed to the upper beam 12 or the lower beam and the stopper 44 is supported on the wall 16, a long hole 46 is provided at the lower portion of the second elasto-plastic damper 20, and the bolt and nut assembly is provided. The solid 48 can be set so as to pass through the lower brackets 32 and the elongated hole. Further, the vibration damping device 10 can be applied to the lower beam and the wall 16 instead of the illustrated example described above. further,
The installation quantity of the vibration damping device 10 can be arbitrarily determined.

[Brief description of the drawings]

FIG. 1 is a side view of a vibration damping device according to the present invention.

FIG. 2 is a front view of the vibration damping device shown in FIG.

FIG. 3 is a front view of another example of the vibration damping device, showing one of a pair of first elastic-plastic dampers removed;

FIG. 4 is a front view of still another example of the vibration damping device, in which one of a pair of first elastic-plastic dampers is removed and shown.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 damper 12 beam 14 frame 16 wall 18, 20 first and second elasto-plastic damper 44 stopper 46 oblong hole 48 bolt / nut assembly

Claims (4)

(57) [Scope of request for utility model registration] 1. One of a pair of upper and lower beams forming a part of a frame of a building, and a wall spaced from one of the pair of beams and fixed to the other of the pair of beams. And a second elasto-plastic damper between the pair of first elasto-plastic dampers fixed parallel to the wall and having a yield strength greater than the yield strength of the first elasto-plastic damper. Damping device including elasto-plastic damper. 2. A pair of upper and lower beams forming a part of a frame of a building and being spaced from one of the pair of beams so as to be relatively movable with respect to the frame. A pair of first elasto-plastic dampers spaced apart from each other on a wall fixed to the other and parallel to the wall, and disposed between the two first elasto-plastic dampers; The first fixed to one of the walls;
Having a yield strength greater than the yield strength of the elasto-plastic damper
Elasto-plastic damper and the second with respect to the longitudinal direction of the beam
Means for restricting the relative movement of the elasto-plastic damper of the invention. 3. The second elasto-plastic damper is fixed to the wall, and the relative movement limiting means is arranged on both sides of the beam at a distance from the second elasto-plastic damper with respect to the longitudinal direction of the beam. 3. The vibration damping device according to claim 2, comprising a pair of stoppers supported by said one beam. 4. The at least one second elastic-plastic damper is fixed to the wall, and the relative movement restricting means is provided on the second elastic-plastic damper and has at least one elongated hole extending in a longitudinal direction of the beam. 3. The vibration damping device according to claim 2, further comprising a bolt and nut assembly supported by said one beam and penetrating through said elongated hole.