JP2878578B2 - 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 reducing the vibration of a building caused by an external force such as wind force or seismic force, in particular, a 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 lateral relative displacement 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 to a low-rigidity elasto-plastic damper and undergoes plastic deformation, thereby absorbing part of seismic energy and reducing the vibration of the building.

[0003]

By the way, the elasto-plastic damper having the highest rigidity provided in anticipation of dealing with small-scale earthquakes has plasticity in all cases from small-scale earthquakes to large-scale earthquakes. It is deformed and undergoes excessive plastic deformation in the case of a large-scale earthquake. For this reason, the elastic-plastic damper having the highest rigidity is fatigued at an early stage, and its frequent replacement is inevitable. An object of the present invention is to provide a vibration damping device in which the frequency of replacing an elasto-plastic damper is low.

[0004]

SUMMARY OF THE INVENTION The present invention provides a building frame including a pair of upper and lower beams, and a wall fixed to one of the pair of beams and spaced from the other of the pair of beams. It is a vibration-damping device applied with respect to a plate-shaped horizontal portion fixed to the other beam and a plate-shaped vertical portion connected to the wall and extending in parallel with the wall, the vertical portion being connected to the horizontal portion, An elasto-plastic damper consisting of a vertical portion having a yield strength equal to or higher than the yield strength of the horizontal portion, and arranged at a distance from the horizontal portion of the elasto-plastic damper in the longitudinal direction of the beam and fixed to the other beam. A pair of stoppers for stopping progress of the plastic deformation of the horizontal portion. A pair of stoppers for stopping the progress of the plastic deformation of the horizontal portion is provided at a horizontal portion of the elasto-plastic damper, and a pair of elongated holes extending in the longitudinal direction of the beam are spaced from both ends of the elongated hole. At the same time. Further, instead of providing a pair of stoppers for stopping the progress of the plastic deformation of the horizontal portion, a pair of stoppers for stopping the plastic deformation of the vertical portion can be provided. In this case, the yield strength of the vertical portion is conversely equal to or less than the yield strength of the horizontal portion. Further, the pair of stoppers are arranged at an interval in a longitudinal direction of the beam from a vertical portion of the elasto-plastic damper, and are fixed to the wall.

[0005]

According to the present invention, the seismic force acting on the building causes a relative displacement between the other beam and the wall repeatedly in one direction and the other direction. When the horizontal portion of the plastic damper receives an external force greater than its yield strength, it undergoes plastic deformation. When the yield strength of the vertical portion is the same as that of the horizontal portion, the vertical portion also undergoes plastic deformation. When the yield strength of the vertical portion is greater than that of the horizontal portion, the vertical portion is plastically deformed when subjected to an external force exceeding the yield strength. The seismic energy is due to plastic deformation of only the horizontal part when the scale is relatively small, or plastic deformation of both the horizontal part and the vertical part, and to the horizontal part and the vertical part when the scale is relatively large. Due to the plastic deformation of both parts of the section, respectively, they are absorbed, whereby the vibration of the building is mitigated. In any case, the repetitive plastic deformation of the horizontal portion is enabled only between the pair of stoppers, and the progress of the plastic deformation of the horizontal portion is stopped by abutting on each stopper of the horizontal portion, Excessive plastic deformation of the horizontal portion can be prevented, and thereby the fatigue of the horizontal portion can be reduced. Therefore, the frequency of replacement of the elasto-plastic damper can be reduced.

In each of the stoppers which penetrate at a distance from both ends of a pair of long holes extending in the longitudinal direction of the beam provided in the horizontal portion, the horizontal portion is plastically deformed. Then, when the edge of each elongated hole comes into contact with each stopper, the progress of plastic deformation of the horizontal portion is prevented.
In addition, by making each stopper penetrate each slot, it is possible to prevent a rotational movement that may occur between the frame and the wall during an earthquake.

When a pair of stoppers are provided for the vertical portion, contrary to the above, the plastic deformation of the vertical portion having a yield strength less than that of the horizontal portion is restricted by both stoppers.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a pair of vibration damping devices 10 includes a frame 16 including a pair of upper and lower beams 12, 14, and a wall 18 such as a partition wall or a load-bearing wall supported by the frame 16. Are applied at an interval from each other in the longitudinal direction of the beam.

[0009] Each of the beams 12 and 14 shown in the figure is made of H-section steel,
The wall 18 is made of a reinforced concrete wall. The wall 18 is fixed to one (lower) beam 12 at its lower part,
The upper portion is spaced from the other (upper) beam 14 and is fixed to the upper beam 14 via an elastic-plastic damper which forms a part of each vibration damper 10. Both sides of the wall 18 are spaced apart from a pair of pillars 20 constituting the frame 16 together with the beams 12 and 14.

Each of the vibration damping devices 10 includes a plate-shaped horizontal portion 22 fixed to a lower flange 14a (FIGS. 2 and 3) of an upper beam 14, and a plate-shaped vertical portion 2 connected to the horizontal portion 22.
An elasto-plastic damper 26 having a T-shaped cross-sectional shape consisting of a vertical portion 24 fixed to the upper portion of the wall 18 and being spaced apart in the longitudinal direction of the beam 14 above the horizontal portion 22; It comprises a pair of stoppers 28 for the horizontal portion 22 fixed to the beam 14.

Due to the earthquake, a repetitive lateral displacement occurs between the frame 16 and the wall 18, and when a shear force acts on the elasto-plastic damper 26, the elasto-plastic damper 26 is plastically deformed and the seismic force is reduced. Partially absorbs, thereby reducing the vibration of the building. Appropriate yield strength is set for each of the horizontal portion 22 and the vertical portion 24 so that a part or all of the elasto-plastic damper 26 undergoes plastic deformation when an earthquake of an assumed scale occurs. In the illustrated example, the yield strength of the vertical portion 24 and the yield strength of the horizontal portion 22 are equal. Alternatively, the yield strength of the vertical portion 24 can be set to be greater than the yield strength of the horizontal portion 22.

The illustrated elastic-plastic damper 26 is made of a steel plate.
The horizontal portion 22 and the vertical portion 24 each have a rectangular planar shape, and have the same thickness. The yield strength of each of the horizontal portion 22 and the vertical portion 24 is determined by its dimensions (length,
(Width and thickness) or by changing the size, quantity, shape, and the like of the holes described later provided in these as shown in the illustrated example.

The horizontal portion 22 has the same width as the lower flange 14a of the beam 14, and faces the lower flange 14a. The horizontal portion 22 is welded, a fastener such as a bolt and nut assembly, etc. via a pair of elongated plates 30 having the same length as the horizontal portion 22 and spaced from each other in the width direction of the lower flange 14a. Thus, the upper beam 14 is fixed to the lower flange 14a. By interposing the pair of plates 30, the effect of the vertical force (axial force) on the vertical portion 24 can be made extremely small.

The vertical portion 24 is fixed to the upper portion of the wall 18 via a plate 32 having the same width. The plate 32 has a part embedded in the wall 18 and the remaining part protruding into a notch 34 provided in the upper part of the wall 18. The plate 32 partially overlaps the lower end of the vertical portion 24 within the notch 34 and is fastened to the vertical portion 24 by a bolt and nut assembly 36.

As shown in FIG. 2 and FIG.
Has at least one hole (a plurality of long holes in the illustrated example) 38 extending in the longitudinal direction of the beam 14 in two rows, more specifically,
It is provided on both sides of the connecting portion of the vertical portion 24 extending in the horizontal direction perpendicular to the beam 14. The plurality of holes 38 have the same shape and the same length, and the distance between the holes 38 in each row is equal. Further, preferably, notches 39, particularly holes 28, are provided at both edges of the horizontal portion 22 in the arrangement direction of the holes 38.
The notches 39 having half the size of the holes 38 are provided at the same interval between the holes 38. The yield strength of the horizontal portion 22 can be changed by changing the number, the size, the shape, the interval between the holes 38, and the like. The yield strength is determined according to the assumed magnitude of the earthquake. Providing the elongated holes is preferable because the yield strength in the horizontal portion and the vertical portion can be easily set.

On the other hand, the vertical portion 24 extending downward from the longitudinal center portion of the horizontal portion 22 is also provided for setting the yield strength.
At least one hole (a plurality of long holes in the illustrated example) 40 is provided. In the illustrated example, a plurality of holes 40 extending in the vertical direction are arranged at equal intervals in the extending direction of the beam 14. The number, size, shape, interval, and the like of the holes 40 are also determined according to the assumed magnitude of the earthquake, as in the horizontal portion 22. It is desirable to provide a notch 41 at the edge of the vertical portion 24 as well as the notch 39.

The illustrated stoppers 28 are made of a steel block, and are disposed at the center in the width direction of the flange 14a of the beam 14 at a distance from both sides of the horizontal portion 22 in the direction in which the beam 14 extends. When the plastic deformation of 22 occurs, both the horizontal portion 22 and the vertical portion 24 or only the horizontal portion 22 can abut. The plastic deformation of the horizontal portion 22 will be described later. The distance between each stopper 28 and the horizontal portion 22 is determined in consideration of the degree of plastic deformation of the horizontal portion 22 in consideration of the material of the horizontal portion 22, yield strength, and the like.

According to this vibration damping device, the relative displacement in the longitudinal direction of the beam 14 occurs between the frame 16 and the wall 18, and the horizontal portion 22 and the vertical portion 24 of the elastic-plastic damper 26 When a shearing force exceeding the elastic limit is applied, the horizontal portion 22 and the vertical portion 24 have the same yield strength, and therefore are plastically deformed together. More specifically, holes 38
Both ends of the elongated portion between them and both ends of the elongated portion between the holes 40 are plastically deformed. However, only the horizontal portion 22 undergoes plastic deformation repeatedly between the stoppers 28 according to the magnitude of the earthquake, that is, in the case of a relatively small-scale earthquake,
In the case of a relatively large-scale earthquake, the abutment with both stoppers 28 stops the progress of plastic deformation.

Further, the yield strength of the vertical portion 24 is
When the elasto-plastic damper 26 is subjected to a shear force greater than the elastic limit of the horizontal portion 22 and smaller than the elastic limit of the vertical portion 24, that is, during a relatively small earthquake, only the horizontal portion 22 The plastic deformation occurs between the stoppers 28 or until the stoppers 28 abut. When the shearing force is larger than the elastic limit of the vertical portion 24, that is, when a relatively large earthquake occurs, both the horizontal portion 22 and the vertical portion 24 are plastically deformed. However, the horizontal portion 22 is plastically deformed until it comes into contact with both stoppers 28,
Thereafter, only the vertical portion 24 is repeatedly plastically deformed.

Therefore, the horizontal portion 22 is prevented from being excessively plastically deformed during a relatively large-scale earthquake. Thus, compared to the case where excessive plastic deformation of the horizontal portion 22 is allowed, the fatigue of the horizontal portion 22 is small, and the life of the elasto-plastic damper 26 is long.

Instead of the example shown, an elasto-plastic damper 26 can be applied for the lower beam 12 and the wall 18.
Further, the number of the elastic-plastic dampers 26 can be arbitrarily determined.

Next, as shown in FIG. 4, when the horizontal axis of the beam 14 and the vertical center axis of the wall 18 are not in the same vertical plane and they are out of alignment with each other, An elasto-plastic damper 26 is used in which the vertical portion 24 intersects in an L-shape and is continuous.
It is desirable to arrange at a position deviated from the center in the width direction of the beam 14 to one edge thereof and spaced apart from both ends of the intersection of the horizontal portion 22 and the vertical portion 24 in the longitudinal direction of the beam 14. In this example, the number of holes 38 in the horizontal portion 22 and the number of holes 40 in the vertical portion 24 are the same, have the same width dimension, length dimension, and the same interval, and the horizontal portion 22 and the vertical portion 2
No. 4 has the same yield strength. Of course, the vertical part 24
Can be set to be larger than the yield strength of the horizontal part.

Referring to FIGS. 5 and 6, this example is:
Each stopper 28 is constituted by a pin instead of the block,
And an elongated hole 42 allowing the stopper 28 to pass through the horizontal portion 22.
Is different from the example shown in FIG.

A pair of stoppers 2 extending downward from the beam 14
A pair of elongated holes 42 for receiving the holes 8 extend in the longitudinal direction of the beam 14, and each stopper 28 extends through substantially the center between both ends of each elongated hole 42. As a result, when the horizontal portion 22 is plastically deformed in the longitudinal direction of the beam 14 and each end of the elongated hole 42 comes into contact with each stopper 28, the progress of the plastic deformation of the horizontal portion 22 is stopped. In addition, since both stoppers 28 penetrate through both elongated holes 42, mutual rotation of frame 16 and wall 18, which may occur when an earthquake occurs, can be prevented. In order to prevent this mutual rotation, it is desirable to set the width of the elongated hole 42 to a value slightly larger than the diameter of the stopper 28.

Next, referring to FIGS. 7 and 8, this example differs from the examples shown in FIGS. 1 to 6 in that a pair of stoppers 28 are provided with respect to the vertical portion 24.

The stoppers 28 are made of a steel plate embedded in an upright wall opposed to the direction of extension of the beam 14 of the notch 34 at the top of the wall 18, and are formed on both sides of the vertical portion 24 in the direction of extension of the beam 14. Are respectively opposed to the both sides so as to be able to abut.

According to this example, when an earthquake occurs, the horizontal portion 22 and the vertical portion 24 of the elasto-plastic damper 26 behave in a manner opposite to the horizontal portion 22 and the vertical portion 24 in the example shown in FIGS. That is, the relative displacement in the longitudinal direction of the beam 14 occurs between the frame 16 and the wall 18, and accordingly, the vertical portion 24 and the horizontal portion 22 of the elasto-plastic damper 26 receive a shearing force exceeding these elastic limits. And the vertical part 2
4 and the horizontal portion 22 have the same yield strength, and therefore are plastically deformed together. However, only the vertical portion 24 is plastically deformed repeatedly between the stoppers 28 according to the magnitude of the earthquake, that is, in the case of a relatively small earthquake, and abuts against the both stoppers 28 in the case of a relatively large earthquake. The progress of plastic deformation is stopped.

Further, the yield strength of the horizontal portion 22 is
When the elastic-plastic damper 26 is subjected to a shearing force larger than the elastic limit of the vertical portion 24 and smaller than the elastic limit of the horizontal portion 22, that is, in a relatively small-scale earthquake, only the vertical portion 24 The plastic deformation occurs between the stoppers 28 or until the stoppers 28 abut. When the shearing force is larger than the elastic limit of the horizontal portion 22, that is, in the case of a relatively large earthquake, both the vertical portion 24 and the horizontal portion 22 are plastically deformed. However, the vertical portion 24 is plastically deformed until it comes into contact with both stoppers 28,
Thereafter, only the horizontal portion 22 is repeatedly plastically deformed.

Therefore, the vertical portion 24 is prevented from being excessively plastically deformed during a relatively large-scale earthquake. Therefore, compared with the case where excessive plastic deformation of the vertical portion 24 is allowed, the fatigue of the vertical portion 24 is small, and the life of the elasto-plastic damper 26 is long.

As shown in FIG. 9, when a notch 44 is provided at the upper portion of the wall 18 and is thinner than the lower portion, a steel plate 46 is embedded in the step of the notch 44, and the plate 46 is provided with a vertical elastic-plastic damper. The vertical portion 24 can be fixed to the wall 18 by welding the lower end of the portion 24.

[Brief description of the drawings]

FIG. 1 is a front view of a frame and a wall to which a vibration damping device according to the present invention is applied.

FIG. 2 is a longitudinal sectional view of the vibration damping device.

FIG. 3 is a cross-sectional view of the vibration damping device.

FIG. 4 is a cross-sectional view of another example of a vibration damping device.

FIG. 5 is a longitudinal sectional view of a vibration damping device of still another example.

FIG. 6 is a cross-sectional view of a vibration damping device of still another example.

FIG. 7 is a longitudinal sectional view of a vibration damping device of still another example.

FIG. 8 is a cross-sectional view of still another example of the vibration damping device.

FIG. 9 is a cross-sectional view of a mounting portion between a vertical portion of the step plastic damper and a wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration suppression device 12,14 Beam 16 Frame 18 Wall 22,24 Horizontal part and vertical part of elasto-plastic damper 26 Elasto-plastic damper 28 Stopper 38,40 hole

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 9/02

Claims (3)

(57) [Claims] 1. A building frame including a pair of upper and lower beams,
A damping device applied to a wall fixed to one of the pair of beams and spaced from the other of the pair of beams, wherein the plate-like horizontal portion is fixed to the other beam. An elasto-plastic damper comprising a vertical portion connected to the horizontal portion and fixed to the wall and extending in parallel with the wall, the vertical portion having a yield strength greater than or equal to the yield strength of the horizontal portion; and A damping device, comprising: a pair of stoppers arranged at a distance from a horizontal portion of a damper in a longitudinal direction of the beam and fixed to the other beam to stop progress of plastic deformation of the horizontal portion. 2. A building frame including a pair of upper and lower beams,
A damping device applied to a wall fixed to one of the pair of beams and spaced from the other of the pair of beams, wherein the plate-like horizontal portion is fixed to the other beam. An elasto-plastic damper comprising a vertical portion connected to the horizontal portion and fixed to the wall and extending in parallel with the wall, the vertical portion having a yield strength greater than or equal to the yield strength of the horizontal portion; and A pair of stoppers fixed to the beam, for stopping the progress of the plastic deformation of the horizontal portion, the pair of stoppers being provided on the horizontal portion of the elasto-plastic damper and extending in the longitudinal direction of the beam, respectively; A damping device including: a pair of stoppers penetrating from both ends of the hole at an interval. 3. A building frame including a pair of upper and lower beams,
A damping device applied to a wall fixed to one of the pair of beams and spaced from the other of the pair of beams, wherein the plate-like horizontal portion is fixed to the other beam. An elasto-plastic damper comprising a vertical portion connected to the horizontal portion and fixed to the wall and extending in parallel with the wall, the vertical portion having a yield strength equal to or lower than the yield strength of the horizontal portion; and A damping device comprising: a pair of stoppers arranged at a distance in a longitudinal direction of the beam from a vertical portion of a damper and fixed to the wall, for stopping progress of plastic deformation of the vertical portion.