JP2014105545A - Vibration control structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control structure capable of effectively contracting and retreating an oil damper depending on vibration to enhance vibration damping effects.SOLUTION: In a vibration control structure 1, an oil damper 30 joined to a damper mounting portion 31 of an upper support 7 and a damper mounting portion 32 of a lower support 17 is expanded/contracted between the upper support 7 and the lower support 17 along with interlayer deformation to actualize the reliable transmission of force generated by the interlayer deformation to the oil damper 30. Thus, the oil damper 30 is effectively expanded/contracted depending on vibration to enhance vibration damping effects.

Description

  The present invention relates to a vibration damping structure, and more particularly to a vibration damping structure for a building including an upper beam made of steel and a lower beam made of reinforced concrete.

  Conventionally, many researches and developments have been made on vibration damping structures, and in particular, vibration damping structures using oil dampers are known. Patent Document 1 discloses a vibration damping structure for a structure in which an oil damper is interposed between a tip of a brace having an inverted V shape or a V shape and a beam.

JP-A-5-311920

  When an oil damper is interposed between the brace and the beam as in the vibration damping structure described in Patent Document 1, depending on the brace mounting position (for example, a position where deflection is likely to occur in the middle part of the beam) When a horizontal force acts in the direction in which the damper is retracted, the beam is deflected by a reaction force from the oil damper, and one end of the oil damper is shaken in the vertical direction. In such a state, the oil damper does not degenerate smoothly and cannot fully exhibit the damping effect.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a damping structure capable of effectively degenerating an oil damper and enhancing a damping effect of vibration. To do.

  The vibration damping structure of the present invention includes an upper beam made of steel, a lower beam made of reinforced concrete, an upper support suspended from the upper beam, and standing up from the lower beam and facing the upper support in a predetermined region in the height direction. And a lower support that is disposed in a predetermined region and joined to the first part of the upper support and the second part of the lower support, and expands and contracts between the upper support and the lower support in accordance with interlayer deformation. And a damper, wherein the distance between the upper beam and the first part of the upper support is shorter than the distance between the lower beam and the second part of the lower support.

  According to this vibration damping structure, when an interlayer deformation that is a displacement in the horizontal direction occurs, the oil damper joined to the first portion of the upper support and the second portion of the lower support in accordance with the interlayer deformation It expands and contracts between the support and the lower support. Therefore, the force generated by the interlayer deformation can be reliably transmitted to the oil damper. Therefore, the oil damper can be effectively expanded and contracted according to the displacement, and the vibration damping effect can be enhanced. In addition, the distance between the first portion to which the oil damper is joined in the upper support and the upper beam is shorter than the distance between the second portion to which the oil damper is joined in the lower support and the lower beam. That is, the oil damper is provided near the upper beam between the upper beam and the lower beam. The upper beam made of steel is less rigid and more flexible than the lower beam made of reinforced concrete, but since the oil damper is located closer to the upper beam, the oil beam from the oil damper that acts on the upper beam when interlaminar deformation occurs. The bending due to the reaction force is reduced, and the deflection of the upper beam is suppressed. As a result, the oil damper can be smoothly degenerated.

  The vibration damping structure of the present invention includes a cover member that is joined to the upper support or the lower support and covers the oil damper from both sides in the horizontal direction orthogonal to the extending direction of the upper beam. According to this configuration, when an interlayer deformation occurs and a force is applied in a direction in which the oil damper is retracted, the oil damper contacts the cover member, so that the oil damper can be prevented from moving out of the plane. The oil damper can be degenerated smoothly.

  The vibration damping structure of the present invention includes an upper cover member that is a cover member joined to the upper support, and a lower cover member that is a cover member joined to the lower support. According to this configuration, the upper cover member is joined to the upper support and the lower cover member is joined to the lower support, that is, the cover member is divided into two members. The take-out length from the support or the lower support can be reduced, and the movement of the oil damper in the out-of-plane direction can be more effectively regulated.

  In the vibration damping structure of the present invention, the upper cover member and the lower cover member have overlapping portions that overlap each other in the horizontal direction orthogonal to the extending direction of the upper beam. According to this configuration, since the upper cover member and the lower cover member overlap each other in the overlapping portion, the upper support and the lower support due to the reaction force from the oil damper when a force is applied in the direction in which the oil damper is retracted. The movement of the tip portion (free end side) of the lens in the out-of-plane direction is restricted. Along with this, the movement of the oil damper in the out-of-plane direction is also restricted, and the oil damper can be smoothly retracted.

  According to the present invention, the oil damper can be effectively degenerated according to vibration, and the vibration damping effect can be enhanced.

It is a front view of the damping structure concerning a 1st embodiment of the present invention. It is a front view which expands and shows the oil damper vicinity in FIG. (A) is the IIIA-IIIA sectional view taken on the line of FIG. 1, (b) is the IIIB-IIIB sectional view taken on the line of FIG. It is a front view of the damping structure which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  As shown in FIG. 1, the vibration damping structure 1 of the first embodiment is a structure used for a building having a steel frame. The vibration damping structure 1 is for effectively attenuating vibration when vibration is generated in a building due to, for example, an earthquake and an interlayer deformation that is a horizontal displacement occurs.

  The vibration control structure 1 includes an upper beam 2 made of steel and a lower beam 3 made of reinforced concrete. The upper beam 2 is made of, for example, H-shaped steel, and is supported by a column (not shown) standing from the lower beam 3 and extends in the horizontal direction. The lower beam 3 is a fabric foundation, for example, and extends in parallel with the upper beam 2 so as to face the upper beam 2. The building provided with the damping structure 1 is a single-layer building or a multi-layer building. The vibration control structure 1 is provided on the first floor of the building.

  The vibration control structure 1 includes an upper frame 4 provided so as to hang downward in the vertical direction from the upper beam 2 and a lower frame 6 provided so as to stand vertically upward from the lower beam 3. The lower frame 6 is longer in the height direction than the upper frame 4. The lower end of the upper frame 4 and the upper end of the lower frame 6 are close to each other at a height position near the upper beam 2. The upper frame 4 and the lower frame 6 are connected to each other by four oil dampers 30a to 30d (see FIG. 2) arranged in a substantially horizontal direction.

  The upper frame 4 is joined to the flange portion 2a of the upper beam 2 and is made of two steel plates joined to the cantilevered upper support 7 that hangs vertically downward from the upper beam 2 and the upper support 7. Side cover (upper cover member) 16. The upper support 7 includes a pair of a first upper support 8 and a second upper support 9 that are disposed with a predetermined interval in the extending direction of the upper beam 2. The first upper support body 8 and the second upper support body 9 are arranged in parallel to each other.

  The first upper support 8 is welded to the joint box 10 bolted to the flange portion 2a, the columnar member 11 welded to the lower end of the joint box 10, and the side surface of the columnar member 11 on the second upper support 9 side. Cover attaching member 12. The second upper support 9 is welded to the joint box 13 bolted to the flange 2a, the columnar member 14 welded to the lower end of the joint box 13, and the side surface of the columnar member 14 on the first upper support 8 side. Cover attaching member 15.

  Each of the columnar member 11 and the columnar member 14 is made of, for example, a square steel pipe. Square steel plates are welded to the upper and lower ends of each square steel pipe. The cover attachment member 12 and the cover attachment member 15 are made of, for example, channel steel. In the present embodiment, the cover attachment member 12 on the other side (the right side in the drawing) is longer than the cover attachment member 15 on the one side (the left side in the drawing), and extends downward from the columnar member 11.

  The two side covers 16 are provided so as to overlap each other when viewed from a horizontal direction perpendicular to the extending direction of the upper beam 2 (perpendicular direction in FIG. 1; hereinafter referred to as an out-of-plane direction). a)). The two side covers 16 are welded to both side surfaces of the cover mounting member 12 and the cover mounting member 15 and face each other with a predetermined distance. The side cover 16 has a large number of circular holes for weight reduction.

  The lower frame 6 is joined to the upper surface 3a of the lower beam 3 and is made of two steel plates joined to the lower support 17 and a cantilevered lower support 17 that stands vertically upward from the lower beam 3. It has a side cover (lower cover member) 26 and a connecting plate 27 that is joined to the lower support 17 and disposed between the two side covers 26. The lower support body 17 includes a pair of first lower support body 18 and second lower support body 19 arranged with a predetermined interval in the extending direction of the lower beam 3. The first lower support 18 and the second lower support 19 are arranged in parallel to each other.

  The first lower support 18 is disposed immediately below the first upper support 8. That is, the second lower support body 19 is disposed immediately below the second upper support body 9. The distance between the first upper support 8 and the second upper support 9 is equal to the distance between the first lower support 18 and the second lower support 19.

  The first lower support 18 includes a joint box 20 bolted to the upper surface 3a of the lower beam 3, a columnar member 21 welded to the upper end of the joint box 20, and the second lower support 19 side of the columnar member 21. And a cover mounting member 22 welded to the side surface. The second lower support 19 includes a joint box 23 bolted to the upper surface 3 a of the lower beam 3, a columnar member 24 welded to the upper end of the joint box 23, and the first lower support 18 side of the columnar member 24. And a cover mounting member 25 welded to the side surface.

  Each of the columnar member 21 and the columnar member 24 is made of, for example, a square steel pipe. Square steel plates are welded to the upper and lower ends of each square steel pipe. The cover attachment member 22 and the cover attachment member 25 are made of, for example, channel steel. In the present embodiment, the cover attachment member 25 on the other (left side in the drawing) is longer than the cover attachment member 22 on the one side (shown on the right side in the drawing), and extends upward from the columnar member 24. The cover mounting member 25 and the cover mounting member 12 of the upper support 7 described above are opposed to each other in the extending direction of the upper beam 2.

  The two side covers 26 are provided at the upper ends of the first lower support 18 and the second lower support 19 so as to overlap each other when viewed from the out-of-plane direction (see FIG. 3A). The two side covers 26 are welded to both side surfaces of the cover mounting member 12 and the cover mounting member 15 and face each other with a predetermined distance. The side cover 26 has a large number of circular holes for weight reduction.

  Further, a rectangular connecting plate 27 is provided between the columnar member 21 of the first lower support 18 and the columnar member 24 of the second lower support 19. The left and right edges of the connecting plate 27 are welded to the side surfaces of the columnar member 21 and the columnar member 24 facing each other. A large number of circular holes for weight reduction are formed in the connecting plate 27.

  In the upper frame 4 and the lower frame 6 having the above-described configuration, the upper portion of the cover mounting member 25 of the second lower support 19 is the same as that of the first upper support 8 in the predetermined region A in the height direction (see FIG. 2). It faces the lower part of the cover mounting member 12. That is, the upper support body 7 and the lower support body 17 face each other in the predetermined region A in the height direction. In other words, the upper support body 7 and the lower support body 17 face each other in the extending direction of the upper beam 2. In the following description, the predetermined area A is referred to as an overlap area A.

  Here, the damping structure 1 includes an oil damper 30 including the above-described four oil dampers 30a to 30d (see FIG. 2). The oil damper 30 is disposed in the overlap region A. The oil damper 30 is joined to the damper mounting portion 31 of the cover mounting member 12 and the damper mounting portion 32 of the cover mounting member 25. The damper mounting portion 31 and the damper mounting portion 32 are located at substantially the same height.

  As shown in FIG. 3A, the oil damper 30 has a fixed portion 36 including a cylinder portion and the like joined to the cover mounting member 12, and an extendable portion 37 including a rod portion and the like joined to the cover mounting member 25. Yes. That is, the cover attachment member 12 and the cover attachment member 25 have a function of attaching the side covers 16 and 26 to the upper support 7 and the lower support 25 and a function of attaching the oil damper 30 to the upper support 7 and the lower support 25. Doubles as Each oil damper 30a-30d (refer FIG. 2) which comprises the oil damper 30 is expanded-contracted in a substantially horizontal direction between the upper support body 7 and the lower support body 17 with interlayer deformation.

  Further, as shown in FIG. 1, the distance between the upper beam 2 and the damper mounting portion 31 of the upper support 7 is shorter than the distance between the lower beam 3 and the damper mounting portion 32 of the lower support 17. . That is, the oil damper 30 is provided near the upper beam 2 between the upper beam 2 and the lower beam 3. In other words, the damper attachment portion 31 and the damper attachment portion 32 are at a position higher than the intermediate position between the upper beam 2 and the lower beam 3.

  As shown in FIG. 2, most of the overlap region A in the present embodiment overlaps the region where the damper mounting portion 31 and the damper mounting portion 32 are formed. Therefore, the overlap region A is provided near the upper beam 2 between the upper beam 2 and the lower beam 3. The overlap area A is at a position higher than the intermediate position between the upper beam 2 and the lower beam 3.

  The damper mounting portion 31 and the damper mounting portion 32 are formed at such a position, and the oil damper 30 is arranged, so that when the interlayer deformation occurs, the damper mounting portion 31 and the damper mounting portion 32 act on the upper beam 2 having lower rigidity than the lower beam 3. The bending due to the reaction force from the oil damper is reduced, and the deflection of the upper beam 2 is suppressed.

  FIG. 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. As shown in FIG. 3A, the two side covers 16 cover the oil damper 30 from both sides in the out-of-plane direction. The two side covers 26 cover the oil damper 30 from both sides in the out-of-plane direction. The width of the cover attachment member 25 to which the side cover 26 is joined is smaller than the width of the cover attachment member 12 to which the side cover 16 is joined.

  As shown in FIG. 2, the side cover 16 has a hypotenuse 16a. The side cover 26 is formed with a hypotenuse 26a. Each of the side cover 16 and the side cover 26 has an overlapping portion 16b and an overlapping portion 26b that overlap each other in the out-of-plane direction (see also FIG. 3A). The overlapping portion 16b is formed along the oblique side portion 16a. The overlapping portion 26b is formed along the oblique side portion 26a. A slight gap is formed between the overlapping portion 16b and the overlapping portion 26b.

  Next, the operation when interlayer deformation is applied to the vibration damping structure 1 will be described. For example, when a force in the right direction in FIG. 1 is applied to the upper beam 2, the upper beam 2 moves to the right with respect to the lower beam 3. Accordingly, the upper beam 2 and the upper support 7 (upper frame 4) move to the right side. At this time, the oil damper 30 (the oil dampers 30a to 30d) extends. When a leftward force in FIG. 1 is applied to the upper beam 2, the upper beam 2 moves to the left with respect to the lower beam 3. Accordingly, the upper beam 2 and the upper support 7 (upper frame 4) move to the left side. At this time, the oil damper 30 (the oil dampers 30a to 30d) is degenerated. In the event of an earthquake, energy is absorbed and vibration is attenuated by repetition of such operations.

  According to the vibration damping structure 1 of the present embodiment, the oil damper 30 joined to the damper mounting portion 31 of the upper support 7 and the damper mounting portion 32 of the lower support 17 in accordance with the interlayer deformation includes the upper support 7. And expand and contract between the lower support 17. Therefore, the force generated by the interlayer deformation can be reliably transmitted to the oil damper 30. Therefore, the oil damper 30 can be effectively expanded and contracted according to the displacement, and the vibration damping effect is enhanced. Moreover, the distance between the damper mounting portion 31 and the upper beam 2 is shorter than the distance between the damper mounting portion 32 and the lower beam 3. The upper beam 2 made of steel is lower in rigidity than the lower beam 3 made of reinforced concrete, but since the oil damper 30 is provided near the upper beam 2, the oil acting on the upper beam 2 when interlayer deformation occurs. The bending due to the reaction force from the damper is reduced, and the deflection of the upper beam 2 is suppressed. As a result, the oil damper 30 can be smoothly retracted.

  Further, when a force is applied in the direction in which the oil damper 30 is retracted, the oil damper 30 contacts the cover member 16 or the cover member 26, so that the oil damper 30 can be prevented from shaking in the out-of-plane direction. The damper 30 can be smoothly degenerated.

  Further, since the side cover 16 is joined to the upper support 7 and the side cover 26 is joined to the lower support 17, that is, the cover member is divided into two members, the upper support of the side cover 16. The take-out length from 7 and the take-out length from the lower support 17 of the side cover 26 can be reduced, and the out-of-plane shake of the oil damper 30 can be more effectively regulated.

  Further, since the side cover 16 and the side cover 26 overlap each other in the overlapping portions 16b and 26b, the upper support 7 and the lower support 7 and the lower portion due to the reaction force from the oil damper 30 when a force is applied in the direction in which the oil damper 30 is retracted. The blurring of the distal end portion (free end side) of the support 17 in the out-of-plane direction is restricted. Along with this, the blurring of the oil damper 30 in the out-of-plane direction is also restricted, and the oil damper 30 can be smoothly retracted.

  FIG. 4 is a front view of the vibration damping structure 1A according to the second embodiment. The vibration damping structure 1A shown in FIG. 4 is different from the vibration damping structure 1 shown in FIGS. 1 and 2 in that an overlapping portion is provided instead of the side cover 16 and the side cover 26 having the overlapping portion 16b and the overlapping portion 26b. The side cover 16A and the side cover 26A are not used. In this case, a gap 29 is formed between the oblique side portion 16a of the side cover 16A and the oblique side portion 26a of the side cover 26A (see also FIG. 3B).

  Also with such a damping structure 1A, the force generated by the interlayer deformation can be reliably transmitted to the oil damper 30. Further, since the oil damper 30 is provided near the upper beam 2, bending due to the reaction force from the oil damper 30 acting on the upper beam 2 when interlayer deformation occurs is reduced, and the deflection of the upper beam 2 is suppressed. Is done. As a result, the oil damper 30 can be smoothly retracted. Further, the side cover 16 </ b> A and the side cover 26 </ b> A effectively restricts the oil damper 30 from moving out of the plane.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. The overlap region A is not limited to the region where the damper attachment portion 31 and the damper attachment portion 32 are formed, and only a small part of the overlap region A is the damper attachment portion 31 and the damper attachment portion. It may overlap with the area where 32 is formed. The oil dampers 30a to 30d may be arranged in a direction other than the substantially horizontal direction. The number of oil dampers may be one, or a plurality other than four. The side cover 16 and the side cover 26 may be omitted.

  DESCRIPTION OF SYMBOLS 1,1A ... Damping structure, 2 ... Upper beam, 3 ... Lower beam, 7 ... Upper support, 17 ... Lower support, 30 ... Oil damper, 16, 16A ... Side cover (upper cover member), 16b ... Overlap Part, 26, 26A ... side cover (lower cover member), 26b ... overlapping part, 31 ... damper attachment part (first part), 32 ... damper attachment part (second part).

Claims (4)

An upper beam made of steel,
A lower beam made of reinforced concrete;
An upper support depending from the upper beam;
A lower support that stands up from the lower beam and faces the upper support in a predetermined region in the height direction;
An oil damper disposed in the predetermined region and joined to the first part of the upper support and the second part of the lower support, and expands and contracts between the upper support and the lower support in accordance with interlayer deformation. And comprising
The damping structure according to claim 1, wherein a distance between the upper beam and the first portion of the upper support is shorter than a distance between the lower beam and the second portion of the lower support.   2. The vibration damping device according to claim 1, further comprising a cover member that is joined to the upper support body or the lower support body and covers the oil damper from both sides in a horizontal direction perpendicular to the extending direction of the upper beam. Construction.   The vibration control device according to claim 2, comprising: an upper cover member that is the cover member joined to the upper support, and a lower cover member that is the cover member joined to the lower support. Construction.   4. The vibration damping structure according to claim 3, wherein the upper cover member and the lower cover member have overlapping portions that overlap each other in a horizontal direction orthogonal to an extending direction of the upper beam.

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