JP2011006965A - Brace structure, and building having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress buckling of a brace.SOLUTION: The brace 16 is mounted astride an upper frame 12 and a lower frame 14 arranged adjacently in a vertical direction. A girder 24 intersecting with the brace 16 in an elevational view is provided with a restricting member. Displacement of the frames 12, 14 of a viscoelastic damper in an out-of-plane direction is restricted by the restricting member abutting a holding member of the viscoelastic damper.

Description

  The present invention relates to a brace structure and a building having the brace structure.

  Conventionally, braces provided on a frame are known. Further, there is known a vibration damping device in which a brace and a viscoelastic damper (damping mechanism) or a brace and an oil damper are coupled in series (for example, Patent Documents 1 and 2). In these vibration damping devices of Patent Documents 1 and 2, a viscoelastic damper or an oil damper is provided in the beam to widen an opening space of a frame for equipment piping, a passage, and the like.

  Here, the braces are generally provided in each layer of a building, and it takes time to attach each brace. Moreover, the damping device of patent documents 1 and 2 operates a viscoelastic damper or an oil damper using the interlayer deformation for one layer of a building. Therefore, there is a limit to efficiently using the vibration damping performance of each viscoelastic damper or oil damper as a vibration damping effect on the building.

  On the other hand, in the vibration damping structure disclosed in Patent Document 3, a brace and a steel damper (history damper) coupled in series are provided across a plurality of frames that are connected in the vertical direction. In this vibration damping structure, energy absorption efficiency by the steel material damper is improved by deforming the steel material damper using interlayer deformation for a plurality of layers.

  However, if a brace or the like is provided over a plurality of frames, the buckling length of the brace inevitably increases, and the brace is likely to buckle.

JP-A-11-166328 Japanese Patent Laid-Open No. 11-172959 JP 2006-225960 A

  In consideration of the above facts, the present invention aims to suppress buckling of braces.

  The brace structure according to claim 1 is a brace that is attached to a plurality of frames that are vertically adjacent to each other, a horizontal member that constitutes the frame and intersects the brace in an elevational view, and the horizontal member. And a buckling suppressing means for restricting displacement of the frame in the out-of-plane direction of the frame.

  According to said structure, the brace is attached ranging over several frames adjacent to an up-down direction. A buckling suppression means is provided on the horizontal member of the frame that intersects the brace in an elevational view. By this buckling suppression means, the displacement of the brace frame in the out-of-plane direction is restricted (restricted).

  Here, the brace is attached over a plurality of frames. Accordingly, since the amount of deformation of the brace is larger than when a brace is attached to each frame, the deformation efficiency per brace is improved. On the other hand, when the brace is attached across a plurality of frames, the buckling length of the brace becomes long and the brace is easily buckled. As a countermeasure against this, in the present invention, a buckling suppression means is provided on the horizontal member to regulate the displacement of the brace frame in the out-of-plane direction. Thereby, since the rigidity of the brace frame in the out-of-plane direction is increased, the buckling of the brace is suppressed.

  The brace structure according to claim 2 is the brace structure according to claim 1, wherein the brace is provided below the horizontal member, a first brace body provided above the horizontal member, and the first brace structure. A second brace body that is relatively displaced with respect to the one brace body; and a vibration damper that is coupled to the first brace body and the second brace body. The damper has a pair of regulating members disposed on both sides of the frame in the out-of-plane direction.

  According to said structure, a brace is connected with the 1st brace body provided above a horizontal member, the 2nd brace body provided below a horizontal member, a 1st brace body, and a 2nd brace body. And a vibration damper. The second brace body can be displaced relative to the first brace body. Accordingly, when an external force acts on the frame due to wind, earthquake, or the like, the first brace body and the second brace body are relatively displaced, and the vibration damper is activated. The vibration damper absorbs vibration energy.

  Here, in the present invention, braces are attached across a plurality of frames adjacent in the vertical direction. Therefore, the amount of relative displacement between the first brace body and the second brace body is larger than when a brace is attached to each frame. Therefore, the amount of deformation of the vibration damper increases, and the vibration energy absorption efficiency of the vibration damper improves.

  In addition, a pair of regulating members are provided on both sides in the out-of-plane direction of the frame of the damping damper. When this regulating member comes into contact with the damping damper, the displacement in the out-of-plane direction of the frame of the damping damper is regulated. Therefore, buckling of the first brace body and the second brace body connected to the vibration damper is suppressed.

  A brace structure according to a third aspect is the brace structure according to the second aspect, wherein the damping damper overlaps the horizontal member in an elevational view.

  According to said structure, the damping damper has overlapped with the horizontal member by the elevation view. Therefore, as compared with the conventional case where the damping damper is provided under the beam, the opening space of the frame can be secured as much as the damping damper overlaps the horizontal member.

  A brace structure according to a fourth aspect is the brace structure according to the second or third aspect, wherein the vibration damper controls a relative displacement amount between the first brace body and the second brace body. Stopper means are provided.

  According to said structure, the stopper means is provided in the damping damper. The stopper means restricts the relative displacement between the first brace body and the second brace body when a predetermined amount of relative displacement is generated between the first brace body and the second brace body. Thereby, a 1st brace body and a 2nd brace body resist external force, such as an earthquake, and exhibit seismic performance. Therefore, for example, while the minute vibrations such as wind and traffic vibrations are absorbed by the vibration damper, the first brace body and the second brace body can function as seismic elements during a large earthquake. Therefore, it is possible to improve the living performance while ensuring the earthquake resistance.

  The brace structure according to claim 5 is the brace structure according to any one of claims 2 to 4, wherein the damping damper is fixed to the first brace body; A second holding member fixed to the two brace body and facing the first holding member; and a viscoelastic body held between the first holding member and the second holding member.

  According to the above configuration, the vibration damper is held between the first holding material, the second holding material facing the first holding material, and the first holding material and the second holding material. Viscoelastic body. The first holding material is fixed to the first brace body, and the second holding material is fixed to the second brace body. That is, the second holding material can be relatively displaced with respect to the first holding material. Therefore, when an external force such as wind or earthquake acts on the frame and the first holding member and the second holding member are relatively displaced, the viscoelastic body held between the first holding member and the second holding member is Shears and absorbs vibration energy.

  A brace structure according to a sixth aspect is the brace structure according to any one of the second to fifth aspects, wherein a sliding means is provided on at least one of the contact surfaces of the regulating member and the vibration damper.

  According to said structure, the sliding means is provided in at least one of the contact surfaces of a control member and a damping damper. By this sliding means, the frictional force generated on the contact surface between the damping damper and the regulating member is reduced. That is, as compared with the case where no sliding means is provided, the regulating member does not hinder the deformation of the damping damper. Therefore, it is possible to improve the damping performance of the damping damper while suppressing buckling of the first brace body and the second brace body.

  Further, by reducing the frictional force generated on the contact surface between the damping damper and the regulating member, the stress (axial force, bending moment, etc.) generated on the regulating member and the horizontal member can be reduced.

  The building of Claim 7 has the brace structure of any one of Claims 1-6.

  According to said structure, buckling of a brace can be suppressed by having the brace structure of any one of Claims 1-6. Therefore, it is possible to construct a building with improved seismic performance and vibration control performance.

  Since this invention set it as said structure, the buckling of a brace can be suppressed.

It is an elevational view showing a frame to which the brace structure according to the first embodiment of the present invention is applied. It is an expansion perspective view which shows the cross | intersection part of the brace and beam which concerns on 1st Embodiment of this invention. It is an expansion perspective view which shows the cross | intersection part of the brace and beam which concerns on 1st Embodiment of this invention. (A) is a sectional view taken along line 1-1 in FIG. 1, and (B) is an enlarged view of FIG. 4 (A). It is an elevation view which shows the deformation | transformation state of the brace which concerns on 1st Embodiment of this invention. It is an enlarged view of Drawing 5 showing the operation state of the damping damper concerning a 1st embodiment of the present invention, (A) is the state before an operation, and (B) is the state after an operation. (A) And (B) is a figure which shows the modification of 1st Embodiment of this invention, and is sectional drawing equivalent to 1-1 sectional drawing of FIG. It is a figure which shows a modification in 1st Embodiment of this invention, and is sectional drawing equivalent to the 1-1 sectional view taken on the line of FIG. It is a figure which shows a modification in 1st Embodiment of this invention, and is an elevation view which shows the cross | intersection part of a brace and a horizontal member. (A) is an elevation view showing a part of a frame to which a brace structure according to a second embodiment of the present invention is applied, and (B) is a sectional view taken along line 9-9 of FIG. 10 (A). It is a disassembled perspective view of the brace and beam which concern on 2nd Embodiment of this invention. It is an elevation view which shows a modification in 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the brace structure according to the first embodiment will be described.

1, 2, and 3 show building frames 12 and 14 to which the brace structure according to the first embodiment is applied. Braces 16 are attached to these frames 12 and 14. The frame 12 (hereinafter referred to as “upper frame 12”) is constructed on the frame 14 (hereinafter referred to as “lower frame 14”). A plurality of beams 22, 24, and 26 are installed on the columns 18 and 20 constituting the upper frame 12 and the lower frame 14, and the upper frame 12 includes the columns 18 and 20 and the beams 22 and 24. Reference numeral 14 is composed of columns 18 and 20 and beams 24 and 26. The upper frame 12 and the lower frame 14 share the columns 18 and 20 and the beam 24. Moreover, the pillars 18 and 20 are comprised with the square steel pipe, and the beams 22 and 26 are comprised with the H-section steel. In addition, although illustration is abbreviate | omitted, concrete slabs are constructed | assembled suitably on the beams 22, 24, and 26, respectively.
The columns 18 and 20 are not limited to square steel pipes, and may be cylindrical steel pipes. Further, the beams 22 and 26 are not limited to the H-shaped steel, but may be an I-shaped steel.

  2 and 3, the beam 24 (horizontal member) is formed by joining two beam members 28 and 30 made of H-shaped steel and a pair of connecting beam members 32 and 34 made of C-shaped steel. Has been. The beam member 28 is bonded to the column 18, and the beam member 30 is bonded to the column 20. Further, the beam member 28 and the beam member 30 are arranged with a gap in the material axis direction (arrow B direction) of the beam 24, and a viscoelasticity described later is provided between the beam member 28 and the beam member 30. A damper 42 (vibration damper) is disposed. The connecting beam members 32 and 34 are provided on both ends of the facing beam members 28 and 30 from both sides in the out-of-plane direction of the frames 12 and 14 (direction perpendicular to the frame surfaces of the frames 12 and 14 (arrow A direction)). They are superposed and joined by welding or the like.

  The brace 16 is disposed in a space surrounded by the beam members 28 and 30 and the connecting beam members 32 and 34 (hereinafter referred to as “accommodating portion 36”). The brace 16 is attached across the upper frame 12 and the lower frame 14 adjacent in the vertical direction, and intersects the beam 24 in an elevational view. At the intersection between the brace 16 and the beam 24, a part of the brace 16 is disposed in the accommodating portion 36 of the beam 24, that is, the brace 16 penetrates the beam 24. Note that the brace 16 and the beam 24 are edged in the material axis direction of the beam 24.

  The brace 16 includes a steel brace body 38 (first brace body) provided above the beam 24, a steel brace body 40 (second brace body) provided below the beam 24, and these steel brace bodies 38. And a viscoelastic damper 42 connected to the steel brace body 40. The steel brace body 38 is a V-type brace obtained by joining two H-shaped steels 38A and 38B to a V-shape, with the joint (the top of the V-shape) between the H-shaped steel 38A and the H-shaped steel 38B facing downward. It is arranged on the surface of the upper frame 12. The top portion of the steel brace body 38 is a connecting portion 38C to which the viscoelastic damper 42 is connected. One end of the H-shaped steel 38 </ b> A is fixed to the joint between the column 18 and the beam 22, and one end of the H-shaped steel 38 </ b> B is fixed to the joint between the column 20 and the beam 22.

  The steel brace body 40 is an A-type brace obtained by connecting two H-shaped steels 40A and 40B to an A-type (reverse V-type), and a joint portion (the top of the A-type) between the H-shaped steel 40A and the H-shaped steel 40B. ) Is placed on the surface of the lower frame 14. The top part of the steel brace body 40 is a connecting part 40C to which the viscoelastic damper 42 is connected. One end of the H-section steel 40A is fixed to the joint between the column 18 and the beam 26, and one end of the H-section steel 40B is fixed to the joint between the column 20 and the beam 26. Note that the joint between the H-shaped steel 38A and the H-shaped steel 38B and the joint between the H-shaped steel 40A and the H-shaped steel 40B are reinforced by the rib plate 44.

  For joining the H-shaped steels 38A and 38B and the H-shaped steels 40A and 40B to the frames 14 and 16, a general brace joining structure can be applied. For example, welding joints may be used. The end portions of the H-section steels 38A and 38B or the H-section steels 40A and 40B may be friction-joined to the gusset plates provided in the above with high strength bolts. Moreover, you may crimp-join using a PC steel wire, a PC steel rod, etc. Further, the H-shaped steels 38A and 38B are not limited to the joint portion, and may be joined only to the beam 22 or may be joined only to the columns 18 and 20. Similarly, the H-section steels 40A and 40B may be joined only to the beam 26, or may be joined only to the columns 18 and 20.

  As shown in FIGS. 4A and 4B, the steel brace body 38 and the steel brace body 40 are connected by a viscoelastic damper 42 disposed between the steel brace bodies 38, 40. Has been. The viscoelastic damper 42 is disposed in the accommodating portion 36 of the beam 24 and overlaps the beam 24 in an elevational view (out-of-plane direction A). The viscoelastic damper 42 includes an upper member 46 and a lower member 48 that form a pair. The upper member 46 includes a steel plate 46A joined to the connecting portion 38C of the steel brace body 38, and a plurality (three in the present embodiment) of holding members 46B (first holding members) provided on the steel plate 46A. I have. The holding member 46B formed in a plate shape protrudes from the lower surface of the steel plate 46A arranged substantially horizontally, and is arranged with an interval in the out-of-plane direction of the frames 12 and 14.

  The lower member 48 includes a steel plate 48A joined to the connecting portion 40C of the steel brace body 40, and a plurality (two in the present embodiment) of holding members 48B (second holding members) provided on the steel plate 48A. It has. The holding member 48B formed in a plate shape protrudes from the upper surface of the steel plate 48A arranged substantially horizontally, and is arranged with a gap in the out-of-plane direction of the frames 12 and 14. The upper member 46 and the lower member 48 are combined such that the holding members 46B and 48B are alternately arranged in the out-of-plane direction of the frames 12 and 14. Note that at least one holding member 46B, 48B may be provided. The holding members 46B and 48B only need to hold the viscoelastic body 50, and the shape thereof is not limited to a plate shape. For example, a member having unevenness and protrusions on the surface for improving the integrity with the viscoelastic body 50 may be used.

  A plate-like viscoelastic body 50 is provided between the holding material 46B and the holding material 48B. The viscoelastic body 50 is fixed to the holding material 46B and the holding material 48B by vulcanization adhesion or the like. Through holes are formed in the viscoelastic body 50 and the holding members 46B and 48B, respectively, and the upper member 46 and the lower member 48 are connected by bolts 52 (stopper means) and nuts 54 that pass through these through holes. Has been.

  Here, the through-hole 56 (stopper means, see FIG. 6A) formed in the holding member 46B is a long hole extending in the material axis direction of the beam 24, and the inside of the through-hole 56 has a bolt 52. The shaft is movable. Thus, the upper member 46 and the lower member 48 are connected so as to be relatively displaceable in the direction of the material axis of the beam 24 within the range allowed by the through hole 56, and are held between the holding material 46B and the holding material 48B. The viscoelastic body 50 can be deformed (shear deformation). On the other hand, when the relative displacement between the upper member 46 and the lower member 48 increases (exceeds a predetermined value) and the bolt 52 hits the inner wall of the through hole 56, the relative displacement between the upper member 46 and the lower member 48 is restricted. (Restricted). The upper limit value (predetermined value) of the relative displacement amount between the upper member 46 and the lower member 48 is adjusted by increasing or decreasing the horizontal length of the through hole 56 (the length of the beam 24 in the material axis direction). . In other words, the timing at which the stopper means operates is determined by the length of the through hole 56 in the horizontal direction.

  Although not shown, the through holes formed in the holding material 48 </ b> B and the viscoelastic body 50 are also elongated holes extending in the material axis direction of the beam 24, similarly to the through holes 56. Note that it is sufficient that at least one of the through holes formed in the holding material 46B and the holding material 48B is a long hole extending in the material axis direction of the beam 24, whereby the upper member 46 and the lower member 48 are separated. The beams 24 are connected so as to be capable of relative displacement in the material axis direction. In the present embodiment, the upper member 46 and the lower member 48 are connected by the bolt 52, but may be connected using a shear pin or the like.

  The bolts 52 may be appropriately provided as necessary, but the point (intersection) where the material axes (extension lines of the material axes) of the H-section steel 38A and the H-section steel 38B intersect with the H-section steel 40A and It is desirable to connect the upper member 46 and the lower member 48 at a position where the point (intersection point) where the material axis of the H-shaped steel 40B intersects (the extension line of the material axis) coincides or around the point. If the intersection of the material axes of the H-section steel 38A and the H-section steel 38B and the intersection of the material axes of the H-section steel 40A and the H-section steel 40B are deviated, an eccentric moment corresponding to the distance between these intersections is generated. Because. Needless to say, the upper member 46 and the lower member 48 may be connected at a position other than the position where the above-mentioned intersections coincide.

On both sides in the out-of-plane direction of the frames 12 and 14 of the viscoelastic damper 42, restriction members 58 (buckling suppression means) are respectively arranged. The regulating member 58 made of a steel plate is disposed to face the holding member 46B on the outermost side of the upper member 46, and is a screw member 60 (buckling suppression means) attached to the screw holes of the connecting beam members 32 and 34. Is supported by. A disc-shaped end plate 62 (see FIG. 4B) provided at the tip of the screw member 60 is rotatably fitted in a cylindrical mounting portion 64 provided in the regulating member 58. The screw member 60 has a function as an adjusting means, that is, the distance between the holding member 46B of the upper member 46 and the regulating member 58 can be adjusted by the screwing amount of the screw member 60. The regulating member 58 is held in contact with the holding material 46B. The displacement of the upper member 46 in the out-of-plane direction of the frames 12 and 14 is restricted (restricted) by the restriction member 58, that is, the displacement of the braces 16 in the out-of-plane direction of the frames 12 and 14 is restricted. The opening diameter of the attachment portion 64 is smaller than the diameter of the end plate 62 so that the end plate 62 does not come out. Further, the beam 24 and the viscoelastic damper 42 are cut in the direction of the material axis of the beam 24.
In addition, after adjusting the distance between the holding material 46B and the regulating member 58, the regulating member 58 and the screw member 60 may be integrated by welding or the like. In the present embodiment, one restriction member 58 is supported by the two screw members 60, but a restriction member may be provided for each screw member 60. Furthermore, the attachment portion 64 may be provided as necessary and can be omitted as appropriate. For example, when a restriction member is provided for each screw member 60, the screw member 60 and the restriction member are integrated by welding or the like, and the distance between the holding member 46B and the restriction member 58 is set while rotating the restriction member together with the screw member 60. You may adjust it.

  In this embodiment, the regulating member 58 is brought into contact with the holding material 46B, but a gap may be provided between the holding material 46B and the regulating member 58. In this case, when the holding material 46B that protrudes in the out-of-plane direction of the frame 12 hits the regulating member 58, the displacement in the out-of-plane direction of the frames 12 and 14 of the holding material 46B and the steel brace bodies 38 and 40 is regulated. The

  Next, the operation of the brace structure according to the first embodiment will be described.

  FIG. 5 shows a deformed state of the brace 16 at the time of the earthquake. 6 (A) and 6 (B) are enlarged views of FIG. 5, and FIG. 6 (A) shows a state before the operation of the viscoelastic damper 42, and FIG. 6 (B) shows the state. Shows the state after the operation of the viscoelastic damper 42. Since the figure is complicated, the connecting beam members 32 and 34 are omitted in FIG. 5, and only the outer shape of the connecting beam members 32 and 34 is indicated by a two-dot chain line in FIGS. 6A and 6B. ing.

When an interlayer deformation occurs in the upper frame 12 and the lower frame 14 due to an external force such as a wind or an earthquake, a relative displacement corresponding to two layers of interlayer deformation is generated between the beam 22 of the upper frame 12 and the beam 26 of the lower frame 14. Occurs. Further, the steel brace body 38 attached to the joint portion of the beam 22 behaves integrally with the beam 22, and the steel brace body 40 attached to the joint portion of the beam 26 behaves integrally with the beam 26. the relative displacement between the brace member 38 and the steel brace member 40 (arrow B ₁ direction) occurs. In other words, the steel brace body 40 is relatively displaced with respect to the steel brace body 38. As a result, the viscoelastic damper 42 connected to the connecting portion 38C of the steel brace body 38 and the connecting portion 40C of the steel brace body 40 operates, and vibration energy is absorbed. Specifically, the upper member 46 joined to the connecting portion 38 </ b> C and the lower member 48 joined to the connecting portion 40 </ b> C are relatively displaced within a range in which the through hole 56 allows the movement of the bolt 52. Thereby, the viscoelastic body 50 provided between the holding material 46B and the holding material 48B undergoes shear deformation, and vibration energy is converted into thermal energy, thereby reducing vibration.
Although not described, even if the steel brace member 38 and the steel brace member 40 are relatively displaced in the opposite direction (opposite direction of the arrow B ₁ direction), and the viscoelastic body 50 is shear deformation in the same manner as described above, Vibration energy is converted into thermal energy, and vibration is reduced.

  On the other hand, when the amount of relative displacement between the upper member 46 and the lower member 48 increases (reaches a predetermined value) and the bolt 52 connecting the upper member 46 and the lower member 48 hits the inner wall of the through hole 56, The relative displacement between the member 46 and the lower member 48 is restricted. Thereby, the steel brace body 38 and the steel brace body 40 thereby resist external forces such as wind and earthquake, and exhibit seismic performance.

  Therefore, while the micro-vibration such as wind and traffic vibration is absorbed by the viscoelastic damper 42, the steel brace body 38 and the steel brace body 40 can function as an earthquake-resistant element during a large earthquake. Therefore, it is possible to improve the living performance while ensuring the earthquake resistance.

Further, the viscoelastic damper 42 is disposed in the accommodating portion 36 of the beam 24. Therefore, a wide opening space for the upper frame 12 and the lower frame 14 can be secured by the amount that the viscoelastic damper 42 and the beam 22 overlap in an elevational view. Therefore, it becomes easy to provide facility piping / wiring and entrance / exit, and the design freedom of the building is improved.
In the present embodiment, the entire viscoelastic damper 42 overlaps the beam 24 in an elevational view, but it is sufficient that at least a part of the viscoelastic damper 42 overlaps the beam 24 in an elevational view. Thereby, the opening space of the frames 12 and 14 can be widened. However, the viscoelastic damper 42 and the beam 24 do not necessarily overlap in an elevational view.

  In addition, the beam is generally designed so as not to bear the axial force. In the conventional damping device (for example, Patent Documents 1 and 2), the axial force acting on the brace during an earthquake is a viscoelastic damper or It is transmitted as axial force to the beam with built-in oil damper. Therefore, since the axial strength and bending strength of the beam are reduced, it is necessary to use a material having a high design strength or a beam having a large cross section. On the other hand, the beam 24 and the brace 16 according to the present embodiment are cut at the edges in the material axis direction of the beam 24, so that the axial force acting on the brace 16 during an earthquake is not transmitted to the beam 24. That is, the beam 24 is not a transmission path for the axial force borne by the brace 16. Therefore, it is possible to design a material having a low design strength or a beam 24 having a small cross section as compared with the prior art.

  Further, the brace 16 is attached across the upper frame 12 and the lower frame 14. Therefore, a relative displacement corresponding to the interlayer deformation of two layers occurs between the upper member 46 and the lower member 48 constituting the viscoelastic damper 42. Therefore, the amount of deformation of the viscoelastic body 50 is increased as compared with the case where the brace 16 is attached to each of the upper frame 12 and the lower frame 14, so that the vibration damping performance of the viscoelastic damper 42 is improved. Furthermore, by improving the vibration damping performance of the viscoelastic damper 42, the number of braces 16 installed in the building can be reduced. Therefore, the workability is improved and the construction period can be shortened.

  Here, when the braces are attached across a plurality of frames, the buckling length of the braces becomes long and the buckling strength of the braces becomes small. In this embodiment, the frames 12 and 14 of the viscoelastic damper 42 are out of the plane. Restricting members 58 are provided on both sides in the direction. Since the displacement in the out-of-plane direction of the frames 12 and 14 of the viscoelastic damper 42 is regulated by the regulating member 58, the buckling strength of the brace 16 is increased. Accordingly, the seismic performance of the brace 16 is improved. Furthermore, the brace 16 having a small cross section can be designed as compared with the prior art, and the brace 16 can be made compact. Therefore, the aperture ratio (opening space) of the frames 12 and 14 can be increased.

  Further, since the distance between the viscoelastic damper 42 and the regulating member 58 can be adjusted by the screw member 60, the installation of the viscoelastic damper 42 is facilitated and the workability is improved. Further, the screw member 60 is adjusted, and the regulating member 58 is pressed and sandwiched between the viscoelastic dampers 42 from both sides of the viscoelastic dampers 42 so that the displacement of the frames 12 and 14 of the viscoelastic dampers 42 in the out-of-plane direction is further increased. It can be tightly regulated. Thereby, the buckling suppression effect of the brace 16 can also be improved.

  Although the force that the brace 16 tries to protrude in the out-of-plane direction of the frame 12 is very small with respect to the axial force acting on the brace 16, the regulating member 58 and the connecting beam that supports the regulating member 58 are included. The materials 32 and 34 may be appropriately reinforced as necessary. For example, as shown in FIG. 7 (A), one or a plurality of webs 32A, 34A of the connecting beam members 32, 34 along the longitudinal direction of the connecting beam members 32, 34 (in FIG. 7A, Two ribs 66 may be provided to increase the out-of-plane rigidity of the web 32A. Further, as shown in FIG. 7B, instead of the C-shaped steel connecting beam members 32 and 34, connecting beam members 68 and 70 having a closed cross section such as a square steel pipe may be used. In this case, the out-of-plane rigidity of the connecting beam members 68 and 70 is increased as compared with the opening cross section of C-shaped steel or the like, and the buckling suppression effect of the regulating member 58 can be enhanced. Further, the ends of the small beams installed in the out-of-plane direction of the frames 12 and 14 may be abutted against the connecting beam members 32 and 34 for reinforcement.

  In the present embodiment, the viscoelastic damper 42 is used as the vibration damper, but the present invention is not limited to this. For example, a friction damper, an oil damper, a steel damper, an elastic-plastic damper, or the like can be used.

  Further, in the present embodiment, the steel brace body 38 being provided above the beam 24 means that the steel brace body 38 is attached to a member (for example, a column, a beam, a slab, etc.) above the beam 24. The steel brace body 38 may partially overlap the beam 24 in the out-of-plane direction of the frames 12 and 14. Similarly, that the steel brace body 40 is provided below the beam 24 means that the steel brace body 38 is attached to a member (for example, a column, a beam, a slab, etc.) below the beam 24. The brace body 40 may partially overlap the beam 24 in the out-of-plane direction of the frames 12 and 14.

  Next, a modification of the restricting member according to the first embodiment will be described.

  As shown in FIG. 8, a sliding material 72 (sliding means) is provided on the contact surface of the regulating member 58 with the holding material 46B. The sliding material 72 reduces the frictional force generated between the regulating member 58 and the holding material 46B, and the holding material 46B is easily displaced in the material axis direction of the beam 24 with respect to the regulating member 58. . Therefore, the relative displacement amount between the upper member 46 and the lower member 48 is increased, and the vibration energy absorption effect by the viscoelastic body 50 is increased. Furthermore, the stress (axial force, bending moment, etc.) which generate | occur | produces in the control member 58, the screw member 60, and the connection beam materials 32 and 34 by reducing the frictional force which generate | occur | produces on the contact surface of the control member 58 and the holding material 46B. ) Can be made small, and it is possible to design a material having a small design strength, or a regulating member 58, a screw member 60, and connecting beam members 32, 34 having a small cross section.

  As the sliding material 72, for example, tetrafluoroethylene (PTFE), polyamide, polyethylene, stainless steel, Teflon (registered trademark), paint, or the like can be used. The sliding means includes not only the case where the sliding member 72 is provided, but also the case where the regulating member 58 or the holding member 46B is formed of a low friction material such as stainless steel. In addition, the sliding means should just be provided in at least one of the contact surfaces of the control member 58 and the holding material 46B.

  Next, a modification of the brace according to the first embodiment will be described.

  The brace 16 of the first embodiment is configured by connecting the steel brace bodies 38 and 40 and the viscoelastic damper 42 in series, but the viscoelastic damper 42 can be omitted as appropriate. Specifically, as shown in FIG. 9, the brace 76 includes a steel brace body 38, a steel brace body 40, and a connecting member 78 connected to these steel brace bodies 38, 40. . The connecting member 78 is made of a steel plate and is reinforced by ribs 82 provided on the outer periphery of the connecting member 78. A plate-shaped regulating member 80 is applied to the connecting member 78 from both sides of the frame 12 in the out-of-plane direction. In addition, although illustration is abbreviate | omitted, the control member 80 is supported by the connection beam material 32 (refer FIG. 4 (A)) with the screw member 60. FIG.

  In this way, by regulating the displacement in the out-of-plane direction of the frames 12 and 14 of the connecting member 78 by the regulating member 80, the buckling strength of the brace 76 is increased, and the buckling of the brace 76 can be suppressed. . In addition, you may provide energy absorption performance to the brace 76 by forming the connection member 78 with low yield point steel (for example, LY225 etc.). In other words, the coupling member 78 may be shear-deformed by the relative displacement generated between the steel brace body 38 and the steel brace body 40, and vibration energy may be absorbed by the hysteresis loop of the steel material.

  Next, a brace structure according to the second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  FIG. 10A shows the lower part of the upper frame 12 and the upper part of the lower frame 14 to which the brace structure according to the second embodiment is applied. A brace 86 is attached to the upper frame 12 and the lower frame 14. This brace 86 is H-shaped steel, and is attached over the upper frame 12 and the lower frame 14, and intersects the beam 88 shared by the upper frame 12 and the lower frame 14 in an elevational view. Although not shown, the upper end of the brace 86 in the material axis direction is fixed to the joint of the column 20 and the beam 22 (see FIG. 1), and the lower end of the brace 86 in the material axis direction is the column 18 and the beam. 26 (see FIG. 1).

  As shown in FIGS. 10B and 11, the beam 88 shared by the upper frame 12 and the lower frame 14 is an H-section steel. The beam 88 and the brace 86 are disposed so as to overlap with the out-of-plane direction of the frames 12 and 14 (in the direction of arrow C in FIG. 11) at the longitudinal center of the beam 88. A regulating member 90 (buckling suppression means) is provided between the web 88A of the beam 88 and the web 86A of the brace 86. The beam 88 and the brace 86 are arranged with a gap in the out-of-plane direction of the frames 12 and 14 in order to absorb construction errors.

  The restricting members 90 are made of square steel pipes and are arranged side by side in the material axis direction of the brace 86. A regulating member 92 is provided on the opposite side of the regulating member 90 with the web 86A of the brace 86 therebetween. That is, the restricting members 90 and 92 are disposed on both sides in the out-of-plane direction of the frames 12 and 14 of the brace 86, respectively. The restricting member 92 is made of a steel plate. Through holes 100, 102, 104, and 106 (see FIG. 11) are formed in the webs 86A and 88A and the regulating members 90 and 92, respectively, and bolts that pass through these through holes 100, 102, 104, and 106 are formed. The beam 88 and the brace 86 are connected by 94 and a nut 96. The restriction members 90 and 92 restrict displacement of the braces 86 in the out-of-plane direction of the frames 12 and 14.

  Further, the through holes 100 and 102 formed in the webs 86A and 88A are elongated holes extending in the material axis direction (arrow D direction) of the beam 88, and the shaft portion of the bolt 94 is formed in the through holes 100 and 102. Is movable. As a result, the beam 88 and the brace 86 can be relatively displaced in the material axis direction of the beam 88 within a range allowed by the through holes 100 and 102. In consideration of the displacement amount of the brace 86 in the earthquake or the like (the displacement amount in the material axis direction of the beam 88), these through holes 100 and 102 do not contact the inner walls of the through holes 100 and 102 and the shaft portion of the bolt 94. It is like that. That is, the beam 88 and the brace 86 are edged in the direction of the material axis of the beam 4 within the range allowed by the through holes 100 and 102, so that the axial force acting on the brace 86 is not transmitted to the beam 88. It has become.

  Next, the operation of the brace structure according to the second embodiment will be described.

  When an interlayer deformation occurs in the upper frame 12 and the lower frame 14 due to an external force such as wind or earthquake, the brace 86 resists the external force and exhibits seismic performance. The brace 86 is attached across the upper frame 12 and the lower frame 14. Therefore, since the deformation (axial strain) corresponding to the interlayer deformation of two layers occurs in the brace 86, the deformation efficiency per brace 86 is improved. Further, by improving the performance of the braces 86, the number of braces 16 installed in the building can be reduced. Therefore, the construction period can be shortened.

  In addition, since the brace 86 and the beam 88 are edged in the material axis direction of the beam 88 within the range allowed by the through holes 100 and 102, the axial force acting on the brace 86 is not transmitted to the beam 88. . Therefore, it is possible to design a material having a low design strength or a beam 88 having a small cross section. As in the first embodiment, sliding means (for example, the sliding material 72 in FIG. 7) may be provided on at least one of the contact surfaces of the regulating members 90 and 92 and the brace 86. Thereby, the frictional force generated between the restricting members 90 and 92 and the brace 86 is reduced, and the stress generated in the beam 88 by the frictional force can be reduced.

  Further, restriction members 90 and 92 are provided on both sides in the out-of-plane direction of the frames 12 and 14 of the brace 86. Since the displacement of the braces 86 in the out-of-plane direction is restricted by the restricting members 90 and 92, the buckling strength of the brace 86 is increased. Therefore, the energy absorption capability of the brace 86 is not impaired.

The shapes and sizes of the regulating members 90 and 92 are not limited to those described above. For example, H-shaped steel, T-shaped steel, C-shaped steel or the like can be used instead of the regulating member 90 as long as the displacement can be regulated in the out-of-plane direction of the brace 86. Further, a viscoelastic body may be provided between the regulating members 90 and 92 and the web 86 </ b> A to impart energy absorption performance to the brace 86.
Furthermore, in the present embodiment, the beam 88 and the brace 86 are arranged with a space therebetween in the out-of-plane direction of the frames 12 and 14. The displacement of 86 frames 12 and 14 in the out-of-plane direction may be restricted.

  The first and second embodiments can be applied to X-type braces and single-flow braces as described above. Further, the braces 16, 76, 86 and the beams 24, 88 only need to intersect in an elevational view, and are not limited to the above-described configuration. For example, in the first embodiment, the brace 16 is passed through the beam 24, but the brace 16 may be disposed on one side of the beam 24 as in the second embodiment (see 9B). In the second embodiment, braces 86 may be disposed on both sides of the beam 88 and the braces 86 and the beam 88 may be connected by the regulating members 90 and 92. Further, the brace 86 may be bifurcated at an intermediate portion of the brace 86, and a beam 88 may be disposed between the branched braces.

  In the first and second embodiments, the braces 16, 76, 86 are attached across the upper frame 12 and the lower frame 14, but the present invention is not limited to this. These braces 16, 76, 86 may be attached across two or more frames that are adjacent in the vertical direction. At this time, a buckling prevention means such as a regulating member 58 may be provided on a horizontal member (beam or slab) where the braces 16, 76, 86 intersect in an elevational view. In addition, when the braces 16, 76, 86 intersect with a plurality of horizontal members (beams or slabs) in an elevational view, at least one horizontal member may be provided with a buckling prevention means.

  Furthermore, the braces 16, 76, 86 can be mounted across the frames adjacent in the vertical direction and also across the frames adjacent in the horizontal direction. For example, as shown in FIG. 12, the brace 16 is attached to four frames 112, 114, 116, 118 adjacent vertically and horizontally. The frames 112 and 114 are constituted by columns 120 and 122 and beams 130, 132, and 134 laid between the columns 120 and 122, and the frames 116 and 118 are formed by the columns 122 and 124 and these columns. It is comprised by the beams 136, 138, and 140 constructed between 122,124. The brace 16 intersects with the beam 132 in an elevational view, and the beam 132 is provided with a regulating member (not shown) as a buckling prevention means. In the configuration shown in FIG. 12, the H-shaped steels 38A and 40A penetrate the pillar 122, but the H-shaped steels 38A and 40A are bifurcated at the middle portion of the H-shaped steels 38A and 40A. You may arrange | position the pillar 122 between braces.

  In the first and second embodiments, the steel frame upper frame 12 and the lower frame 14 have been described as an example. Furthermore, various methods such as an on-site method and a precast method can be used. Further, a slab may be used instead of the beams 24 and 88. In addition, pillar

  Furthermore, the brace structure according to the first and second embodiments can be applied to new buildings and renovated buildings having various structures such as a seismic structure and a seismic isolation structure. By applying these brace structures, it is possible to construct a building with improved seismic performance and vibration control performance.

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and the first and second embodiments may be used in combination. Of course, various embodiments can be implemented without departing from the scope of the invention.

12 Upper frame (frame)
14 Lower frame (frame)
16 Brace 24 Beam (horizontal member)
38 Steel brace body (first brace body)
40 Steel brace body (second brace body)
42 Viscoelastic damper (vibration damper)
46B Holding plate 48B Holding plate 50 Viscoelastic body 52 Bolt (stopper means)
56 Through hole (stopper means)
58 Regulating member (Buckling suppression means)
60 Screw member (buckling suppression means)
72 Sliding material (sliding means)
86 Brace 88 Beam (horizontal member)
90 Regulating member (buckling suppression means)
92 Restriction member (Buckling suppression means)
Arrow A Out-of-plane direction of frame

Claims (7)

Braces attached across a plurality of frames adjacent in the vertical direction;
A horizontal member constituting the frame and intersecting the brace in an elevational view;
Buckling suppression means provided on the horizontal member for regulating displacement of the frame in the out-of-plane direction of the frame;
Brace structure with The brace is
A first brace body provided above the horizontal member;
A second brace body that is provided below the horizontal member and is relatively displaced with respect to the first brace body;
A vibration damper connected to the first brace body and the second brace body;
Have
The brace structure according to claim 1, wherein the buckling suppression means has a pair of restricting members disposed on both sides of the frame of the vibration damper in the out-of-plane direction.   The brace structure according to claim 2, wherein the vibration damper is overlapped with the horizontal member in an elevational view.   The brace structure according to claim 2 or 3, wherein the damping damper is provided with stopper means for restricting a relative displacement amount between the first brace body and the second brace body. The damping damper is
A first holding member fixed to the first brace body;
A second holding member fixed to the second brace body and facing the first holding member;
A viscoelastic body held between the first holding material and the second holding material;
The brace structure according to any one of claims 2 to 4, comprising:   The brace structure according to any one of claims 2 to 5, wherein a sliding means is provided on at least one of the contact surfaces of the regulating member and the damping damper.   The building which has the brace structure of any one of Claims 1-6.

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