JP2015045216A - Earthquake control structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly relatively displace in the shear direction, without restricting a plate even when using a spacer.SOLUTION: A bolt 12 is orthogonally penetrated through a pair of first and second plates 7 and 8 for forming a viscoelastic damper, and a nut 15 is threadedly engaged via a washer 14 with the tip of the bolt 12, and while forming a penetration part of the bolt 12 in the first plate 7 as a long hole 18, the spacer 16 positioned between both plates 7 and 8 is out-fitted to the bolt 12, and a projection part 17 having the length larger than a thickness of the first plate 7 is projected on an under surface of the spacer 16, so that a clearance S for not contacting the spacer 16 and the first plate 7 in an undeformed state of a viscoelastic body 9, is set between the spacer 16 and the first plate 7.

Description

  The present invention relates to a building vibration control structure using a viscoelastic damper.

  As for the vibration control structure of a building, it is known that a pair of plates parallel to the frame surface of the frame are arranged in the frame via a brace and a viscoelastic body is bonded between the plates. Yes. That is, the viscoelastic body is shear-deformed by the relative displacement of the plate accompanying the deformation of the shaft assembly, and vibration damping is attempted. Such viscoelastic dampers are disclosed in Patent Documents 1 and 2, The plates are connected to each other with bolts and nuts to prevent the gap between the plates from being opened, and a spacer is externally mounted on the bolt between the plates to prevent the gap between the plates from being narrowed.

JP 2003-49556 A JP 2009-256957 A

  In the conventional viscoelastic damper using the bolt nut and the spacer as described above, if the nut is tightened too much, the movement of the plate is restricted by the spacer, and there is a possibility that the smooth displacement cannot be performed.

  Accordingly, an object of the present invention is to provide a vibration control structure for a building that can be smoothly displaced relatively in the shearing direction without restraining the plate even if a spacer is used.

In order to achieve the above object, the invention according to claim 1 is a viscoelastic body comprising a pair of plates parallel to the frame surface of the shaft set and a viscoelastic body bonded between the plates. A building damping structure that provides an elastic damper, causes a pair of plates to move relative to each other in the opposite direction as the shaft is deformed, and shears the viscoelastic body to produce a damping action. Bolts are passed through the pair of plates orthogonally, and nuts are screwed onto the ends of the bolts, so that the bolt penetration portions in at least one of the pair of plates are elongated holes along the shear deformation direction of the viscoelastic body. On the other hand, a spacer positioned between the pair of plates is mounted on the bolt, and the gap between the spacer and at least one of the pair of plates makes the spacer and the plate non-contact in an undeformed state of the viscoelastic body. Set up It is characterized in that the.
According to a second aspect of the present invention, in the configuration of the first aspect, the gap has at least one side of the bolt and the nut that penetrates the plate and has a protrusion projecting from the spacer with a length larger than the thickness of the plate. It is set by making it contact | abut to.
Note that “contacting at least one side of a bolt and nut” includes not only direct contact with a bolt and nut but also indirect contact via a washer.
According to a third aspect of the present invention, in the configuration of the first aspect, a washer is interposed between at least one of the bolt head and the plate and between the nut and the plate. Further, the convex portion protruding in a large length is set by penetrating the plate and contacting the spacer.
According to a fourth aspect of the present invention, in the configuration of the second aspect, a washer is interposed between at least one of the bolt head and the plate and between the nut and the plate, and the convex portion is disposed between the plate and the washer. The plate and the washer are penetrated by projecting with a length larger than the combined thickness.

According to the first aspect of the present invention, by setting the gap, the viscoelastic damper can be smoothly displaced relatively in the shear direction, and a suitable vibration control function can be exhibited.
According to the second and fourth aspects of the invention, in addition to the effect of the first aspect, the gap can be easily set by a simple shape change using a spacer.
According to the third aspect of the invention, in addition to the effect of the first aspect, the gap can be easily set by a simple shape change using a washer.

It is explanatory drawing which shows a part of horizontal construction surface of a rack warehouse. It is explanatory drawing of a viscoelastic damper, (A) shows a plane, (B) shows a front, (C) shows a side, respectively. (A) is the A section detailed drawing of FIG. 2, (B) is the B section detailed drawing of FIG. It is explanatory drawing of the viscoelastic damper which has arrange | positioned four spacers, (A) is a plane, (B) is a front, (C) shows a side surface, respectively. It is explanatory drawing of the viscoelastic damper using the spacer provided with the convex part up and down, (A) shows a plane, (B) shows a front, (C) shows a side, respectively. FIG. 6 is a detailed view of part B in FIG. 5. It is explanatory drawing of the viscoelastic damper which arrange | positioned four spacers provided with the convex part up and down, (A) shows a plane, (B) shows a front, (C) shows a side, respectively. It is explanatory drawing which shows a part of horizontal construction surface of the rack warehouse which provided the viscoelastic damper in each frame surface. It is explanatory drawing of a viscoelastic damper, (A) shows a plane and (B) shows a side surface, respectively. (A) is the A section detailed drawing of FIG. 9, (B) is the B section detailed drawing of FIG. It is explanatory drawing of the viscoelastic damper which has arrange | positioned four spacers, (A) shows a plane, (B) shows a side surface, respectively. It is explanatory drawing of the viscoelastic damper using the spacer provided with the convex part up and down, (A) shows a plane and (B) shows a side surface, respectively. (A) is the A section detailed drawing of FIG. 12, (B) is the B section detailed drawing of FIG. It is explanatory drawing of the viscoelastic damper which has arrange | positioned four spacers provided with the convex part up and down, (A) shows a plane, (B) shows a side surface, respectively. (A) is a modified example in which convex portions are provided on the lower washer, and (B) is a modified example in which convex portions are provided on the upper and lower washers. (A) is a modified example in which the spacer is divided and a convex portion is provided on the lower side, and (B) is a modified example in which the spacer is divided and a convex portion is provided on the top and bottom. 3A is a modified example of FIG. 3 in which the lower convex portion is passed through the washer, and FIG. 6B is a modified example of FIG. 6 in which the upper and lower convex portions are passed through the washer. (A) is a modified example of FIG. 16 (A) in which the spacer is divided and the lower convex portion is passed through the washer, and (B) is the spacer is divided and the convex portion provided vertically is passed through the washer. This is a modification of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a part of a horizontal plane in a rack warehouse which is an example of a building. The rack warehouse 1 has a horizontal beam 3 in a short direction between columns 2, 2. , 3..., And a longitudinal structure is connected by horizontal girders 4, 4... Via brackets 5.5. Hereinafter, in this rack warehouse 1, the left and right in FIG.

  A viscoelastic damper 6 is provided at the center of the rack warehouse 1 across the left and right frame surfaces formed by the beam members 3 and 3 and the beam members 4 and 4. As shown in FIG. 2, the viscoelastic damper 6 has a first plate 7 parallel to the frame surface bolted to the upper surface of the central beam member 3 and a predetermined interval above the first plate 7. And a second plate 8 arranged in parallel, and a viscoelastic body 9 bonded between the first plate 7 and the second plate 8. Here, the first plate 7 has an elongated plate shape in which the width on the left and right is larger than the width of the beam member 3 and protrudes to the left and right of the beam member 3 and extends in the front-rear direction. The plate 7 has a square shape having sides larger than the left and right width. Connection plates 10 and 10 are bolted to both ends of the second plate 8 projecting from the first plate 7 to the left and right, respectively, and positioned at the joints of the connection plate 10, the beam material 3 and the beam material 4. A pair of braces 11, 11 are installed in a V shape between the brackets 5, 5.

  Further, bolts 12 penetrating through the second plate 8 and the first plate 7 from above are provided on both the left and right sides of the viscoelastic body 9 through a resin washer 13 and penetrate the first plate 7. A nut 15 is screwed to the tip of the bolt 12 via a resin washer 14. Further, a resin-made spacer (for example, made of polyacetal) 16 through which the bolt 12 passes is provided between the first plate 7 and the second plate 8. As shown in FIG. 3, the spacer 16 has a circular shape in plan view that is coaxial with the bolt 12, and has a ring-shaped convex on the lower surface that penetrates the first plate 7 and is longer in the axial direction than the thickness of the first plate 7. The part 17 is projected coaxially. The lower washer 14 is in contact with the convex portion 17. As a result, gaps S are formed between the lower surface of the spacer 16 excluding the convex portion 17 and the first plate 7 and between the first plate 7 and the washer 14, respectively. And the penetration part of the convex part 17 in the 1st plate 7 is the long hole 18 extended in the front-back direction.

In the rack warehouse 1 configured as described above, when the first plate 7 and the second plate 8 to which the viscoelastic body 9 is bonded are connected by the bolt 12 and the nut 15, the bolt 12 that penetrates the second plate 8. Is passed through the spacer 16 disposed between the two plates 7 and 8 and then passed through the first plate 7, and a nut 15 is screwed onto the tip of the nut 15 via a washer 14. When tightening, the washer 14 abuts against the convex portion 17 of the spacer 16 as described above, whereby further tightening is restricted and a gap S is generated.
When the viscoelastic damper 6 is deformed in the front-rear direction during vibration due to an earthquake or the like, in the viscoelastic damper 6, the first plate 7 and the second plate 8 in which the rotational deformation is suppressed by the guide of the long hole 18 to the convex portion 17 of the spacer 16. Alternately move in the front-rear direction, and shear-deform the viscoelastic body 9 in the front-rear direction. The deformation of the viscoelastic body 9 absorbs vibration energy and causes a damping action.

  At this time, since the first plate 7 and the second plate 8 are connected by the bolts 12 and the nuts 15, the first plate 7 and the second plate 8 are held without increasing the distance between the plates 7 and 8, and no out-of-plane buckling occurs. Further, since the spacer 16 is provided between the plates 7 and 8, the distance between the plates 7 and 8 is maintained without being narrowed. In particular, the nut 17 is prevented from being over-tightened by the convex portion 17 and a gap S is provided between the spacer 16 and the first plate 7, so that even if the spacer 16 is present, the displacement of both the plates 7 and 8 is restrained. The viscoelastic body 9 is not deformed in the thickness direction.

  As described above, according to the vibration control structure of the above embodiment, the bolt 12 is passed through the pair of first and second plates 7 and 8 in an orthogonal manner, and the nut 15 is screwed into the tip of the bolt 12 via the washer 14. Then, the through portion of the bolt 12 in the first plate 7 is a long hole 18 along the shear deformation direction of the viscoelastic body 9, while the spacer 16 positioned between the plates 7 and 8 is externally mounted on the bolt 12. Then, a gap S is set between the spacer 16 and the first plate 7 so that the spacer 16 and the plate 7 are not in contact with each other when the viscoelastic body 9 is not deformed. Relative displacement can be smoothly performed in the direction, and a suitable vibration control function can be exhibited.

  In particular, here, the gap S is set by causing the convex portion 17 protruding from the spacer 16 to have a length larger than the thickness of the first plate 7 through the first plate 7 and abut against the washer 14. Therefore, the gap S can be easily set by a simple shape change using the spacer 16.

In the above embodiment, one set of bolts 12 and nuts 15, spacers 16 and the like are provided on the left and right sides of the viscoelastic body 9, but the bolts 12 and nuts provided on the left and right sides of the viscoelastic body 9 as shown in FIG. The number of sets of 15, washers 13 and 14 and spacer 16 may be two, for a total of four. It is possible to arrange more than this. In this way, the distance between the plates 7 and 8 is more reliably maintained, and rotational deformation can be suppressed more effectively.
Further, in the above embodiment, the convex portion 17 is provided only on the lower surface of the spacer 16, but as shown in FIGS. 5 and 6, the upper surface of the spacer 16 has a ring length longer than the thickness of the second plate 8. The convex portion 17 protruding in a shape may be provided coaxially so as to pass through the long hole 19 provided in the second plate 8. Also in this case, as shown in FIG. 7, two or more sets of bolts 12, nuts 15, washers 13, 14, and spacers 16 can be provided on the left and right sides of the viscoelastic body 9.

On the other hand, the structure of the viscoelastic damper is not limited to a mode in which one viscoelastic damper is provided across two frame surfaces as shown in FIG. 1, but one viscoelastic damper is provided for each frame surface as shown in FIG. Viscoelastic dampers 6A and 6A may be provided. Hereinafter, this structure will be described, but the same components as those in the previous embodiment are denoted by the same reference numerals and redundant description is omitted.
As shown in FIG. 9, the viscoelastic damper 6A uses a first plate 20 and a second plate 21 that are the same size and are rectangular, and the second plate 21 is shifted to the beam member 3 side, and the viscoelastic body 9 is sandwiched between the two plates 21 to bolt the end portions of the second plate 21 to the upper surface of the beam member 3, while the end portions of the first plate 20 are paired with each other. The braces 11 and 11 are joined to the brackets 5 and 5 of the joint portions of the beam member 3 and the girder member 4 respectively, and on the left and right sides of the viscoelastic body 9 are the washer 13 and A bolt 12 and a nut 15 are provided to connect the first plate 20 and the second plate 21 via 14, and a spacer 16 through which the bolt 12 passes is provided between the plates 20 and 21.

Each spacer 16 is formed with a convex portion 17. Here, the spacer 16 on the beam member 3 side is formed on the lower surface side, and the spacer 16 on the center side of the frame surface is formed on the upper surface side. Therefore, the penetration part of the bolt 12 of the first plate 20 is a long hole 22 that extends in the front-rear direction on the beam member 3 side, and the penetration part of the bolt 12 of the second plate 21 extends in the front-rear direction on the center side of the frame surface. A long hole 23 is formed.
As a result, in the spacer 16 on the beam member 3 side, a gap S is generated between the first plate 20 and the spacer 16 and between the first plate 20 and the washer 14 (FIG. 10), and the frame surface is located on the center side. In the spacer 16, gaps S are formed between the second plate 21 and the spacer 16 and between the second plate 21 and the washer 13, respectively.

Therefore, also in this type of vibration control structure, when the bolt 12 and the nut 15 are tightened, the washer 13 and 14 abuts on the convex portion 17 of the spacer 16 so that further tightening is restricted.
Then, when the rack warehouse 1 is deformed during vibration due to an earthquake or the like, the viscoelastic damper 6A has the first plate 20 and the first plate 20 whose rotational deformation is suppressed by the guidance of the long holes 22 and 23 to the convex portion 17 of the spacer 16. The two plates 21 are alternately moved in the front-rear direction, and the viscoelastic body 9 is shear-deformed in the front-rear direction. The deformation of the viscoelastic body 9 absorbs vibration energy and causes a damping action.

At this time, since the first plate 20 and the second plate 21 are connected by the bolt 12 and the nut 15, the first plate 20 and the second plate 21 are held without increasing the distance between the two plates 20 and 21. Moreover, since the spacer 16 is provided between both plates 20 and 21, it hold | maintains, without the space | interval of both plates 20 and 21 narrowing. In particular, the bolts 12 and the nuts 15 are prevented from being over-tightened by the projections 17 and the gaps S are provided. Therefore, even if the spacers 16 are present, the displacement of both the plates 20 and 21 is not restricted, and viscoelasticity is achieved. The body 9 is not deformed in the thickness direction.
Therefore, also in the damping structure of the said form, the viscoelastic damper 6A can be smoothly displaced relatively in a shear direction, and a suitable damping function can be exhibited.

Also in this type of vibration control structure, as shown in FIG. 11, two or more sets of bolts 12, nuts 15, spacers 16, and the like can be provided on the left and right sides of the viscoelastic body 9.
Moreover, as shown in FIGS. 12 and 13, convex portions 17 can be provided on both upper and lower surfaces of the spacer 16, or a set employing the spacers 16 having the convex portions 17 on both upper and lower surfaces is shown in FIG. Two or more sets can be provided on the left and right sides of the viscoelastic body 9.

And in common with each form, the setting of the clearance S is not limited to the structure in which the spacer is provided with a convex portion. For example, as shown in FIG. 15A, the thickness of the plate 7 (20) is set on the washer 14 side. Alternatively, the ring-shaped convex portion 14a may be integrally formed with a large length, and the convex portion 14a may be brought into contact with the spacer 16 through the long hole 18 (22). In this case, as shown in FIG. 5B, the washer 13 can also be provided with a ring-shaped convex portion 13a. Also in this case, the gap can be easily set by a simple shape change using the washers 13 and 14.
Further, as shown in FIG. 16A, the spacer is divided into a central cylindrical portion 16A that penetrates the long hole 18 (22) and abuts against the washer 14, and a ring portion 16B that is externally provided on the outer side. Is also possible. In this case, as shown in FIG. 5B, the central cylinder portion 16A can be lengthened also on the upper side and brought into contact with the washer 13, so that a gap can be set on both the upper and lower surfaces. It is also possible to integrally form the central tube portion and the washer.

Furthermore, the convex part and the center tube part of the spacer are not limited to a structure that abuts against the washer, and may be a structure that penetrates the washer and abuts against the bolt head or the nut. For example, FIG. 17A shows a modified example in which the washer 14 is provided with a through-hole 24 and a long projecting portion 17a is penetrated and brought into contact with the nut 15 in the form corresponding to FIG. Is formed longer than the total thickness of the plate 7 and the washer 14, so that the gap S can be set between the spacer 16 and the plate 7.
Similarly, in FIG. 17B, in the form corresponding to FIG. 6, the washer 13 is provided with a through hole 25 so as to penetrate the protruding portion 17 a extending long upward and contact the head of the bolt 12. This is a modified example. In these modified examples, the washers 13 and 14 can be formed of resin.

Further, in the spacer division type, in the form corresponding to FIG. 16A, as shown in FIG. 18A, the central cylindrical portion 16A extending long downward is passed through the through hole 24 provided in the washer 14. Thus, a modified example in which the nut 15 is brought into contact with the nut 15 can be considered. On the other hand, in the form corresponding to FIG. 16 (B), as shown in FIG. 18 (B), the center tube portion 16A extending long upward is passed through the through hole 25 provided in the washer 13, and the head of the bolt 12 is inserted. An example of a change to be brought into contact with the part is conceivable. Also in this case, the washers 13 and 14 can be formed of resin. However, in the spacer division type shown in FIGS. 16 and 18, the central tube portion may be made of metal.
Thus, also in the modified examples of FIGS. 17 and 18, the gap can be easily set by a simple shape change using the spacer.

However, these convex portions are not limited to a structure that is continuous in a ring shape, and may be a structure that protrudes intermittently on a concentric circle.
In addition, it is also conceivable that the spacer has an R-shaped or chamfered outer peripheral edge to reduce the sliding resistance against the plate.

On the other hand, in the said form, although the group of a bolt nut and a spacer is arrange | positioned at the both sides of the viscoelastic body of a viscoelastic damper, you may arrange | position only at one side or the position which penetrates a viscoelastic body.
In addition, the structure has viscoelastic dampers on the horizontal surface of the rack warehouse, but it may be a horizontal surface of a building other than the rack warehouse, or it may be a vertical surface instead of a horizontal surface. It is of course possible to apply the invention.

And in each said structure, although the washer is interposed between the volt | bolt and nut which connect the 1st, 2nd plate of a viscoelastic damper, when providing a convex part in a spacer, a washer is abbreviate | omitted, The convex portion provided on the spacer can be brought into direct contact with at least one of the bolt and the nut. Moreover, when providing a washer, you may form a washer with a metal.
However, the convex portion is not limited to being provided only on the spacer or on the washer, but can be provided on both the spacer and the washer.

  1 ・ ・ Rack warehouse 2 ・ ・ Columns 3 ・ ・ Beam materials 4 ・ ・ Girder materials 5 ・ ・ Brackets 6,6A ・ ・ Viscoelastic dampers 7,20 ・ ・ First plate 8,21 ・・ Second plate, 9 ・ ・ Viscoelastic body, 10 ・ ・ Connecting plate, 11 ・ ・ Brace, 12 ・ ・ Bolt, 13, 14 ・ ・ Washer, 15 ・ ・ Nut, 16 ・ ・ Spacer, 16A ・ ・ Center tube Part, 16B ... ring part, 17, 17a, 13a, 14a ... convex part, 18, 19, 22, 23 ... long hole, 24, 25 ... through hole, S ... gap.

Claims (4)

In the shaft assembly, a viscoelastic damper comprising a pair of plates parallel to the frame surface of the shaft assembly and a viscoelastic body bonded between the plates is provided, and along with the deformation of the shaft assembly during vibration , A vibration control structure of a building in which the pair of plates are moved relative to each other in the opposite direction, and the viscoelastic body is subjected to shear deformation to cause a damping action,
Bolts are passed through the pair of plates orthogonally, and nuts are screwed into the ends of the bolts, so that the bolt penetration portions in at least one of the pair of plates are aligned along the shear deformation direction of the viscoelastic body. While making it a long hole,
The bolt is provided with a spacer positioned between the pair of plates, and the spacer and the plate are not deformed between the spacer and at least one of the pair of plates in an undeformed state of the viscoelastic body. Seismic control structure of a building, characterized by setting a gap for contact.   The gap is set by causing a protrusion projecting from the spacer to have a length greater than the thickness of the plate, and passing through the plate and abutting against at least one side of the bolt and the nut. The building vibration control structure according to claim 1.   A washer is interposed between at least one of the bolt head and the plate and between the nut and the plate, and the gap protrudes from the washer with a length larger than the thickness of the plate. The building vibration control structure according to claim 1, wherein a convex portion is set by penetrating the plate and contacting the spacer.   A washer is interposed between at least one of the bolt head and the plate and between the nut and the plate, and the convex portion has a length larger than the combined thickness of the plate and the washer. The building vibration control structure according to claim 2, wherein the plate and the washer are protruded and penetrated.

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