JP5405062B2 - Vibration-damping studs using viscoelastic dampers and buckling-restrained braces - Google Patents

Description

  The present invention relates to a vibration damping stud that uses a buckling restraint brace and a viscoelastic damper that are incorporated in a building framework and used to absorb energy loaded on the building in traffic vibrations or earthquakes.

  As vibration control means used in buildings consisting of steel structures, etc., those using viscoelastic dampers that absorb vibration energy by shearing the viscoelastic body by vibration, or core material and this core It has a restraining material that restrains buckling while allowing expansion and contraction in the length direction of the material, and prevents damage to the structure by absorbing energy by stretching and contracting the core material while preventing buckling by the restraining material. Various types using a buckling-restrained brace have been provided.

JP 2006-283374 A JP-A-6-57820

  However, the vibration suppression by the viscoelastic damper is effective for small vibrations such as small and medium earthquakes, wind vibrations, traffic vibrations, etc., but it cannot exhibit sufficient effects for large vibrations caused by large earthquakes. On the other hand, vibration suppression by buckling-restrained braces is effective against large vibrations caused by large earthquakes, but cannot sufficiently exhibit small vibrations such as small and medium earthquakes, wind vibrations, and traffic vibrations.

  In view of the above problems, the present invention provides a viscoelastic damper that exhibits sufficient effects against small vibrations such as small and medium earthquakes, wind vibrations, traffic vibrations, and large vibrations caused by large earthquakes. It is an object of the present invention to provide a vibration-damping pillar using a buckling-restrained brace.

The above problem is a vibration control pillar installed between beams of a building,
A viscoelastic damper that absorbs vibrational energy by causing shear deformation of the viscoelastic body by vibration and has a limited movable width of the vibration;
This is solved by a damping stud that uses a buckling constraining brace having a core material and a constraining material that constrains buckling while allowing expansion and contraction in the length direction of the core material.

  In the above-mentioned vibration control column, there is a viscoelastic damper that absorbs vibration energy by causing shear deformation of the viscoelastic body by vibration, so it can withstand small vibrations such as small and medium earthquakes, wind vibrations, traffic vibrations, etc. In addition to functioning effectively, the viscoelastic damper restricts buckling while allowing the core material and expansion and contraction in the length direction of the core material because the movable width of the vibration is limited during large vibrations caused by a large earthquake. A buckling-restrained brace having a restraining material functions effectively as a hysteretic damper. By providing a mechanism that limits the movable width of vibration in the viscoelastic damper, the vibration of the viscoelastic damper is limited when the vibration exceeds a certain level, so that the buckling-restrained brace functions preferentially to handle large vibrations. Can do.

  Moreover, it is good to attach a viscoelastic damper to the center part of a vibration suppression stud. By attaching the viscoelastic damper to the center of the damping stud, it can be unitized as a damping stud with viscoelastic damper. It is only necessary to join the main body portion, and the construction of the vibration damping pillar can be easily performed. In addition, when retrofitting an existing building, it is possible to easily carry out the construction by using a unitized damping pillar. Furthermore, when exchanging the viscoelastic damper, the viscoelastic damper can be easily replaced because the viscoelastic damper is in the central portion of the damping stud.

  Further, it is preferable that a buckling restrained brace is attached between the vibration control pillar and the beam in a cane form. By attaching the buckling-restrained brace between the vibration-damping stud and the beam in the form of a cane, the buckling-restraining brace can effectively function against swinging in each direction such as pitching and rolling. In addition, when the buckling restrained brace is plastically deformed and is replaced, the replacement can be easily performed because the buckling restrained brace is attached in the form of a cane between the damping column and the beam.

  Furthermore, the viscoelastic damper and / or buckling restraint brace may be exchangeable. If the viscous body in the viscoelastic damper has deteriorated or the specification has changed, or if the buckling-restrained brace is plastically deformed due to energy absorption such as an earthquake, the entire damping damping column must be replaced. Without replacement, only the necessary viscoelastic dampers and / or buckling-restraining braces can be replaced, and the required performance can be ensured easily and without cost.

  The vibration suppression studs using the viscoelastic damper and the buckling-restrained brace of the present invention are as described above, so even for small vibrations such as small earthquakes, wind vibrations, traffic vibrations, etc. However, a sufficient effect can be exhibited.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 and 2, 2 is a viscoelastic damper, 3 is a buckling restrained brace, 4 is a column, and 5 is a beam. Reference numeral 6 denotes a rib for reinforcement attached to the column or beam. Damping pillars 1 are provided between the beams of the building. The vibration suppression pillar 1 is composed of a pillar 4 and a viscoelastic damper 2 attached to the center of the pillar 4 in a replaceable manner and a buckling restrained brace 3 attached as a cane between the pillar 4 and the beam 5.

In the viscoelastic damper 2, as shown in FIG. 3, 21 is a viscoelastic damper upper part having a plate 21a, 22 is a viscoelastic damper lower part having an open upper box 22a, the inner wall of the box 22a and the plate The viscoelastic bodies 23, 23 are interposed between 21a, and the viscoelastic damper upper portion 21 and the viscoelastic damper lower portion 22 are relatively displaced in the horizontal direction due to vibrations such as traffic vibration and earthquake. Then, the viscoelastic bodies 23 and 23 are subjected to shear deformation to absorb vibration energy and attenuate the vibration. The plate 21a can move in the horizontal direction inside the box 22a. However, the plate 21a is limited in horizontal vibration by the side wall of the box 22a, and the horizontal displacement of a certain amount or more is restricted. It is made like. In the present embodiment, as shown in FIG. 3B, the plate 21a can move in the vertical direction within the box 22a. However, the plate 21a has a base portion 22b and a plate 21a that support the box 22a. By the base portion 21b that supports the vertical vibration, the vertical vibration is limited, and the vertical displacement of a certain amount or more is restricted.
3 and FIG. 4 to be described later, the shapes of the plate 21a, the box pair 22a, and the viscoelastic body 23 are drawn by deforming the shapes in order to explain the movable state of the viscoelastic damper 2.

  With the above configuration, as shown in FIGS. 4A and 4C, the relative movement amount between the viscoelastic damper upper portion 21 and the viscoelastic damper lower portion 22 is small at the time of small vibration with small amplitude, The movement of the plate 21a is not limited by the side surface of the box 22a and repeats the amplitude, and the viscoelastic body layers 23 and 23 of the viscoelastic damper 2 undergo shear deformation to absorb vibration energy and attenuate the vibration. On the other hand, as shown in FIGS. 4 (Low 1), (Low 2), (Har 1), (Her 2), the viscoelastic damper upper part 21 and the lower part of the viscoelastic damper at the time of large vibration with a large amplitude. Although the amount of relative movement with respect to 22 increases, the lateral movement of the plate 21a is limited by the side surface of the box 22a, and it does not function as a viscoelastic damper. Although this viscoelastic damper 2 does not function as a viscoelastic damper above a certain amplitude, the buckling restraint brace of the damping stud 1 effectively functions as described later by stopping the function as the viscoelastic damper. The amplitude can be attenuated with respect to a large amplitude.

  The upper part 21 of the viscoelastic damper is composed of a base part 21b for supporting the plate 21a, an upper flange, a lower flange, and a joint 4 for joining the pillar 4 made of H-shaped steel made of a web connecting both flanges. . The joint portion is composed of a web portion 21c, an upper flange portion 21d, and a lower flange portion 21d. The web portion 21c, the upper flange portion 21d, and the lower flange portion 21d are respectively bolted via a column 4 and a joining plate 10 made of H-shaped steel. Bolt holes for joining are provided.

  Similarly, the lower side portion 22 of the viscoelastic damper is joined to the base portion 22b that supports the box 22a and the column 4 made of H-shaped steel including the upper flange, the lower flange, and the web connecting the two flanges. It consists of a joint part. The joint portion is composed of a web portion 22c, an upper flange portion 22d, and a lower flange portion 22d. The web portion 22c, the upper flange portion 22d, and the lower flange portion 22d are respectively bolted via a column 4 made of H-shaped steel and the joining plate 10. Holes for joining are provided.

  As shown in FIG. 1, the column 4 and the viscoelastic damper 2 are joined by a viscoelastic damper interposed between the columns 4 and 4, and the web portion, the upper flange portion, and the lower portion of the columns 4 and 4 made of H-shaped steel. The web portion, the upper flange portion, and the lower flange portion of the flange portion and the viscoelastic damper joint portion are joined together and joined by bolts via the plates 10 and 10. Since the viscoelastic damper 2 is joined to the column 4 by a bolt, it can be removed.

  In addition, as shown in FIG. 1, the damping inter-column 1 and the beam 5 are joined by using a T-shaped steel 7 as one flange of the pillar 4 made of H-shaped steel and an L-shaped steel 8 as a joining member. Joined by split tee joining. Reference numeral 9 denotes a spacer that fills the gap between the beam 5 and the L-shaped steel 8.

  As shown in FIG. 5, the buckling restrained brace 3 includes a core material 31 and a restraining material 32 that surrounds the core material and restrains buckling while allowing the core material 31 to expand and contract in the length direction. . The buckling restraint brace 3 is not particularly limited as long as it has a core material 31 and a restraint material 32. For example, as shown in FIG. 5, the core material 31 is a low yield point steel material having a square cross section. Further, it is assumed that a buckling restraining material 32 made of concrete having a hollow square cross section is provided via an unbonding material 35 while leaving both end portions around the periphery. The core material 31 may be a shape steel such as an angle material. For the unbond material 35, grease, asphalt, or the like is used. Both end portions of the core material 31 protrude from the end portions of the buckling restraining material 32, and the joining plate 33 joined to the column 4 and the joining plate 34 joined to the beam of the building frame are connected to the projecting portions. Different from each other by 90 degrees, a buckling restraint brace is used as a cane at the joint between the column 4 and the beam 5, and the respective joint plates 33 and 34 are fitted to the joint surface between the column 4 and the beam 5 and attached by bolt joining. These joining plates 33 and 34 are provided with a plurality of bolt holes. Since the buckling restrained brace 3 is joined to the column 4 and the beam 5 by bolts, it can be removed. In particular, since the buckling restrained brace is joined to the column 4 and the beam 5 in the form of a cane, it can be easily removed.

  The buckling-restrained brace 3 is incorporated as a cane between the pillar 4 and the beam 5 as a part of the vibration-damping pillar 1, so that vibration energy such as earthquake is absorbed by the core material 31 of the buckling-restrained brace. Since the core material 31 is buckled and restrained by the restraining material 32 provided along the outer periphery thereof, a compressive strength is imparted and a good seismic reinforcement function for the structure is achieved. Further, the buckling restrained brace obtains a buckling restraining function by allowing the axial movement of the core material 31 and the restraining material 32 to be allowed, but between the core material 31 and the restraining material 32. By interposing the unbonded material 35, the core material 31 and the restraining material 32 are in contact with each other and the relative movement is not hindered by the friction, and the acceptable state of relative movement is always maintained, and the buckling prevention function is ensured. Is done.

  As described above, the damping column 1 is configured such that the viscoelastic damper 2 and the buckling restraint brace 3 are detachably attached, and the movable width of the viscoelastic damper 2 is limited. The viscoelastic damper 2 functions effectively for small vibrations such as wind vibrations and traffic vibrations. In the case of large vibrations caused by a large earthquake, the viscoelastic dampers 2 are limited in their movable widths and have a constant amplitude. The above does not function as a viscoelastic damper, but by stopping the function as a viscoelastic damper, the buckling constraining brace 3 of the damping column 1 functions effectively, and the buckling constraining brace 3 is effectively used as a hysteretic damper. Function. Therefore, it can function effectively and absorb vibrations from small amplitude vibrations such as traffic vibration, wind, and small earthquakes to large amplitude vibrations caused by large earthquakes.

  Moreover, by attaching the viscoelastic damper 2 to the center portion of the damping stud 1, it can be unitized as the damping stud 1 having the viscoelastic damper 2, and the construction of the building main body and the damping stud 1 is performed on the building. It is only necessary to join a beam or the like and the main body portion of the vibration suppression stud 1, and the construction of the vibration suppression pillar 1 can be easily performed. In addition, when the existing building is subjected to seismic reinforcement, the construction can be easily performed using the unitized damping pillars 1. Further, when the viscoelastic damper 2 is replaced, the viscoelastic damper 2 can be easily replaced because the viscoelastic damper 2 is in the central portion of the vibration damping stud 1.

  Moreover, since the buckling restraint brace 3 is attached between the vibration control column 1 and the beam in the form of a cane, the buckling restraint brace 3 can effectively function even in a swing in each direction such as a longitudinal swing and a lateral swing. it can. In addition, when the buckling restraint brace 1 is plastically deformed and the buckling restraint brace 3 is replaced, the buckling restraint brace 1 is easily attached because it is attached between the vibration control column and the beam in the form of a cane.

  Further, when the viscous body in the viscoelastic damper 2 is deteriorated or the specification is changed, or when the buckling restraint brace 3 is plastically deformed due to energy absorption such as an earthquake, vibration control is required. By exchanging only the necessary viscoelastic damper 2 and / or buckling-restrained brace 3 without exchanging the entire stud 1, it is possible to easily and inexpensively exchange and ensure the necessary performance. Can do.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

In the above embodiment, the viscoelastic damper 2 is mounted between the columns 4 and 4. However, the mounting position of the viscoelastic damper is not limited, and the configuration of the viscoelastic damper is also shown in the above embodiment. The viscoelastic damper may be any viscoelastic damper that absorbs vibration by a viscoelastic body. In this embodiment, the viscoelastic damper functions not only for horizontal vibration but also for vertical vibration. Although shown, the viscoelastic damper which functions with respect to the vibration only in the horizontal direction may be used.
Further, the buckling restraint brace is not limited to the configuration shown in the above embodiment, and includes a core member and a restraint restraint brace that restrains buckling while allowing expansion and contraction of the core member in the length direction. The unbonded material may be omitted, and the fixing position with respect to the vibration control pillar is not limited to the cane type.

  In addition, although the shape steel of the damping stud is shown in the case of the H-shaped steel, it is not limited to the H-shaped steel, any shape steel can be used, and the shape of the joint portion of the viscoelastic damper is also used. What is necessary is just to respond | correspond to the shape of a shape steel.

It is a principal part enlarged front view which shows a part of damping damping pillar which is embodiment of this invention. It is a front view which shows the condition which attached the damping pillar to the building frame. The structure of the viscoelastic damper attached to a damping pillar is shown, (a) is a side view, (b) is a front view, and (c) is a cross-sectional view along line AA in (b). FIG. 1 (a), FIG. (Row 1), FIG. (Row 2), FIG. (C), FIG. (Knee 1) and FIG. (Knee 2) are explanatory diagrams showing the operating state of the viscoelastic damper attached to the vibration damping stud. It is. The structure of the buckling restraint brace attached to a vibration suppression stud is shown, (a) is a front view, (b) is a side view, and (c) is a cross-sectional view taken along line BB in (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Damping pillar 2 ... Viscoelastic damper 3 ... Buckling restraint brace 4 ... Column 5 ... Beam

Claims (1)

A damping stud attached between the beams of the building,
The viscoelastic body is subjected to shear deformation by vibration to absorb vibration energy, and the viscoelastic damper with limited movable width of the vibration, the core material, and expansion and contraction in the length direction of the core material are allowed. buckling restrained braces and a restraining member for restraining the buckling is used in combination with,
The viscoelastic damper is attached to the central part of the vibration control column in an exchangeable manner,
A damping damping column, wherein the buckling-restraining brace is in the form of a cane and is exchangeably mounted between the damping damping column and the beam in a manner that does not straddle the viscoelastic damper .

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