JP2008106574A - Vibration control structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economically excellent vibration control structure by which vertical vibrations applied to a beam structural body can be surely reduced and an internal space of a building can be effectively used in spite of the simple structure by devising the structure of the beam structural body. <P>SOLUTION: The vibration control structure is to reduce the vertical vibrations of the beam structural body 1 supported by fixed structures 2, 2 at both ends thereof. A damper member 3 absorbing the energy generated by vertical deformation of the beam structural body 1 is mounted on each connection part between the end of the beam structural body 1 and the fixed structure 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a vibration control structure that reduces vertical vibration of a beam structure supported at both ends by a fixed structure such as a building, a pillar of a building, or a pier, and more specifically, a long span beam, or The present invention relates to a damping structure suitable for reducing vertical vibration of a beam structure such as a bridge.

  For beam structures whose ends are supported by fixed structures such as buildings, building columns, and piers, especially long-span beams and bridge structures such as bridges have large fulcrum distances, resulting in earthquakes, winds, or people. Because vertical vibration is likely to occur due to walking, the beam structure may sway up and down, which may hinder human walking and building structure.

  To reduce the vertical vibration of the beam structure, it is conceivable to improve the bending rigidity of the beam. However, this increases the size and weight of the beam structure, which is uneconomical and effectively uses the internal space of the building. There was a problem that I could not.

Conventionally, as a vibration control technology for a beam structure that is susceptible to vertical vibration, a vertically movable weight (mass) has been installed at the center of the span of the beam structure. A so-called mass damper that reduces vibration by reducing resistance by giving resistance to vibration has been implemented.
However, this mass damper can make the beam structure smaller and lighter than the technology that improves the bending rigidity of the beam structure to prevent vertical vibration, but the mass is about 1% of the mass of the beam as a weight. Therefore, the bending moment of the beam due to the weight, that is, the additional mass is increased, and the increase in size and weight of the beam structure cannot be avoided, and the above problem has not yet been solved.

Therefore, as a vibration control technique for a beam structure that easily generates vertical vibration, a transmission unit that transmits a force for reducing vertical (vertical) vibration to the beam, a boost unit that outputs the force to the transmission unit, There is disclosed a damping device provided with damping force applying means for inputting a damping force to converge the vibration displacement of the beam to the boosting means (see Patent Document 1).
According to the vibration damping technique according to Patent Document 1, the force input to the boosting unit by the damping force applying unit is boosted by the boosting unit and applied to the beam via the transmission unit. The passive vibration damping device can be easily configured to reduce the vibration, and only the transmission means needs to be connected to the beam. There is no need to suspend the beam, and the space under the beam can be used effectively.

Japanese Patent Laid-Open No. 5-18136

  As described above, the technique according to Patent Document 1 has a large number of members as well as a mechanism, as is apparent from Paragraph [0011] of FIG. 1 and FIGS. Are complicated, costly, and prone to failure, leaving room for improvement.

  The purpose of the present invention is to devise the structure of the beam structure to reduce (suppress) the vertical vibration acting on the beam structure with a simple structure and to effectively use the internal space of the building. It is possible to provide a vibration control structure with excellent economic efficiency.

As means for solving the above-mentioned background art, the vibration damping structure according to the invention described in claim 1 is a vibration damping structure that reduces vertical vibration of a beam structure supported at both ends by a fixed structure. And
A damper member that absorbs energy due to vertical deformation generated in the beam structure is provided at a connection portion between the end of the beam structure and the fixed structure.

  According to a second aspect of the present invention, in the vibration damping structure according to the first aspect, the beam structure is configured by a truss structure, and at portions corresponding to the lower chord material or the upper chord material at both ends of the truss structure. A damper member is provided.

  According to a third aspect of the present invention, in the vibration damping structure according to the first or second aspect, the damper member includes an oil damper, a steel material damper, a viscoelastic damper, or a large amplitude damper in series with a small amplitude damper. It is characterized by being a composite type damper that is coupled to.

According to the damping structure according to claims 1 to 3, when vertical vibration is applied to the beam structure 1 due to an earthquake, wind, or human walking, the beam structure 1 is as shown in FIGS. 4A and 4B. In addition, the damper members 3 and 3 swaying up and down, and the damper members 3 and 3 provided at the portions corresponding to the lower chord members at both ends of the beam structure are alternately expanded and contracted to absorb energy due to the vertical deformation generated in the beam structure 1 As a result, the vertical vibration acting on the beam structure 1 can be absorbed and reduced (suppressed).
Therefore, it is not necessary to increase the size and weight of the beam structure 1 as compared with the prior art, which can contribute to cost reduction. Therefore, it is excellent in economic efficiency. Further, along with this, the beam structure 1, and thus the entire column beam frame can be slimmed, so that it is very economical and the internal space of the building can be used effectively.
Furthermore, compared to the technology according to Patent Document 1, the structure is very simple and there is little risk of failure, and the replacement work when the damper is aged can be easily performed. And economical.

  FIG. 1 schematically shows a vibration damping structure according to the first aspect of the invention. This vibration damping structure is a vibration damping structure that reduces the vertical vibration of the beam structure 1 supported at both ends by the fixed structures 2 and 2, and the end of the beam structure 1 and the fixed structure 2 A damper member 3 for absorbing energy due to vertical deformation generated in the beam structure 1 is provided in the connecting portion (the invention according to claim 1).

  Both ends of the beam structure 1 in the longitudinal direction are rigidly connected between the fixed structures 2 and 2 and are laid substantially horizontally. The beam structure 1 is installed in one stage (or two or more stages) between the fixed structures 2 and 2, and although not shown, a floor slab is laid on the beam structure 1. In addition, although the beam structure 1 which concerns on the example of illustration shows the fixed structure (for example, pillar members, such as a pillar and a mega pillar) 2 and 2 and the long span beam 1 constructed between two, it is limited to this Rather, it can be implemented in a similar manner even for long span bridges built between bridge piers.

  Moreover, the beam structure 1 according to the present embodiment is configured with a truss structure. This truss structure is configured by providing an upper chord member and a lower chord member made of a steel material 4 such as H-shaped steel substantially horizontally, and an oblique member 5 (a holding member if necessary) interposed between them. The damper member 3 is provided in the site | part corresponded to the lower chord material (or upper chord material) in the both ends of the structure (invention of Claim 2).

  As shown in FIG. 3, one end of the damper member 3 is firmly attached to the bracket 2a provided on the side surface of the pillar member 2 which is the fixed structure 2 by a joining means such as a high-strength bolt or welding. The other end is also firmly rigidly connected to the end of the steel material (lower chord material) 4 by a joining means such as a high-strength bolt or welding. Further, the upper chord member (or lower chord member) on the side where the damper member 3 is not provided is firmly rigidly connected to the fixed structure (column member) 2 directly by a joining means such as a high strength bolt or welding.

  In addition, although the connection means of the damper member 3 and the column member 2 which concerns on the example of illustration is performed via the bracket 2a provided in the column member 2, the damper member 3 and the column member are directly used without using this bracket 2a. Of course, it is possible to connect the two. In addition, as shown in FIG. 2, the beam structure 1 according to the illustrated example uses a total of four damper members 3, but the number is not limited to this, and depends on the structure of the beam structure 1. Can be increased or decreased as appropriate. Furthermore, in the present embodiment, the beam structure 1 is implemented with a truss structure, but the present invention is not limited to this, and the beam structure can be implemented in substantially the same manner even with a beam structure that is not a truss structure composed of an H-shaped steel material or the like.

The damper member 3 according to the present embodiment uses an oil damper, but in addition to the oil damper, a composite formed by connecting a damper for a small amplitude to a steel damper, a viscoelastic damper, or a damper for a large amplitude in series. It is preferable to select and apply the mold damper according to the structural design (the invention according to claim 3).
Incidentally, as an example of the composite damper, a composite damper disclosed in Japanese Patent Application Laid-Open No. 10-280727 filed earlier by the present applicant is preferably used. Specifically, the large-amplitude damper that constitutes the composite damper is an elastic-plastic member such as an ultra-soft steel that is designed not to buckle by compressive force and yields with a smaller stress than ordinary steel. An unbonded brace or the like in which a circular steel pipe is manufactured and a stiffener for preventing buckling is added thereto is preferably used. In addition to the elastic-plastic damper and the viscoelastic damper, any other types and types of dampers such as a friction damper, a viscous damper, and the like are applied to the small amplitude damper (paragraph [0011] and the like in the above publication and FIGS. See FIG.

  Therefore, according to the vibration damping structure having the above configuration, when vertical vibration is applied to the beam structure 1 due to an earthquake, a wind, or a person walking, the beam structure 1 moves up and down as shown in FIGS. 4A and 4B. Since the damper members 3 and 3 provided at the portions corresponding to the lower chord material at both ends of the swinging can alternately absorb the energy caused by the vertical deformation generated in the beam structure 1 by alternately repeating the expansion and contraction. As a result, the vertical vibration acting on the beam structure 1 can be absorbed and reduced (suppressed). Therefore, it is not necessary to increase the size and weight of the beam structure 1 as compared with the prior art, which can contribute to cost reduction. Therefore, it is excellent in economic efficiency. Further, along with this, the beam structure 1, and thus the entire column beam frame can be slimmed, so that it is very economical and the internal space of the building can be used effectively.

  In addition, although illustration is abbreviate | omitted, although the damper member 3 is provided and implemented about the said beam structure 1 in the site | part corresponded to the lower chord material in the both ends of a truss structure in this Example, it is not limited to this. By changing the design of the mounting positions of the structural members of the truss structure by reversing it up and down, the damper members 3 can be provided at the portions corresponding to the upper chord material at both ends of the truss structure. It is also possible to achieve the following effects (the invention according to claim 2).

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Note that it includes the range.

  For example, in the present embodiment, since the fixed structures 2 and 2 are implemented with substantially the same size and shape, the damper members 3 are provided at both ends of the beam structure 1 (claimed). (Invention of Item 2), when one of the fixed structures (column members, piers, or buildings) 2 is greatly enlarged, and the deformation of the beam structure 1 is different, the deformation is large. In some cases, the damper member 3 may be provided only at the end on the fixed structure 2 side (the invention according to claim 1).

It is the elevation which simplified and showed the damping structure concerning the present invention typically. FIG. 2 is a sectional view taken along line XX in FIG. 1. It is the front view which showed concretely the connection structure of a damper member. A and B are elevation views showing the behavior of the beam structure when vertical vibration is applied to the beam structure.

Explanation of symbols

1 Beam structure (beam or bridge)
2 Fixed structures (column members, piers, or buildings)
2a Bracket 3 Damper member 4 Steel material such as H-shaped steel 5 Diagonal material

Claims (3)

A damping structure that reduces vertical vibration of a beam structure supported at both ends by a fixed structure,
A damper structure for absorbing energy due to vertical deformation generated in the beam structure is provided at a connection portion between the end of the beam structure and a fixed structure.   The said beam structure is comprised by the truss structure, and the damper member is provided in the site | part corresponded to the lower chord material or the upper chord material in the both ends of the said truss structure, The control structure of Claim 1 characterized by the above-mentioned. Shaking structure.   3. The damper according to claim 1, wherein the damper member is an oil damper, a steel damper, a viscoelastic damper, or a composite damper in which a small amplitude damper is connected in series to a large amplitude damper. The damping structure described.

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