JP2006070648A - Vibration prevention structure for building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it hard to impair usability of the indoor space in order to prevent vertical vibration of a beam and make it hard to impart adverse effect to frame structures of various shapes. <P>SOLUTION: In a vibration prevention structure for a building in which a beam 2 is installed over mutually adjacent columns 1, provided with a vibration reduction means 3 reducing up and down vibration of beam 2, to constitute the vibration reducing means 3, a wire rope 4 with both end parts being fixed especially to the mutually adjacent columns 1 and whose intermediate part is roller-supported in a tight state in the middle part of the beam 2 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a building vibration suppression structure in which a beam is provided over adjacent columns and provided with a vibration reducing means for reducing vertical vibration of the beam.

  Conventionally, as this kind of building vibration suppression structure, as a vibration reduction means, a column is erected from the beam to the floor between adjacent columns to suppress the vibration of the beam (hereinafter referred to as the first example) In order to reduce vertical vibration by increasing the rigidity of the beam by providing a cane over the column upper end and the beam end (hereinafter referred to as the second example), or wire between adjacent beams over the entire floor There were some that increased the rigidity of the floor (hereinafter referred to as the third example) (see, for example, Patent Document 1 and Patent Document 2).

JP-A 61-165445 (FIG. 1) Japanese Patent No. 3075794 (FIG. 1)

According to the first example of the conventional building vibration suppression structure described above, the stud is located below the beam, and there is a problem that the convenience of use of the indoor space below the beam is greatly impaired.
In addition, according to the second example of the conventional building vibration suppression structure described above, although the stiffness of the beam is greatly increased by the installation of the cane, the long-term and short-term stress states of the frame greatly change, and the stress state of the entire frame Needs to be recalculated. As a result, in order to balance the stress of the entire frame, it may be necessary to reinforce other members, which is troublesome and requires construction costs.
In addition, according to the third example of the conventional building vibration suppression structure described above, since the wire is stretched between adjacent small beams, the building structure is limited to a frame having a plurality of adjacent target small beams. It is not something that can be used in any frame building. That is, there is a problem that versatility is low. Furthermore, since it is necessary to provide the entire floor, in order to prevent vibration by retrofitting an existing building, a large-scale construction is required and there is a problem of lack of practicality.

  Therefore, the object of the present invention is to eliminate the above-mentioned problems, to suppress the vertical vibration of the beam, it is difficult to impair the usability of the indoor space, and is adopted in a state where it is difficult to adversely affect various forms of frames There is a place to provide a building vibration suppression structure that can.

  According to a first characteristic configuration of the present invention, in a building vibration suppression structure in which a beam is provided over adjacent columns and a vibration reduction unit that reduces vertical vibration of the beam is provided, the vibration reduction unit includes both ends. The wire rope is fixed to the adjacent pillars separately, and the intermediate portion is provided with a wire rope that is roller-supported in the intermediate portion of the beam without slack.

According to the first characteristic configuration of the present invention, both ends are fixed to the adjacent columns separately, and the middle portion is a vibration composed of a wire rope that is roller-supported in the middle portion of the beam without any slack. Because the reduction means are provided, the action of restraining the middle part of the beam with the wire rope fixed to the adjacent pillars at each end against the vertical vibration of the beam was born, and by ensuring the stability of the support force by the pillar It becomes possible to more reliably suppress the vertical vibration of the beam. Further, by changing the setting of the height of the column support portion, the crossing angle between the beam and the wire rope changes, and accordingly, the suppression degree of the beam vibration can be easily adjusted over a wide range.
On the other hand, since the support of the wire rope to the beam is a roller support, the supported part of the middle part of the wire rope can move on the roller support against the rolling of the building due to an earthquake, etc. It is possible to prevent adversely affecting the stress balance of the entire frame without being directly affected. Therefore, as in the case of the conventional example in which the above-mentioned wand is provided, it is possible to prevent recalculation of the stress state of the entire frame or to reinforce other members in order to balance the stress of the entire frame, It is possible to suppress the vertical vibration of the beam at low cost without taking time and effort.
In addition, since the target portion where the vibration reducing means is provided is a pillar that is almost present in any building or a beam between pillars, the vibration reducing means can be installed in almost all buildings. In other words, the building vibration suppression structure can be employed in various forms of frames, and high versatility can be achieved.
And since the wire rope is only provided between the middle part of the column and the beam, the installation range is extremely small compared to the case where the lower space of the beam is occupied over a wide area as in the conventional example of providing the intermediate column. It is possible to maintain ease of use of the indoor space.

  According to a second characteristic configuration of the present invention, end support portions for fixing both ends of the wire rope are respectively provided at upper and lower intermediate portions of the pillar, and an intermediate support portion for supporting the intermediate portion of the wire rope with a roller is provided. , Provided on the beam above the end support.

  According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to the first characteristic configuration of the present invention, in the target floor of the building vibration suppression structure, the wire rope is Since it is provided only over the column and the upper beam, the floor of the floor is not occupied at all, and the usability of the indoor space can be maintained more favorably.

  A third characteristic configuration of the present invention is that a prestress in a tensile direction is introduced into the wire rope.

  According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operation and effect of the first or second characteristic configuration of the present invention, the pre-stress in the tensile direction on the wire rope causes the beam to be By increasing the restraining force against the vertical vibration, it is possible to improve the vertical vibration suppression effect of the beam. Furthermore, the stress load on the wire rope itself can be expected not only in the tensile direction but also in the compression direction, and this also makes it possible to further improve the vertical vibration suppression effect of the beam.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a main part of a building B adopting an example of a building vibration suppressing structure of the present invention, and the building B described here is made of a steel structure.
The building B includes a plurality of columns 1 that are erected at horizontal intervals, beams 2 provided across the columns 1, and vibration reduction means 3 that reduces vertical vibrations of the beams 2. It is configured.

  The vibration reducing means 3 is configured by providing wire ropes 4 whose both ends are fixed to the adjacent pillars 1 and whose intermediate portions are roller-supported in the intermediate portions of the beams 2 without slack. .

As shown in FIG. 1, the column 1 is made of H-shaped steel, and an end support portion 1 a for fixing the end of the wire rope 4 is formed at the upper and lower intermediate portions.
The specific example of the end support portion 1a is formed by welding and fixing a metal piece having a hook-engageable hole in the center portion to the flange of the column 1.

  As shown in FIGS. 1 to 3, the beam 2 is made of an H-shaped steel, and an intermediate support portion 2 a for supporting the intermediate portion of the wire rope 4 with a roller is formed at an intermediate portion in the longitudinal direction. It is.

A specific example of the intermediate support portion 2a is configured by a latching member 5 latched on the lower flange of the beam 2 as shown in FIGS.
This latching member 5 connects a pair of hook-shaped latching portions 5a that can be individually latched to both flange portions sandwiching the web of the beam 2 and the latching portions 5a below the beam 2. And a cylindrical roller support portion 5c that is externally fitted to the connection shaft portion 5b so as to be rotatable around the axis.
By attaching the latching portion 5 a to the flange portion of the beam 2, it can be attached to the beam 2. And the said wire rope 4 can be supported in the state which accept | permits moving along the longitudinal direction by the cylinder outer peripheral surface of the said roller support part 5c.

The wire rope 4 has hook portions 4a that can be locked to the end support portion 1a at both ends, respectively (see FIG. 1). These hook portions 4a are individually engaged with the end support portion 1a, and the intermediate portion of the wire rope 4 is on the roller support portion 5c of the hooking member 5 engaged with the beam 2. Placed on.
Although not shown in the drawing, the wire rope 4 is prestressed in the tensile direction using, for example, a pulling tool such as a turnbuckle, lever block, or chain block, and passes through the intermediate support portion 2a. And it is installed in the state without slack between both-ends support part 1a.

  According to the building vibration suppression structure of this embodiment, a downward load is applied to the middle part of the beam 2 by the wire rope 4 in which a support reaction force is secured to the column 1, so that Vibration can be suppressed. Since the wire rope 4 is supported by the roller support portion 5c so as to be movable along the longitudinal direction, when rolls such as an earthquake occur, the advantage of the roller support is exhibited and the lateral direction is exhibited. Therefore, it is possible to suppress vertical vibration without breaking the stress balance of the entire frame. Further, since the installation is limited to a part of the upper corner of the range surrounded by the pillar 1 and the beam 2, the floor can be widely opened and used freely.

[Another embodiment]
Other embodiments will be described below.

<1> The target building is not limited to the steel frame structure described in the previous embodiment. Good.
<2> The vibration reducing means 3 is limited to a configuration in which a wire rope is installed at the upper corner between the pair of columns 1 described in the previous embodiment and the beam 2 provided over the upper ends of the columns. For example, as shown in FIG. 4, the wire rope may be installed at the lower corner between the pair of columns 1 and the beam 2 provided over the lower ends of the columns.
<3> The intermediate support portion 2a is not limited to the configuration provided in one central portion of the beam 2 described in the previous embodiment. For example, as shown in FIG. A plurality of wire ropes constituting the vibration reducing means 3 may be provided. In short, both ends of the wire rope are respectively fixed to the end support portions 1a of the adjacent pillars 1, and the intermediate portion is the intermediate portion of the beam 2. It is only necessary that the intermediate support portion 2a be supported by a roller without any slack. Moreover, it is preferable that prestress is introduced, but the effect of suppressing vertical vibrations is also exhibited by a configuration in which a wire rope is provided so as not to loosen.
<4> The configurations of the end support portion 1a and the intermediate support portion 2a and the corresponding portions of the wire rope 4 corresponding thereto are not limited to the structure described in the previous embodiment, and the structure is changed as appropriate. It is possible.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Front view showing the main part of the building with vibration reduction means Sectional view in the beam width direction showing the roller support Cross-sectional view of the beam support view showing the roller support The front view which shows the installation condition of the vibration reduction means of another embodiment The front view which shows the installation condition of the vibration reduction means of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pillar 1a End support part 2 Beam 2a Intermediate support part 3 Vibration reduction means 4 Wire rope

Claims (3)

A building vibration suppression structure in which a beam is provided across adjacent columns, and vibration reduction means for reducing vertical vibration of the beam is provided,
The vibration reducing means comprises a building vibration suppressing structure in which both ends are separately fixed to the adjacent columns, and a wire rope supported by a roller in a state in which the intermediate portion of the beam is not loosened in the intermediate portion. .   End support portions for fixing both ends of the wire rope are provided in the upper and lower intermediate portions of the pillar, respectively, and the intermediate support portion for supporting the intermediate portion of the wire rope with the roller is located above the end support portion. The building vibration suppression structure according to claim 1, which is provided on the beam.   The building vibration suppression structure according to claim 1 or 2, wherein a prestress in a tensile direction is introduced into the wire rope.

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