JP2017008634A - Multistage pendulum-type tuned mass damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage pendulum-type tuned mass damper capable of effectively suppressing vertical vibration of a weight with a small number of damper units and without requiring a large stroke.SOLUTION: A multistage pendulum-type tuned mass damper 1 includes: one or more frames 4, 5 arranged coaxially inside an outer frame 3 erected on a structure 2, the frames being suspended sequentially from a top part of the outer frame through a plurality of suspension materials 7; and a weight 6 hung from a top part of the frame 5 on an innermost side through a plurality of suspension materials 8. Vertical rigidity of the plurality of suspension materials 8 that hangs the weight 6 is smaller than the vertical rigidity of the plurality of suspension materials 7 that suspends the frames 4, 5. Furthermore, a damper 9 is provided between the frame 5 and the weight 6, in parallel to the plurality of suspension materials 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multi-stage pendulum type TMD (tuned mass damper) in which a plurality of frames are sequentially coaxially suspended and a weight is suspended horizontally by an innermost frame.

  In recent years, as a vibration control technology for high-rise buildings against long-period and long-term ground motions, TMD (tuned mass damper) for wind motion, which has been used as a vibration control technology for minute vibrations of buildings caused by strong winds, etc. Various types of TMDs for earthquakes have been developed, which have been expanded in size and increased in stroke to extend the scope of application to control of large amplitude vibrations of earthquakes.

  As a kind of such an earthquake TMD, in Patent Document 1 below, a moving frame having a medium diameter cylindrical shape and a small diameter cylindrical shape are sequentially coaxially suspended inside a large diameter cylindrical fixed frame, It has been proposed to reduce the overall height while securing the suspension length by suspending the vibrating body horizontally on a movable frame by a plurality of suspension members to make a multistage pendulum type TMD. .

  FIG. 2 shows a multi-stage pendulum type TMD of this type. The TMD 10 includes a cylindrical outer frame 12 erected on the roof of a building 11 and an outer frame 12 disposed in the outer frame 12. A cylindrical intermediate frame 14 that is suspended from a plurality of ropes 13 by a plurality of ropes 13 from above, and a plurality of ropes 15 that are disposed in the intermediate frame 14 and that can be horizontally moved from above the intermediate frames 14. A suspended inner frame 16 and a weight 18 suspended through a plurality of ropes 17 at the center of the inner frame 16 are provided.

  By the way, in the multi-stage pendulum type TMD having the above-described configuration, the weight 18 vibrates in the vertical direction due to vertical earthquake motion during an earthquake, which may cause the TMD to deteriorate in performance or break.

  As a means for solving this, in order to suppress the vertical vibration of the weight 18, the building 11 and the TMD weight 18 are connected in the vertical direction with an oil damper 19 to reduce the vertical vibration of the weight 18. A method of making it possible is conceivable.

  However, if the oil damper 19 is connected to the weight 18 in the vertical direction, when the weight 18 swings during an earthquake, the oil damper 19 is also greatly deformed, and the stroke of the oil damper 19 becomes insufficient and breaks. Is assumed.

  Therefore, as shown in FIG. 3, ropes 13, 15, rope 17 between the outer frame 12 and the intermediate frame 14, between the intermediate frame 14 and the inner frame 16, and between the inner frame 16 and the weight 18, respectively. A method of installing the oil damper 20 in parallel with the above has also been proposed. According to the multi-stage pendulum type TMD, since the vertical deformation of each oil damper 20 is 1/3 of the vertical movement of the weight 18, there is an advantage that there is no possibility of damage beyond the stroke.

  However, the TMD, on the contrary, has a drawback that the vertical deformation of each of the oil dampers 20 is small, so that the vibration energy absorption efficiency is poor. In order to obtain a desired effect, a large number of oil dampers are required. There was a problem that 20 had to be installed.

Japanese Patent Laid-Open No. 7-34720

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a multistage pendulum type TMD that can effectively suppress vertical vibrations of a weight with a small number of dampers and without requiring a large stroke. It is what.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that one or more frames are suspended in a frame erected on a structure sequentially from the upper part of the outer frame via a plurality of suspension members. In the multi-stage pendulum type TMD in which the weight is suspended from the upper part of the innermost frame through a plurality of suspension members, the plurality of suspension members that suspend the frame or the weights The vertical rigidity of the plurality of suspension members at one location is made smaller than the vertical rigidity of the plurality of suspension materials at another location, and in parallel with the plurality of suspension materials at the one location A damper is provided between the frames or between the frame and the weight.

  The invention according to claim 2 is the invention according to claim 1, wherein the total cross-sectional area of the plurality of suspension members at one place is the total cross-sectional area of the plurality of suspension members at another place. It is characterized by being made smaller.

In the multi-stage pendulum type TMD, the multi-stage frame and the suspension material for suspending the weight are arranged in series with respect to the vertical displacement of the weight.
And in invention of Claim 1 or 2, the vertical rigidity of the several suspension material arrange | positioned in one place among them is set to the vertical rigidity of the several suspension material arrange | positioned in the other place. Therefore, the vertical displacement of the weight concentrates on a plurality of suspension members disposed at the one place having the smallest vertical rigidity.

  And since the damper which absorbs the said up-and-down vibration is arrange | positioned in the said one place, the up-and-down vibration of a weight can be effectively suppressed without requiring a big stroke with a small number of dampers. At this time, changing the vertical rigidity of the suspension member does not affect the horizontal oscillation cycle of the weight.

  Here, as an aspect in which the vertical rigidity of the plurality of suspension members arranged at one place is smaller than the vertical rigidity of the plurality of suspension members arranged at other places, the material of the suspension material itself is different. Although the structure changed to a thing of vertical rigidity can also be employ | adopted, when using the same material as the said suspension material, like the invention of Claim 2, a plurality of suspension materials of said one place are used. This can be easily dealt with by making the total cross-sectional area smaller than the total cross-sectional area of a plurality of suspension members at other locations.

  Furthermore, as an aspect of reducing the total cross-sectional area of the plurality of suspension members in one place, the configuration is the same as the number of suspension members in other places, and the cross-sectional area of each one is reduced, It is possible to employ a configuration in which the suspension material having the same cross-sectional area as that of the suspension material in the other part is used in the one place and the number thereof is reduced.

It is the schematic block diagram which looked at the longitudinal cross-section which shows one Embodiment of this invention. It is a front view which shows the said one Embodiment. FIG. 3 is a plan view of FIG. 2. It is the schematic block diagram which looked at the longitudinal cross-section which shows the conventional multistage pendulum type TMD. It is the schematic block diagram which looked at the longitudinal cross-section which shows the other conventional multistage pendulum type TMD.

1 to 3 show an embodiment of a multistage pendulum type TMD according to the present invention.
The TMD 1 is provided on the outer frame 3 standing on the roof of the building 2, the intermediate frame 4 coaxially disposed in the outer frame 3, and coaxially disposed in the intermediate frame 4. An inner frame 5 and a weight 6 disposed at the center of the inner frame 5 are provided.

  Here, the outer frame 3 is a rectangular framework in which the upper ends of the four pillar members 3a are connected by the beam member 3b, and between the beam members 3b at both ends of a pair of opposed long side beams 3b. A pair of beams 3c is fixed across the bridge. Then, the intermediate frame 4 is suspended in the outer frame 3 so as to be horizontally movable by a plurality (four in total in the figure) of ropes (suspending members) 7 suspended from both ends of the pair of beams 3c. .

  The intermediate frame 4 includes a lower frame member 4a assembled in a rectangular shape, column members 4b erected at the four corners of the lower frame member 4a, and a girder member 4c that connects upper ends of the column members 4b. The lower frame member 4 a is suspended by the rope 7.

  Further, a pair of beams 4d is fixed to both ends of the pair of long-side beams 4c facing each other and straddled between the beams 4b, and a plurality of pieces (total in the figure) are suspended from both ends of the pair of beams 4d. The inner frame 5 is suspended in the intermediate frame 4 so as to be horizontally movable by four ropes (suspending members) 7.

  The inner frame 5 is also a frame material obtained by reducing the size of the intermediate frame 4, a rectangular lower frame member 5a, column members 5b erected at the four corners of the lower frame member 5a, and the column members 5b. The lower frame material 5a is suspended by the rope 7.

  A pair of beams 5d are fixed to both ends of the pair of long-side beams 5c facing each other and spanned between the beams 5b, and a plurality of pieces (total in the figure) are suspended from the both ends of the pair of beams 5d. A weight 6 is suspended in the inner frame 5 by four ropes (suspending members) 8 so as to be horizontally movable.

  In this TMD, the rope 8 that suspends the weight 6 located on the innermost side has a cross-sectional area smaller than that of the other ropes 7. As a result, the total cross-sectional area of the plurality of ropes 8 arranged between the inner frame 5 and the weight 6 (one place) is between the outer frame 3 and the intermediate frame 4 and between the intermediate frame 4 and the inner frame 5. It is smaller than the total cross-sectional area of the rope 7 disposed between (other places). An oil damper 9 is provided in parallel with the rope 8 between the flange portion 5 a and the weight 6.

  In the multi-stage pendulum type TMD configured as described above, the total cross-sectional area of the rope 8 disposed between the inner frame 5 and the weight 6 is set to be larger than the total cross-sectional area of the rope 7 disposed at other locations. Since the vertical stiffness by the plurality of ropes 8 is made smaller than the vertical stiffness by the plurality of ropes 7 by making the size smaller, the vertical displacement of the weight 6 is concentrated on the rope 8 having the smallest vertical stiffness. become.

  And since the oil damper 9 which absorbs the said vertical vibration is arrange | positioned in parallel with these ropes 8, compared with the conventional multistage pendulum type TMD shown in FIG. And the vertical vibration of the weight 6 can be effectively suppressed without requiring a large stroke.

  In the above embodiment, the cross-sectional area of the rope 8 arranged between the inner frame 5 and the weight 6 (one place) is set between the outer frame 3 and the intermediate frame 4 and between the intermediate frame 4 and the inner frame 5. When the total cross-sectional area of the rope 8 is made smaller than the total cross-sectional area of the rope 7 arranged at other places by making it smaller than the cross-sectional area of the rope 7 arranged between (other places) However, the present invention is not limited to this.

  That is, as the ropes 7 and 8, the same product having the same cross-sectional area is used, and the rope 7 disposed between the outer frame 3 and the intermediate frame 4 and between the intermediate frame 4 and the inner frame 5 (other portions). Is more than the number of eight ropes arranged between the inner frame 5 and the weight 6 (one place), so that the total cross-sectional area of the rope 8 is the total of the ropes 7 arranged at other places. The same effect can be obtained by making it smaller than the cross-sectional area. In addition, in this case, there is an advantage that ropes 7 and 8 having the same standard can be used.

1 Multi-stage pendulum type TMD
3 Outer frame 4 Intermediate frame 5 Inner frame 6 Weight 7, 8 Rope (suspending material)
9 Oil damper (damper)

Claims (2)

In the frame erected on the structure, one or more frames that are sequentially suspended from the upper part of the outer frame via a plurality of suspension members are arranged coaxially, and a plurality of frames are arranged from the upper part of the innermost frame. In a multi-stage pendulum tuned mass damper in which a weight is suspended through a suspension of books,
The vertical rigidity of the plurality of suspension members at one place among the plurality of suspension members for suspending the frame or the weight is made smaller than the vertical rigidity of the plurality of suspension members at other places, A multi-stage pendulum type tuned mass damper is characterized in that a damper is provided between the frames or between the frame and the weight in parallel with the plurality of suspension members at one place.   The multi-stage pendulum tuned according to claim 1, wherein a total cross-sectional area of the plurality of suspension members at the one place is made smaller than a total cross-sectional area of the plurality of suspension members at another place. Mass damper.

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