JP2002048191A - Anti-vibration apparatus for vertical vibration of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide anti-vibration apparatus for vertical vibration which enables regulation of natural frequency within wide limits in terms of vibration from a low limit of natural frequency to a high limit thereof. SOLUTION: A pair of pendulums (10) comprise, respectively, an arm (12) installed revolvably on a horizontal axis (11) attached to a column part (53) of the structure and an oscillating body (13) mounted on the tip portions of the arm adjustably angularly. The pair of the pendulums are supported in the form of a balancing toy by means of a spring (14) arranged between the oscillating bodies of right and left connectably for adjusting the natural frequency to allow pendulum oscillation based on the position slanted in the roof form of which center is projected upward as the reference position and a damper (15) disposed between the pain of arms of right and left connectably for vibration damping. The natural frequency can be regulated over a wide range by controlling length of the arm, the angle of inclination of the arm, the installation position of the spring and the spring constant of the spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical vibration damper for a building, and more particularly to a pendulum type vertical vibration damper using a pendulum.

[0002]

2. Description of the Related Art As a general vertical vibration damping device for a building such as a bridge where vertical vibration is likely to occur, a vibration damping device as shown in FIGS. 7 and 8, this conventional vibration damping device supports a base end of an arm 54 on a column 53 between upper and lower girders 51 to 52 so as to be vertically rotatable about a horizontal shaft 55. A transverse pendulum is formed by mounting a vibrating body 56 on the distal end side, and a spring 57 for adjusting the frequency and a damper 58 for vibration damping are interposed between the arm 54 and the lower girder 52. Reference numeral 59 denotes a stopper that suppresses excessive vibration of the vibrating body 56. When the upper and lower girders 51 and 52 vibrate up and down due to wind, earthquake, etc., the arm 5
4 vibrates up and down in a cycle given by the spring 57 with a time difference, and the vibration force is suppressed by the damper 58, so that the vertical vibration generated in the upper and lower girders 51 and 52 of the building is generated. Is attenuated.

[0003]

However, in the case of this vibration damping device, the adjustment of the natural frequency of the vibrating body 56 is performed by the length of the arm 54 and the mounting position of the spring 57, and the adjustable range is narrow. There is a problem. In addition, since the weight of the vibrating body 56 is applied to the tip of the lateral arm, the influence of the mass of the vibrating body 56 is large, it is difficult to perform adjustment in a range where the natural frequency is low, and a vibration damping device having a low natural frequency cannot be manufactured. There is also. An object of the present invention is to provide a vertical vibration damping device capable of adjusting a natural frequency in a wide range from a low natural frequency range to a high natural frequency range with respect to vibration in view of the above-described conventional situation.

[0004]

According to the first aspect of the present invention, there is provided a vibration damping device for suppressing a vertical vibration of a building, wherein the base ends of both arms are rotatable at a position close to the building. A pair of pendulums that are attached, the length of both arms is the same, and the mass of the vibrator attached to the ends of both arms is the same, and the pair of pendulums have the same spring constant and length A spring arranged between the opening angles of the arms so as to be symmetrical with respect to the vertical line, and arranged between the opening angles of the arms so as to have the same damping ability with each other and to be symmetrical with respect to the reference vertical line. The damper provides a vertical vibration damping device in which the arm is extended and supported in the left-right direction so that the opening angle of the arm from the reference vertical line becomes the same.

[0005] In the vertical vibration damping device configured as described above, when the building vibrates up and down, the horizontal vibration components (energy) of the left and right vibrators are offset, and the vibrator of the two left and right pendulums is canceled out. Only the vertical vibration component due to the mass of the arm acts as the natural vibration in the vertical direction of the vibration damping device, and the arm length,
The natural frequency can be adjusted by the mounting position of the spring, the opening angle of the arm, and the spring constant of the spring.

According to a second aspect of the present invention, there is provided the vertical vibration damping device according to the first aspect of the present invention, wherein the base ends of both arms are rotatably attached to the same place in the building. According to a third aspect of the present invention, there is provided the vertical vibration damping device according to the first aspect of the present invention, wherein the base ends of both arms are rotatably attached to a column extending in a vertical direction of the building. According to a fourth aspect of the present invention, in the first aspect of the present invention, a vertical line from the center of rotation of the base end of the pendulum arm toward the center of gravity of the vibrating body is inclined with respect to a horizontal line. An apparatus is provided. According to a fifth aspect of the present invention, in the invention of the fourth aspect, a line extending from the center of rotation of the base end of the pendulum arm toward the center of gravity of the vibrator is 15 ° to 85 ° below the horizontal line. An angled vertical vibration damping device is provided in the range of °. According to a sixth aspect of the present invention, there is provided the vertical vibration damping device according to the first aspect of the present invention, wherein the spring and the damper are arranged to extend and contract in a substantially horizontal direction. According to a seventh aspect of the present invention, there is provided the vertical vibration damping device according to the first aspect, wherein the pair of pendulums is supported by one common spring and one common damper. According to an eighth aspect of the present invention, in the first aspect of the present invention, the end of the spring and the damper on the counter pendulum side is directly or indirectly attached to a column extending in the vertical direction of the building. A vibration damping device is provided. According to a ninth aspect of the present invention, there is provided the viscous damper according to the first aspect of the present invention, wherein the damper is arranged on a floor surface and moves a resistance plate in a viscous fluid, and the resistance plate of the viscous damper is attached to the pendulum. Vertical vibration damping device is provided.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment will be described. FIG. 1 is a front view of the vertical vibration damping device according to the first embodiment, and FIG. 2 is a plan view taken along arrows II to II in FIG. 1 and 2, a vertical vibration damping device 1 according to the present invention between upper and lower girders 51, 52 of a building.
Are arranged.

[0008] The vibration damping device 1 has a pair of pendulums 10,
One end of each pendulum is provided with a pair of arms 12 rotatably mounted on a horizontal shaft 11 attached to a column 53 extending vertically between the beams 51 and 52, and each arm 12.
It has a vibrating body 13 attached to the tip so that the angle can be adjusted. The pair of pendulums 10 are provided with springs 14 connected at both ends to left and right vibrating bodies 13 so that pendulum vibrations can be performed with reference to a roof-like position where the center protrudes upward.
And a damper 15 for damping vibration, which is provided by connecting both ends to a pair of left and right arms 12, and is supported in a jirobe shape. Reference numeral 16 denotes a stopper disposed on the lower girder 52 so as to suppress excessive lowering of the vibrating body 13.

When the building vibrates vertically, the left and right vibrating bodies 13 of the pendulum 10 vibrate symmetrically in the direction of the arc shown by the arrow in FIG. The horizontal vibration component (energy) generated in the pendulum by the opposing vibration in the direction of the arc of 13 is canceled, and only the vertical vibration component due to the mass of the vibrating body 13 of the two left and right pendulums is reduced by the pendulum 10 of the vibration damper 1. It acts as a natural vibration in the vertical direction.

The adjustment of the natural frequency in the vertical direction at this time is performed by adjusting the arm length, the spring mounting position, and the arm 1.
2 and the adjustment of the spring constant of the spring 14 can be adjusted over a wide range from a low natural frequency to a high natural frequency.

In the case of this embodiment, the pair of arms 12 can be provided so as to be adjusted so as to oscillate a pendulum with a downward inclination angle set in a range of about 15 ° to 85 ° as a reference position. If the downward inclination angle of the arm 12 is reduced, the vertical vibration amplitude during vibration can be increased, and the vertical vibration width of the vibrating body 13 can be increased in a range where the stroke of the spring 14 is small. In addition, since the coil spring 14 is disposed horizontally, the vibration of the vibrating body 13 is less likely to be affected by the bending of the spring due to the weight of the vibrating body 13. As a result, it is possible to provide a vibration damping device having a low frequency and a large amplitude. If the inclination of the arm 12 is increased, the vertical vibration amplitude during vibration can be reduced, and the arm 12 can be installed in a place where the space in the vertical direction is small, which is effective in suppressing vibration having a small vertical vibration amplitude.

Next, a second embodiment will be described.
FIG. 3 is a side view of the pendulum type vertical vibration damping device according to the second embodiment, and FIG. 4 is a plan view taken along arrows IV to IV in FIG. In the second embodiment, the damper 15 in the first embodiment of FIG. 1 is replaced with a floor-mounted viscous damper. In FIG. 3, reference numeral 25 denotes a damper containing a viscous fluid fixedly disposed on a lower spar 52 near a connection point of the spring 14, and 26 denotes a vibrating body 13 to which both ends of the spring 14 are connected.
A resistance plate support member provided to protrude downward at the distal end of the fixed member 13a on the side, 27 is a resistance plate mounted in the floor-installed viscous damper 25, and the resistance plate 27 is pendulum-moved together with the fixed member 13a side, The pendulum vibration is attenuated by viscous resistance with the viscous fluid in the damper 25.

When the vibration damping device 1 is operated at a small operating amplitude level, a sufficient damping performance cannot be obtained with an oil damper horizontally mounted between the vibrating bodies 13. On the other hand, by using the viscous damper 25 installed on the floor as shown in the second embodiment, the vibration damping function at the time of small amplitude can be secured. Other operations and effects are the same as those of the first embodiment.

Next, a third embodiment will be described.
FIG. 5 is a side view of the pendulum type vertical vibration damping device according to the third embodiment, and FIG. 6 is a plan view taken along arrows VI to VI in FIG. As shown in FIGS. 5 and 6, in the third embodiment, a cross beam 31 is provided between a pair of columns 53, and separate left and right springs 34 respectively vibrate the cross beam 31 and the vibration of the pendulum 10. Both ends are attached to the body 13, and the left and right separate dampers 35 are also provided with the cross beams 3.
Both ends are attached to the arm 1 and the arm 12 of the pendulum 10. With this configuration, the number of parts of the spring 34 and the damper 35 increases, but each spring 34 and the damper 35 are reduced in size, and there is an effect that assembly and inspection are facilitated. Other operations and effects are the same as those of the first embodiment.

The case where the arm of the pendulum is inclined downward and the spring and the damper are arranged horizontally has been described above as an example. In addition, the arm and the arm are inclined upward and the spring and the damper are arranged horizontally, or The same applies when the arm is horizontal and the spring and damper are arranged at an angle, or the arm is horizontal and the arm is extended downward or upward, and the spring and damper are attached to this arm so that it is horizontal. Functions and effects can be obtained.

[0016]

The invention according to each claim is a vertical vibration damping device for suppressing vertical vibration of a building, wherein the length of the arm is the same and the mass of the vibrating body attached to the tip of the arm is the same. A pair of pendulums whose base ends are rotatably attached to the building in close proximity to each other, and which are symmetrical with respect to a reference vertical line. A spring disposed between the opening angles of the arms so as to be equally symmetrical with respect to the reference vertical line, and a damper disposed between the opening angles of the arms so as to have the same damping ability and to be symmetrical with respect to the reference vertical line. Thus, the arms are extended and supported in the left-right direction so that the opening angles of the arms from the reference vertical line become the same. Therefore, when the building vibrates up and down, the horizontal vibration components (energy) of the left and right vibrators are offset, and only the vertical vibration components due to the masses of the two left and right pendulum vibrators are moved up and down of the vibration damping device. It acts as a natural vibration in the direction. And
At this time, the natural frequency in the vertical direction can be adjusted by the arm length, the mounting position of the spring, the inclination angle of the arm, and the spring constant of the spring, and can be adjusted over a wide range from a low natural frequency to a high natural frequency.

[Brief description of the drawings]

FIG. 1 is a front view of a vertical vibration damping device according to a first embodiment of the present invention.

FIG. 2 is a plan view taken along arrows II to II in FIG.

FIG. 3 is a front view of a vertical vibration damping device according to a second embodiment of the present invention.

FIG. 4 is a plan view taken along arrows IV to IV in FIG. 3;

FIG. 5 is a side view of a pendulum type vertical vibration damping device according to a third embodiment of the present invention.

6 is a plan view as seen from arrows VI to VI in FIG. 5;

FIG. 7 is a side view of a conventional pendulum type vertical vibration damping device.

8 is a view taken in the direction of arrows VIII to VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Pendulum 12 ... Arm 13 ... Vibrating body 14, 34 ... Spring 15, 25, 35 ... Damper 16 ... Stopper 26, 27 ... Vibrating plate 31 ... Cross beam 51, 52 ... Girder (of building) 53 ... (Building) Column)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Sohei Tateyama 4-62 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term in Hiroshima Works, Mitsubishi Heavy Industries, Ltd. (Reference) 3J048 AA02 AA03 AB01 AC05 AD05 AD14 BC02 BE04 BG10 CB01 CB02 CB22 DA08 EA38

Claims (9)

[Claims] 1. A vibration damping device for suppressing vertical vibration of a building, wherein the base ends of both arms are rotatably mounted at a position close to the building, and both arms have the same length. A pair of pendulums having the same mass of the vibrating body attached to the ends of both arms is provided, and the pair of pendulums have the same spring constant and length, and are symmetrical with respect to the reference vertical line. The spring disposed between the corners and the damper disposed between the opening angles of the arms so that the damping capacity is equal to each other and symmetrical with respect to the reference vertical line, the opening angle of the arm from the reference vertical line is increased. A vibration damping device characterized in that the arms are extended and supported in the left-right direction so as to be the same. 2. The structure according to claim 1, wherein the base ends of both arms are rotatably mounted at the same position on the building.
6. The vibration damping device according to 1. 3. The vibration damping device according to claim 1, wherein base ends of both arms are rotatably attached to a column extending in a vertical direction of the building. 4. The vibration damping device according to claim 1, wherein a line from the center of rotation of the base end of the pendulum arm toward the center of gravity of each vibrator is inclined with respect to a horizontal line. . 5. A line from the center of rotation of the base end of the pendulum arm toward the center of gravity of the vibrator is one line below the horizontal line.
The vibration damping device according to claim 4, wherein the device is inclined in a range of 5 ° to 85 °. 6. The vibration damping device according to claim 1, wherein the spring and the damper are arranged so as to expand and contract in a substantially horizontal direction. 7. A pair of pendulums includes one common spring,
The vibration damping device according to claim 1, wherein the vibration damping device is supported by one common damper. 8. The vibration damper according to claim 1, wherein ends of the spring and the damper on the side opposite to the pendulum are directly or indirectly attached to a column extending in a vertical direction of the building. apparatus. 9. A viscous damper in which a damper is arranged on a floor and is formed by moving a resistance plate in a viscous fluid, wherein the resistance plate of the viscous damper is attached to a pendulum. 6. The vibration damping device according to 1.