JPH09144377A - Tuning mass damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively damp both of translational vibration and torsional vibration by a pair of TMDs against a building where characteristic frequency of the translational vibration is higher than characteristic frequency of the torsional vibration and to reduce the number of devices and to lighten them as much as possible. SOLUTION: This device is furnished with a pair of mass bodies 13a, 13b arranged face to face on both sides of a building 11 in the longitudinal direction, a spring material to elastically support these mass bodies, a damper 17 to damp vibrational components orthogonal with the longitudinal direction of each of the mass bodies, a first liquid charging chamber 18a interposed between one of the mass bodies and the building and capacity of which is expanded and contracted in accordance with relative displacement, a second liquid charging chamber 18b, a communicating pipe 24 to communicate the first and second liquid charging chambers to each other and a chamber 26 to partition a gas chamber 25 in the middle of a piping route of the communicating pipe. Consequently, it is possible to make the gas chamber function as a spring at the time of torsional vibration and make it not function as the spring at the time of translational vibration and accordingly, make it possible to correspond to both of vibration modes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuned mass damper device capable of obtaining a vibration damping effect for two vibration modes of translation and twist of a building.

[0002]

2. Description of the Related Art A tuned mass damper (T) is used as one of the vibration control devices for suppressing the shaking of a high-rise building during an earthquake or strong wind.
uned Mass Damper, hereinafter abbreviated as TMD) is known. This TMD is composed of a vibration system including an additional mass body and a spring that vibrate at the same natural vibration cycle as that of a high-rise building, and a damping system that damps the vibration of this vibration system, and is installed on the top of the building or the like. .

By the way, the shaking generated in a building includes torsional vibration as well as translational (horizontal) vibration in which the entire building moves in parallel. Here, since the natural frequencies of translational vibration and torsional vibration of a building are generally different, it is not possible to effectively reduce these two vibration modes by installing only one passive TMD. It is necessary to separately provide a plurality of units and one for torsional vibration.

FIGS. 5 (a) and 5 (b) show a model in which TMD is applied to the top of a rectangular building 1 having a flat cross section, and a TMD 2 for translational vibration is installed in the center of the building 1. And a pair of TMs on both sides in the longitudinal direction for torsional vibration
D3 is installed opposite.

Each of the TMDs 2 and 3 supports the additional mass body on the building through a spring, and is provided with a damping device for damping the vibration of the additional mass body. The natural frequency and the torsion of the translational vibration of the building 1 are respectively provided. It is adjusted so as to tune to each natural frequency of vibration. Further, the weight of the TMD2 mass body is set to about twice the weight of each TMD3 mass body.

That is, as shown by the imaginary line in FIG.
When translational vibration is applied in the Y direction, which is the short-side direction of the building 1, the mass of the TMD 2 reciprocates in antiphase in synchronism with the Y direction, so that the force opposite to the translational vibration of the building is exerted. Will be applied as a reaction force from the TMD 2 to the building 1, and as a result, the translational vibration of the building will be attenuated.

As shown by the imaginary line in FIG. 5 (b), when torsional vibrations are applied in the XY directions of the building 1, the pair of TMDs 3 move in synchronism with each other in opposite phase directions, causing torsional vibrations. Attenuate.

As described above, since the TMDs 2 and 3 correspond to the natural frequencies of translation and twist of the building 1, three TDMs or more, and two types of functions are required for one building. To do.

[0009]

[Problems to be Solved by the Invention] However, each TM
Since the damping effect of D2 and D3 depends largely on the weight of the mass body, TMD that opposes one vibration mode
The minimum weight of must be set according to the total weight of the building, which is considerably heavy.

Therefore, it is necessary to equip the top of the building 1 with two kinds of TMDs in order to support two vibration modes.
In addition to the equipment cost, the weight added to the building will be doubled, and the burden on the building structure that supports this will be heavy.

The present invention was devised to solve the above problems, and its object is to provide a building in which the natural frequency of torsional vibration is higher than the natural frequency of translational vibration. It is an object of the present invention to provide a tuned mass damper device that can effectively attenuate both vibrations with a pair of TMDs, thereby reducing the number of devices and reducing the weight as much as possible.

[0012]

In order to achieve the above object, a TMD device of the present invention comprises a pair of mass bodies arranged facing each other on both sides in the longitudinal direction of a plane of a building, and at least each of the mass bodies facing each other. A spring that elastically supports in a direction orthogonal to the direction so that it can vibrate, and an attenuator interposed between each of the mass bodies and the building to damp the vibration component of the mass body in the orthogonal direction. A first liquid filling chamber that is interposed between the one mass body and the building, and whose volume is expanded or contracted in accordance with relative displacement of the building due to the vibration in the orthogonal direction, and the other It is interposed between the mass body and the building, and the volume is expanded and contracted in a direction opposite to that of the first liquid filling chamber according to the relative displacement between the mass body and the building due to the vibration in phase with the one mass body. Connecting the second liquid filling chamber, the first liquid filling chamber and the second liquid filling chamber And a spring means that is connected in the middle of the piping path of the communication pipe and that displaces the elastic body according to the pressure fluctuation of the liquid in the communication pipe. It is characterized by.

According to the TMD device having the above structure, in the translational vibration mode of the natural vibration of the building, both mass bodies take the vibration displacement of the same phase, so that one of the first and second liquid filling chambers The liquid on the inside moves toward each other through the communication pipe, becoming the expansion side and the contraction side at the other side, and both mass bodies become a coupled system and are displaced in the same phase direction, and the pressure of the liquid in the communication pipe is almost It does not change. Therefore, the vibration of both mass bodies is the flow resistance when the liquid moves and flows in the communication pipe,
In addition, while being damped by the resistance of the attenuator, a reaction force is applied to the building to suppress translational vibration of the building.

In the torsional vibration mode, which has a higher natural frequency than the translational vibration mode, the mass bodies are displaced in opposite phase directions and vibrate, so that both the first and second liquid filling chambers expand. Side to side or contraction side, mutual movement of the liquid through the communication pipe does not occur, and the pressure of the liquid fluctuates. Then, due to the pressure fluctuation of the liquid, the elastic body of the spring means is displaced to exhibit the spring effect. That is, with respect to the vibration of the pair of mass bodies in the opposite phase direction, the first and second
The liquid filling chamber, the communicating tube, and the spring means function as an appropriate spring system to increase the natural frequency.

Therefore, the TMD device of the present invention has two different natural vibration characteristics when the pair of mass pairs are displaced and vibrated in the same phase direction and when they are displaced and vibrated in the opposite phase direction. By synchronizing the natural vibration characteristics during vibration in the same phase direction with the translational vibration cycle specific to the building, and by synchronizing the natural vibration characteristics during vibration in the opposite phase direction with the torsional vibration cycle of the building, Any vibration can be suppressed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show a TMD device according to the present invention.

As shown in the figure, the TMD device 10 is provided with a pair of TMDs 12a and 12b which are arranged to face each other on both sides in the longitudinal direction of a tall rectangular building 11 having a plane shape. Each TMD1
2a and 12b are mass bodies 13a and 13b having a predetermined weight corresponding to the weight of the building 11, and the mass bodies 13a and 13b.
Supporting means 14a and 14b for elastically supporting 13b at least in a direction orthogonal to the facing arrangement direction (that is, the short side direction of the building 11) and mass bodies 13a and 13.
Damping means 15 for damping the vibration of b in the orthogonal direction
a and 15b. Such TMD12
Basically, it is desirable to install a and 12b at a layer portion which is an antinode of the building vibration to be damped, and in this illustrated example, it is shown that it is provided at the top of the building 11.

The pair of mass bodies 13a and 13b are in the shape of a rectangular parallelepiped, and a vibration isolating spring member 16 made of a laminated rubber plate or the like is provided as the supporting means 14a and 14b below the mass bodies. Each of 13a and 13b is installed and fixed on the top of the building 11 via the vibration-isolating spring member 16 so as to be horizontally vibrable. In addition, each mass body 13a,
In 13b, as the damping means 15a, 15b for damping the relative vibration with the building 11 to suppress the vibration, a damper 17 such as a friction type or a fluid type in two directions along the short side and the long side is provided. It is interposed between the building 11 and the building 11.

By the way, in the present invention, each mass body 13a,
A liquid filling chamber 18 whose volume is expanded or contracted according to the relative displacement between the mass bodies 13a, 13b and the building 11 due to the vibration in the orthogonal direction is provided between the building 13b and the building 13b. In the illustrated example, the liquid filling chamber 18 is a cylinder 19
It is formed by a cylinder mechanism composed of a piston 20 and a piston 20, and is provided on both sides of each of the mass bodies 13a and 13b along the short side direction which is the damping direction. In the illustrated example, the cylinder 2 side is fixedly locked to the building 11 via a locking plate 21, and the piston 2 sliding in the cylinder 19
The 0 side is connected to the mass bodies 13a and 13b, respectively. Here, a slider 22 is provided at the end of the piston rod that extends integrally from the piston 20,
The slider 22 is engaged with and connected to a guide rail 23 provided on a side surface of each of the mass bodies 13a and 13b in order to allow the mass bodies 13a and 13b to vibrate in the long side direction of the building. That is, when the volume of the liquid filling chamber 18 on the one side in the damping direction is increased with respect to the displacement of each of the mass bodies 13a and 13b, the volume of the liquid filling chamber 18 on the other side is reduced. It is like this.

Now, in the case where the building 11 is translationally oscillated and the pair of mass bodies 13a and 13b are both displaced in the same phase direction with respect to the building 11, the respective mass bodies 13a and 13b are displaced.
The liquid filling chambers 18 that are provided on one side in the vibration direction of b and are both expanded and contracted in the same phase are referred to as first filling chambers 18a. If the liquid filling chambers 18 that are expanded and contracted in the opposite phase to the second liquid filling chamber 18b are
3a side first liquid filling chamber 18a and the other mass body 13b
Side second liquid filling chamber 18b is connected to each other by a communication pipe 24 and communicates with each other. Similarly, the first liquid filling chamber 18a on the other mass body 13b side and the second liquid filling chamber 18b on one mass body 13b side are connected to each other. The liquid filling chamber 18b is connected to and communicates with each other by a communication pipe 24, and these two communication pipes 24, 24 are arranged so as to intersect each other in an approximately X shape.

Further, each of the communication pipes 24, 24 is provided at a substantially intermediate position in the middle of the pipe path, and the communication pipes 24, 2 are provided.
There is provided spring means for displacing the elastic body according to the pressure fluctuation of the liquid in 4. In the illustrated example, the spring means is composed of a closed chamber 26 that defines a gas chamber 25. The chamber 26 is connected to the communication pipe 24 and is arranged in a standing state.

FIG. 3 shows the detailed structure of the gas chamber 25. In the figure, each gas chamber 25 is connected to a rising pipe 2 which is connected by screwing or the like through the upper portion of the communication pipe 24.
7 and a chamber 26 that is integrated with the upper portion of the riser pipe 27 and that is internally sealed. The liquid in the communication pipe 24 has entered the chamber 26, and is a space above the liquid surface. Becomes a gas chamber 25, and air is enclosed therein. Further, an orifice 28 having a diameter smaller than the diameter of the rising pipe 27 is formed inside the rising pipe 27. In addition,
Water may be used as the liquid, or oil may be used as the incompressible fluid.

FIGS. 4 (a) and 4 (b) show the T having the above configuration.
The operation modes in the translational vibration mode and the torsional vibration mode of the MD device 10 are shown.

First, with respect to the translational vibration mode in the short side direction of the building 11 of (a), both TMDs 12a and 12b are in the opposite directions relative to the translational vibration of the entire building 11 and both TMDs 12a and 12b. Vibrate in phase with each other. At this time, the first liquid filling chamber 18a on the side of one mass body 13a or 13b and the second liquid filling chamber 18a on the side of the other mass body 13a or 13b.
Of the first and second liquid filling chambers 18a and 18b because their volumes are expanded and contracted in the opposite direction.
The liquid filled therein flows smoothly through the communication pipe 24 from the contraction side to the expansion side as indicated by the small arrows, and flows, and the resistance at the time of the flow causes a vibration damping action. Further, at this time, since the liquid in the communication pipe 24 smoothly flows alternately toward both the liquid filling chambers 18a and 18b, the liquid surface height in the gas chamber 25, that is, the volume of the gas chamber 25 does not greatly change. It does not occur, and the gas chamber 25 does not particularly function as an air spring.

Next, in the torsional vibration mode of (b), since the respective mass bodies 13a and 13b are displaced in the opposite phase directions and vibrate, the first and second liquid filling chambers 18a and 18a,
Both 18b expand or contract to the enlargement side or the reduction side. Therefore, the mutual movement of the liquid through the communication pipe 24 hardly occurs, and the pressure of the liquid fluctuates. Then, the liquid level height in the gas chamber 25 of the chamber 26 fluctuates due to the pressure fluctuation of the liquid, and the air inside expands and contracts as an elastic body to exhibit a spring effect.

That is, for the torsional vibration mode in which the frequency is higher than that in the translational vibration mode and the pair of mass bodies 13a, 13b vibrate in opposite phase directions, the first and second liquid filling chambers 18a, 18b are provided. In addition, the communication pipe 24 and the gas chamber 25 of the chamber 26 form an appropriate spring system.

Therefore, in the TMD device 10 of the present invention,
When the pair of mass bodies 13a and 13b vibrate in the same phase direction and in the opposite phase direction, they have different natural vibration periods, respectively. By synchronizing the natural vibration period of the vibration in the phase direction with the translational vibration period and the torsional vibration period specific to the building, it is possible to suppress both the translational vibration and the torsional vibration of the building.

The above-mentioned two kinds of suppressive actions are based on the individual TMD.
In addition to the weight of the mass body, the elastic coefficient of the spring material, and the damping coefficient of the attenuator that determine the natural vibration period of 12a and 12b alone, the communication pipe 2 that constitutes the spring system by the fluid pressure
4 has a correlation with the cross-sectional area and the length thereof, the cross-sectional area inside the gas chamber 25, the viscoelastic coefficient of the orifice 28, the volume mass of the enclosed liquid, and the like. Therefore, by appropriately setting these values. The device can be adjusted according to the natural vibration characteristics of the building 11 in the translational vibration mode and the torsional vibration mode. Here, the mass body 1
The weights of 3a and 13b, the elastic coefficient of the vibration isolating spring member 16 that elastically supports the mass bodies 13a and 13b, and the attenuator 1
The damping coefficient and the like of 7 are basically set so as to be synchronized with the natural vibration of the translational vibration of the building 11, and are further synchronized with the natural frequency of the torsional vibration with a spring system added by fluid pressure added thereto. Thus, the spring system of the fluid pressure is set.

In the case of a spring system based on fluid pressure, the degree of freedom in routing the piping path is high, so that space restrictions when installing can be easily avoided.

Further, in the illustrated example, the mass bodies 13a and 13b are allowed to vibrate in a horizontal two-dimensional direction by the spring material 16 made of laminated rubber, but the mass bodies 13a and 13b are moved by, for example, a guide rail. May be one-dimensionally regulated only in the short side direction of the building 11 to vibrate.

[0032]

As described above in detail in the embodiments, in the TMD device according to the present invention, between the pair of TMDs arranged opposite to each other in the longitudinal direction of the building, the TMDs are in opposite phase directions. It functions as a spring when displacing and oscillating, but does not function as a spring when displacing and oscillating in the same phase direction.By interposing a spring system by fluid pressure, it vibrates in the opposite phase direction when oscillating in the same phase direction. It is possible to have different natural vibration periods for each of the two cases, so that by synchronizing these natural vibration periods with the natural vibration period of the translational vibration mode and the natural vibration period of the torsional vibration mode of the building, respectively, Vibration can be controlled according to the vibration mode. Therefore,
Two types of T for translational vibration and torsional vibration as before
There is no need to install the MD separately in the building, the equipment cost is lower than the conventional one, and the weight added to the building is half that of the conventional one, so the load on the building structure that supports it is reduced. There is.

[Brief description of the drawings]

FIG. 1 is a plan view of a tuning mass damper according to the present invention.

FIG. 2 is an explanatory side view of FIG. 1;

3A and 3B are enlarged sectional explanatory views of a B part in FIG.

4A and 4B are explanatory diagrams showing operation modes in a translational vibration mode and a torsional vibration mode.

FIG. 5 is an explanatory diagram showing an operation mode of a conventional tuning mass damper in each vibration mode.

[Explanation of symbols]

 11 High-rise building 12a, 12b TMD (tuning mass damper) 13a, 13b Mass body 14a, 14b Supporting means 15a, 15b Damping means 16 Damping spring material 17 Damper 18a First liquid filling chamber 18b Second liquid filling chamber 19 Cylinder 20 Piston 24 Communication pipe 25 Air chamber 26 Chamber (spring means)

Claims (1)

[Claims] 1. A pair of mass bodies arranged opposite to each other on both sides in the longitudinal direction of a plane of a building, and springs elastically supporting each mass body so as to be capable of vibrating at least in a direction orthogonal to the facing arrangement direction. An attenuator interposed between each of the mass bodies and the building in order to damp the vibration component of each of the mass bodies in the orthogonal direction; and an attenuator interposed between the one mass body and the building, A first liquid filling chamber, the volume of which expands and contracts according to the relative displacement with the building due to the vibration in the orthogonal direction, and the same mass body as the one mass body, which is provided between the other mass body and the building. A second volume that expands and contracts in a volume opposite to that of the first liquid-filled chamber according to relative displacement with the building due to phase vibration
A liquid filling chamber, a first liquid filling chamber and a second liquid filling chamber that are connected to each other, and a connecting pipe that connects the two liquid filling chambers to each other, and is connected in the middle of a pipe path of the connecting pipe. A tuning mass damper device, comprising: spring means for displacing the elastic body in accordance with pressure fluctuations of the liquid in the communication pipe.