JP2627862B2 - Structure damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a structure comprising an additional vibration system (TMD) in which an additional mass is attached to a structure such as a building via an elastic support.

[0002]

2. Description of the Related Art In recent years, vibration damping devices for structures with additional vibration systems, which have been adopted for structures that are easily shaken by winds or earthquakes, such as high-rise buildings and towers, are designed to be used in the most swayable periods of the structures. A nearby additional vibration system is installed at the top of the structure, etc., and when the structure shakes due to wind or earthquake, the additional vibration system vibrates more than the structure by resonance and absorbs the vibration of the structure. This is to suppress the shaking. By the way, in general, structures have different natural frequencies depending on directions.However, in a conventional additional vibration system, the additional mass is simply attached to the structure via an elastic support. One additional vibration system cannot cope with different natural frequencies depending on the direction of the structure, and the additional vibration system should be designed according to the natural frequency of the main vibration direction of the structure, or Or, an additional additional vibration system is provided so as to correspond to each of natural frequencies different depending on the direction of the structure. However, in the case of the former, there is a problem that a vibration damping effect in a direction perpendicular to the main vibration direction can hardly be expected. For example,
In a case where an additional vibration system having one frequency which can be supported is used to control a structure having a natural frequency difference of 5% in each of two directions, the structure effective weight of the weight of the additional vibration system is used. Considering that the ratio to is substantially 1%, it is known that in the direction perpendicular to the main vibration direction, the vibration damping effect is reduced by about half. Also, in the latter case, although it is possible to correspond to each of the natural frequencies different depending on the direction of the structure, since two or more additional vibration systems are installed, the cost of equipment is increased, and a large installation space is required. There was a problem that it became necessary.

[0003]

SUMMARY OF THE INVENTION The present invention solves the problems of a conventional vibration damping device for a structure of an additional vibration system, and differs in one additional vibration system depending on the direction of the structure. It is an object of the present invention to provide a vibration damping device for a structure that can be damped corresponding to each of natural frequencies in a direction, has low equipment cost, and has few restrictions on installation locations.

[0004]

In order to achieve the above object, a vibration damping device for a structure according to a first aspect of the present invention includes an elastic support provided at a predetermined position of the structure, and In a vibration damping device for a structure comprising an additional mass movably attached to a structure, the additional mass cooperates with a parent weight corresponding to a natural frequency in one direction of the structure and the parent weight. And the child weight corresponding to the natural frequency in the direction perpendicular to the direction described above, the parent weight is fixed to the elastic support, and the child weight is free in one direction with respect to the parent weight. The main point is that a child weight is slidably provided on a rail disposed on the upper surface of the parent weight so as to be fixed to the parent weight in a direction perpendicular to the above direction.

[0005] Further, the vibration damping device for a structure according to the second aspect of the present invention comprises:
In the vibration damping device for a structure according to the first aspect of the present invention, a hole is formed in the center of the master weight, and a master weight stop rod for restricting the swing amount of the master weight standing on the structure is inserted into the hole. In addition, an elongated hole is formed at a central portion of the weight in a direction perpendicular to the rail, and a movement of the weight being continuously connected to the upper portion of the weight weight stopping rod in the elongated hole is restricted. The gist is that it has been inserted.

[0006] Further, a vibration damping device for a structure according to a third aspect of the present invention includes:
The gist is that the parent weight and the parent weight restraint bar of the vibration damping device for a structure according to the first invention or the second invention are connected by a weight vibration damping mechanism including a plurality of dampers.

[0007] Further, the structure vibration damping device of the fourth invention comprises:
The gist is that the vibration damping mechanism of the weight of the structural vibration damping device of the third invention is constituted by three or more dampers acting only in the tensile direction.

According to the present invention, the additional mass of a part of the additional vibration system is adjusted so as to correspond to the natural frequency in one direction of the structure.
That is, the total weight of the additional vibration system is designed so as to correspond to the natural frequency in the direction perpendicular to the above-described direction by designing the parent weight.
That is, by designing the parent weight and the child weight, depending on the natural frequency in one direction of the structure and the natural frequency in the direction perpendicular to the direction, a part of the additional mass, that is, the parent weight, Alternatively, all, that is, the parent weight and the child weight can be selectively vibrated to effectively suppress the swing of the structure.

[0009] Further, by inserting a child weight stop rod erected on the structure into a long hole formed in the center of the child weight, the movement of the child weight is restricted, and the child weight is moved to a desired position. A hole drilled in the center of the parent weight and a long hole drilled in the parent weight restraint bar or child weight, while being able to be located at the place, the maximum value of the swing amount of the parent weight and the child weight And the weight can be limited by a weight bar.

Further, by connecting the master weight and the master weight stopping rod by a weight vibration damping mechanism comprising a plurality of dampers, the vibration of the master weight and the child weight can be rapidly attenuated. it can.

In addition, the vibration damping mechanism of the weight is constituted by three or more dampers acting only in the pulling direction, so that the connection between the damper and the main weight and the main weight stopping rod has irregularities such as torsion. It is possible to prevent a strong force from acting.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. The drawings show an example of the structure vibration damping device of the present invention.

The vibration damping device 1 includes an elastic support 3 disposed at a predetermined position on the structure 2, and a weight as an additional mass movably attached to the structure 2 via the elastic support 3. 4
And a child weight 5 and a rail 6 disposed on the upper surface of the parent weight 4
And a guide 7 provided on the lower surface of the child weight for guiding the weight 5 along the rail 6, and a hole 4 a having a circular or square cross section formed in the center of the parent weight 4. A dead weight stop rod 8 for limiting the swing amount of the dead weight 4 erected on the structure 2,
Rail 6 disposed on the upper surface of parent weight 4 at the center of child weight 5
And a child weight stop bar 9 that restricts the movement of the child weight 5 that is connected to the upper part of the parent weight stop rod 8 so as to be inserted into the elongated hole 5a formed in a direction perpendicular to the vertical direction.

Among them, the elastic support 3 is formed by laminating a plate-like rubber and a rubber material such as an iron plate with a reinforcing plate using a material having a different elasticity, with or without bonding. A well-known elastic support having horizontal spring characteristics, such as one provided with a reinforcing member, can be used.

A parent weight 4 is fixed to the elastic support 3 and a child weight 5 is placed on a rail 6 provided on the upper surface of the parent weight 4 in one direction, that is, in the direction of the rail 6. It is slidably provided so as to freely move with respect to the weight and to be fixed to the parent weight 4 in a direction perpendicular to the above direction.

The mass of each of the parent weight 4 and the child weight 5 is
The mass of the parent weight 4 is designed to correspond to the natural frequency in one direction (X direction in the figure) of the structure, and the weight is adjusted to correspond to the natural frequency in the direction perpendicular to this direction (Y direction in the figure). Weight 4
The total mass of the child weight 5 and the weight of the child weight 5 is designed.

It is desirable that the sliding resistance of each of the rail 6, the guide 7, and the elongated hole 5 a formed in the child weight 5 and the child weight restraining rod 9 be reduced.
A well-known rolling guide is used for the
It is conceivable to arrange a low friction material on the sliding contact surface between the elongated hole 5a formed in the hole and the child weight stopping bar 9.

In order to attenuate the vibration of the parent weight 4 and the child weight 5, a damper 10a is provided below the parent weight 4, and the damper 10a allows the parent weight 4 and the parent weight stopping rod 8 To form the vibration damping mechanism 10 of the weight. Specifically, as shown in FIG. 4, the cylinder end and the piston rod end of the damper 10a are attached to a bracket 4b disposed at two places on the lower surface of the parent weight 4 and a bracket 8a disposed at the parent weight stop rod 8. Are swingably connected by pin connection or the like.
In this embodiment, the bracket 4b disposed on the lower surface of the parent weight 4 and the cylinder end are connected by a horizontal pin, and the bracket 8a disposed on the parent weight control rod 8 and the piston rod end are connected by a vertical pin. Further, in order to increase the degree of freedom of the connecting portion, the universal joint 10b is provided in the middle of the connecting portion. Further, it is desirable to use an oil damper in which a piston has pores through which oil flows, as the damper 10a.
The configuration of the vibration damping mechanism of the weight, such as the arrangement method, is not limited to the present embodiment. For example, the weight may be extended from the parent weight restraining rod 8 in three or more directions at equal intervals. It can also be configured to provide a damper.

When dampers are provided so as to extend at equal intervals in three or more directions from the weight stopper rod 8, a damper having a buffering effect only in the pulling direction, for example, a piston By using an oil damper having a hole provided with a check valve in addition to a hole through which oil flows, irregularities such as torsion are formed at the connection between the damper and the parent weight 4 and the parent weight restraining rod 8. It is possible to prevent a strong force from acting.

In this embodiment, the child weight stop rod 9 is continuously provided above the parent weight stop rod 8, but the parent weight stop rod 8 and the child weight stop rod 9 are separately provided. A member that limits the swing amount of the parent weight 4, for example, covers the periphery of the parent weight 4, instead of the parent weight stop bar 8 or the child weight stop bar 9. In this way, a casing (not shown) is fixed to the structure 2 so that the parent weight 4 and the casing are connected by a vibration damping mechanism of the weight, or the vibration of the child weight 5 is independently applied. It is also possible to provide a damping mechanism, for example, a vibration damping mechanism for the child weight that connects the child weight 5 to the child weight stopping bar 9 or a casing (not shown) fixed to the structure 2.

Next, a structure damping method using the above structure damping device 1 will be described. The vibration damping device 1 for a structure is installed at the top of the structure 2 or the like. When the structure 2 shakes due to wind or an earthquake, the parent weight 4 and the child weight 5 of the vibration damping device 1 are resonated to the structure 2 or more. The main weight 4 and the child weight 5 are absorbed by the vibration damping mechanism 10 of the weight including the damper 10a.
The vibration of the structure 2 is suppressed by attenuating the vibration.

In this case, the parent weight 4 designed to correspond to the natural frequency in one direction (X direction in the figure) of the structure 2 or a direction perpendicular to this direction (X direction in the drawing) according to the direction of swing of the structure 2. The master weight 4 and the child weight 5 designed to correspond to the natural frequency (Y direction in the figure) are selectively vibrated to suppress the swing of the structure.

That is, when the structure 2 swings in the X direction in the figure, the movement of the child weight 5 (absolute movement with respect to the structure 2) is restricted by the child weight stopping rod 9, and only the parent weight 4 is moved. Vibrates, and the child weight 5 slides along the rail 6 provided on the upper surface of the parent weight 4. On the other hand, when the structure 2 swings in the Y direction in the figure, the child weight stopping rod 9 can relatively move along the elongated hole 5a formed in the child weight 5, so that the child weight 5 moves (structure). The absolute movement with respect to the object 2)
The weight 5 is not limited by the guide 7 and the rail 6
And vibrates together with the parent weight 4.

The maximum swing amount of the parent weight 4 or the child weight 5 is determined by the hole 4a formed in the center of the parent weight 4 and the center of the parent weight stop rod 8 or the child weight 5. Is limited by the elongated hole 5a and the child weight stopping bar 9 which are formed in the hole, so that the movement of the child weight 5 can be restricted and the child weight 5 can be located at a desired place, and the allowable weight or more can be obtained. Damage to the vibration damping device 1 when a load acts on the vibration damping device 1 can be prevented.

[0025]

According to the present invention, there is provided a combination of an elastic support for fixing a parent weight and a rail in only one direction for slidably supporting a child weight disposed on the upper surface of the parent weight. The vibration damping device can be configured with an extremely simple structure. In addition, the single vibration damping device having the simple structure can perform the vibration damping corresponding to the natural frequencies in two directions different depending on the direction of the structure. For this reason, the cost of the equipment can be reduced and the restriction on the installation location can be reduced.

According to the second aspect of the present invention, it is possible to limit the movement of the child weight so that the child weight can be located at a desired place, and when a load exceeding the allowable value acts on the vibration damping device. It is possible to prevent the damping device from being damaged.

Further, according to the third aspect of the invention, the vibration of the parent weight and the child weight can be rapidly attenuated, the vibration damping effect can be improved, and the damping device can be damaged. Can be prevented.

Further, according to the fourth aspect of the present invention, it is possible to prevent an irregular force such as torsion from acting on the connecting portion between the damper and the main weight and the main weight stopping rod, and to control the vibration damping device. Can be smoothly operated, and the damping device can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 shows (a) a front view and (b) a plan view when a structure vibration damping device of the present invention vibrates in one direction.

FIG. 2 shows (a) a front view and (b) a plan view when the structure vibration damping device of the present invention vibrates in a direction perpendicular to the direction of FIG.

FIG. 3 is a side view showing a case where the vibration damping device for a structure of the present invention vibrates in a direction perpendicular to the direction of FIG. 1 (case of FIG. 2).

4 (a) is a front view and FIG. 4 (b) is a sectional view taken along the line II of the weight damping mechanism of the structural vibration damping device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration suppression device 2 Structure 3 Elastic support 4 Parent weight 4a hole 4b pin 5 Child weight 5a Long hole 6 Rail 7 Guide 8 Parent weight stop rod 8a Locking member 9 Child weight stop rod 10 Weight of weight Vibration damping mechanism

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nozomu Nogawa 1-3-C70-206 Aoyamadai, Suita-shi, Osaka

Claims (4)

(57) [Claims] 1. A vibration damping device for a structure comprising: an elastic support disposed at a predetermined position of the structure; and an additional mass movably attached to the structure via the elastic support. The mass is composed of a parent weight corresponding to the natural frequency in one direction of the structure, and a child weight corresponding to the natural frequency in the direction perpendicular to the direction in cooperation with the parent weight. Is fixed to the elastic support, and the child weight is freely moved with respect to the parent weight in one direction, and is fixed to the parent weight in a direction perpendicular to the direction. A structural mass damper, wherein a child weight is slidably provided on a rail disposed on an upper surface of the structure. 2. A hole is formed in the center of the master weight, and a master weight stop rod for restricting the swing amount of the master weight standing on a structure is inserted into the hole, and the child weight is inserted into the hole. An elongated hole is formed at a central portion of the weight in a direction perpendicular to the rail, and a child weight stop bar for restricting movement of the child weight integrally connected to an upper portion of the parent weight stop bar in the elongated hole. The structure vibration damping device according to claim 1, wherein the structure is inserted. 3. A vibration damping device for a structure according to claim 1, wherein said master weight and said master weight stopping rod are connected by a weight vibration damping mechanism comprising a plurality of dampers. . 4. The vibration damping device for a structure according to claim 3, wherein the vibration damping mechanism of the weight is constituted by three or more dampers acting only in the pulling directions.