JPH07217252A - Vibration control device of structure - Google Patents

Abstract

PURPOSE:To provide a vibration control device of a structure which is capable of damping vibrations using one additional vibration system to correspond to the natural frequency of the structure in two directions that varies depending on the direction of the structure, reduces equiptnent cost, and has few limitations on its installation site. CONSTITUTION:An added mass comprises a main weight 4 which matches the natural frequency of a structure in one direction X and a sub weight 5 which collaborates with the main weight 4 to match the natural frequency of the structure in a perpendicular direction Y to said direction. The main weight 4 is secured to an elastic support 3, and the sub weight 5 is freely slidably provided on a rail 6 disposed on the upper side of the main weight 4, so that the sub weight 5 freely moves with respect to the main weight 4, and that the sub weight 5 is secured to the main weight 4 along the perpendicular direction Y.

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 including an additional vibration system (TMD) in which an additional mass is attached to a structure such as a building through an elastic support.

[0002]

2. Description of the Related Art In recent years, vibration damping devices for additional vibration systems, which have been adopted and put into practical use in structures such as high-rise buildings and towers that are prone to shake due to wind and earthquakes, have A nearby additional vibration system is installed on the top of the structure, and when the structure shakes due to wind or an earthquake, the additional vibration system vibrates more than the structure by resonance and absorbs the vibration of the structure. It suppresses shaking. By the way, in general, a structure has a natural frequency that varies depending on the direction, but in the conventional additional vibration system, since the additional mass is simply attached to the structure via the elastic support, One additional vibration system cannot support 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 two additional vibration systems Alternatively, additional vibration systems of more than that have been installed so as to correspond to different natural frequencies depending on the direction of the structure. However, in the former case, there is a problem in that the damping effect in the direction perpendicular to the main vibration direction can hardly be expected. For example,
In the case of an additional vibration system having one frequency that can be supported, when damping a structure with a natural frequency difference of 5% in each of the two directions, the effective weight of the weight of the additional vibration system It is known that the damping effect is approximately halved in the direction perpendicular to the main vibration direction, considering that the ratio of the above is substantially 1%. Also, in the latter case, although it is possible to respond to each of the natural frequencies that differ depending on the direction of the structure, since two or more additional vibration systems are installed, the cost of the equipment is high and a large installation space is required. It had a problem that it was necessary.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the conventional vibration damping device for a structure of an additional vibration system, and one additional vibration system changes depending on the direction of the structure. An object of the present invention is to provide a vibration damping device for a structure, which can suppress vibrations corresponding to each natural frequency in a direction, has low equipment cost, and has few restrictions on installation location.

[0004]

In order to achieve the above object, a vibration damping device for a structure according to the first aspect of the present invention includes an elastic support disposed at a predetermined position of the structure and an elastic support via the elastic support. In a structure vibration damping device comprising an additional mass movably attached to a structure, the additional mass is combined 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 above direction, the parent weight is fixed to the elastic support, and the child weight is free from the parent weight in one direction. The main feature is that a slave weight is slidably provided on a rail provided on the upper surface of the master weight so that the slave weight is moved to the right side and is fixed to the master weight in the direction perpendicular to the direction.

Further, the structure vibration damping device of the second invention is
A hole is bored in the central portion of the parent weight of the structure damping device of the first aspect of the present invention, and a parent weight stop rod for limiting the swing amount of the parent weight standing on the structure is inserted into the hole. In addition, a long hole is formed in the center of the child weight in the direction perpendicular to the rail, and a child weight stop rod that restricts the movement of the child weight connected to the upper portion of the parent weight stop rod in the elongated hole is provided. The point is to insert the.

The vibration damping device for structures according to the third aspect of the present invention is
The gist of the present invention is to connect the parent weight and the parent weight stop rod of the vibration damping device for a structure according to the first invention or the second invention by a vibration damping mechanism of the weight composed of a plurality of dampers.

Further, the structure vibration damping device of the fourth invention is
The gist is that the vibration damping mechanism of the weight of the structure vibration damping device of the third aspect of the present invention is composed of three or more dampers that act only in the pulling direction.

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

Further, by inserting a child weight restraining rod erected on the structure through an elongated hole formed at the center of the child weight, the movement of the child weight is restricted so that the child weight is desired. A hole that can be located at a place, and the maximum swing amount of the parent weight and child weight is drilled in the center of the parent weight and the parent weight stop rod or the long hole drilled in the child weight. And the child weight can be restricted by the stop rod.

Further, by connecting the parent weight and the parent weight restraining rod by a vibration damping mechanism of the weight composed of a plurality of dampers, the vibrations of the parent weight and the child weight can be quickly damped. it can.

Further, since the vibration damping mechanism of the weight is composed of three or more dampers that act only in the pulling direction, the connecting portion between the damper and the parent weight and the parent weight restraint bar is irregular such as twisting. It is possible to prevent a strong force from acting.

[0012]

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

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

Among them, as the elastic support 3, a plate-shaped rubber and a rubber material such as an iron plate and a reinforcing plate made of a material having a different elastic property are adhered or not laminated, or an elastic body. It is possible to use a known elastic support body having a horizontal spring characteristic, such as a structure in which a reinforcing member is provided in the.

A parent weight 4 is fixed to the elastic support 3, and a child weight 5 is mounted 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, the parent weight 4 is attached to the parent weight 4. It is provided slidably so as to move freely with respect to the weight and be fixed to the parent weight 4 in the 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 so as to correspond to the natural frequency in one direction (X direction in the drawing) of the structure, and the parent weight is designed so as to correspond to the natural frequency in the direction orthogonal to this direction (Y direction in the drawing). Weight 4
The total mass of the child weight 5 and the child weight 5, that is, the mass 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 5a formed in the slave weight 5 and the slave weight restraining rod 9 be small. For this reason, for example, the rail 6 is used.
A well-known rolling guide is used for the guide 7 and the child weight 5
It is conceivable to dispose a low-friction material on the sliding contact surface between the elongated hole 5a bored in and the slave weight restraining rod 9.

In order to damp the vibrations of the parent weight 4 and the child weight 5, a damper 10a is arranged below the parent weight 4, and the damper 10a connects the parent weight 4 and the parent weight stop rod 8 to each other. To form the vibration damping mechanism 10 for the weight. Specifically, as shown in FIG. 4, a bracket 4b provided at two positions on the lower surface of the parent weight 4 and a bracket 8a provided on the parent weight stop rod 8 are provided on the cylinder end of the damper 10a and the piston rod end. Are connected so as to be swingable by pin coupling or the like.
In this embodiment, the bracket 4b provided on the lower surface of the parent weight 4 and the cylinder end are connected by a horizontal pin, and the bracket 8a provided on the parent weight stop rod 8 and a 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 arranged in the middle of the connecting portion. Further, it is desirable to use an oil damper in which fine holes through which oil flows are formed in the piston 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, and for example, it may be extended from the parent weight stop rod 8 in three or more directions at equal intervals. It can also be configured to have a damper.

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

In this embodiment, the child weight stop rod 9 is continuously provided on the upper portion of the parent weight stop rod 8, but the parent weight stop rod 8 and the child weight stop rod 9 are separated from each other. Alternatively, instead of the parent weight stop rod 8 or the child weight restraint rod 9, a member that limits the swing amount of the parent weight 4, for example, the periphery of the parent weight 4 is covered. As described above, a casing (not shown) is fixed to the structure 2, and the main 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 generated. A mechanism for damping, for example, a vibration damping mechanism for the slave weight, which connects the slave weight stop rod 9 or a casing (not shown) fixed to the structure 2 and the slave weight 5, may be provided.

Next, a structure damping method using the structure damping device 1 will be described. The structure vibration damping device 1 is installed on the top of the structure 2 or the like, and 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 resonate to cause the structure 2 or more. In addition to absorbing the vibration of the structure 2 by vibrating significantly, the vibration damping mechanism 10 for the weight including the damper 10a and the like uses the parent weight 4 and the child weight 5
The vibration of the structure 2 is dampened to suppress the swing of the structure 2.

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

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

Further, the maximum value of the swing amount of the parent weight 4 or the child weight 5 is that the hole 4a bored in the central portion of the parent weight 4 and the parent weight restraining rod 8 or the central portion of the child weight 5 are formed. Since it is limited by the elongated hole 5a bored in and the child weight restraining rod 9, it is possible to limit the movement of the child weight 5 to position the child weight 5 at a desired place, and at least the allowable value is exceeded. It is possible to prevent the vibration damping device 1 from being damaged when a load acts on the vibration damping device 1.

[0025]

According to the present invention, the combination of the elastic support for fixing the parent weight and the rail in only one direction slidably supporting the 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, it is possible to perform vibration damping with one vibration damping device having this simple structure in response to natural frequencies in two different directions depending on the direction of the structure. Therefore, the cost of the equipment can be reduced, and restrictions on the installation place can be reduced.

Further, according to the second aspect of the present invention, the movement of the child weight can be restricted so that the child weight can be positioned at a desired position, and a load more than the allowable value acts on the vibration damping device. It is possible to prevent the vibration damping device from being damaged.

Further, according to the third aspect of the present invention, the vibrations of the parent weight and the child weight can be quickly attenuated, the damping effect can be improved, and the damping device can be prevented from being damaged. Can be prevented.

Further, according to the fourth aspect of the present invention, it is possible to prevent an irregular force such as a twist from acting on the connecting portion between the damper and the parent weight and the parent weight restraining rod, and the vibration damping device. It is possible to smooth the operation of and to prevent the vibration damping device from being damaged.

[Brief description of 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 structure vibration damping device of the invention vibrates in a direction perpendicular to the direction of FIG. 1 (case of FIG. 2).

FIG. 4 shows (a) a front view and (b) an I-I sectional view of a vibration damping mechanism of a weight of a structure vibration damping device of the present invention.

[Explanation of symbols]

 1 damping 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 of weight Vibration damping mechanism

Front Page Continuation (72) Inventor Mutsumi Fujii 2-3-22-309 Chayamadai, Sakai City, Osaka Prefecture (72) Nozomu Ikawa 1-3-A70, Aoyamadai, Suita City, Osaka Prefecture C70-206

Claims (4)

[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 of the structure in one direction, 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, the slave weight is freely moved in one direction with respect to the master weight, and is fixed to the master weight in a direction perpendicular to the direction so that the master weight is fixed. A vibration damping device for a structure, wherein a slave weight is slidably provided on a rail disposed on the upper surface of the structure. 2. A hole is bored in the central portion of the parent weight, and a parent weight stop rod for limiting the swing amount of the parent weight standing on the structure is inserted into the hole and the child weight is inserted. An elongated hole is formed in the center portion of the weight in a direction perpendicular to the rail, and a child weight stop rod for restricting the movement of the child weight, which is integrally connected to the upper portion of the parent weight stop rod, is provided in the elongated hole. The structure damping device according to claim 1, wherein the structure damping device is inserted. 3. The vibration damping device for a structure according to claim 1, wherein the parent weight and the parent weight restraining rod are connected by a vibration damping mechanism of the weight composed of a plurality of dampers. . 4. The vibration damping device for a structure according to claim 3, wherein the vibration damping mechanism of the weight comprises three or more dampers that act only in the pulling direction.