JPH07139220A - Damping device - Google Patents

Abstract

PURPOSE:To damp the horizontal displacement of a weight through a damping mechanism by insertedly providing the damping mechanism between the lower end of a stopper member which is provided on the lower face of the weight and extended downward and a floor surface. CONSTITUTION:An elastic supporting body 4 formed by laminating a steel plate 4a and an elastic body 4b is fixed onto the floor surface 3 of a building 2. A weight 5 is mounted on the elastic supporting body 4. A base block 9 is fixed onto the floor surface 3 below the central part of the weight 5. A stopper member 11 extending downward is provided on the lower face of the weight 5 so as to oppose the side of the base block 9 at a constant space. One or more damping mechanisms A for the horizontal displacement of the weight 5 are insertedly provided between the lower face of the stopper member 11 and the floor surface 3. At the time of strong wind and an earthquake, the vibration of the building 2 and the weight 5 is detected by a sensor, and the rotation of a driving motor 8 is therefore is controlled to displace the weight 5 in the direction of X for damping the vibration of the building 2 in the direction of X. In addition, the weight 5 acts on the vibration of the building 2 in the direction of Y, so to speak, similarly as in the case of TMD to negate the vibration of the building 2 in the direction of Y. The displacement of the weight 5 in this case is damped by damping dampers A, A,....

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 suitable for reducing vibrations caused by strong winds, earthquakes, etc. in a building structure such as a skyscraper.

[0002]

2. Description of the Related Art A tuned mass damper (hereinafter referred to as "TMD") known as a vibration damping device is used for reducing primary vibrations of a high-rise building or tower-like building against wind and earthquake. It is what is done. This TMD swingably supports a weight having a natural period equal to the natural period of the building (first-order natural period), and the weight resonates and largely deforms with the shaking of the building, whereby the energy of the shaking of the building is increased. Is absorbed to reduce the vibration of the building and suppress the vibration.
Such a TMD is a so-called passive type vibration damping device that does not use energy.

A drive device for displacing a weight is attached to such a TMD, and a control mechanism provided in the drive device detects a shake of a building or the like to displace the weight more effectively and increase the vibration damping performance. Type mass damper (Hybrid Mass Da)
mper, hereinafter referred to as “HMD”).

The structure of this HMD is as follows, for example. That is, as shown in FIGS. 4 and 5, the HMD 1 has a rectangular shape in plan view and is installed on, for example, the floor surface 3 of the top floor of the building 2. The HMD 1 has elastic supports 4 made of multi-layered rubber fixed on the floor surfaces 3 at the four corners thereof, and steel weights 5 placed on these elastic supports 4.
And a drive device 6 for displacing the weight 5 in a plane substantially parallel to the floor surface 3.

The elastic support member 4 is composed of steel plates 4a and elastic members 4b such as rubber which are alternately laminated.
Due to the deformation, only the horizontal displacement of the weight 5 placed on the upper surface is allowed, and the vertical displacement is restricted. The drive device 6 includes a ball screw 7 extending in one direction (hereinafter, referred to as “X direction”) and having both ends rotatably supported by the weight 5, and a drive motor for rotationally driving the ball screw 7. 8 (see FIG. 4), a base 9 having a rectangular shape in plan view fixed on the floor surface 3 below the center of the weight 5, and the base 9
Supported movably in a direction (hereinafter, referred to as “Y direction”) orthogonal to the extending direction of the ball screw 7,
In addition, the ball screw 7 and the upper base member 10 screwed together are provided. As a result, the weight 5 is displaced in the X direction by receiving a reaction force from the upper base member 10 on the base 2 when the ball screw 7 is rotationally driven by the drive motor 8. It is displaceable in the Y direction. Further, as shown in FIG. 5, the lower surface of the weight 5 faces the side surface of the base 9 at a constant interval.
A reaction force beam (stopper member) 11 is provided. On the other hand, a cushioning member 12 made of rubber or the like is attached to the side surface of the base 9 at a position facing the reaction force beam 11. When the weight 5 is excessively displaced, the reaction beam 11 and the buffer member 12 restrict the displacement.

As shown in FIG. 6, a damping damper 13 is attached to the HMD 1 having such a structure in order to damp the vibration of the weight 5. Damping damper 13
Are arranged between the steel plates 4a, 4a, ... Of the elastic support 4 so as to exert a predetermined damping force. Each damping damper 13 is configured such that a viscoelastic body 13b such as asphalt rubber is sandwiched between the plates 13a and 13a, and the upper and lower steel plates 4 are connected via spacers 14, 14 ,.
The bolts and nuts 15 are attached to a and 4a.
In addition, these damping dampers 13 are not
When the nuts 15 are fastened, they are arranged alternately because a working space is required.

In the HMD 1 having the above-described structure, when the building 2 vibrates during a strong wind or an earthquake, the sensor (not shown) detects the vibration of the building 2 and the weight 5, and the control mechanism (not shown) detects the vibration based on the detected value. The rotation of the drive motor 8 is controlled so that the weight 5 is displaced under the optimum condition. When the ball screw 7 is rotated by the rotation of the drive motor 8, the weight 5 is displaced in the X direction, and the vibration of the X direction component of the building 2 is canceled. Regarding the vibration of the building 2 in the Y-direction component, since the weight 5 is configured to be freely displaceable in the Y-direction, the weight 5 acts in the same manner as in the case of TMD, so that the It is designed to cancel the vibration.

[0008]

However, the conventional vibration damping device as described above has the following problems. In the conventional HMD 1, as described above, the damping damper 13 for damping the displacement of the weight 5 includes the elastic support 4
Are provided between the steel plates 4a, 4a, ..., So to speak, they are integrally provided with the elastic support body 4. Moreover, a large number of damping dampers 13 must be fastened and mounted with bolts and nuts 15 one by one. Moreover, steel plate 4
The intervals of a, 4a, ... Are not constant due to manufacturing errors of the steel plates 4a, the elastic support 4 and the like, and every time each damping damper 13 is attached, the spacers 14 are arranged according to the intervals of the upper and lower steel plates 4a, 4a. The height of the damping damper 13 must be adjusted by determining the height of the damping damper 13. For the above reasons, H
The work of attaching the damping damper 13 to the MD1 is very troublesome, which makes the HMD1
There is a problem that the shortening of the assembling period is hindered, and also when the damping of the weight 5 is to be adjusted or changed, replacement of the damping damper is troublesome, which is also very difficult. The present invention has been made in consideration of the above points, and facilitates installation of the damping damper,
Moreover, it is an object of the present invention to provide a vibration damping device capable of easily adjusting / changing the damping.

[0009]

SUMMARY OF THE INVENTION The present invention is a vibration damping device which is installed on a building structure to reduce vibration of the structure, the vibration damping device being on a floor surface of the structure. An elastic support fixed to the elastic support, a weight placed on the elastic support, a base fixed on the floor surface below the center of the weight, and a side surface of the base at a constant interval. And a stopper member extending downwardly on the lower surface of the weight so as to face each other, and the weight of the weight is horizontal between the lower end of the stopper member and the floor surface. One or more damping mechanisms for damping the displacement in the direction are interposed.

[0010]

In the vibration damping device of the present invention, the damping mechanism is interposed between the lower end portion of the stopper member provided on the lower surface of the weight and extending downward, and the floor surface. The damping mechanism damps the displacement of the weight in the horizontal direction. Also,
Even when installing the damping mechanism or adjusting / changing the damping, this damping mechanism is not attached integrally with the elastic support unlike the conventional damping mechanism, but is provided independently, so that work is performed. It can be easily performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. Here, for example, the vibration damping device according to the present invention is an HMD (Hybrid Mass) which is an active vibration damping device including a drive device for displacing a weight.
A description will be given using an example in the case of being applied to Damper). 1 to 3 show an example of a vibration damping device according to the present invention. In these figures, the same parts as those of FIGS. 4 to 6 shown as the conventional example are designated by the same reference numerals.

The HMD (vibration damping device) 20 has a rectangular shape in a plan view, and is installed on, for example, the floor 3 on the top floor of the building (building structure) 2. The HMD 20 has elastic supports 4 made of multi-stage laminated rubber fixed on floors 3 at the four corners thereof, steel weights 5 placed on these elastic supports 4, and weights 5 on the floor 3. The drive device 6 for displacing in a substantially parallel plane is a main component.

The elastic support member 4 is formed by alternately laminating steel plates 4a and elastic members 4b such as rubber.
Due to the deformation, only the horizontal displacement of the weight 5 placed on the upper surface is allowed, and the vertical displacement is restricted.

Here, the structure of the driving device 6 will be described. An opening 21 having a rectangular shape in plan view is formed in the center of the weight 5 so that the upper and lower surfaces thereof communicate with each other. Linear rails 22, 22 extending in one direction (hereinafter, referred to as “X direction”) are laid on both sides of the opening 21. A drive motor 8 such as an AC servomotor is provided between the linear rails 22 and 22.
Ball screws 7 provided with (see FIG. 1) are rotatably supported at both ends by the weights 5 and arranged in parallel. An upper base member 10 is movably mounted on the linear rails 22 and 22, and the upper base member 10 is screwed onto the ball screw 7. On the other hand, as shown in FIG. 2, on the floor surface 3 below the opening 21 of the weight 5, a concrete base 9 having a substantially square shape in plan view is fixed. A pair of linear rails 23 (only one of which is shown) extending in a direction orthogonal to the X direction (hereinafter referred to as “Y direction”) is laid on the upper surface of the base 9. The lower base member 24 is movably mounted on the linear rail 23. The upper base member 10 and the lower base member 24 are connected via a ball joint 25 connecting them flexibly and a cylinder mechanism 26 which is vertically expandable and contractible. Thereby, in the X direction, the upper base member 10 is
It is integrated with the base 9 via the ball joint 25, the cylinder mechanism 26, and the lower base member 24, and has a structure in which movement in the X direction is restricted. On the other hand, in the Y direction, the upper base member 10 is
It is configured so that it can be moved together with. As a result, the weight 5 causes the drive motor 8 to move the ball screw 7 in the X direction.
The upper base member 1 on the base 2 is rotated when driven.
It is designed to be displaced with a reaction force of 0, and is freely displaceable in the Y direction.

On the lower surface of the weight 5, on both sides of the opening 21, brake mechanisms 27, 27, which are composed of hydraulic cylinders and the like which are vertically expandable and contractible, are provided. Each brake mechanism 27 is normally in a contracted state, and the expander 27a provided at the tip of the brake mechanism 27 keeps a constant distance from the floor surface 3, and extends each brake mechanism 27 when, for example, excessive vibration occurs. By doing so, the expander 27a is pressed against the floor surface 3 and the displacement of the weight 5 is prevented.

A reaction force beam (stopper member) 1 is provided on the lower surface of the weight 5 so as to face the side surface of the base 9 at a constant interval.
1 is provided. One end of this reaction force beam 11 is fixed to the lower surface of the weight 5, and horizontally extending steel members 11b, 11b, ... Are attached to the lower ends of the steel members 11a, 11a ,. Thus, it is configured so as to have a substantially square shape in a plan view. On the other hand, a cushioning member 12 made of rubber or the like is attached to the side surface of the base 9 at a position facing the reaction force beam 11. When the weight 5 is excessively displaced, the reaction beam 11 and the buffer member 12 restrict the displacement.

As shown in FIG. 1, this reaction force beam 11
A damping damper (damping mechanism) A for damping the displacement of the weight 5 is interposed between the steel material 11b and the floor surface 3 on each of the four sides. As shown in FIG. 3, each damping damper A is provided between the upper and lower mounting plates 28a and 28b.
A steel plate 29 and a viscoelastic body 30 made of asphalt rubber or the like are alternately laminated, and an upper mounting plate 28a is fixed to a steel material 11b via a bracket 31 such as a bolt (not shown), Mounting plate 2
8b is fixed to the floor surface 3 with a bolt or the like (not shown). The damping damper A damps the displacement of the weight 5 by the viscoelastic body 30.

Next, the HMD 2 having the above structure
The operation of 0 will be described. In the HMD 20, like the HMD 1 shown in FIGS. 4 to 6, when the building 2 vibrates during a strong wind or an earthquake, a sensor (not shown) detects vibrations of the building 2 and the weight 5, and based on the detected value, the drive motor The rotation of 8 is controlled to displace the weight 5 in the X direction to suppress the vibration of the building 2 in the X direction. In addition, Y of building 2
Regarding the vibration of the direction component, this weight 5 is, so to speak, TMD.
The operation is the same as in the above case, and the vibration of the building 2 in the Y direction is cancelled. The displacement of the weight 5 at this time is
It is damped by the damping dampers A, A, ....

In the above HMD20, the damping damper A
Thus, the displacement of the weight 5 can be damped. Also,
To mount the damping damper A when assembling the HMD 20, it is only necessary to mount the damping damper A independently between the lower end of the reaction beam 11 and the floor surface 3, and the damping damper 13 of the HMD 1 shown in FIGS. Elastic support 4 like
Since it is not integrated with the configuration, it does not take time to install. As a result, the mounting of the damping damper A is significantly easier than in the past, and as a result, the HMD2
It is possible to shorten the period required to assemble 0. Further, when adjusting / changing the damping force, the viscoelastic body 30 is also used.
Since this can be dealt with only by changing the area of the above or changing the number of damping dampers A to be attached, this work can be easily performed.

In the above embodiment, H which is an active type vibration damping device having a drive mechanism 6 for displacing the weight 5 is used.
Although the example of the MD 20 is used, if the damping damper A is provided, a so-called TMD that does not have the drive mechanism 6 can also achieve the same effect as above by using the same configuration. In addition, the damping damper A is attached to the steel plate 2
9 and the viscoelastic body 30 are used, but the present invention is not limited to this, and if the displacement of the weight 5 can be damped,
For example, other configurations such as a configuration using an electrorheological fluid may be used. Further, it goes without saying that the number of laminated damping dampers A and the number of installed damping dampers A are not limited.

[0021]

As described above, according to the vibration damping device of the present invention, the damping mechanism is provided between the floor surface and the lower end portion of the stopper member provided on the lower surface of the weight and extending downward. Since it is configured to interpose, the damping mechanism can damp the displacement of the weight in the horizontal direction. Also, when installing or adjusting the damping mechanism, this damping mechanism is not attached integrally with the elastic support unlike the conventional damping mechanism, but is provided independently. Alternatively, the adjustment / change operation of the damping is greatly facilitated, and as a result, the period required for assembling the vibration damping device can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a vibration damping device according to the present invention.

FIG. 2 is a front sectional view of the vibration damping device.

FIG. 3 is a front view showing a damping mechanism provided in the vibration damping device.

FIG. 4 is a plan view showing an example of a conventional vibration damping device.

FIG. 5 is a front sectional view of the vibration damping device.

FIG. 6 is a front view showing a mounting structure of a damping mechanism provided in the vibration damping device.

[Explanation of symbols]

 2 Building (building structure) 4 Elastic support 5 Weight 9 Base 11 Reaction force beam (stopper member) 20 HMD (vibration damping device) A Damping damper (damping mechanism)

Claims (1)

[Claims] 1. A vibration damping device installed on a building structure for reducing vibration of the structure, the vibration damping device comprising: an elastic support member fixed on a floor surface of the structure. , A weight placed on the elastic support, a base fixed on a floor surface below the center of the weight, and a weight of the weight so that the weight faces the side surface of the base at a constant interval. A damping member, which comprises a stopper member extending downward on the lower surface, and damps a horizontal displacement of the weight between the lower end portion of the stopper member and the floor surface. A vibration damping device characterized in that one or more mechanisms are interposed.