JP3032870B2 - Structure damping device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application field] The present invention is to effectively suppress vibrations caused in a structure by an external force such as an earthquake or a strong wind, and particularly to improve comfort of a high-rise structure. The present invention relates to a vibration control device for a structure that can be used.

[Prior art] In recent years, building and civil engineering structures have become larger, more diversified, and lighter due to factors such as the development of high-strength materials, dramatic progress in machining technology, and the development of structural analysis technology using computers. The structure has become more flexible with respect to external forces. In such a lightweight and flexible structure, the natural frequency tends to be low and the vibration damping tends to be small. For this reason, when an external force such as an earthquake or a strong wind acts on the structure, various unexpected vibrations may occur.

Therefore, in order to suppress the above-mentioned vibration, a method of incorporating a viscous body at a predetermined position on each floor of a structure, or an active dynamic vibration absorber including an inertial mass body and an actuator at a predetermined position above the structure Various methods have been proposed and are adopted for various structures.

[Problems to be Solved by the Invention] By the way, the above-mentioned method of incorporating a viscous body has an advantage that vibration of a high frequency component can be suppressed without the need for externally applying energy. The amount is limited, especially for high-rise structures.
Compared with the vibration suppression effect of the high frequency component, it is difficult to obtain the expected response reduction effect for the low frequency component.

In the method using an active dynamic vibration absorber consisting of an inertial mass body and an actuator, the inertial mass body is moved in the horizontal direction by forcibly applying an external force to the inertial mass body. Vibration can be suppressed and a good response reduction effect can be obtained, but it is difficult to obtain a stable response reduction effect for high frequency components.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration damping device for a structure that effectively solves the above-described difficult points and has a vibration suppressing effect that is superior to a conventional method.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs a vibration damping device having the following structure. That is, a vibration damping device for a structure that is installed at a predetermined position of the structure and suppresses vibrations that are excited by the structure due to an external force such as an earthquake or a wind. A first vibration suppression device configured to reduce a response of a high vibration component of the vibration, and a second vibration suppression device configured to reduce a response of a low frequency component, wherein the first vibration As the suppression device, a viscous body inserted between a plurality of structures that are relatively moved with the vibration of the structure is provided in each layer over a plurality of upper and lower layers of the structure, and the second vibration suppression is provided. As an apparatus, an inertial mass body movably installed in a horizontal direction, and an actuator installed between the inertial mass body and the structure and supporting the inertial mass body so as to be movable in a horizontal direction are provided. The thing is the predetermined It is characterized by comprising installed in position.

[Operation] In the present invention, when vibration is excited in a structure by an external force due to an earthquake, wind, or the like, a first vibration suppression device is provided over a plurality of layers of the structure, and in each layer, between structures of the structure. The viscous body inserted respectively reduces the response of the high frequency component, and the second vibration suppression device including the inertial mass body and the actuator installed at a predetermined position of the structure has a low frequency component. To reduce the response.

By installing the first vibration suppression device composed of the plurality of viscous bodies and the second vibration suppression device composed of the inertial mass body and the actuator at predetermined positions of the structure, respectively, the low vibration due to their synergistic effect is achieved. It is possible to satisfactorily reduce the response in the entire frequency range from several components to high frequency components.

[Embodiment] FIGS. 1 to 6 show an embodiment of the present invention. In these drawings, reference numeral A denotes a structure on which a structure vibration damping device (hereinafter, simply referred to as a vibration damping device) B according to the present invention is mounted.

The structure A includes a unit 3 having a structure 2 inside the structure 1 and relatively moving independently of the structure 1.
Are vertically stacked in large numbers. Here, the structure 1 is composed of, for example, columns, beams, and outer walls, and the structure 2
Is composed of, for example, beams and inner walls. This structure A
Is mounted with a vibration damping device B. The vibration suppression device B includes a viscous body 4 as a first vibration suppression device, and a vibration suppression device 10 as a second vibration suppression device.

As shown in FIG. 1, the viscous body 4 is provided on each layer of the unit 3 in which a large number of the units 3 are stacked in the structure A.
And the structure 2.

The viscous body 4 is formed of a rectangular plate having viscosity and high vibration damping performance.
1a is fixed to the bottom surface 5, and the lower surface 4b is the upper surface 6 of the structure 2.
It is fixed to.

The viscous body 4 only needs to have a property of permitting and suppressing the relative movement of the structures 1 and 2 when the structures 1 and 2 are relatively moved by the lateral vibration generated in the structure A. For example, a mixture of asphalt and rubber, a synthetic rubber, a natural rubber, a soft resin, a silicon-based viscoelastic body, and the like are suitably used. The shape of the viscous body 4 is desirably plate-like from the viewpoint of workability.

Further, in the structure A, a vibration damping device B is configured at a position near a rooftop where it can be assumed that there is the greatest effect on vibration having a low frequency component caused by the structure A due to an earthquake or strong wind. A vibration suppression device 10 is provided.

The vibration suppressing device 10 is installed between an inertial mass body 11 that is installed so as to be movable in the horizontal direction, and a column 12 provided on the inertial mass body 11 and the structure A, and moves the inertial mass body 11 in the horizontal direction. And a sensor for sensing the speed and displacement of vibration excited by the structure A
It is composed of fourteen.

As a control law of the vibration suppression device 10, a feedback method is adopted in which the sensor 14 senses the speed and displacement of the structure A and determines the control force U to be applied to the structure A based on the optimal control theory. The control force U is supplied to the structure A by the actuator 13 using the inertial mass 11 as a reaction force.

Here, when an earthquake acts on the structure A, a sinusoidal vibration due to a low frequency component included in the seismic motion is excited in the structure A. This vibration is sensed by the sensor 14, and information on the vibration is transmitted to a control unit (built-in computer) not shown. The control unit calculates the magnitude, phase, natural period, etc. of the vibration of the earthquake based on this information, and calculates the magnitude, phase, period, etc. of the vibration, which are the appropriate operating conditions of the actuator 13. By operating the actuator 13 under appropriate operating conditions, the control force U can be supplied to the structure A using the inertial mass body 11 as a reaction force.

Next, results of a simulation analysis performed by the present inventors to verify the effects of the present invention will be described.

As the vibration model, a 20-mass vibration model assuming a 100-story high-rise structure as shown in Fig. 2 was used. Here, the feedback control of only the speed response is performed as the active control force U acting on the highest floor, and the damping constant h of the structure is obtained.
Was increased by 9%. Also,
As the viscous body V inserted between the floors, a viscous body V that increases the primary damping constant of the structure by 0.5% was used. The input seismic wave was an ElCentroNS wave whose maximum acceleration was normalized to 100 Gal. Here, FIG. 2 (b) shows the weight (t) and stiffness (t / cm) of each mass point when the damping model is of Rayleigh type and the primary and secondary damping constants are each 1%. Each value is shown.

Next, the results of the simulation analysis will be described with reference to FIGS.

FIG. 3 is a graphical representation of the uncontrolled response over time at the top of the structure. Here, FIG. 4A shows the displacement response (cm), and FIG. 4B shows the acceleration response (Ga).
l) and (c) show the input seismic wave (Gal). This input seismic wave was set based on an earthquake that occurred in the United States on May 18, 1940, and is an ElCentroNS wave with the maximum acceleration normalized to 100 Gal.

FIG. 4 shows a case where only the active control force U is applied to the top of the structure, and FIG. 5 shows a case where only the viscous body V is inserted into the structure. Fig. 7 shows the temporal change of the response at the top of the structure in each case where the active control force U is applied to the top of the structure and the viscous material V is inserted at each floor of the structure.

As a result of comparing and examining the results of the above simulation analysis, the following became clear.

When only the active control force U is applied, the displacement response can be reduced, but the acceleration response cannot be reduced so much due to the high frequency component.

When only the viscous body V is inserted into the structure, the acceleration response can be reduced, but the effect of reducing the displacement response is not so large.

Applying an active control force U to the top of the structure; and
When the viscous material V was inserted into each floor of the structure, it was recognized that both the displacement response and the acceleration response had a large response reduction effect.

As described above, according to the embodiment, the viscous body 4 inserted between the plurality of structures 1 and 2 which are relatively moved with the vibration of the structure A, and the structure A An inertial mass 11 installed at the top of the unit so as to be movable in the horizontal direction, and an actuator installed between the inertial mass 11 and the structure 1 of the structure A to support the inertial mass 11 so as to be movable in the horizontal direction. 13, the vibration is excited in the structure A by an external force due to an earthquake, wind, or the like, and is inserted between the structures 1 and 2 of the structure A, respectively. The viscous body 4 reduces the response of the high frequency component, and the vibration suppression device 10 including the inertial mass body 11 and the actuator 13 installed at a predetermined position of the structure A reduces the response of the low frequency component. Reduce. Therefore, the response in the entire frequency range from the low frequency component to the high frequency component can be satisfactorily reduced by these synergistic effects.

Therefore, the vibration in the entire frequency range caused by the external force such as an earthquake or a strong wind can be effectively controlled, and the safety measures at the time of an earthquake or a strong wind can be further improved.

[Effects of the Invention] As described in detail above, according to the present invention, a structure of a structure which is installed at a predetermined position of the structure and suppresses vibration excited by the structure by an external force such as an earthquake or wind. A vibration suppression device, wherein the vibration suppression device includes a first vibration suppression device for reducing a response of a high vibration component of the vibration of the structure, and a second vibration suppression device for reducing a response of a low frequency component. And the first vibration suppressing device is inserted between a plurality of structures that are relatively moved with the vibration of the structure over a plurality of upper and lower layers of the structure. The viscous material is provided in each layer, and the second
The vibration suppressing device of (1) includes an inertial mass body arranged to be movable in the horizontal direction, and an actuator installed between the inertial mass body and the structure to support the inertial mass body so as to be movable in the horizontal direction. The structure described above is installed at a predetermined position of the structure, and when vibration is excited in the structure by an external force due to an earthquake, wind, or the like, the first
The viscous body inserted between the structures of the structure as a vibration suppressing device reduces the response of high frequency components, and includes an inertial mass body and an actuator installed at a predetermined position of the structure. The second vibration suppression device reduces the response of the low frequency component. Therefore, the response in the entire frequency range from the low frequency component to the high frequency component can be satisfactorily reduced by these synergistic effects.

In addition, since the viscous body, which is the first vibration suppression device, is provided over a plurality of layers of the structure, it is possible to efficiently and reliably exhibit a response reduction effect over the entire structure.

Therefore, vibrations in the entire frequency range caused by the structure due to external force such as an earthquake or a strong wind can be effectively controlled, and safety measures at the time of an earthquake or a strong wind are further improved.

[Brief description of the drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a schematic explanatory view of a vibration damping device, FIG. 2 (a) is a diagram of a vibration model, and FIG. Fig. 3A is a diagram of the weight and stiffness of each mass point of the Rayleigh type damping model, Fig. 3A is a diagram of a displacement response in an uncontrolled state, Fig. 3B is a diagram of the acceleration response,
4C is a diagram of the input seismic wave, FIG. 4A is a diagram of the displacement response when only the active control force U is applied, FIG. 4B is a diagram of the acceleration response, and FIG. FIG. 6A is a diagram of a displacement response when only the viscous body V is inserted, FIG. 6B is a diagram of the same acceleration response, and FIG. 6A is a diagram in which an active control force U is applied. In addition, a diagram of the displacement response when the viscous body V is inserted, and FIG. 2B is a diagram of the acceleration response. A: Structure, B: Vibration damper, 1, 2 ... Structure, 4 ...
... viscous body, 10 ... vibration suppression device, 11 ... inertial mass body, 13
... Actuator.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshihiro Kurita, Inventor 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Keiji Shiba 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu (56) References JP-A-1-207574 (JP, A) JP-A-1-315566 (JP, A) JP-A-64-58777 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) E04H 9/02 F16F 15/02

Claims (1)

(57) [Claims] 1. A vibration damping device for a structure, which is installed at a predetermined position of the structure and suppresses vibration excited by said structure due to an external force such as an earthquake or a wind. A first vibration suppression device for reducing a response of a high frequency component of the vibration of the structure, and a second vibration suppression device for reducing a response of a low frequency component; As one vibration suppressing device, a viscous body that is inserted between a plurality of structures that are relatively moved with the vibration of the structure is provided in each layer over a plurality of upper and lower layers of the structure. As a vibration suppressing device, comprising: an inertial mass that is installed movably in the horizontal direction; and an actuator that is installed between the inertial mass and the structure and that supports the inertial mass so as to be movable in the horizontal direction. Of the structure is Damping device of a structure characterized by comprising installed in a fixed position.