JPH06300081A - Vibration damping support structure - Google Patents

Abstract

PURPOSE:To provide a vibration damping support structure for absorbing and restraining even a small vibration due to wind, etc., besides a large vibration such as a large earthquake. CONSTITUTION:In structures 1, 2 having parts, in which a relative displacement is generated at the time of vibration, such as structures having a different frequency, a viscous damper 5 and a hysteresis damper are interposed between the structures or parts 1, 2, in which a relative displacement is generated, so that they can work in parallel with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system which is disposed between a portion which causes relative displacement of a structure having a portion which causes relative displacement during vibration, such as a boiler, a tower type chimney or upper and lower floors of a high-rise building. Vibration support structure.

[0002]

2. Description of the Related Art In a structure provided with a structure having different frequencies, such as a steel frame structure, a boiler suspended from the structure, a steel tower and a chimney supported by the structure, a space between structures which generate relative displacement during vibration is Generally, it is supported by the structure shown in FIG. That is, in the case of a boiler or a tower-type chimney, as shown in FIG. 3A, a steel convex portion that slides between the structures 01 and 02 that try to move differently in the height direction so as to be thermally expandable and contractible. 03 and recess 04 are provided so that relative displacement in the horizontal direction does not normally occur, but in the event of a large earthquake, the projection 03 or recess 04 is plastically deformed to absorb the vibration energy and suppress the vibration of the entire structure. In some cases, a vibration-damping support structure is used. Also, in the case of a high-rise building, when a horizontal friction damper 05 is connected between the upper and lower floors, as shown in FIG. 2B, and a vibration damping support structure that operates only during a large earthquake is used. There is also.

[0003]

However, as shown in FIG.
In the case of the vibration damping support structure shown in Fig. 3, any vibration damping structure operates only during a large earthquake to absorb vibration energy and suppress vibration, but for relatively small vibration such as wind vibration, steel materials, friction dampers, etc. With a hysteresis-type damper that does not operate unless a large force acts, such as, no vibration damping effect occurs. By the way, if such a small vibration continues, there is a problem that the material is fatigued and the strength is deteriorated in the case of a structure, and the habitability in the building is further deteriorated in the case of a high-rise building. .

The present invention has been proposed in view of such circumstances, and an object thereof is to provide a vibration-damping support structure that simultaneously absorbs and suppresses not only vibrations during a large earthquake but also small vibrations due to wind or the like. To do.

[0005]

To this end, the present invention provides a structure having a portion where relative displacement occurs during vibration, such as a structure having structures having different frequencies, between the structures or portions where the relative displacement occurs. In addition, a viscous damper and a hysteretic damper are interposed so that they can be operated in parallel.

[0006]

According to such a structure, the viscous damper, of the two types of dampers provided so as to be able to operate in parallel between the structures or places where relative displacement occurs during vibration, is the initial stage generated between the two structures. It mainly acts to damp small vibrations.
The other hysteresis damper absorbs vibration energy by utilizing a large resistance force due to elastic-plastic deformation or frictional force of a member when the clearance exceeds a set clearance, and suppresses vibration. By linking the actions of both of the above, it is possible to maintain a continuous vibration damping action for both small vibrations and large vibrations occurring in the structure and to damp the vibrations of the structure. It also allows the structure to have a lightweight structure.

[0007]

1 is a side view showing the first embodiment of the present invention, and FIG. 2 is a side view showing the second embodiment of the vibration damping support structure of the present invention. 3 is shown in FIG.
6 is an enlarged view showing a main part of FIG. 4, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is an overall plan view showing an embodiment in which the vibration-damping support structure of FIG. 1 is applied to a tower support chimney. 5 is an overall side view of the steel tower support chimney of FIG. 5, FIG. 7 is an overall side view of an embodiment in which the vibration control support structure of FIG. 1 is applied to a boiler support frame, and FIG. 8 is the vibration control support structure of FIG. FIG. 9 is an overall side view showing an embodiment applied between layers, and FIG. 9 is a graph showing a comparison of vibration damping action between the support structure according to the present invention and each conventional support structure shown in FIG.

First, in FIG. 1, reference numerals 1 and 2 denote a high-frequency structure, a low-frequency structure, and a one-structure 1 which generate relative displacement during vibration in a boiler, a tower-type chimney, or a high-rise building. Rigid convex portions 4 provided on the side, 4 are rigid supporting portions that project from the other structure 2 so as to face the side portions of the convex portions 3,
Reference numeral 5 is an oil damper, that is, a viscous damper, interposed between the convex portion 3 and the support portion 4, and 6 is an elasto-plastic material such as a steel material or a lead material 7 having a member cross section set by projecting at the end of the convex portion 3. An elasto-plastic damper, that is, a hysteresis-type damper, comprising 7 and rigid stoppers 8 and 8 projecting from the other structure 2 so as to face each other with a clearance set on both sides of the elasto-plastic material 7. The oil damper 5 and the elasto-plastic damper 6 are respectively installed in two directions at right angles in the horizontal plane so as to operate together in parallel with the vibration of the structure 1 or 2 as shown in the figure.

In the first embodiment shown in FIG. 1, now,
When the structure 1 moves to the right as shown by the arrow, its vibration is damped by the viscous resistance of the oil damper 5 with the structure 2 as a support. The oil damper 5 also flexes due to viscous resistance even with large vibrations of the structure, but is less effective in suppressing large vibrations. When the vibration of the structure progresses to the right, the elasto-plastic material 7 comes into contact with the stopper 8 and bends as shown by the broken line, and the resistance force at the time of deformation absorbs the vibration of the structure 1 and suppresses the vibration. It exerts a strong damping force. That is, the oil damper 5 and the elasto-plastic damper 6 act simultaneously at the same time, and this action works alternately on the left and right,
Both the small vibration and the large vibration of the relative displacement vibration generated in the structure 1 can be simultaneously attenuated, and the vibration of the structure can be suppressed.

Next, in a second embodiment shown in FIG. 2, in the structure shown in FIG. 1, an elasto-plastic material 7 is attached to the end of the convex portion 3 on the structure 1 side.
In place of the friction cylinder 17, a hysteresis type damper is used, and the friction damper 16 is configured by providing stoppers 8 on the structures 2 facing each other with a clearance set on both sides of the rod end of the friction cylinder 17. ing.
The friction cylinder 17 is well known, for example, as shown in FIGS.
As shown in FIG. 5, the rod 12 that is in contact with the friction member 11 is slidably provided on the inner surface of the cylindrical body 10, and when the rod 12 is pushed to the left or right in contact with the stopper 8, the friction member 11 is acted by the action of the wedge member 13. A strong frictional resistance is generated between the inner surface of the cylindrical body 10 and the inner surface of the cylindrical body 10. As a result, in FIG.
When the convex portion 3 of the structure 1 vibrates to the right, the rod 12 moves together with the tubular body 10, and the end of the rod 12 contacts the stopper 8 and is pushed leftward, so that the wedge member 13 acts to cause friction with the friction member 11. It is pressed against the inner surface of the cylindrical body 10 to generate a strong frictional force and damp the vibration. The same applies to the opposite direction. Therefore, also in the embodiment of FIG. 2, the oil damper 5 and the friction damper 16 act together at the same time as in the first embodiment, and the vibration of the structure can be damped and suppressed.

FIGS. 5 and 6 show a case where the vibration damping support structure of the first embodiment is applied between the tubular body 21 and the supporting iron tower 22 of the tower type chimney, and here the supporting structure of FIG. S
1, the supporting structure of FIG. 2 type is shown by reference numeral S2. Figure 1
Two supporting planes of one height are shown, and two sets of damping support structures S1 are symmetrically arranged in the plane in two directions at right angles, and the arrangement of such supporting structures S1 is as shown in FIG. It is provided at each node height.

Similarly, FIG. 7 shows a case where the vibration damping support structure S1 of the first embodiment is applied between the industrial boiler 31 and its support frame 32, and the vibration damping support structure S1 is appropriately in a horizontal plane according to the shape of the boiler 31. The support structures S1 are provided on both sides in two directions at right angles to Further, FIG. 8 shows a vibration damping support structure S2 of the second embodiment type.
Is applied between the floors of the high-rise building 40 and is arranged in two directions at right angles on each floor. The damping support structures S1 and S2 according to the present invention can be applied to the above-mentioned objects as well as structures having a portion which causes relative displacement during vibration and general constructions in suitable embodiments.

Finally, FIG. 9 shows a comparison of the vibration response of the conventional non-damping structure, viscous type structure, hysteresis type structure and the vibration damping structure of the present invention on the structure side to the external vibration force. As shown by the chain double-dashed line, the vibration support structure linearly produces a response vibration in proportion to the external vibration force. Here, in the case of a support structure that uses only viscous dampers, the vibration is reduced to nearly half compared to the above non-vibration structure with a constant viscous resistance, but a region where the vibration external force dangerous to the structure is high. In (dotted line part), the function of suppressing the vibration cannot be exerted on the structure. Further, the structure having only the hysteresis type damper shown in FIG. 10 does not have a damping action at the initial stage of vibration, and therefore a large shock is suddenly generated when the damping action occurs.

On the other hand, in the viscous and hysteretic type combined structure of the present invention, the damping force by the viscous damper works in the region where the external vibration force is low, and the hysteresis damper in the high external vibration force region where the hysteresis damper starts to operate. The strong damping force of is added and it continues to act, and the damping effect in the large vibration external force region is remarkably enhanced.

Therefore, in any of the above structures, the structure mutual action is achieved by the combined action of the continuous damping action of the viscous damper 5 and the damping action of the hysteresis damper 6 or 16 in the large vibration external force region. It is possible to efficiently reduce and suppress the vibration generated between the two. As a result, it is possible to reduce the vibration of the entire structure, improve the safety of the structure, and reduce the weight of the structure.

[0016]

In summary, according to the present invention, in a structure having a portion where relative displacement is generated during vibration, such as a structure having structures having different frequencies, a viscous material is present between the structures or portions where the relative displacement occurs. -Type damper and hysteretic damper are installed so that they can be operated in parallel, so that vibrations between locations or structures where relative displacement occurs can be reduced by the action of both the viscous damper and the hysteretic damper A vibration-damping support structure that continuously damps large areas, effectively suppresses large and dangerous large vibrations of the structure due to earthquakes, etc. to enhance the safety of the entire structure and enables the structure to be safely and lightly weighted. Therefore, the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a vibration damping support structure of the present invention.

FIG. 2 is a side view showing a second embodiment of the vibration damping support structure of the present invention.

FIG. 3 is an enlarged view showing a main part of FIG.

FIG. 4 is a transverse sectional view taken along the line IV-IV in FIG.

5 is an overall plan view showing an embodiment in which the vibration-damping support structure of FIG. 1 is applied to a steel tower support chimney.

6 is an overall side view of the steel tower supporting chimney of FIG.

7 is an overall side view showing an embodiment in which the vibration damping support structure of FIG. 1 is applied to a boiler support frame.

FIG. 8 is an overall side view showing an embodiment in which the vibration damping support structure of FIG. 2 is applied between layers of a high-rise building.

9 is a graph showing a comparison of vibration damping action between the support structure according to the present invention and each conventional support structure shown in FIG.

FIG. 10 is a side view showing a conventional damping support structure.

[Explanation of symbols]

 1 High-frequency structure 2 Low-frequency structure 3 Convex part on the structure 1 side 4 Support part on the structure 2 side 5 Oil damper (viscous damper) 6 Elastic-plastic damper (hysteretic damper) 7 Elastic-plastic material 8 Stopper 10 Cylindrical body 11 Friction member 12 Rod 13 Wedge member 16 Friction damper (hysteretic damper) 17 Friction cylinders S1, S2 Support structure of FIGS. 1 and 2 21 Chimney cylinder body 22 Support tower 31 Boiler 32 Support frame 40 High-rise building

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Imada 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Yasuo Oki 4-chome Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Mitsubishi Heavy Industries Ltd. Hiroshima Works

Claims (1)

[Claims] 1. In a structure having portions where relative displacement occurs during vibration, such as a structure having structures having different frequencies, a viscous damper and a hysteresis damper are provided between the structures or portions where the relative displacement occurs. A vibration-damping support structure characterized by being inserted so that they can operate in parallel.