JPH01318670A - Vibration control structure of structure - Google Patents

Abstract

PURPOSE:To effectively absorb the higher mode vibration of structure by a method in which vibration controllers each of which consists of a liquid tank of a liquid injected in an open-liquid face-forming manner are set on the upper and lower places of a structure. CONSTITUTION:When a structure constituting a superhigh tall building is vibrated, vibration controllers 5 set on the top are vibrated, where a liquid 5b moves in a rocking manner in the longitudinal direction WD of the moving water face 5f synchronously with the vibration of the structure to absorb the vibrating energy of the superhigh building. When the liquid 5b is also moved in a rocking manner, it passes vertically through the inner meshes 5c of a liquid tank 5, as shown by arrow AR, where the movement of the liquid 5b is limited by the viscous resistance to absorb the vibrating energy. When the vibration of the structure reaches more than a given value and the top 5j of waves 5i reaches the cover, the waves 5i collide with a wave breaker 5h to absorb vibrating energy.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an allocating device capable of suppressing vibrations of structures caused by wind, earthquakes, and the like.

(b), Prior Art Recently, in structures such as observation towers, high-rise residential buildings, and high-rise office buildings, where the primary natural vibration period of flexible structures is relatively long, the structure is located near the top of the structure. In order to absorb the vibration energy of objects, a damping device containing a liquid with an open water surface is installed, and the shaking of the structure caused by wind or earthquakes is reduced by the pressure generated by the sloshing of the liquid. is being carried out.

(C) 0 Problems to be Solved by the Invention However, in the natural vibration that occurs in a structure, in addition to the first ignition component, there are second-order and third-order higher-order components.

Moreover, since the vibration mode of such higher-order components is different from the first-order vibration mode, it is inconvenient that sufficient vibration damping performance cannot be obtained simply by installing a vibration damping device on the top of the structure. There is.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a vibration damping structure for a structure that can effectively absorb not only the vibration of the primary ignition component but also the vibrations of secondary and higher order components. It is something to do.

(d) Means for solving the zero problem, that is, the present invention provides a vibration damping system N( 5) are installed in the vertical direction of the structure (3).

Furthermore, the present invention provides a vibration damping device consisting of a liquid tank (5a) having a liquid (5b) injected to form an open liquid surface (5f). It is configured by installing it in the sections (Ml, M2, M3, M4, M5, M6).

Furthermore, the present invention provides a vibration damping device (5) consisting of a liquid tank (5a) having a liquid (5b) injected to form an open liquid surface (5f). It is constructed by installing multiple pieces in different shapes in the vertical direction of the structure (3).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The following r (el
The same applies to the column ``, action''.

(e) Zero effect With the above-described configuration, the present invention allows the vibration damping device (5) installed in the vertical direction to appropriately absorb first-order or higher-order vibrations occurring in the structure (3). act.

(f), Example Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a diagram showing an example of a structure in which an embodiment of the vibration damping structure according to the present invention is used, Fig. 2 is a perspective view showing an example of the arrangement of a vibration damping device, and Fig. 3 is a diagram showing a vibration damping device. 4 is a front sectional view of the damping device shown in FIG. 3, FIG. 5 is a plan view showing another embodiment of the damping device, and FIG. 6 is a plan view of the damping device shown in FIG. A front sectional view of the vibration damping device, FIG. 7 is a plan view showing yet another embodiment of the vibration damping device, FIG. 8 is a front sectional view of the vibration damping device of FIG. 7, and FIG. 9 is a front sectional view of the vibration damping device. A perspective view showing another arrangement example, FIG. 10 is a plan view of FIG. 9, FIG. 11 is a plan view showing still another arrangement example of the vibration damping device, and FIG. 12 is a plan view showing still another arrangement example of the vibration damping device. FIG. 13 is a front view showing another example of a structure in which a vibration damping device is used; FIG. 14 is a plan view showing yet another example of the arrangement of the vibration damping device; FIG. 15 16 is a front sectional view showing yet another example of the vibration damping device; FIG. 17 is a front sectional view showing yet another example of the vibration damping device. 18 to 20 are diagrams showing various vibration modes of the structure, FIG. 21 is a front view showing one embodiment of the damping structure, and FIG. 22 is another embodiment of the distribution structure. FIG.

As shown in FIG. 1, a super high-rise building 1, which is a structure, has a structure 3 erected on the ground 2, and a vibration damping device 5 according to the present invention is installed on the top 3a of the structure 3. is set up.

As shown in FIG. 2, two damping devices 5 are installed at right angles to each other, and each vibration damping device 5 has a lid on the top, as shown in FIGS. It has a liquid tank 5a with a rectangular planar shape in which 5g is provided.'?!r
Water or a liquid 5b having a viscosity equal to or greater than water is injected into the liquid tank 5a. The wave water surface 5f on which the liquid 5b oscillates is formed into a flat rectangular shape.

Furthermore, meshes 5c as damping members made of stainless steel, vinylon, high-performance fibers, etc. are installed on both left and right sides of the liquid tank 5a in FIG. At the top, on both sides of the lid body 5g, a wave dissipating device 5 is installed.
h and 5h are provided. The wave dissipating device 5h may be a block-shaped piece of iron scrap, crushed stone, metal chips, etc., or a porous mesh assembly 5m formed by laminating a plurality of meshes 5k in the horizontal direction, as shown in Fig. 17. It is constructed from quality materials.

Since the superhigh-rise building 1 has the above-described configuration, when the structure 3 shakes due to an earthquake, strong wind, etc., the vibration damping device 5 installed at the top 3a also shakes. Then, as shown in FIGS. 3 and 4, the liquid 5b in the vibration damping device 5 moves in the longitudinal direction WD of the wave water surface 5f in synchronization with the vibration of the structure 3.
to sway.

In other words, the oscillation period of the liquid 5b (the oscillation period of the liquid 5b is determined by the length Ll in the long side direction of the liquid tank 5a and the filtrate height in the stationary state of the liquid 5b, as shown in FIGS. 3 and 4). By making the period (determined by Absorb energy. When the liquid 5b swings,
Due to this rocking, the liquid 5b passes through the mesh 5C installed in the liquid tank 5a in the vertical direction in FIG. The viscous resistance that acts between the liquid 5b and the liquid 5b acts in a direction that restricts the movement of the liquid 5b. As a result, the vibration of the liquid 5b is attenuated, and the ability to absorb vibration energy is improved.

Furthermore, when the shaking of the structure 3 exceeds a predetermined value, the wave height of the liquid 5b in the vibration damping device 5 also increases, and as shown in FIG. 4, the wave 51 reaches the lid 5g. Become.

However, if the crest 5 of the wave directly hits the lid 5g and bounces back, the period of the liquid 5b will be disturbed, making it impossible to exhibit an appropriate vibration damping effect. However, when the top 5J of the wave 51 occurs, wave breakers 5h and 5h are installed on both sides of the liquid tank 5a in the wave direction, and when the wave 51 collides with the wave breaker 5h, the wave 51 falls inside the wave breaker 5h. The energy flows in a distributed manner into the numerous pores of the porous member, and its energy is effectively absorbed, without creating waves due to bounce that would disrupt the wave cycle in the tank. Furthermore, it is also possible to prevent the lid 5g from being deformed due to excessive pressure being generated on the lid 5g due to the direct light of the waves on the lid 5g. Therefore, the vibration damping device 5 can smoothly absorb vibrations.

In addition, although the above-mentioned example described the case where the mesh 5C is used as a damping member provided in the liquid tank 5a, the damping member can damp the swing of the body 5b in the liquid tank 5a. As far as possible, it may be of any form or shape, and may be installed in any manner. For example, the mesh 5C may be placed in a liquid tank 5a as shown in FIGS. 5 and 6.
A plurality of them may be installed so as to be separated in the vertical direction as shown in FIG. Furthermore, as shown in FIG. 16, the mesh 5C is placed in the liquid tank 5a.
Of course, it is also possible to provide them in an appropriate combination in the vertical and horizontal directions.

In addition, not only mesh 5C, but examples such as Figures 7 and 8.
As shown in the figure, in the liquid tank 5a, the wave direction of the liquid 5b,
That is, a partition wall 5d is provided in a form divided in the left and right direction in the figure (divided into a plurality of parts like the waving water surface 5fl), and a protrusion 5 is provided on the partition wall 5d.
A large number of e are shaped to match the oscillation form of the liquid 5b (i.e.,
For example, as shown in FIG. 8, it is of course possible to implant the protrusion 5e in a concave shape so that the vibration of the liquid 5b is damped by the viscous resistance generated between the protrusion 5e and the liquid 5b. . Furthermore, it is also possible to install something in the form of steel chips, a plastic molded product, etc. as a damping member in the liquid tank 5a.

Further, the manner in which the damping device 5 is arranged can be appropriately selected depending on the location and the required damping performance. That is, M
Since the wave motion of the body 5b occurs in the longitudinal direction of each vibration damping device 5,
By installing the wave water surface 5f of each vibration damping device 5 in the longitudinal direction WD toward at least two directions of the building 1 where vibrations are to be absorbed, each vibration damping device 5 is provided with the shaking separated into at least two directions. It is possible to exert a large vibration damping effect. For example, as shown in FIGS. 9 and 10,
It is also possible to arrange the plurality of vibration damping devices 5 so that the longitudinal direction WD, which is the wave forming direction of the wave water surface 5f, faces two horizontal directions that are perpendicular to each other. By doing so, it becomes possible to effectively absorb the shaking that occurs in the building 1 in two directions at right angles. Furthermore, as a mode of installation of the vibration damping bag@5, it is also possible to arrange a large number of vibration damping devices 5 along the outer wall 1a of the building 1, as shown in FIGS. 11 and 15. (In the case of Fig. 15, it is also placed in the center of the building 1.) In such a case, the top 3a of the building 1
Even if there is existing equipment such as an elevator machine room,
It becomes possible to install the vibration damping device 5 without using such existing equipment, and furthermore, it becomes possible to effectively utilize the building space. Further, in the case of a building 1 having a circular planar shape, a large number of vibration damping devices 5 may be arranged along the circular outer wall 1a, as shown in FIG. Furthermore, the 14th
As shown in the figure, it is naturally possible to arrange the damping devices 5 radially. In addition, if the damping device 5 is arranged along the outer wall 1a of the building 1 with a large amplitude, it is possible to significantly enhance the damping effect.

In addition, as structures to which the vibration damping bag W5 according to the present invention is applied, structures with a flexible structure and a relatively long vibration period are suitable, and in addition to the super high-rise building 1 as shown in FIG. Of course, the present invention can also be applied to a tower 6 made of a steel frame or the like as shown in FIG. 13.

The amount of the liquid 5b in the liquid tank 5a is such that the weight of free water that contributes to rocking is 0.5 to 2% of the weight of the structure (the greater the weight of free water, the higher the damping effect), and the damping member. If the damping constant is about 2 to 10%, the distribution effect can be achieved.

Further, in the above embodiment, the wave dissipating device 5h is provided on both sides of the liquid tank 5a in the wave direction WD, but the ura wave device 5h is not limited to both sides of the liquid tank 5a, and is not always provided in the liquid 5b. It is possible to provide it anywhere as long as it is provided in a portion that is not immersed in water. For example, it is naturally possible to provide it on the entire upper surface or the entire side wall of the liquid tank 5a.

In addition, the vibration modes that occur in the structure 3 include, in addition to the primary vibration mode, higher-order modes such as secondary and tertiary modes.
Their vibration modes (for example, the first mode is the 18th mode)
As shown in the figure, the mode is such that the maximum amplitude portion M1 appears at the upper end of the structure 3 (in FIGS. 18 to 20, the structure 3 is
(displayed in a straight line). However, as shown in Fig. 19, the second-order vibration mode is different from the first-order vibration mode due to the large IC.
In contrast, the maximum amplitude portions M2 and M3 occur not only at the upper end of the structure 3 but also at a slightly lower central portion.

Furthermore, in the third-order vibration mode, as shown in Figure 20,
Maximum amplitude parts M4, M5, M6 (the upper end of the structure 3,
Occur in the upper middle and lower middle regions respectively.

Therefore, simply installing the vibration damping device 5 on the top of the structure 3 is very effective against primary vibrations, but may lack effectiveness against higher-order vibrations such as secondary vibrations. .

Therefore, as shown in FIG.
, a vibration damping device 5 in which a liquid 5b is not stored has a oscillation period corresponding to (usually coincident with) the primary natural frequency of the structure 3.
At the same time, a liquid 5 having an oscillation period corresponding to (usually coincident with) the second-order natural frequency of the structure 3 is placed in the maximum amplitude parts M2 and M3 of the second-order natural vibration of the structure 3.
A vibration damping device 5B in which b is stored is installed. Note that the liquid tank 5a constituting the vibration damping device 5 can be made smaller as the oscillation period of the stored liquid 5b becomes shorter, and thus the vibration frequency becomes higher.

By doing so, in the structure 3 shown in FIG. 21, the primary vibration that occurs during an earthquake or the like can be effectively absorbed by the vibration damping device 5A, and the secondary vibration can be effectively absorbed by the vibration damping device 58. Furthermore, in order to improve the allocation performance, vibration damping devices 22A and 22 shown in FIG.
In addition to the damping operation for the primary and secondary vibrations by 8, as shown in Fig. 22, the maximum amplitude portions M4, M5, and M6 of the 3rd natural vibration correspond to the 3rd natural frequency of the structure 3. a liquid 5b having a (usually coincident) oscillation period;
If the vibration damping device 5° is installed, the damping performance of the structure 3 will be extended to the third-order natural vibration part.

(g) 1 Effect of the invention As explained above, according to the invention, the wave water surface 5f
Since a plurality of vibration damping devices 5.5A, 5B, and 5o each consisting of a liquid tank 5a having a liquid 5b injected to form an open liquid surface such as 5.5A, 5B, and 5o are installed in the vertical direction of the structure,
It is possible to effectively suppress vibrations of structures that exhibit complex vibration modes and include higher-order natural vibrations.

In addition, a vibration damping device consisting of a liquid tank 5a having a liquid injected to form an open liquid surface is installed at the maximum amplitude portions M1 and M2 of the first natural vibration and at least the second natural vibration of the structure.
, M3, M4, M5, and M6, it is possible to exhibit the allocation performance at the maximum amplitude part for vibrations in which vibrations of different modes are mixed, and to effectively exhibit the vibration damping effect. You can do it.

Further, a plurality of vibration damping devices each consisting of a liquid tank 5a having a liquid injected to form an open liquid surface are installed in the vertical direction of the structure, with the liquid tanks having different sizes. This eliminates wasted space at each position where the liquid tank is installed, and makes it possible to effectively utilize the limited space of the structure.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a structure in which an embodiment of the vibration damping structure according to the present invention is used, Fig. 2 is a perspective view showing an example of the arrangement of a vibration damping device, and Fig. 3 is a diagram showing a vibration damping device. 4 is a front sectional view of the damping device shown in FIG. 3, FIG. 5 is a plan view showing another embodiment of the damping device, and FIG. 6 is a plan view of the damping device shown in FIG. A front sectional view of the vibration damping device, FIG. 7; a plan view showing still another embodiment of the vibration damping device; FIG. 8 is a front sectional view of the vibration damping device of FIG. 7; FIG. 9 is a front sectional view of the vibration damping device FIG. 10 is a plan view of FIG. 9, FIG. 11 is a plan view of yet another arrangement of the damping device, and FIG. 12 is a plan view of yet another arrangement of the vibration damping device. FIG. 13 is a front view showing another example of a structure in which the damping device is used; FIG. 14 is a plan view showing yet another example of the arrangement of the damping device; FIG. FIG. 16 is a front sectional view showing yet another embodiment of the vibration damping device; FIG. 17 is a front sectional view showing still another embodiment of the vibration damping device; Figures 18 to 20 are diagrams showing various vibration modes of the structure, Figure 21 is a front view showing one embodiment of the vibration damping structure, and Figure 22 is a front view showing another embodiment of the vibration damping structure. It is a diagram. 1. Structure (high-rise building) 3. Structure 5... Vibration damping device 5a... Liquid tank 5b... Liquid 5C... Damping member (medish) 5d - Damping member (partition wall) 5e... Damping member (protrusion) 5f... Open liquid level (wave water surface) 5h... Wave dissipating device 51c... - Metosh 5m - Porous member (mesh aggregate) 6 - Structure (
Tower) Ml, M2, M3, M4, M5, M6... Maximum amplitude portion Applicant Mitsui Construction Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 2 others) Figure 13 Figure 1 Figure 2 Figure 5 Figure 3 Figure 9 Figure 10 Figure 12 Figure 14 Figure 17 Figure 21 Figure 22

Claims (7)

[Claims] (1) In a structure that has a structure that vibrates horizontally at a natural frequency during an earthquake, etc., multiple vibration damping devices consisting of liquid tanks containing liquid injected to form an open liquid surface are installed. A vibration damping structure for a structure that is installed vertically above and below the structure. (2) In a structure that has a structure that vibrates horizontally at a natural frequency during an earthquake, etc., a vibration damping device consisting of a liquid tank containing liquid injected to form an open liquid surface is installed. A vibration damping structure for a structure that is installed at the maximum amplitude part of the second-order natural vibration and at least the second-order natural vibration. (3) In a structure that has a structure that vibrates horizontally at a natural frequency during an earthquake, etc., a vibration damping device consisting of a liquid tank containing liquid injected to form an open liquid surface is installed in the structure. A vibration damping structure for a structure that consists of multiple liquid tanks of varying sizes installed vertically on the structure. (4) A vibration damping structure for a structure according to claim 1, 2 or 3, wherein the liquid tank is provided with a damping member that damps vibrations of the liquid. (5) A vibration damping structure for a structure according to claim 1, 2 or 3, which is constructed by providing a wave dissipating device in a part of the liquid tank that is not always immersed in liquid. . (6) A vibration damping structure for a structure according to claim 1, 2 or 3, wherein the wave dissipating device is made of a porous member. (7) A vibration damping structure for a structure according to claim 6, wherein the porous member is constituted by a mesh aggregate formed by laminating a plurality of meshes in the horizontal direction.