JP3218529B2 - Damping structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure suitable for damping a high-rise building, especially a super-high-rise building.

[0002]

2. Description of the Related Art Conventionally, passive vibration damping structures proposed in many cases are intended to suppress deformation or response of a structure in which shear deformation is predominant. Specifically, it is a vibration damping structure in which a vibration damping device for absorbing vibration energy of a building is attached to a portion where shear deformation occurs. However, such a mechanism is hardly effective in suppressing the vibration of a structure in which bending is dominant as represented by a skyscraper. Because there is almost no interlayer deformation and bending of the entire structure occurs due to the accumulation of minute axial deformation of the columns, so even if the vibration damping device is installed on the scale, the vibration damping device hardly deforms and energy absorption Is rarely done.

[0003] Therefore, in a structure in which such bending deformation is predominant, a horizontal displacement caused by bending deformation is amplified by a secondary system as represented by a TMD (Tuned Mass Damper). Shaking means were taken. However, the TMD, which is a vibration damping device that simply adds a small additional mass to a structure, has the following problems. That is, there is a limit to the stroke of the vibration damping device, and it is impossible for a large earthquake. If the tuning of the period of the secondary system is not carefully performed, the effect will not be exhibited well. The problem is that the secondary system is only additional, and it is difficult to use it effectively because it has an incomplete quantity. In addition, such a problem becomes more remarkable as the rigidity of the structure increases.

Therefore, a vibration damping structure having the following megger sub mechanism has been developed for vibration damping of a structure having excellent bending. As shown in FIG. 8, the vibration damping structure having the mega-sub mechanism has a main structure 1 that resists its own weight and seismic force, and a secondary system for appropriately amplifying the deformation generated in the main structure 1. In order to fulfill the function, the main structure 1 is constituted by a sub-structure 3 suspended and supported by a suspending member 2 extending from the beam 1a, and the weight of the sub-structure 3 is equal to or greater than the weight of the main structure 1. A vibration damping device 4 is provided between the sub structure 3 and the main structure 1 (Japanese Patent Publication No. Hei 5-2073, Japanese Patent Application Laid-Open No. Hei 2-194279).
Reference). The vibration damping structure having such a mega-sub mechanism can be effectively used for vibration damping during a large earthquake. The displacement between the sub structure 3 and the main structure 1 can be reduced to a practical range. The vibration itself of the sub-structure 3 is also reduced, and there is an advantage that the sub-structure 3 which is a secondary system can be effectively used as a living space.

[0005]

However, even the vibration damping structure having the above-mentioned mega-sub mechanism has the following problems. That is, it is necessary to make the period of each sub-structure 3 longer than the period of the main structure 1 which is a larger structure. Therefore, the method of supporting the sub-structure 3 becomes a problem. In reality, it is considered that the suspension is suspended from the mega beam of the main frame. However, when the vibration damping device 4 is not sufficient and its capability is not sufficient, the vibration damping effect depends sensitively on the period of the substructure 3. And the robustness is poor. In addition, since the lengths of the suspending members 2 for suspending and supporting the sub-structure 3 are uniform, the natural frequency of the sub-structure 3 is determined to be a certain value, and the frequency of the vibration to be damped is described above. When the natural frequency of the substructure 3 deviates from the natural frequency, there is a problem that a good vibration damping effect cannot be obtained.

The present invention has been made in view of the above circumstances, and can improve the robustness of a vibration damping mechanism, and can prevent the substructure from resonating at a specific frequency. It is an object of the present invention to provide a vibration damping structure capable of performing vibration control.

[0007]

According to the first aspect of the present invention, a substructure defining a living room / living space has an upper part in a space formed inside a main structure composed of a main frame. The main structure is suspended by a plurality of suspending members extending from the beam, and the lower part thereof is accommodated while being suppressed from moving laterally by a vibration damping device interposed between the main structure and the lower part. As a plurality of suspension members for suspending one sub-structure, a plurality of types of suspension members having different lengths are used, and the sub-structure is vertically spaced from a plurality of columns.
A multi-layered structure including a plurality of beams to be arranged;
The upper end of the pillar of the structure is connected to the beam of the main structure,
And the nodes of the columns and beams of the substructure are
Structure and the pillars are
Roller support that supports the vertical load of the beam while allowing movement
Provided with two types of structure, the substantial length of the hanging material
Is determined .

[0008]

[0009]

According to the first aspect of the present invention, a plurality of suspension members for suspending the sub-structure are provided, and the lengths of the suspension members are appropriately varied so that the natural period of each portion of the sub-structure can be appropriately adjusted. Can vary. Here, the natural frequency f of the suspended part is determined by the suspended length L. f = (1 / 2π) (g / L)

Therefore, the natural frequency f of each part of the substructure is
Is determined so as to be appropriately distributed near the frequency at which the response is reduced. In FIG. 5, the central Mc is made to match the frequency f ₀ at which the response is reduced, and the shorter suspended lengths Ma and Mb are set to the natural frequencies larger than the frequency f ₀ , and longer than Mc. The suspended lengths Md and Me are set to natural frequencies smaller than the frequency f ₀ .

As described above, by appropriately varying the natural period of each part of the sub-structure around a certain value, it is possible to avoid resonance of the sub-structure at a specific frequency, and furthermore, it is possible to reduce the vibration suppression effect. Sensitivity to the period of the substructure can be reduced.

Further, when the length of the suspension member is varied as described above, the suspension length may be determined so as to be synchronized with each natural frequency of the whole system. In FIG. 6, the natural frequency of each part in the substructure is set for the primary natural frequency, for the secondary natural frequency, for the tertiary natural frequency, and the like. Thereby, each order vibration mode of the whole structure system can be reduced.

[0013] Further , by providing the sub-structure as a multi-layer structure, forming a suspension member by the columns of the sub-structure, and providing two types of nodes of the columns and beams of the sub-structure, a rigid structure and a roller support structure, This is to determine the substantial length of the hanging member to a desired value, and the substantial length of the hanging member can be changed by a simple configuration.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a schematic configuration of a vibration damping structure according to the present invention. In the figure, reference numeral 10 is a main structure. The main structure 10 is a column 1 designed for long-term and short-term loads.
0a and a main frame having beams 10b. Main structure 1
In each of the upper and lower divided spaces formed inside 0,
The substructures 12A, 12B, ... that define the living space are
Plural suspension members 1 extending downward from beams 10b of the main structure
, And are housed with a clearance between the main structure 10 and the main structure 10. One substructure 12
A, 12B,..., A plurality of hanging members 13,.
Is not a fixed length as described later, but a plurality of types having different lengths are used.

Are provided between the lower ends of the substructures 12A, 12B,... And near the nodes of the columns 10a and the beams 10b of the main structure 10, whereby the substructures 12A, 12B,.
The relative displacement between A, 12B,... And the main structure 10 is suppressed. The vibration damping device 14 includes a main structure 10 and a sub structure 12.
A, 12B,... Converts and absorbs vibration energy based on the relative displacement between the elements A, 12B,. A viscous damper or the like is used. The weight of the sub-structures 12A, 12B,... Is set equal to or larger than the weight of the main structure 10.

The plurality of substructures 12A, 12B,...
7 is provided. Substructure 12A,
The upper ends of the columns 16 of 12B,.
0b to form the hanging member 13. And the hanging members 13 composed of the pillars 16 are:
The substantial length is set by the following means.

That is, the sub-structures 12A, 12B,
The joint between the column 16 and the beam 17 is a rigid structure 18A in which both are integrally joined as shown in FIG. 3, and the column 16 allows the beam 17 to move in the horizontal direction as shown in FIG. While beam 1
7 and a roller support structure 18B for supporting a vertical load. The length from the beam 10b of the main structure 10 to the first rigid structure 18A which is present downward is the substantial length of the suspension member 13. In FIG. 1, taking as an example the hanging member 13 of the uppermost sub-structure 12A, the substantial length of the leftmost hanging member 13 in FIG. 1 is La, and the second hanging member 13 from the left end is La. Is Lb, and the substantial length of the third suspending member 13 from the left end is Lc.

The roller support structure 18B will be additionally described. A reinforcing ring 20 is provided at an end of the beam 17. Reinforcing rings 20, 20 on either side of pillar 16
The parts are connected to each other with an expansion joint 21 with some freedom. The pillar 16 is provided with a floor receiving portion 22 projecting in four directions, and the reinforcing ring 20 is supported by the floor receiving portion 22 via a roller 23.

In the vibration damping structure having the above structure, when vibrations occur in the vibration damping structure due to an earthquake, wind, or the like, the natural periods of both the main structure 10 and the substructures 12A, 12B,. , The effect of suppressing the mutual response between the main structure 10 and the sub-structures 12A, 12B,... Due to the difference, avoiding resonance with respect to vibrations caused by disturbances ranging from short periods to long periods, Suppress the increase of shaking. Further, the main structure 10 and the sub-structures 12A, 12B,
Can absorb vibration energy and attenuate the vibration at an early stage.

Here, a plurality of suspension members 13 for suspending the substructures 12A, 12B,... Are used, and the substantial lengths of the suspension members 13 are different. The natural period can be appropriately varied.

Therefore, for example, by changing the substantial length of the suspending member 13, the natural frequency of each portion of the substructure is changed to a frequency (primary natural frequency) for reducing the response as shown in FIG. 7B, the sub-structures 12A, 1A can be appropriately distributed near the frequency.
2B,... Can be avoided for a specific frequency,
Thus, the apparent attenuation constant can be increased.
In addition, the sensitivity of the vibration damping effect to the period of the substructure can be reduced. FIG. 7A shows a vibration response characteristic of a conventional vibration damping structure.

When the lengths of the suspension members 13 are varied as described above, if the natural frequencies of the whole system are set so as to be synchronized with each other as shown in FIG.
As shown in (1), for example, resonance for both the primary natural frequency and the secondary natural frequency can be avoided.

[0023]

According to the first aspect of the present invention, a plurality of suspension members for suspending the sub-structure are provided, and the lengths of the suspension members are appropriately varied, so that each sub-structure has a unique portion. The period can be made to vary appropriately. For example, if the natural period of each part of the sub-structure is made to vary appropriately around a certain value, resonance of the sub-structure at a specific frequency is avoided. Accordingly, the apparent attenuation constant can be increased. In addition, the sensitivity of the vibration damping effect to the period of the substructure can be reduced. That is,
Robustness as a vibration damping mechanism can be improved. Further, when the length of the suspended material is varied as described above, if the suspended length is determined so as to be synchronized with each of the natural frequencies of the entire system, the vibration of each order of the entire structural system can be improved. Modes can be reduced.

Further, by the secondary structure is a multilayer structure, constitutes the suspension member by the pillars of the substructure, providing two types of the nodes of the columns and beams of the substructure rigid structure and the roller support structure, This is to determine the substantial length of the hanging member to a desired value, and the substantial length of the hanging member can be easily changed by a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a side view showing a rigid structure portion among nodes of columns and beams of the sub-structure of the embodiment.

FIG. 3 is a side view showing a roller supporting portion among the nodes of the column and the beam of the sub-structure of the embodiment.

FIG. 4 is a diagram illustrating the operation of the present invention.

FIG. 5 is a diagram illustrating the operation of the present invention.

FIG. 6 is a diagram illustrating the operation of the present invention.

FIG. 7 is an explanatory diagram of the operation and effect of the present invention.

FIG. 8 is a schematic configuration diagram of a conventional vibration damping structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main structure 10a Column 10b Beam 12A, 12B ... Sub-structure 13 Suspension material 14 Vibration control device 16 Column 17 Beam 18A Rigid structure 18B Roller support structure 23 Roller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 E04B 1/34

Claims (1)

(57) [Claims] 1. A substructure which defines a living room / living space in a space formed inside a main structure consisting of a main frame,
The upper part is suspended by a plurality of suspending members extending from the beams of the main structure, and the lower part is restrained from moving laterally by a vibration damping device interposed between the main structure and the lower part. A plurality of types of hanging members having different lengths are used as the plurality of hanging members for hanging the one sub-structure, and the sub-structure is vertically spaced from a plurality of columns.
A multi-layer structure comprising a plurality of beams arranged with
The upper ends of the columns of the sub-structure are connected to the beams of the main structure.
The hanging member is formed by the joint between the column and the beam of the sub-structure.
The points are a rigid structure where the two are joined together,
B to support the vertical load of the beam while allowing horizontal movement
And the suspension member is provided with two types,
A vibration damping structure characterized in that the specific length is determined .