JP3634142B2 - Control method for vibration displacement of buildings, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling vibration displacement of a building or the like as a whole.
[0002]
[Prior art]
Since facilities that manufacture semiconductors and the like perform fine processing and precise inspection, even if a small vibration occurs, the processing is hindered. For this reason, it is necessary to take measures to prevent vibrations from being used as vibration sources and devices that should not be vibrated. Here, as measures to prevent the building from vibrating, a damping mechanism such as an oil damper, a control device that detects the movement of the building with a sensor and controls this movement, a vibration isolator that combines laminated rubber and a damper, etc. are used. There is a case. As other measures, the frame itself is made rigid or the weight is applied to the excitation source. Specifically, from the viewpoint of increasing the rigidity of the frame and clarifying the economy, workability, and vibration characteristics, the structure of the floor / slab 81 and the shapes of the large beam 82 and the small beam 83 as shown in FIG.・ Establishes the standardization of layout.
[0003]
[Problems to be solved by the invention]
However, unifying the shape of large beams etc. makes the vibration characteristics in the vertical direction of the same type of structural member clear as shown in FIG. 5, but the natural frequency of a specific structural member as a whole of a building, etc. Exceeds the allowable vibration value. In this example, the natural frequency 81a of the floor / slab 81 is within the allowable vibration value P. However, the natural frequency 82a of the large beam 82 and the natural frequency 83a of the small beam 83 exceed the allowable vibration value P. Therefore, in order to keep the natural frequencies 81a, 82a, and 83a of all the structural members 81, 82, and 83 within the allowable vibration value P, the rigidity and weight of the entire building and the like are increased and the allowable vibration value is increased. There was a problem that had to be raised.
[0004]
Therefore, an object of the present invention is to prevent the natural frequencies of each structural member from concentrating on a specific frequency, so that the natural frequencies of all the structural members are within an allowable vibration value, This is to eliminate the need to increase the allowable vibration value by increasing the rigidity and weight.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the vibration displacement control method for buildings and the like according to the present invention can be achieved by changing the length or width of adjacent structural members of the same type and / or the interval between the structural members. The vibration displacement of the entire building or the like is controlled so that the natural frequency of the structural member of the same type is not concentrated on a specific frequency.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a method for controlling vibration displacement of a building or the like according to the present invention will be described with reference to the drawings.
[0007]
As shown in FIG. 1, large beams 21 and 22 are stretched horizontally on top of the columns 1 and 1. The horizontal beams 21 and 22 are slightly longer in the horizontal direction than the large beam 21 in the large beam 21. The vertical lengths of the beams 21 and 22 are the same in both cases. In addition, for the girder (not shown) provided in the horizontal direction in FIG. 1, one girder is longer in the lateral length than the other girder, and the shapes of both are not unified. It has become.
[0008]
A plurality of small beams 31, 32, 33, and 34 are provided between the large beams 21 and 22 in parallel with these large beams. The small beams 31, 32, 33, and 34 are respectively hung on large beams that are provided in the horizontal direction in FIG. The small beams 31, 32, 33, and 34 are configured in various sizes whose vertical and horizontal lengths are not unified. Therefore, the natural frequency of the small beam 31 is 80 hertz, the natural frequency of the small beam 32 is 30 hertz, the natural frequency of the small beam 33 is 25 hertz, and the natural frequency of the small beam 34 is 50 hertz. ing.
[0009]
A floor / slab 4 is provided on the upper part of the beam 31, 32, 33, 34. The floor / slab 4 has different thicknesses between the small beams 31, 32, 32, 33, 33, 34.
[0010]
As described above, in the present embodiment, the large beams 21, 22, the small beams 31, 32, 33, 34, and the floor / slab 4 have different shapes and thicknesses. Does not have. That is, as shown in FIG. 2, the peaks and valleys of the curve are almost flat, and the natural frequency 2a of the large beams 21, 22 and the natural frequency 3a of the small beams 31, 32, 33, 34, the floor / slab All the natural frequencies 4a of 4 are within the allowable vibration value P.
[0011]
It should be noted that the natural frequency of the small beams can be prevented from being concentrated on a specific frequency if the intervals between the small beams 31, 32, 33, and 34 are not equal intervals but irregular intervals. .
[0012]
Next, a second embodiment of the present invention will be described.
As shown in FIG. 3, large beams 61, 62, 63, 64 are stretched horizontally around the pillars 5. A plurality of small beams 71, 72, 73, 74 are provided between the large beams 61, 62 in parallel with the large beams. The small beams 71, 72, 73, and 74 are spanned over the large beams 63 and 64, respectively. A small beam 75 is provided between the large beams 63 and 64 in parallel with the large beam, and the small beam is stretched over the large beams 61 and 62.
[0013]
As described above, in the present embodiment, since the small beam 75 is provided between the large beams 63 and 64, the vibration becomes irregular as compared with the case where the small beam is not provided, and the small beams 71, 72, 73, The characteristic of the vibration characteristic 74 can be reduced.
[0014]
【The invention's effect】
As described above, according to the present invention, since the natural frequency of each structural member is not concentrated on a specific frequency, the natural frequencies of all the structural members are within the allowable vibration value. There is no need to increase the allowable vibration value by increasing the rigidity and weight of the building as a whole.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment.
FIG. 2 is a graph showing vibration characteristics in the vertical direction of each structural member in the first embodiment.
FIG. 3 is a transverse sectional view showing a second embodiment.
FIG. 4 is a longitudinal sectional view showing a conventional example.
FIG. 5 is a graph showing vertical vibration characteristics of each structural member in a conventional example.
[Explanation of symbols]
21, 22 Large beams (structural members)
2a Natural frequency of large beams (natural frequency of structural members)
31, 32, 33, 34 Beam (structural member)
3a Natural frequency of beam (natural frequency of structural members)
4 Floors and slabs (structural members)
4a Natural frequency of floor and slab (natural frequency of structural members)

Claims (1)

By changing the vertical or horizontal length of adjacent structural members of the same type and / or the interval between the structural members, the natural frequencies of the structural members of the same type are not concentrated on a specific frequency, A method for controlling vibration displacement of a building or the like, characterized by controlling vibration displacement of a building or the like as a whole.

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