床構造の減衰性能に関する実験的研究

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This paper discusses, on the basis of test results, the changes brought about in the dynamic characteristics of floor structure and human sensitivity to vibration by differences in the damping effect of floor structure. For the study the following two tests were performed : (1) Forced vibration test of the composite beam test floor fitted with dynamic dampers. (2) Test of human subjects on vibration table to obtain the relationship between their sensitivity to vibration and the damping effect of floor structure. The table was oscillated with various combinations of natural frequencies with damping coefficients obtained from the floor when walked on. The above tests led to the following conclusions : (1) In addition to "resonance" and "delayed duration of impact vibration", lower damping coefficient of the floor structure causes "overlapping and amplification of vibration" when the vibration is made by periodic impact which is usually caused by someone walking. (2) The influences of floor structure' damping effect on the sensitivity to vibration by someone walking are as follows : a) Negligible in a low natural frequency range such as 5 Hz. b) In the range of 10〜20 Hz, a damping coefficient of approximately 5 % decreases the sensitivity approximately 1/1.5 times. (3) The dynamic damper improves the damping effect of floor structure, decreases resonance amplitude, decreases the duration of impact vibration, and surppresses the overlapping and amplification of vibration for the periodic impact such as walking. From these results, the dynamic damper is worth noting as an effective physical vibration control device for floor structures with large span.
社団法人日本建築学会の論文
1988-05-30

床構造の減衰性能に関する実験的研究

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