木造床の鉛直振動特性に及ぼす人間荷重の影響に関する実験的研究 (第1報)

概要

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Impact hammer tests were conducted to demonstrate the effect of human load on vertical vibrational characteristics (first natural frequency and damping factor) of wooden floors. The specimen was a 6.5m-long-span and 1.0m-wide wooden floor consisted of two 120mm wide and 300mm deep laminated wood timbers and 21mm-thick plywood sub-floor. The support and live load conditions of the specimen were changed. The live load combined with human load and furniture load ranged from 0 to 60 kg/m^2 respectively were applied to the wooden floor. The test results indicate, I) Human load hardly affects the first natural frequency of the wooden floor, ii) The value of damping factor at first natural frequency increases in proportion to the rate of human load over the weight of a wooden floor, iii) The measured first natural frequencies of the wooden floors coincide with those calculated according to the vibration theory for bending continuous model with the bending stiffness and the weight (the sum of dead load and furniture load except the human load) of the wooden floor.
社団法人日本建築学会の論文
2004-11-30