水平振動の心理的反応に対する継続時間を考慮した評価方法の適用性に関する実験的検討

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タイトル別名
  • AN EXPERIMENTAL INVESTIGATION OF APPLICABILITY OF EVALUATION METHODS CONSIDERING DURATION FOR SUBJECTIVE RESPONSES TO HORIZONTAL VIBRATIONS
  • スイヘイ シンドウ ノ シンリテキ ハンノウ ニ タイスル ケイゾク ジカン オ コウリョ シタ ヒョウカ ホウホウ ノ テキヨウセイ ニ カンスル ジッケンテキ ケントウ

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 Building vibrations induced by external sources, such as road traffic or railway, can degrade the habitability, in particular, small-scale buildings, such as detached houses in Japan, because of their smaller mass and less from sources, compared to large buildings, such as apartment or office. Several studies have shown that the amplification of buildings is greater in the horizontal direction than in the vertical direction. The resonance frequency of building vibration mode with dominant horizontal vibration can be close to the resonance frequency of large vehicles caused by their suspensions. Although the vibration at the ground is at a magnitude below human perception threshold, a vibration problem could be caused by the vibration amplification due to resonance of the building. For this reason, when designing a building at a site with ground vibration at a concerned magnitude, it is necessary to design it for the performance against environmental vibration.<br> In this study, the ultimate goal is to develop evaluation methods for the habitability to building vibration by external vibration sources, such as road traffic and railway, based on subjective response to vibration, such as magnitude, discomfort and the like. The applicability of the current domestic and foreign evaluation methods of environmental vibration was investigated by evaluating subjective responses to horizontal vibrations measured in a laboratory experiment involving human subjects. The evaluation methods developed in the recent studies with vertical vibrations were examined also. Vibrations produced by actual vibration sources, such as road traffic, railway, construction work, and sinusoidal vibrations were used as input in the experiment.<br> The relationship between domestic and foreign evaluation methods of environmental vibration and subjective responses appeared to be most reasonable with Vibration Dose Value which considered the duration of vibration by the fourth power. It was found that the evaluation “LVmax + 20 log10(T1/4)” was reasonable evaluation method where “LVmax” is the maximum value of vibration level with the time constant of 630 ms and “T” is the duration of vibration level over 57 dB.

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