A probability-based method for the assessment of walking-induced floor vibration was introduced.Existing methods of assessment fall into three categories,including simplified methods,frequency domain methods,and time domain methods.All these methods can calculate the maximum acceleration of the structural resonance caused by walking,but cannot consider the probability distribution of walking frequency,nor the exceeding probability of the acceleration.Pedestrian walking frequency mostly distributes within a narrow range and generally conforms to the normal distribution.The proposed evaluation method can calculate both the vibration acceleration and its probability density distribution,so the exceedance probability of the acceleration can be calculated which gives a more accurate assessment of the risk of structural vibration.A vibration acceleration response factor with a certain non-exceedance probability can be selected to represent the vibration performance of the structure.It is recommended that office buildings use a response factor with a non-exceedance rate of 95%,and pedestrian bridges use a response factor with a non-exceedance rate of 90%.
维普
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