人行荷载模型与人致结构振动试验研究

Experimental investigation on human walking load model and human-induced vibration of floor structure

为建立大跨楼盖结构人行荷载模型及人致振动分析方法,开展了楼盖模型结构人致振动试验研究.基于实测的动荷载因子值,建立了人行荷载傅里叶级数模型.依据结构动力学原理,建立大跨楼盖结构人致振动方程,采用Wilson-θ法及有限元分析计算大跨楼盖人致振动响应.基于7.7 m×4.7 m楼盖模型结构,开展了单人及多人不同行走频率工况下的人致结构振动试验,讨论了模型结构人致振动加速度响应的变化规律,并对比分析了理论计算与试验结果.结果表明,多人固定步频行走下的结构振动响应明显高于自由行走下的结果.不同工况下的模型结构人致振动试验结果与计算分析结果均较为吻合.建立的人行荷载模型及人致振动分析方法能有效预测人行荷载激励下大跨楼盖的振动响应.

To establish the human walking load model and the human-induced vibration analysis method of large span floors,experiments of human-induced vibration on the floor model structure were carried out. Based on the measured dynamic load factors,the Fourier series models of the human walking load were determined. According to the principles of structural dynamics,the human-induced vibration equation was deduced. The human-induced vibration response of large span floors was analyzed by the Wilson-θ method and the finite element method. Based on the composite floor model with 7. 7 m × 4.7 m,a series of tests on the structural dynamic responses of human-induced vibration produced by one or more persons with different walking frequencies were carried out. The change rule of the vibration acceleration response of the model structure was discussed. The theoretical calculation results and the experimental results were compared and analyzed. The results show that the structure vibration response of multiple persons walking with the fixed stride frequency is significantly higher than that of multiple persons with free walking. The human-induced vibration test results of the model structure under different working conditions are consistent with the calculation results. The proposed human walking load model and the human-induced vibration analysis method can effectively predict the structural vibration response of large span floors under the human walking load.