Based on the measured data of pedestrian up and down stairs biodynamic model

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (4) : 233-239.

ZHU Qiankun1,2,CHEN Kai1,DU Yongfeng1,Li Hongnan1,LIU Lulu3

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Abstract

In order to study the dynamic response of long-span flexible stair under human-induced excitation when considering the interaction of human-stair structure, so a single degree of freedom dynamic response mathematical model was defined, and obtained the acceleration frequency response function. human-stair interaction system was defined based on pedestrian on stair. Biomechanical model up and down stair were built by testing data. The model is equivalent to the three element nonlinear equations with parameters and massive vertical acceleration of pedestrian walking on stair were obtained. FFT was used to get the input parameters, the output parameters mass, stiffness, damping, were obtained by solving the equivalent equation set by least square method. The distribution of the three parameters were analyzed. The formula of the three parameters were built by the quadratic surface fitting. Finally, the pedestrian up and down stairs biodynamic model was built.

Key words

flexible stair / human-structure interaction / quadratic surface fitting / biomechanical model

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ZHU Qiankun1,2,CHEN Kai1,DU Yongfeng1,Li Hongnan1,LIU Lulu3. Based on the measured data of pedestrian up and down stairs biodynamic model[J]. Journal of Vibration and Shock, 2018, 37(4): 233-239

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