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

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