Experimental study on modal parameters of pedestrian bridge with static crowd-structure interaction

Abstract

Abstract: In this paper, the effect of modal parameters of pedestrian bridge under static crowd-structure interaction is studied, and the steel structure pedestrian glass bridge is used as the research platform. The research contents are as follows: the dynamic parameter of the pedestrian bridge under the excitation of the test environment and the dynamic parameters of the structure under different positions are changed under the action of the static crowd in different positions of the pedestrian bridge. The results show that under the static population-structure interaction, with the increase of the number of people acting, the natural frequency of the structure decreases and the damping ratio increases gradually. The sitting posture has the greatest influence on the structural frequency, the natural vibration frequency of the structure decreases from 4.381Hz to 3.643Hz, which is decreased by 16.8% under the action of four people, and the semi-squatting position has the greatest effect on the damping ratio. The damping ratio of the structure increases from 0.660% to 4.888%, which is increased by 640.6% under the action of four people. When the static population is located at the peak point of a certain order mode, the frequency of the corresponding modal structure is the smallest and the damping ratio is the largest.

Key words: steel structure glass footbridge, static crowd-structure interaction, modal parameters

CLC Number:

TU391

MA Fa-rong, ZHU Qian-kun, ZHANG Qiong, DU Yong-feng. Experimental study on modal parameters of pedestrian bridge with static crowd-structure interaction[J]. Journal of Lanzhou University of Technology, 2022, 48(2): 115-122.

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