Regarding the pedestrian-induced vibration issues of flexible foot suspension bridges, although there are many literatures have conducted vibration tests on pedestrian bridges, there is still relatively little research focusing on multiple and high-order order resonances. By conducting natural vibration tests and human-induced vibration tests on a suspension footbridge spanning the rooftop of buildings, the operation status and pedestrian comfort were evaluated, and the high-order resonance characteristics were studied combining the finite element analysis under the spring mass damping (SMD) model of the pedestrian. The results show that when pedestrians cross bridges with different resonant step frequencies, there is a great correlation between the acceleration time history and the shape of the resonant mode. The high-order resonant step frequencies and their half and double frequencies, and the step frequencies close to low-order modal frequencies can excite significant responses. The maximum acceleration is accompanied by an overall increasing trend in the number of people. The structural damping will increase when the acceleration is high, and considering its impact, the bridge is in a comfortable state for pedestrians within the pedestrian densities ranging from 0.2 to 1.5 persons per square meter. The conclusions of this study provide a theoretical foundation for elucidating the mechanism of high-order pedestrian-induced resonance in flexible pedestrian bridges.
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