Research on the Comfort and Damping of Pedestrian-induced Vibration of a W-shaped Pedestrian Bridge
In order to solve the man-bridge resonance problem of a W-type pedestrian bridge under extreme crowd load,taking a practical project in southwest China as an example,the dynamic comfort analysis under extreme crowd load was carried out based on numerical simulation method,and the vibration reduction scheme was studied.The results show that when the vertical first-order natural vibration frequency of the pedestrian bridge is 3.04 Hz,the W-shaped pedestrian bridge has hidden trouble of human-bridge resonance.According to the calculation,the peak acceleration of the main beam is 0.96 m/s2 under the five crowd loading conditions of 0.2,0.5,1.0,1.5 and 4.6 P/m2,and the comfort index is medium,which does not reach the optimal comfort level.After a tuned mass damper(TMD)with a mass ratio of 1%was set at the position with the maximum amplitude,the peak acceleration of the main beam was reduced to 0.10 m/s2,and the vibration reduction rate was 89.6%.The pedestrian bridge satisfied the optimal comfort level.The research results can provide technical reference for evaluation of human induced vibration comfort and vibration reduction design of similar special-shaped pedestrian bridges.
NETL
NSTL
万方数据
维普
