Field measurement and theoretical comparisons of a long-span suspension bridge’s wind-induced vibration responses
HU Jun1，2, OU Jinping3
1, State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074;2, School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing 400074, China;3,School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Abstract：Based on the structural health monitoring system installed on a long-span suspension bridge, the simultaneous wind speeds at bridge deck and wind-induced acceleration responses of stiffening girder and hangers were recorded. The actual characteristics of wind-induced vibrations and the comparisons of the theoretical results with the measured responses were discussed. The results indicate that the RMS of acceleration responses of stiffening girder have a linear relationship with the average wind speeds vertical to the bridge deck, and the dynamic characteristics are stable with the wind speed increases; the dynamic response of hanger under wind is a high frequency resonance vibration and the resonance frequency increases with the wind speed increases; the buffeting responses of theoretical analysis are significantly greater than the measured values, the buffeting analysis still need more refinement.
2013, Vol. 32 
