Damage Detection of Long Cable-supported Bridges Based on Stress Influence Line
Numerous long-span cable-supported bridges have been built throughout the world in recent years.These bridges begin to deteriorate once built and continuously accumulate damage during their long service life.The failure of local structural components is detrimental to the performance of the entire bridge, but de tecting the local abnormality at an early stage is still difficult.This paper explores a novel damage detection technique based on stress influence lines (SILs) of bridge components, and validates the efficacy of the technique through a case study of the Tsing Ma Suspension Bridge.Damage indices based on SILs are pro posed and applied to hypothetical damage scenarios, in which one or two typical local components are dam aged.Damage-induced SIL changes in various bridge components are compared to evaluate their sensitivity to the surrounding structural damages.The effectiveness of two damage indices-the SIL change and its cor responding first-order difference are evaluated in the single-damage cases with consideration of appropriate measurement errors in stress time history.The comparison suggests that the first-order difference of SIL change is an accurate indicator of the damage location.Results of this study indicate that the proposed SIL based method offers a promising technique for damage location detection in long-span cable-supported bridges.
Zhiwei Chen Qinlin Cai Songye Zhu
Department of Civil Engineering, Xiamen University, Xiamen, China Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, K
国际会议
哈尔滨
英文
652-659
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）