American Society of Civil Engineers


Energy Damage Detection Strategy Based on Strain Responses for Long-Span Bridge Structures


by Zhao-Dong Xu, (corresponding author), (RC&PC Key Laboratory of Education Ministry, Southeast Univ., Nanjing, China; and International Institute for Urban Systems Engineering, Southeast University, Nanjing, China E-mail: zhdxu@163.com), Mi Liu, (RC&PC Key Laboratory of Education Ministry, Southeast Univ., Nanjing, China; and International Institute for Urban Systems Engineering, Southeast Univ., Nanjing, China.), Zhishen Wu, (RC&PC Key Laboratory of Education Ministry, Southeast Univ., Nanjing, China; and International Institute for Urban Systems Engineering, Southeast Univ., Nanjing, China.), and Xin Zeng, (RC&PC Key Laboratory of Education Ministry, Southeast Univ., Nanjing, China; and International Institute for Urban Systems Engineering, Southeast Univ., Nanjing, China.)

Journal of Bridge Engineering, Vol. 16, No. 5, September/October 2011, pp. 644-652, (doi:  http://dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000195)

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Document type: Journal Paper
Abstract: An energy damage detection strategy through disposing strain responses has been developed. First, the strain-based energy dynamic indexes for a system with multiple degrees of freedom were derived from the frequency response function (FRF) of strain responses and energy spectra density. Then, the traditional mode-shape curvature strategy and the proposed strain-based energy damage detection strategy were both used to analyze a long-span cable-stayed bridge, and it was found through comparison that the proposed strain-based energy damage detection strategy solved the shortcomings of the traditional mode-shape curvature strategy. Finally, damage location, damage quantification, and noise pollution resistance analysis for a long-span cable-stayed bridge with different degrees of damage were carried out to verify the effectiveness of the proposed strain-based energy damage detection strategy. The numerical analysis showed that the proposed strain-based energy damage detection strategy can locate damage positions accurately, and it also has good damage quantification and noise pollution resistance abilities.


ASCE Subject Headings:
Damage
Strain
Span bridges
Energy

Author Keywords:
Damage detection
Strain response
Energy curvature difference