A NOVEL TIME-DOMAIN METHOD FOR CRACK DETECTION OF GIRDER BRIDGES
A two-stage time-domain method for crack detection of girder bridges is proposed. Based on displacement responses in time domain and combined with the regularization method and the hypothesis testing, a damage index is established to detect the locations of edge cracks in girder bridges. Using the analytical relationship of the strain energy release rate and the stress intensity factor in linear elastic fracture mechanics, a model of crack size in time domain is derived to detect the depths of the cracks. The feasibility of the proposed method is investigated through some simulations, in which an edge crack is simulated as a torsional spring. The simulated results show that the locations of multiple cracks may be detected precisely, and the sizes of the cracks may be detected in an acceptable accuracy range. That also indicates that the proposed method has better robustness against measuring noise.
Yong-Guang Liu Zhong-Xian Li
School of Civil Engineering, Tianjin University, Tianjin 300072, P.R. China
国际会议
长沙
英文
400-407
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）