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Reliability Assessment of Fatigue Crack Propagation using Response Surface Method  

Cho, Tae Jun (대진대학교 건설시스템공학과)
Kim, Lee Hyeon (한국철도기술연구원)
Kyung, Kab Soo (한국해양대학교 토목환경공학과)
Choi, Eun Soo (홍익대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.20, no.6, 2008 , pp. 723-730 More about this Journal
Abstract
Due to the higher ratio of live load to total loads of railway bridges, the accumulated damage by cyclic fatigue is significant. Moreover, it is highly possible that the initiated crack grows faster than that of highway bridges. Therefore, it is strongly needed to assess the safety for the accumulated damage analytically. The initiation and growth of fatigue-crack are related with the stress range, number of cycles, and the stiffness of the structural system. The stiffness of the structural system includes uncertainties of the planning, design, construction and maintenance, which varies as time goes. In this study, the authors developed the design and risk assessment techniques based on the reliability theories considering the uncertainties in load and resistance. For the probabilistic risk assessment of crack growth and the remaining life of the structures by the cyclic load of railway and subway bridges, response surface method (RSM) combined with first order second moment method were used. For composing limit state function, the stress range, stress intensity factor and the remaining life were selected as input important random variables to the RSM program. The probabilities of failure and the reliability indices of fatigue life for the considered specimen under cyclic loads were evaluated and discussed.
Keywords
railway bridge; fatigue life; crack growth; reliability; RSM;
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