Abstract
A fatigue reliability model based on the peridynamic (PD) theory was proposed to analyze the fatigue performance of steel bridges in this study. Different from previous methods based on classical continuum mechanics, the PD model does not require additional criteria to guide the growth of crack or damage. In particular, the influence of fatigue threshold value was considered in a systematic formula, and the response surface method was utilized to analyze fatigue failure probability. The proposed model was applied to complex fatigue phenomena such as spontaneous crack nucleation, crack branching, and fatigue failure under biaxial cyclic loadings where fatigue crack paths interact in complicated ways. The fatigue crack growth pattern, fatigue life, and fatigue reliability of specimens considering the biaxial or uniaxial fatigue loadings were analyzed. The accuracy of the fatigue model was verified through a series of comparisons with the experimental, analytical, and FEM results. The effectiveness of the proposed method was also demonstrated in the application to the fatigue reliability analysis of the Ting Kau Bridge.
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