The variation of structural reliability with time is developed for a simple portal frame structure in the context of low-cycle fatigue under high level but short duration overloading occurring at random intervals during the design life of the structure. Inelastic fracture mechanics theory is employed for the analysis of low-cycle fatigue, and Monte Carlo simulation used for the reliability analysis. Some indicative results are given, limitations inherent in the present analysis are noted. (Author/TRRL)
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