Abstract:In this study, a comprehensive life-cycle disaster-resistant reliability analysis framework was proposed for concrete structures subjected to sequential multi-hazard actions. First, stochastic sequence models for typhoon and earthquake events were developed respectively based on the compound Poisson process, thereby addressing the challenge of determining when these hazards occur and their corresponding intensities during the structure’s service life. On this basis, the discrete random harmonic function method was employed to reconstruct the typhoon-earthquake action sequences experienced by the structure, while the load combination principle was introduced to achieve probabilistic combination analysis of the two hazard sequences. Furthermore, by incorporating a stochastic fatigue-damage constitutive model of concrete, the cumulative damage effect of sequential typhoon-earthquake hazards was quantitatively evaluated and the underlying mechanism of structural resistance degradation was elucidated. Finally, the probability density evolution method was employed to perform a full life-cycle reliability assessment of the structure under typhoon-earthquake sequences. The case study demonstrates that the structural performance deteriorates significantly under sequential hazards; even without exceeding the design-level intensity in any single event, cumulative damage induced by repeated hazard actions may also lead to substantial degradation of structural reliability.
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