Vine-copula-based structural multi-hazard reliability assessment under post-earthquake fire

Structural damage under multi-hazard conditions is much greater than that of a single hazard, and it is therefore urgent for researchers to consider the cascading effects between different hazards in the structural safety assessment.In this paper, a structural multi-hazard reliability analysis framework is proposed based on the vine copulas model.The framework is able to fully consider the nonlinear correlation between different hazards.A two-parameter failure criterion is used to reflect the failure mode of the structure under the combined effect of multiple hazards.A reinforced concrete (RC) structure is used as an illustrative example to validate the feasibility of the proposed approach.The structural failure probability p f and reliability index of structures under post-earthquake fire (PEF) scenario is investigated.The outcomes indicate that p f and exhibit increasing and decreasing trend as the increasing of intensities of earthquake and fire events.The developed framework can effectively characterizes nonlinear inter-dependencies among multi-hazard scenario, and provide a more accurate prediction of multi-hazard reliability of structures