NON-PROBABILISTIC STRUCTURAL RELIABILITY METHOD BASED ON FUZZY FAILURE CRITERION
The structural reliability assessment problem exhibiting both fuzzy and Info-gap(Information-gap) uncertainties is investigated.The failure of the structure is usually a fuzzy event in practical engineering.Considering the failure region and the safety region of the structure as fuzzy sets,the failure possibility measure and the safety possibility measure of the Info-gap model are developed based on the membership functions of the fuzzy failure region and safety region.Then a general hybrid fuzzy and non-probabilistic structural reliability model is proposed based on the failure possibility measure and the safety possibility measure of the Info-gap model.The calculation procedures of the reliability index are also studied.The new hybrid model can be degenerated into the conventional non-probabilistic reliability model with common failure region and safety region of the structure.