Multi-scale reliability analysis of FRP truss bridges with hybrid random and interval uncertainties

Due to the multi-scale characteristics of composites and the lack of statistical data, the reliability assessment of FRP truss bridge faces more complex problems such as multi-source uncertainties and multi-scale uncertainties compared with traditional bridges. In this paper, a hybrid multi-scale reliability analysis method which couples the multi-scale computational homogenization method with reliability analysis method of hybrid random and interval uncertainties, is proposed to accurately quantify the reliability of FRP truss bridges with considerations hybrid probability and interval uncertainties at micro and macro scales. The effectiveness and efficiency of the method are compared with the Monte Carlo simulation method through a theoretical example. The comparison with the other three interval variable processing methods demonstrates that the proposed method can effectively evaluate the reliability of FRP truss bridge in a multi-source and multi-scale approach.