System Reliability Analysis of Half-through Concrete-filled Steel Tubular Arch Bridge Based on Optimization Technique

The object of this paper analyzes the reliability of half-through concrete-filled steel tubular arch bridges. Load and resistance parameters are treated as random variables. The statistical parameters are based on the available literature, test data and survey results. Reliability indices of main components of the bridge structure are calculated by iterations using the first-order second-moment method. The half-through concrete-filled steel tubular arch bridge is the typical series system and the reliability index of the system is calculated by the optimization technique. The study shows that the optimization technique has a good application to example bridge which meet the requirement of ductile index.