Safety Factors Assessment for Out-plane Stability of CFST Arches Using Inverse Reliability Method

摘要

Concrete filled steel tubular arch(CFST) bridges have been widely built worldwide in the past two decades.However, studies on the stability design of this type of bridges are limited, especially for the out-plane stability.Therefore, a numerical inverse reliability method is presented to solve the out-plane stability safety factors of CFST arches.The cooperation of programming and general finite element software is utilized to implement the method.In this method, a safety factor is introduced into the limit state equation for the out-plane stability of CFST arches.For different target reliability indices, out-plane stability safety factors with and without considering nonlinearities are obtained based on arch models.The results show that: the method is of good efficiency and applicability; steel ratios and lateral loads have significant influences on out-plane stability safety factors; the effects of resistance and load uncertainties on the out-plane stability factors are clear which should be concerned in design.