Abstract
Concrete filled steel tubular arch (CFST) bridges have been widely used in China since the 1990s. However, researches on the stability design of this type of bridges are limited, especially for the out-plane stability. Therefore, a numerical inverse finite element reliability method is presented to solve the problem. In this method, safety factors are introduced into the limit state equations. The cooperation of programming and general finite element software is utilized to implement the method. For different target reliability indices, out-plane stability safety factors of CFST arches considering nonlinearities are obtained via the method. The results show that: the method is of good efficiency and applicability; steel ratios and lateral loads have significant influences on the safety factors; the effects of resistance and load uncertainties on the factors are important which should be concerned in stability design of CFST arch bridges.
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