Abstract
Concrete filled steel tubular (CFST) arches have been widely used in bridge structures for the advantages of material properties and construction technologies. However, studies for out-plane stability with the consideration of uncertainties due to the concrete creep have been limited. In this paper, the limit state function (LSF) for out-plane creep stability of CFST arches is established. The stastical information of creep coefficient of concrete is obtained based on the Monte Carlo Simulation (MCS) method. Based on the models of out-plane creep stability, the time-dependent reliability method and the finite element reliability method (FERM) are combined to investigate the reliability deteriotion for the out-plane stability of CFST arch ribs. The results show that the reliability indices for out-plane creep stability decreases sharply with time; the deteriotion of time-dependent reliability is significant in the first 200 days; the effects of steel ratios on the time-dependent reliability index is remarkble.
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