TIME-DEPENDENT RELIABILITY ANALYSIS OF STEEL-CONCRETE COMPOSITE BEAM BRIDGE CONSIDERING ENVIRONMENTAL IMPACT

摘要

Based on the research results of low carbon steel corrosion under atmospheric environment, the corrosion model of members of steel-concrete composite beam bridges has been build and the moment resistance time-dependent model has been constructed duo to steel corrosion and concrete strength evolution. A computer procedure for time-dependent reliability analysis of steel-concrete composite beam based on JC method and Matlab program has been also developed. A steel-concrete composite beam bridge was taken as an example. The results show that the ultimate limit state reliability of steel-concrete composite beam bridge due to load and resistance' development with time reduced continuously in service life. Compared with smaller influence of environment corrosion on the moment resistance and reliability of steel-concrete composite beam bridges in rural and urban atmospheric environment, the influence of industrial and marine atmospheric environment on the moment resistance and reliability was greater and must be considered.