| At present, domestic and foreign regarding already has the reinforced concrete beam-bridge reliability research to be many, reliability analysis theory is also quite perfect, but after reinforced concrete beam-bridge strengthened reliability research and the material are few, there have not been reported the studies which calculate dynamic reliability of reinforced bridge. Therefore, it is very essential to the reinforced concrete beam-bridge strengthened reliability carries on the analysis computation.In this article, firstly, introduced the reliability analysis of reinforced concrete bridge, the status quo and existing problems. And the method based upon reliability theory is the emphasis. The basic principles of reliability theory and the basic calculation methods of reliability index:JC method and Monte Carlo method are detailed introduced.Secondly, in the aspect of resistance degradation, based on the studies of concrete durability by the predecessors, one resisting force model is established, and the calculation formulas of the resistance parameters are deduced. Based upon the model establishment of the resistance and the load effect, and the comprehending of the reliability theory, one program used to calculate the time-dependent index of the bending member is compiled by MATLAB language.At last, through the practical engineering examples, with compiled MATLAB procedure which calculate dynamic reliability index, calculated reinforced bridge dynamic reliability index. When analyzing, used JC method and Monte Carlo method to calculate, and checked mutually the calculation results. Meanwhile, analyzed the parameters'influence for reinforced bridge dynamic reliability index, which constant load coefficient variation, Live load coefficient variation and the thickness of the steel plate, obtained relevant variation discipline.
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