In Service Rc Liangqiao Cheng Set Out To Reliability Analysis

Reliability assessment of the used bridge is an urgent problem to be resolved presently in engineering field. The resisting force of structure is deteriorating in service period, yet it doesn't be considered in most reliability assessment so far. In this paper, based on deteriorating resisting force model and load model, the ultimate state equations of RC bridge were established; the code to calculate the time-dependent coefficient of reliability were composed as well.Consulting data of former studies as conferences, based on the concrete carbonization mechanism and the steel bar corrosion mechanism, this paper analyzed the carbonization depth model and stochastic model for predicting the corrosion depth of steel bar before and after concrete cover cracked. The deteriorating of resistance force model for direct section capacity and shear strength of RC beam was established by Considering each single factors(concrete carbonation,steel bar corrosion,materials strength) relating to the resistance forces of reinforced concrete beam. And then, Adopting dead load model (Gaussian distribution) and vehicle load model (non-gaussian distribution), which based on general traffic or rush hour traffic, the max value of distribution functions of load modes in service period were presented.Based on deteriorating resisting force model and load model, reliability theory being used in assessment of resisting force of bridge structure, the ultimate state equations of bridge were established. The code to calculate the time-dependent coefficient of reliability of bridge structure were composed by JC method, which be proved practicable by an engineering example at the end of this paper.