Durability Research And Life Prediction Of In Service RC Bridge Base On Reliability Theory

Now, we increasingly know reinforced concrete bridge which exists serious enduring problem because of the characteristics of the concrete material and environment. Date of domestic and international show that the economic loss caused of the harms of enduring disease of the bridge structure is very huge, and along with variety of environment, growth of service time , raise of function request, The durability problem of in service RC bridge is more and more outstanding.Through the research in durability of in service RC bridge, can carry on the assess of durability and prediction of life span, can be helpful to the choice of maintain project, on the other hand can be convenience to the governor building up a manage information database, making decision,and realize the funds exploitation maximizes.Therefore, the research of the bridge durablity is meaningful for the academic and practice in bridge field . this paper makes a summary of the predecessors' research product, explores the research on durability of RC bridge, the actual work done is as follows:1. This paper discoursed that of the research progress, significance, major content and general methods of concrete bridge durability studies is presented in this paper,. The status in quest of the durability research of concrete bridge is presented in three levels of material, element, and structure.2. Analyzed the basic theory, merit and demerit of the several existing methods of the durability evaluation of concrete bridge, and probe into its connotation and developing direction about the durability evaluation of concrete bridge.3. Introduced computational methods and theories for reliability of engineering structures ,then the practical and simplify compute method. Take deterioration of bridge durability into account , puting forward the concept of time-dependent realiability.4. Reliability theories, combined with the early model built through the mechanism research of factor which impact concrete durability factor ,build up the in service RC bridge durability evaluation method, the method can consider each variation which change quantity to assess result of influence, so have strong adaptability, draw lessons from building norm's assess standard then get the the durable assess of in service bridge s, and making use of relationship between the time variable function in the mechanism model with durability to predict it's remnants life.5. According to the comparing the calculate result of actual test date of in service bridge by the the methods of realiability, it evaluates the durability and remnant life of the bridge, According to Comparing the outcome and actuality, the result is believable, so it is utility.