Study On The Durability Design Of Reinforced Concrete Bridges

Reinforced concrete structure is one of the most widely used structure form in the world. For a long time, because of the impact of"emphasis on the strength but neglecting the durability"design idea, massive reinforced concrete structure appear premature aging phenomenon due to insufficient durability . The negative influence and economic loss causing by the disadvantages of reinforced concrete structure attract widespread attention by more and more researchers and engineering technicians.The durability problem of concrete bridges is a system problem of multi factors , multi variables, multi-level. How to scientifically evaluate the durability and make the service life prediction for concrete bridges provides the basis for designing the service life of newly-built concrete bridges. Nowadays, it has become an urgent task in the study of concrete bridges durability.Base on relevant study at home and abroad, this paper made some exploration on the durability design of concrete bridges and mainly carried out the following work:1. Base on further study of relevant literature at home and abroad and data, analyzed the influencing factors of concrete durability. It included: concrete carbonation, reinforcement corrosion, alkali-aggregate reaction, freeze-thaw damage and chloride penetration etc.2. This paper studied the durability design of concrete bridges .Meanwhile, based on an engineering example,it carried out the steps and some problems needing attention in the durability design of concrete bridges .3. It made the durable life prediction for planning building concrete bridges by the integration of random probability method and reliability method. Based on quosi- monte carlo method and JC method, it made the reliability prediction of durability for bridge components which replacement and maintenance was unsuitable.