The Study On Durability Of Highway Concrete Bridge

Reviewing the development course of the bridge building in the developed countries, it has probably gone through 20-30 years since building on a large scale to the appearing of durability damage question of the bridge. The construction of highway concrete bridge in our country is lagged behind the western developed country in links such as raw materials choosing, structural design and construction technology, etc. Built bridges according to the present level of our country, we can infer that the durability damage of bridges faced in the future will be more serious than the problem which the western developed country faced today. So, it is very essential to launch the research of concrete bridge durability as soon as possible.This dissertation developed the research relied on the constructive science and technology item of the westward traffic: "Research on Damage and Safety Assessment Technology of Highway Concrete Bridges". Beyond the survey on durability technology of bridge building, the dissertation gathered the common diseases that the concrete bridge of highway existed at present. With analyzing the causes, the article discussed the influence to concrete bridge durability acted by the common diseases.The dissertation carried on the investigation and gathered in the common disease of concrete bridge. Then, it analyzed the cause of the disease which impacting on durability of the concrete bridge. Subsequently, the dissertation analyzed and made further research on injury function of concrete bridges' durability from the disintegrating of concrete bridge material (including reinforcing bar and concrete), external environment and human factors. Based on the theoretical research, the dissertation improves and puts forward the corresponding improvements measure in order to improve the durability of the concrete bridges.With comparing the achievements of research on reinforcing bar corrosion at present, the article considered both section losing and surrender intensity reducing caused by corrosion of reinforcing bar. At last, the dissertation adopts the procedure ANSYS of large-scale common finite element to analyze the mechanics behavior of the concrete bridge under the corrosion state of reinforcing bar, which to make further study on the durability of concrete bridge under the corrosion state of reinforcing bar.