ABSTRACT
The article will give a summary analysis about the problems of durability of large span concrete bridges and steel bridges and hybrid bridges. Specially base on the technology practice on improving the durability of large span concrete bridges and steel bridges and hybrid bridges in Hubei province, introduce the technical methods on improving the durability of large span bridges. Such as the optimization of steel box structure and hybrid structure, the prefabrication assembly technology of concrete box, the technology of preventing and reducing cracks of concrete,and some new materials and construction technology etc.
