A study on a hybrid system of cable-stayed prestressed concrete bridge and steel suspension bridge

The span of cable-stayed prestressed concrete bridges combined with steel girder has been longer than 800m such as Tatara Ohashi and Normandy Bridge. But it is not expected that it will be longer than 2000m because of structural and economical problems. On the other hand, there are many steel suspension bridges with long span more than 1000m, and furthermore, there are some projects to construct bridges with very long span at straits in Japan. In such projects, it is said that their spans are more than 2000m. In this paper, the authors propose a hybrid system of cable-stayed prestressed concrete bridge and steel suspension bridge, which enables us to construct bridges with longer span and is expected to have an economical advantage compared with ordinary steel suspension bridge.