Design of Cable-Stayed Bridge of Caofeidian Industry Zone Bridge No.1

The Caofeidian Industry Zone Bridge No.1 is composed of navigable span bridge,non-navigable span bridges and approach bridges and is located in the cold and strong earthquake region in the northern part of China.A summarized account of the design of the navigable span bridge of the bridge is presented herewith.In accordance with the construction conditions and landscape requirements,the navigable span bridge is designed as a single pylon and single cable plane cable-stayed bridge with span arrangement 2×138 m,the pylon is the column pylon in shape of boat sail.The anchorage zone in the pylon is the steel anchor box exposed outside the pylon.The main girder is the steel and concrete composite girder having three cells and a single box.The stay cables are made up of 7 mm galvanized parallel steel wires and the foundation of the pylon pier is the group pile foundation.The research of seismic resistance of the bridge show that for a major single pylon cable-stayed bridge located in the strong earthquake region,the rigid fixity system of pylon,girder and pier should be possibly avoided in order to reduce seismic response of the bridge structure.