Conceptual Design of Self-Anchored Cable-Stayed Suspension Bridge

Presently,the cable-stayed suspension bridge still stays in the stage of conceptual design and all proposals made for the design of such type of the bridge are of ground anchored system.For the design of the Dalian Sea-Crossing Bridge to be built,a self-anchored cable-stayed suspension bridge with span arrangement(263+800+263) m is proposed.As it is designed,the Bridge is provided with double pylons and double cable planes,the pylons and the piers are rigidly fixed,the pylons and the main girder are separated and the girder is a hybrid one made up of concrete and steel.In the cable-stayed part,the girder is a concrete box one while in the suspension part,the girder is a steel box one.The Bridge concurrently has the advantages of the cable-stayed bridge and the self-anchored suspension bridge and the structure of the Bridge is novel,the mechanical behavior is rational,the wind-resistant performance is good and the construction cost is low.Meanwhile,the tentative construction schemes for the Bridge are proposed as well,that is,the cantilever construction of the cable-stayed part of the Bridge will be carried out first,the main cables will be anchored to the temporary ground anchorage and the main girder for the suspension part will be then lifted and installed.