The west main bridge of Yangzizhou Ganjiang River Rail-cum-Road Bridge of Nanchang-Jiujiang High-speed Railway is a long-span cable-stayed bridge with a main span of 320 m.As a double-decker,the bridge allows for a train travelling speed of 350 km/h,where the lower deck accommodates two ballastless high-speed railway tracks(arranged in the center of the deck)and four lanes of urban trunk roads(two on each side of the railway track and for the same direction),and the upper deck carries 8 freeway lanes.To address the construction conditions at the bridge site,two options were presented,one was a cable-stayed bridge that was arranged in a main span of 320 m,two side spans of 128 m and two end spans of 64 m and had a composite superstructure consisting of steel trusses and steel-box-girder decks,and the other was a steel truss arch bridge.The comparison indicated that the cable-stayed bridge with steel truss and box composite superstructure is superior to the steel truss arch bridge in terms of load bearing performance,construction stability and economy,which was finally selected.Three types of stay cable arrangements,including the double fan planes of dense stay cables,double fan planes of sparse stay cables and double harp planes of dense stay cables,were compared from aspects of structural load bearing performance,ease-of-construction,economy and landscaping effect.The double harp planes of dense stay cables was determined as the final scheme.The pylons are vase-shaped structures,the superstructure consists of the central trusses with outriggers and two levels of steel-box-girder decks.All the load bearing performance,stability and stiffness of the bridge structure reach the expected levels.
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