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Design of Main Bridge of Yunfei Bridge in Jinzhou City
Pages: 15-19
Year: Issue:  4
Journal: World Bridges

Keyword:  cable-stayed bridgeedge beamtwo-sets of archPPWS stay cableseparated foundationstructural designrotating construction;
Abstract: The main bridge of Yunfei Bridge in Jinzhou City is a single pylon cable-stayed bridge with double cable-planes and with span arrangement of 108+92m.The bridge is designed as a combined continuous girder and cable-stayed bridge,with separated pylon and girder.The main girder adopts the double-edged steel box beam structure with a height of 2.8m.The standard bridge deck width is 30 m,with two-way 2%transverse slopes.The pylon is formed of two sets of arches:an outer arch and an inner arch,the outer arch is 65.5mhigh and inclines 8°,the roots of which are spaced at a distance of 38.0m.The inner arch is 54.2mhigh and inclines 15°,the roots of which is spaced at a distance of 25.0m.Between the outer and inner arches,25 tensile connecting struts and 2compressive struts were installed.The stay cables are the finished PPWS cables and the cross section of the arch rib adopts box section.At the pylon roots,the 100 mm diameter anchor bolts are used to anchor the pylon legs to the top of the pier cap,and the threaded reinforced bars are added to supply prestress.A total of 20 pairs of stay cables which are made up of high strength galvanized parallel wires,are tensioned between the pylon and the girder.The foundation of the arch pylon is formed of four separated group pile foundations with pile diameter of 1.5m。The pylon is constructed by the scheme of being assembled horizontally and vertically rotated.The construction method of using the inner arch to lever the outer arch is innovatively employed.
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