Abstract：Research purposes: The (120 + 120) m double track extradosed bridge is used to cross over Qingdao-Jinan passenger dedicated line and Dazheng road in a grand bridge of Handan-Jinan railway to Qingdao-Jinan railway connecting line project. The cable-stayed bridge is located on a small radius curve with R=800 m. This bridge adopts swivel construction method, whose swivel tonnage reaches 25 000 tons. In design process, the spatial beam element model, spatial beam lattice model and spatial solid element model are used for structural FEA analysis. The complex spatial stress condition is deeply analyzed, and reasonable structural measures are adopted to ensure the structural safety. Research conclusions: (1) Calculation results reliability of the main girder can be guaranteed by using spatial beam element for FEA analysis and considering the influence of curve and multiple webs uneven stress via spatial beam lattice model. (2) Measures such as setting upper beam in the tower, setting stay cable transverse eccentricity in the tower and setting vertical prestressed tendon at the lower part of the tower are adopted to effectively solve the problem of tower transverse stress condition under stay cable radial force. (3) This bridge adopts the sixth generation cable saddle, which realizes two-way anti-sliding through one-sided bidirectional frictional anchorage device, whose frictional force is much clearer and more convenient for construction. (4) 1.4 m and 1.0 m eccentricities to the inner side of the curve are respectively set for spherical hinge and rotary table, ensuring the structural balance during rotation and improving the stress condition of foundation. (5) The research results have reference significance for similar bridges design in the future.
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2022, Vol. 39 
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