Design of an 80 m Steel Tube Concrete Tied-Arch Bridge for High-Speed Railway with Four Tracks
The Anqing-Jiujiang High-speed Railway is a 350 km/h high-speed ballastless railway with four-track layout.The bridge site is located at Konglong North Station and over-crossing the Meiji Port.In order to optimize the longitudinal profile of the track and reduce the structural height,an 80 m simply-supported tied-arch bridge with steel pipe concrete dumbbell-shaped ribs is adopted as the main bridge after scheme comparison,making it the first high-speed railway four-track steel pipe concrete tied-arch bridge in China.By comparing structural parameters,reasonable structural dimensions are determined,and spatial truss systems and solid finite element models are established to conduct numerical calculations on structural dynamic characteristics and spatial stability,simultaneously performing vehicle-bridge coupling simulation analysis for the entire bridge.The results indicate the bridge design is optimal,all calculation results meet the specification requirements,and it possesses good dynamic performance.
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