高速铁路四线80 m钢管混凝土系杆拱桥设计

Design of an 80 m Steel Tube Concrete Tied-Arch Bridge for High-Speed Railway with Four Tracks

安九铁路为速度350 km/h高速无砟铁路,横向布置四线,桥址位于孔垄北站且跨越梅济港。为尽量控制线路纵断面,减小结构高度,经方案比选,主跨采用80 m简支系杆拱桥,拱肋采用钢管混凝土哑铃形截面,为目前国内首座高速铁路四线钢管混凝土系杆拱桥。通过结构参数比选,确定合理结构尺寸,并建立空间杆系和实体有限元模型,对结构自振特性、空间稳定性进行数值计算,同时对全桥进行车桥耦合仿真分析。结果表明,该桥设计合理,各项计算结果满足规范要求,且具有良好的动力性能。

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.