大跨PC组合结构在高速铁路无砟轨道桥梁中的应用研究

为了促进PC组合桥式结构在高铁桥梁中的应用,以西延高铁王家河特大桥为工程背景,分别对连续刚构加拱组合桥式、连续刚构部分斜拉桥、连续刚构加劲钢桁组合桥式在高速铁路无砟轨道大跨桥梁中的应用进行探讨,建立有限元模型进行分析,研究并总结各组合桥式方案的受力特点、设计难点、关键力学性能、结构设计等方面。研究结果表明,通过合理的结构设计,组合桥式结构能够充分发挥梁、索、拱结构的受力优势,进而满足高速铁路无砟轨道大跨桥梁对于梁端转角、徐变变形等控制条件的要求。

Application of Long-span Prestressed Concrete Composite Structure in High-Speed Railway Bridges with Ballastless Track

In order to promote the application of PC composite structure in high-speed railway large span bridges with ballastless track,the Wangjiahe super large bridge on Xi'an to Yan'an high-speed railway is taken as the project background to assess respectively the application of the continuous rigid frame structure with flexible arch,the continuous rigid frame with steel truss and the partial cable-stayed bridge.Important factors,such as stress characteristics,design difficulties,mechanical properties,structure design of different type structures,are studies with the finite element model. The results show that the composite structure could take adequately the advantages of the beam,arch and cable through reasonable design to meet the requirements of key indexes for high-speed railway bridges with ballastless track,in terms of rotation of beam end and creep deformation control.