大跨度高速铁路混凝土独塔斜拉桥设计  

Design of a Long-span Concrete Single-tower Cable-stayed Bridge for High-speed Railway

作　　者：段鈜 Duan Hong(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉

出　　处：《科学技术创新》2023年第13期168-171,共4页Scientific and Technological Innovation

基　　金：中铁第四勘察设计院集团有限公司研发项目(2020K010、2021K011、2021K016)。

摘　　要：新建昌九高速铁路跨赣江南支主桥采用(100+100+240+70)m混凝土独塔斜拉桥结构。主梁为单箱双室预应力混凝土结构;索塔中上塔柱采用H型设计,下塔柱采用双肢薄壁构造以减小阻水率,塔梁之间采用全固结体系;索塔锚固区采用混凝土齿块+环向预应力钢绞线体系;斜拉索采用平行钢丝拉索。通过多种有限元计算程序,对主桥主梁应力与变形、工后徐变、桥塔受力、斜拉索受力及列车行驶性能进行了分析。结果表明,主桥具备结构力学性能优异,列车行驶舒适性优秀,工后徐变小,对无砟轨道适应性好等特点。该桥总体采用常规挂篮悬臂浇筑法并结合支架现浇法进行施工。The main bridge across Ganjiang south branch which belongs to the Nanchang-Jiujiang high-Speed railway adopts the scheme of(100+100+240+70)m concrete single-tower cable-stayed bridge structure.A single-box prestressed concrete structure with double chamber is applied to it's main beam.The middle and upper tower pylon adopts H-shaped design while the lower pylon adopts double-shaft thin-wall piers in order to reduce water blocking rate.A rigid fixity system is used between the beam and tower.The tower anchorage zone adopts concrete block with circumferential prestressing.Parallel steel wire is used in the cable system.By using several finite element program,the stress and deformation of the main beam,the creep after construction,the stress of the bridge tower,the stress of the stay cable and the seismic resitance and the driving performance of the train are analyzed.According to the result,this bridge has excellent structural mechanical performance,excellent train driving comfort,small post-construction creep,and good adaptability to ballastless track.The bridge is generally constructed by conventional hanging basket cantilever casting method combined with bracket cast-in-situ method.

关 键 词：独塔斜拉桥 高速铁路 桥梁设计 风-车-桥动力响应 工后徐变 

分 类 号：U213.14[交通运输工程—道路与铁道工程]