阜淮高铁高低塔混合梁斜拉桥方案研究  

Research on Scheme of Mixed Beam Cable-stayed Bridge with Unequal Height Towers on Fuyang-Huaibei High-speed Railway

作　　者：张欣欣[1] 陈怀智[1] 王法武[1] ZHANG Xinxin;CHEN Huaizhi;WANG Fawu(China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《铁道标准设计》2022年第11期76-81,共6页Railway Standard Design

基　　金：中铁上海设计院集团有限公司科研计划课题(集21-B05)。

摘　　要：阜淮高铁跨越颍河节点受航道等级、通航孔布置及线路纵断面条件限制,主桥需采用主跨230 m、边跨114 m的不等跨低高度桥梁结构。为选择合理的桥梁方案,分别对高低塔斜拉桥、独塔斜拉桥、连续钢桁梁柔性拱桥3个方案,从桥梁结构选型、力学及变形指标、施工及工程投资等方面进行综合比选;并对高低塔斜拉桥钢混结合段位置进行了比选和参数分析。研究结果表明:推荐采用(31+73+230+114+40)m高低塔混合梁斜拉桥方案,能很好地满足主副通航孔设置和低梁高要求,具有较大的结构刚度,对无砟轨道适应性好,且经济性较优;针对不等边跨各自受力特征,推荐不对称设置结合段位置,230 m和114 m跨采用结合梁,其余采用混凝土梁,结构经济合理;结合段远离主塔或辅助墩,结合段内力减小,但主梁内力增大,结合段变形增大;通过分析合理选择结合段位置,使结合段和主梁受力合理、静活载响应小、施工便利。The Fuyang-Huaibei High-speed Railway crossing the Yinghe River is limited by class of waterway,arrangement of navigation channels,longitudinal section conditions of the line.The main bridge needs to adopt a low-height bridge structure with a main span of 230 m and a side span of 114 m.In order to select a reasonable bridge scheme,cable-stayed bridge with unequal height towers,cablestayed bridge with single tower and continuous steel truss flexible arch bridge are studied respectively.Comprehensive comparisons are conducted in aspects of bridge structure selection,mechanics and deformation index,construction and project cost.The locations of the steel-concrete composite segment of the cable-stayed bridge with unequal height towers are compared and analyzed.The results show that cable-stayed bridge with unequal height towers and spans of(31+73+230+114+40)m is recommended,which can satisfy the requirements of the channel dimensions and the low-height of the beam with large structural stiffness,good adaptability to ballastless track,and better economy.In view of the force characteristics of unequal side span,asymmetric position of the steel-concrete composite segment is recommended,and the composite beams are used for 230 m and 114 m spans,and the rest adopt theconcrete beam of economical and reasonable structure.When the distance between the steel-concrete composite segment and the tower or auxiliary pier increases,the internal force of the steel-concrete composite segment decreases,but the internal force of the main beam increases and the deformation of the steel-concrete composite segment increases.By reasonably selecting the position of the steel-concrete joint section,the forces of the composite segment and the main beam are more reasonable,the response of static live load is small,and the construction is convenient.

关 键 词：高速铁路 铁路桥 斜拉桥 高低塔 混合梁 结合段 方案研究 

分 类 号：U238[交通运输工程—道路与铁道工程] U448.27[建筑科学—桥梁与隧道工程]