市域(郊)铁路110 m单肋双索面简支拱桥设计  

Design of 110 m Single Ribbed Double Cable Plane Simply Supported Arch Bridge in Urban(Suburban)Railway

作　　者：杨欣然 李伟超 施威 Yang Xinran;Li Weichao;Shi Wei(Civil Engineering Design Research Institute,China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司土建工程设计研究院,天津300308

出　　处：《铁道技术标准（中英文）》2024年第9期1-7,共7页Railway Technical Standard(Chinese & English)

基　　金：中国铁路设计集团有限公司科技开发课题(2023BTJ20)。

摘　　要：简支拱是将预应力混凝土梁和钢管混凝土拱肋结合在一起的结构体系,在受力上集合了两者的优点,应用时以双拱肋形式为主。单拱肋简支拱与常用的双拱肋简支拱在受力模式上有所不同,为铁路桥首次应用,设计难度较大。通过计算分析,主梁采用刚性系梁,拱肋采用桁架式,增大了结构的刚度及承载能力。通过采用横向双吊杆、选取合理拱肋截面等构造措施,解决了单拱肋钢管混凝土拱的横向稳定性问题。单肋拱简支拱吊点横梁与双肋拱吊点横梁受力模式不同,设计时需注意横梁预应力的合理布置。The simply supported arch is a structural system that combines the prestressed concrete beam and the concrete-filled steel tube arch rib.It combines the advantages of the two in terms of force,and is mostly used in the form of double arch ribs.The simply supported arch with single arch rib is different from the commonly used simply supported arch with double arch rib in the stress mode.It is the first application of railway bridge,and the design is difficult.Through calculation and analysis,the main beam adopts rigid tie beam and the arch rib adopts truss type,which increases the stiffness and bearing capacity of the structure.By adopting horizontal double suspension rods and selecting reasonable arch rib sections,the lateral stability problem of single arch rib steel tube concrete arches has been solved.The stress modes of the single-rib arch simply supported arch suspension point beam and the double-rib arch suspension point beam are different,and the reasonable arrangement of the beam prestress should be paid attention to in the design.

关 键 词：市域(郊)铁路 单肋拱 双索面 结构设计 横向计算 抗震设计 

分 类 号：U443[建筑科学—桥梁与隧道工程]