轨道交通工程中变宽连续U形梁的设计研究  

Design Research of Width-variable Continuous U Beam in Rail Transit Engineering

作　　者：李晓峰 陈轶鹏 LI Xiaofeng;CHEN Yipeng(Nanjing Metro Construction Co.,Ltd.,Nanjing 210017,China;Beijing Urban Construction Design&Deveopment Group Co.,Ltd.,Beijing 100037,China)

机构地区：[1]南京地铁建设有限责任公司,南京210017 [2]北京城建设计发展集团股份有限公司,北京100037

出　　处：《现代交通技术》2024年第4期79-83,共5页Modern Transportation Technology

摘　　要：在某轨道交通工程中,跨越道路时采用(30+48+30)m双线变宽连续U形梁,主梁采用现浇施工。该桥线路的间距变化大、设计难度大,通过建立有限元模型,对比分析杆系模型和三维实体模型的计算结果,研究关键截面纵向应力、横向应力的分布情况,验证桥梁构造设计、预应力布置的合理性,并提出桥梁的设计要点。研究表明,该类U形梁不仅可用于标准双线宽度的连续结构,还可用于非道岔区的连续变宽结构,从而拓展了连续U形梁在轨道交通领域的应用范围、丰富了U形梁的结构体系。A(30+48+30)m double-line widened continuous U beam is used when crossing the road in a rail transit project,and the main beam is cast-in-place.The distance of tracks the bridge lines varies greatly,so the design is difficult.The research intends to compare and analyze the calculation results of the rod system model and the three-dimensional solid model by establishing the finite element model,and study the longitudinal stress and transverse stress distribution on key sections,and verify reasonableness of the structural construction design and prestressed arrangement.And design points of the kind of bridge are put forward.Through the analysis,it is proved that the continuous U beam can be applied not only to the continuous structure with standard width,but also to the continuous widened structure in the non-turnout area thus expanding the application scope of the continuous U beam in the field of rail transit,and enriching the U beam structural system.

关 键 词：变宽连续U形梁 有限元 设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]