摘要
针对常规大跨轨道交通连续结构与简支U梁连接段的不匹配问题,提出了一种集连续箱梁桥与U型梁于一体的新型连续U梁结构。该结构具有较大的跨越能力,且实现了与常规U梁的平顺连接,提升了轨道交通高架线路的景观效果。通过建立ANSYS三维实体有限元模型,对新型连续U梁截面的正应力与剪应力分布规律进行分析和讨论,并采用Midas梁单元模型对某新型连续U梁的纵向预应力钢束布置进行了研究。研究表明:新型连续U梁截面正应力分布满足平截面假定,可采用梁理论对其力学行为进行分析,且该类型梁具有较好的力学特性和景观效果,可广泛应用于轨道交通高架线路中。
Aiming at the mismatch problem of the continuous structure with the connecting segment of simple supported U- type girder in the conventional long- span rail transit,a new continuous U- type girder structure integrating continuous box girder bridge and U-type girder is put forward.This structure has the longer spanning capacity and realizes the smooth connection with the conventional U- type girder so as to improve the landscape effect of elevated line in rail transit Moreover,3- D ANSYS solid finite element model is established to analyze and discuss the distribution law of normal stress and shear stress of the new continuous U-type girder section.Furthermore,the MIDAS girder element model is used to study the longitudinal pre- stressed tendon arrangement of a new continuous U- type girder.The study result shows that the normal stress distribution of the new continuous U- type section meets the plan- section assumption.Its mechanical behavior can be analyzed by the girder theory.This kind of girder has the better mechanical behavior and landscape effect and can be widely applied in the elevated line of rail transit
出处
《城市道桥与防洪》
2017年第2期106-109,共4页
Urban Roads Bridges & Flood Control
关键词
轨道交通
连续U梁
结构设计
分布规律
rail transit
continuous U-type girder
structure design
distribution law
