西拉沐伦河特大桥主梁结构整体计算及局部仿真分析

Structure Calculation and Partial Simulation Analysis on Xilamulun River Super Large Bridge

矮塔斜拉桥是介于连续梁桥和斜拉桥之间的新桥型,为了更好地了解其受力性能、优化结构设计,本文以西拉沐伦河特大桥为背景,通过有限元软件MIDAS Civil建立全桥模型,对主梁施工及运营阶段进行全桥应力和承载能力验算;并通过大型有限元分析程序ANSYS,对主梁受力复杂且局部应力集中现象明显的斜拉索横梁梁段及斜拉索齿块进行局部应力仿真分析,以获得相关结论并为同类桥型设计提供参考依据及优化建议。

The extradosed cable-stayed bridge is a new kind of bridge type between the continuous beam bridge and the cable-stayed bridge.Aiming at this new structure,in order to better understand its mechanical characteristics and optimize the structural design,based on Xilamulun River Super Large Bridge,by using the finite element software MIDAS,a complete bridge model was established to verify the internal stress and the bearing capacity of the bridge under both construction and operation phases.Meanwhile,at locations with great stress complexity and concentration phenomenon,such as the transverse beam section and the gear block of the stay cable,by using powerful finite element program ANSYS,local stress simulation analysis was carried out to obtain relevant results and provide reference and suggestions for similar bridge design or optimization.