基于MIDAS CIVIL的双塔双索面斜拉桥关键施工阶段受力性能分析  

Force Performance Analysis of Double-tower Double Cable-stay Cable-stayed Bridge Based on MIDAS CIVIL in Key Construction Stage

作　　者：李悦[1,2] 吴国雄 谢远勇 LI Yue;WU Guoxiong;XIE Yuanyong(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China;Chongqing Jianzhu College,Chongqing 400072,China;Chongqing Municipal Research Institute of Design,Chongqing 400020,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]交通运输部公路科学研究所,北京100088 [3]重庆建筑工程职业学院,重庆400072 [4]重庆市市政设计研究院,重庆400020

出　　处：《公路工程》2020年第4期141-146,共6页Highway Engineering

基　　金：科技部国际交流合作项目(2016YFE0108200)。

摘　　要：依托某双塔双索面钢-混凝土组合梁斜拉桥,基于有限元软件MIDAS CIVIL,通过建立全桥有限元模型并对其索力进行优化,以弯曲应变能最小为计算原则,当将主塔和主梁的抗弯惯性矩减小10 000倍时,得到满足要求的合理成桥状态,然后利用正装迭代法对施工阶段的索力进行求解,通过7次迭代,得到了施工阶段的索力值,利用其计算得到的成桥状态索力与合理成桥状态索力进行对比可知两者变化规律相同,吻合度较高,最近误差仅为4.5%。选取边跨合龙阶段、最大悬臂阶段和成桥阶段作为关键施工步骤,重点研究了主塔和主梁的弯矩、轴力和位移在各个施工阶段的变化规律。This paper relies on a double-tower double-span steel-concrete composite girder cable-stayed bridge. Based on the finite element software MIDAS CIVIL, the full-bridge finite element model is established and the cable force is optimized. The bending strain energy is the minimum calculation principle. When the bending moment of inertia of the main tower and the main beam is reduced by 10 000 times, the reasonable bridging state that meets the requirements is obtained, and then the cable force of the construction phase is solved by the formal iteration method. Through 7 iterations, the construction phase is obtained. The force value, using the calculated bridge state cable force and the reasonable bridge state cable force, the difference between the two is the same, the degree of coincidence is high, and the recent error is only 4.5%. In this paper, the side-span phase, the maximum cantilever stage and the bridge-forming stage are selected as key construction steps, and the changes of bending moment, axial force and displacement of the main tower and main beam at various construction stages are mainly studied.

关 键 词：斜拉桥 桥梁施工 有限元仿真 合理成桥状态 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]