小曲线大跨度斜拉T构转体桥横向稳定性研究

Study on Transverse Stability of Small Curve and Long Span Cable-Stayed T-Shaped Rigid Frame Swivel Bridge

基于某高速铁路工程100m+100m预应力混凝土斜拉加劲T形刚构,运用Midas Civil有限元分析软件进行设计思路探索和施工过程分析,力求在设计阶段消除结构横向不平衡弯矩带来的技术风险。通过分析计算两种不同的偏心消除方案,研究得出小曲线大跨度转体桥梁适用的消除方案;通过分析计算3种不同的预偏心设计方案,研究得出大跨度小曲线半径转体桥梁适用的预偏心设计思路;最后通过施工阶段分析,分析论证了不同施工阶段转体桥梁的受力特点,说明了结构倾覆稳定的计算方法,阐述了不同施工阶段结构横向倾覆稳定的变化趋势。

Based on a high-speed railway project 100m+100m prestressed concrete cable-stayed stiffened T-shaped rigid frame,Midas Civil finite element analysis software is used to explore the design ideas and analyze the construction process,and strive to eliminate the technical risk caused by the lateral unbalanced bending moment of the structure in the design stage.In this paper,by analyzing and calculating two different eliminating schemes of eccentricity,the suitable eliminating schemes of small curve and long span swivel bridge is been obtained.By analyzing and calculating three different pre-eccentricity design schemes,the suitable pre-eccentricity design ideas of small curve and large span swivel bridge is been obtained.Through the analysis of the construction stage,the stress characteristics of the swivel bridge in different construction stages are analyzed and demonstrated,the calculation method of the overturning stability of the structure is explained,and the change trend of the lateral overturning stability of the structure in different construction stages is described.