轨索移梁新工艺力学特性分析与试验研究

Force Analysis and Model Test for New Rail Cable Launching Method under Non-loading Condition

针对轨索移梁新工艺在悬索桥建设中的关键技术问题,将轨索节段离散成两节点直线单元,建立轨索移梁系统空载状态下的整体力学分析模型,推导出主缆、吊索、轨索等各构件受力状态的计算方程并求解.设计制作了矮寨悬索桥轨索移梁体系的整体缩尺模型并将模型试验与理论分析结果进行了比较.本文所提方法的计算结果与模型试验结果吻合良好,表明本文计算分析方法正确有效,能解决轨索移梁工艺整体分析求解问题,并可简化计算分析过程,计算精度和结果能够应用于工程的初态分析和求解,是一种适合于轨索移梁工艺空载状态下找形计算分析方法.

The integral mechanic model of the non-loading rail cable launching system was established to deal with the stiffening girders construction in suspension bridge.The rail cable segment was discretized into two-node line element.And the governing equations for the rail cable launching system,which consists of the main cable,the sling, the saddle and the rail cable,were determined.Moreover,a 1∶33 reduced-scale experimental model for the rail cable launching system of Aizhai suspension bridge was constructed.The conclusions obtained from the theoretical analysis and experiments were compared.It is shown that the results of presented calculation method match well with that from the model test.Also,the accuracy and effectiveness of the proposed method are manifested,which can be used to solve the problem about rail cable launching system and simplify the calculating process.The calculation accuracy and results for this method can be employed to the initial-state analysis.This indicates that the recommended analytical method is suitable for shape-looking calculation and analysis of the non-loading rail cable launching technology.