悬索桥结构内力及变形的精细计算方法研究

Study of An Accurate Calculation Method for Internal Force and Deformation of Suspension Bridge

文章基于有限位移弹性理论,采用带动坐标的混合法对杆系结构的有限元平衡方程进行求解。由此建立了一套平面杆系结构的几何非线性有限元分析方法,在此方法的基础上,通过改进索鞍单元模拟施工过程中索鞍的顶推。最后以贵州H大桥为背景,对其恒载状态下的结构内力及变形进行了施工过程的精细计算,计算结果表明:算法正确,精度较高,收敛较快,程序具有较强的实用性。

Based on elastic theory of finite displacement, the mixed method with moving coordinates is used to solve the finite element equation. Then a geometric non - linear finite element method for the structures composed of trusses and beams is established. Furthermore, taking Beipan River bridge as an example, the construction process are calculated precisely and load testing are made. The results show that the method is efficiency and accuracy, and has practicability in engineering as well.