【摘要】 本文以三维连续体的虚功增量方程为基础,导出了空间梁元大挠度问题内力分析的UL列式法,提出了新的几何刚阵形式。理论与算例都表明:本文方法与ADINA的4号梁元精度相同,但计算时间大大减少,并能用于任意形状截面的杆件。用本文方法编制的NACS程序具有分析大型空间柔性结构在非常规荷载下的强非线性行为的能力,已用于斜拉桥、悬索桥的非线性分析中。更多还原

【Abstract】 Based on the virtual work increment equation for the three-dimensional continuum, the Update Lagrangian formulation for large displacement ana-lysis of spacial beam elements is developed and a new type of geometric stiff-ness matrix is presented.Compared with No.4. Element in ADINA, the proposedmethod has the same accuracy but reduces the computing cost greatly. It isalso suitable for beams with arbitrary section. A computer program NACSdeveloped by the proposed method is available for the analysis of strong no-nlinear behavior of large flexible spacial structures under overloaded conditionand has been used for nonlinear analysis of cable stayed bridges and suspensionbridges.更多还原