摘要
以空间结构体系几何分析为基础,以Levy索穹顶结构形式为算例,充分考虑结构本身的对称性,从平衡矩阵理论出发,运用奇异值分解法和整体可行预应力概念讨论了Levy索穹顶结构初始预应力的确定问题,同时利用非线性有限元方法和迭代技术修正了考虑结构自重后的真实初始预应力分布情况,计算表明在竖向荷载作用下结构由于部分拉索退出工作而达到了极限状态。
Taking the Levy cable dome as an example and considering the symmetry of the structure,the initial prestress of the dome was solved by using the method of singular value decomposition on the base of the geometrical configuration analysis of spatial structure,equilibrium matrix theory and the concept of feasible prestress.The nonlinear finite element method and iterative strategy was used to modify the real prestress distribution after considering the gravity of the structure.It was found that this kind of spatial structure may reach the limiting state when some cables slack under the vertical load condition.
出处
《结构工程师》
2010年第5期26-31,共6页
Structural Engineers
