关于索杆杂交结构两个问题的探讨

Discussion on Two Questions of Cable-bar Hybrid Structures

对于索杆杂交结构,可以根据平衡矩阵理论确定体系在初状态几何下的整体预应力分布和大小,同时也需满足杆件的变形相容条件和本构关系。本文对索杆杂交结构采用平衡矩阵理论进行了探讨,指出索杆杂交结构不存在独立柔度分布模态。索杆杂交结构一般是杆件拓扑关系有规律的对称结构体系,位置对称的杆件其预应力相同,本文提出了一种新的索杆杂交结构整体可行预应力求解方法,即根据杆件的对称性,直接从体系的平衡方程求解整体可行预应力。

For cable-bar hybrid structures the initial prestress distribution can be determined by using the equilibrium matrix theory, meanwhile the element＇s geometrical compatibility condition and constitutive relations should be considered. This paper discusses the application of the equilibrium matrix theory in the cable-bar hybrid structures, pointing that there is no independent flexibility distribution mode f^r the structures. The cable-bar hybrid structures are generally symmetrical in geometry, and the symmetrical elements have the same prestress. This paper gives a new method in which on the basis of the cable dome＇s symmetry the integrity feasible prestressing is solved directly from the equilibrium equation.