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索杆张力结构是指由索和杆为基本单元,通过施加预应力提供结构刚度的一类空间结构体系。自应力模态是索杆张力结构满足结构自平衡的内力模态,自应力模态的确定是结构后续受力分析及性能研究的基础。提出的力形结合法是在结构初始几何形态的基础上,充分考虑结构的对称性及索受拉、杆受压的特性,依据结构内力自平衡的要求,直接求解出一组自应力模态,该组模态是一组实际可行的杆件内力分布状态。
Cable tension structure refers to the cable and rod as the basic unit, by applying prestress to provide structural rigidity of a class of space structure system. The self-stress mode is the internal force mode that the cable tension structure satisfies the self-balancing structure. The determination of the self-stress mode is the basis for the subsequent stress analysis and performance study of the structure. The force-shape combination method proposed is based on the initial geometry of the structure and fully considers the symmetry of the structure and the characteristics of cable tension and compression. According to the requirement of self-balance of structural internal forces, a set of self-stress modes , The group modal is a group of practical conditions of internal force distribution.