论文部分内容阅读
平面索桁架以及由平面索桁架组成的空间索桁结构是一种应用广泛的柔性结构,它依靠拉索的张力提供刚度.寻找柔性结构合理的预应力分布以达到建筑造型和力学性能的要求是其找形分析的主要目的.与索穹顶结构、单层索网结构相比,索桁架的拓扑关系更加简单明确.力密度法、动力松弛法等一般用于解决单层索网等结构由给定预应力确定初始位形的问题,且难以直接应用在通用有限元软件中(如ANSYS).如果套用索穹顶、单层索网等的找形方法(如力密度法、动力松弛法等)进行找形,则无法直接运用通用有限元软件进行分析.本文依据索桁架结构体系简单明确的拓扑关系,发展了一种通过给节点施加位移进行迭代计算的非线性有限元找形分析方法,该方法不同于单层索网或膜结构找形的小杨氏模量法.本方法求解速度较快,结果较为准确,同时便于在现有的通用有限元软件中应用.
The plane cable trusses and the space truss consisting of plane cable trusses are a widely used flexible structure that depends on the tension of the cables to provide rigidity. Finding the reasonable prestress distribution of the flexible structure to achieve the architectural shape and mechanical properties Its main purpose of finding the shape analysis.Compared with the cable dome structure and the single-layer cable network structure, the topological relationship of the cable truss is more simple and clear.It is generally used to solve the structure of single-layer cable network by the methods of force density and dynamic relaxation, It is difficult to apply the prestress directly to the finite element software (such as ANSYS) .If the method of finding the shape of cable dome, single cable net (such as force density method, dynamic relaxation method) Then the general FEA software can not be used to analyze.According to the simple and clear topological relations of cable trussestructure system, this paper develops a non-linear Finite Element Finding Analysis method by applying displacement to the nodes, The method is different from the small Young’s modulus method for finding the shape of a single layer cable network or a membrane structure. The method solves the problem quickly and the result is more accurate. Meanwhile, Element software applications.