基于ANSYS二次开发下考虑节点半刚性连接.pdf

基于 ANSYS 二次开发下考虑节点半刚性连接 对凯威特型单层球壳内力的影响分析 李志敏, 周臻 (东南大学土木工程学院, 南京 210096) 摘 要：采用任意半刚性连接空间梁单元的刚度矩阵, 基于 ANSYS 二次开发功能, 编制了 考虑半刚性连接的空间梁单元用户程序. 该用户单元程序由一组介于 0～1 之间的无量纲刚 度因子描述单元的连接刚度, 方便分析从理想铰接到完全刚接的各种连接刚度的空间杆系 结构, 通过算例证明了程序的正确性. 同时, 使用该用户单元对凯威特型单层球壳进行了静 力分析, 分析中考虑矢跨比和连接刚度的不同, 得出了不同矢跨比下该类结构杆件内力随节 点连接刚度变化的规律. 关键词：ANSYS 二次开发; 半刚性连接; 凯威特型单层球壳; 静力分析 The analysis of influence exerted on the internal forces of Kiewitte-type single-layer reticulated shells with semi-rigid connections based on the redevelopment of ANSYS Zhimin Li, Zhen Zhou (College of Civil engineering, Southeast University, Nanjing 210096) Abstract ：Based on the redevelopment of ANSYS, the user element program was given by using the stiffness matrix of arbitrary spatial beam element with semi-rigid connections. In the program, the connection stiffness is expressed as the stiffness factors which take the value between 0 and 1. Therefore it is convenient to analyze the spatial frames with arbitrary connections, including the spatial truss and the fully rigid-framed structures. The program was proved be right by numerical example. In addition, the program was used to do static analysis of Kiewitte-type single-layer reticulated shells with semi-rigid connections. In the analysis, the changing law of internal forces during the transformation of connection rigidness with different rises is obtained. Key Words ：the redevelopment of ANSYS; semi-rigid connection; Kiewitte-type single-layer reticulated shells and static analysis 近年来, 空间网壳结构因其造型优美, 受力合理等诸多优点获得了较大的发展和应用. 网壳结构的分析计算方法在经历了早期计算技术较落后时的各种近似分析方法（如拟壳法） 后, 目前使用最广泛的是空间杆系和空间梁系有限元法. 有限元法假定对于单层网壳节点连 接为完全刚性的, 而对于双层网壳节点则为理想铰接的,