体内张拉成形空间网格结构的形态分析——几何位移迭代法

Form-finding Analysis of the Internal-prestressed Reticulated Space Structure Through Posttensioning:Geometrical Displacement-iteration Method

摘要: 针对体内张拉成形空间网格结构实际发展需要,从工程应用的角度定义了该类结构的3种受力状态:零状态、初始态和荷载态.在此基础上提出了一种形态分析方法——几何位移迭代法,并以一个80m跨的体内张拉成形空间网格结构为例,对其找形过程特点做了细致分析.结果表明,几何位移迭代法找形精度高、速度快,非常适合于体内张拉成形空间网格结构形态研究,而且可以保持结构的完整性.

Abstract: In order to put the internal-prestressed reticulated space structure through posttensioning(IRSSP) into practice,the paper firstly redefined three structure states-zero state,initial state and load state of IRSSP. The geometrical displacement iterative method is then proposed,which is based on the three states mentioned above.A detailed study on the form-finding process is carried out which based on an IRSSP with a long span of 80 m.The result shows that the geometrical displacement iterative method is of high precision,great efficiency and the speed is quite suitable to the form-finding of IRSSP.Furthermore,the method can ensure the integrality of the structure.