几何位移迭代法在体内张拉成形网格结构形态分析中的简易算法(Ⅰ)

Simple arithmetic of the geometrical displacement-iteration method in the form-finding analysis of ISFL(Ⅰ)

针对体内张拉成形网格结构实际发展需要,明确了结构的三种受力状态—零状态、初始态和荷载态,在几何位移迭代法形态分析方法的基础上,从工程应用的角度提出了一种实用的形态简易算法,并就一个80 m跨的体内张拉成形网格结构实例,用APDL参数化设计语言编程,对该简易算法的特点做了细致的分析,结果表明,几何位移迭代法简易算法找形速度快、迭代计算简单,一般情况下,完全可以满足实际施工要求,而且可以保持结构的完整性,便于荷载态的分析。

In order to put the internal Stretch Forming Latticed Structure （ISFL） into practice, the paper firstly redefined three structure states-zero state,initial state and load state of ISFL. In the point of the engineering-oriented application,the simple applied form-finding arithmetic is then proposed, which is based on the geometrical displacement iterative method. A detailed study on the form-finding process is carried out by parametric design language APDL programming analysis, which based on an ISFSL with a long span of 80 m. The result shows that the simple arithmetic with very simple, great efficiency and speed is commonly satisfied to the form-finding of ISFL. Furthermore, the method can ensure the integrality of the structure which is convenience to load analysis.