索膜结构的分步计算与整体计算对比

Comparison of decoupled method and coupled method for analysis of cable-membrane structures

目前,膜结构设计和验算中的两种方法——分步计算和整体计算均为人们所采用.分步计算是单独分析索和膜,再将反力施加在支撑结构上进行分析;而整体计算是将索和膜与下部支撑结构一起进行分析.随着计算机辅助设计软件的发展,过去不得已而为之的分步计算方法越来越显露出其不足之处.本文通过作者所在的研究组自主开发的索膜专用设计软件CAFA,分别由这两种方法对两个算例进行了对比分析,在此基础上得出在索膜结构设计中整体计算的必要性.

There are two methods adopted in the design and analysis of membrane structures-decoupled method and coupled method. The decoupled method is to analyze the cable and membrane separately then apply the reaction force to the support system. While the coupled method is to analyze the cable-membrane with the support system together. With the development of the computer aided design, the decoupled method used shows more and more shortcomings. CAFA is presented in this paper and a conclusion membrane structures design is drawn. A comparison analysis about these two methods using that the coupled calculation should be adopted in the membrane structures design is drawn.