板片空间结构缺陷敏感区域

Imperfection sensitive region in sheet-space structure

提出了结构缺陷敏感区域的概念,即结构中对某种缺陷非常敏感的区域.借助于结构缺陷稳定分析的改进随机缺陷法,对板片空间结构的缺陷敏感区域进行了研究,结果证明改进随机缺陷法可定量、准确地分析结构的缺陷敏感区域.对2个算例(单层板杆组合结构和有板立体桁架模型)的缺陷敏感区域进行了分析,得出了相应结构的缺陷敏感区域和影响最大的结点位置,并发现不同结构的支座结点的影响相差很大,说明在对结构进行缺陷稳定分析时应考虑支座结点的缺陷,同时也揭示了缺陷分析中确定性方法不考虑支座结点缺陷的局限性.

The concept of imperfection sensitive region is put forward. Imperfection sensitive region is the region in which the structure is sensitive to a certain kind of imperfections. Advanced stochas- tic imperfections method is used to research the imperfection sensitive region of the sheet-space structure. And the results show that the structural imperfection sensitive region can be analyzed quantitatively and accurately by using this method. Two examples were researched carefully, and their imperfection sensitive regions were determined. The analyses also show the different influence of the supporting nodes in different structures. It indicates that the imperfections of the supporting nodes should be taken into account when the structures with imperfections are studied. It also shows the disadvantage of the certain methods in which the imperfections of the supporting nodes are not considered.