A probe into nonlinear stability of single-layer reticulated shells by means of random imperfection modal method

作者：Wei, De-Min; Tu, Jia-Ming

来源：Journal of South China University of Technology(Natural Science Edition), 2016, 44(7): 83-89.

DOI：10.3969/j.issn.1000-565X.2016.07.013

• Consistent imperfection modal me-thod
• Modal method
• Rise span ratio
• Single-layer reticulated shells
• Ultimate loads

The nonlinear stability of Kiewitt-Lamella single-layer reticulated shells is analyzed by means of random imperfection modal method, and the stable ultimate load of the reticulated shell structure, which is affected by both the spatial sample number of random defect and the rise-span ratio, is investigated. Then, a comparison of calculated results is made between random imperfection modal method and consistent imperfection modal method. The results show that (1) the spatial sample number of random defect should be not less than 90 for the stability analysis of structures via statistical method;(2) for the reticulated shell structure with large rise-span ratio, the probabilistic reliability to calculate the critical load via consistent imperfection modal method is rather low, so that it is nece-ssary to verify the critical load with the help of random imperfection modal method;and (3) when the rise-span ratio of a single-layer reticulated shell is less than 1/6, the calculated stable bearing capacities obtained by the two above-mentioned initial defect distribution methods are nearly equal.

• 出版日期2016-7-1
• 单位华南理工大学