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From the paper cited in the previous slide.
Conclusions:
"It has been recognized that a single layer cylindrical lattice shell roof structure displays a complex form of imperfection-sensitive nonlinear buckling behavior. This prebuckling nonlinearity has been understood to be induced by the total equivalent imperfections involving the potential-load-induced imperfection and actual-geometric imperfection. Based upon the reduced stiffness buckling analysis associated with the lower bound for imperfection-sensitive buckling load carrying capacity, an alternative design evaluation procedure of overall buckling loads for the single layer cylindrical lattice shell roof structures has been proposed. The previous fruits using the parametric nonlinear buckling analysis for the FEM modelling have been used in this paper to confirm the quality of the results by the present evaluation method. The present design concept provides a simple, safe, and rational basis and would also provide an understanding of greater significance for many other single layer lattice shell buckling problems."
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