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This paper considers the buckling and post-buckling behavior of empty metal storage tanksunder wind load. The structures of such tanks may be idealized as cantilever cylindrical shells, and thestructural response is investigated using a computational model. The modeling employs a doubly curvedfinite element based on a theory by Simo and coworkers, which is capable of handling largedisplacements and plasticity. Buckling results for tanks with four diferent geometric relations arepresented to consider the influence of the ratios between the radius and the height of the shell (R/L), andbetween the radius and the thickness (R/t). The studies aim to clarify the diferences in the shellsregarding their imperfection-sensitivity. The results show that thin-walled short tanks, with R/L=3,display high imperfection sensitivity, while tanks with R/L= 0.5 are almost insensitive to imperfections.Changes in the total potential energy of tanks that would buckle under the same high wind pressures arealso considered.