Stress analyses in single-deck and double-deck foating roofs subjected to earthquake ground motions

This paper investigates the stress patterns in circular single- and double-deck oating roofs excited by earthquake ground motions. variational formulation is employed to derive the governing equations. response of the oating roofs to different classes of ground motions including near-field and far-field records is evaluated. results indicate that far-field earthquakes produce larger wave elevation but smaller bending stresses in the oating roof. moreover, the bending stresses in double-deck roofs emerge in a smooth and approximately symmetric pattern with a peak around the mid-span radius while the peak values of bending stress in single-deck oating roofs occur at the vicinity of deck center and at the deck-pontoon interface. the results can have practical implications in the design process of oating-roof cylindrical tanks.