Stress analyses in single-deck and double-deck oating 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 dierent classes of ground motions including near-eld and far-eld records is evaluated. Results indicate that far-eld 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 floating-roof cylindrical tanks