Stress Analyses in Single Deck and Double Deck Floating Roofs Subjected to Earthquake Ground Motions

Abstract

Abstract. 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 di erent 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 oating-roof cylindrical tanks.

Seismic Analysis of Double Deck Floating Roofs of Siraf Storage Tanks with Condensate, Light and Heavy Crude Oils

“…Schematic configuration of a DDFR storage tank [1] vibrations of circular plates resting on a sloshing liquid free surface. Golzar et al [10,11] idealized floating roofs as an isotropic elastic plate with uniform stiffness and thickness. Matsui [12] modeled SDFR as an elastic curved beam connected to the pontoon.…”