Abstract
Abstract Deformation was measured as a function of internal static gauge pressure for galvanized steel spiral 12 in. × 43 in. (305 mm × 1092 mm) flat oval ducts. Both unreinforced and externally reinforced ducts were considered. Dial deflection gauges were used to measure the duct deformation at prescribed locations on the top and bottom surface of the test duct and compared to corresponding predictions generated using a nonlinear finite element model that accounted for the self-weight of the duct walls. The Average Wall Thickness (AWT) method was utilized to account for the presence of a continuous spiral seam. Shell elements were employed to represent the thin-walled structure of the ducts. External trapeze reinforcements spaced 3 ft (0.91 m), 6 ft (1.83 m), and 12 ft (3.66 m) apart were modeled using beam elements. The non-linear finite element model of the duct system was found to yield realistic deformation predictions. It was concluded that finite element modeling can be used to guide decisions regarding the selection of a thicker duct wall, or inclusion of either internal or external reinforcement, if concerns exist about excessive duct or reinforcement deformation caused by high internal gauge pressures.
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