Development of variable LRFD \0x03C6 factors for deep foundation design due to site variability [summary].
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2012
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Edition:Summary.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ;
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Abstract:Both the Florida Department of Transportation (FDOT) and the Federal Highway Administration (FHWA) specify use of fixed resistance factors (φ) for Load and Resistance Factored Design (LRFD) of deep foundations, depending on design approach and redundancy of the foundation. A specified φ for a design requires a certain level of reliability, a function of uncertainties associated with material properties, construction methods, and selected design approach. Subsurface spatial variability is a significant uncertainty; for instance, Florida’s coastal terrain presents stiff challenges to quantifying variability of soil/rock properties.
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