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Review and Refinement of SDDOT’s LRFD Deep Foundation Design Method
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2011-01-31
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[PDF-3.77 MB]
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Edition:Final Report January 2009 to January 2011
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Abstract:It is well-known by practicing engineers that uncertainty exists in design and that this uncertainty arises from numerous sources. Reliability-based design (RBD) methods address this by incorporating uncertainty in the design procedure and process. The FHWA mandated the use of the Load and Resistance Factored Design (LRFD) methodology for all federally funded transportation projects beginning in October 2007. The South Dakota Department of Transportation’s (SDDOT) current deep foundation investigation procedures and design methodologies are unique and therefore require specific calibration for use in LRFD design. The first phase of this project reviewed the literature, conducted interviews with adjacent states, examined LRFD implementation, and reviewed the SDDOT’s design method relative to FHWA requirements. The second phase of the project consisted of attempting to calibrate existing field data to generate resistance factors in assisting the SDDOT in transition to a full LRFD platform rather than using the calibration-to-fit method currently employed. Data was collected from available load tests within South Dakota which, when suitable, was the basis of the probabilistic analysis of the design methodology. This project identified the need for the SDDOT to collect field data to both verify the basis of their capacity predictions for deep foundation design as well as supplementing a sparse data set for LRFD resistance factor calibration.
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