United States Department of Transportation
i
Review and Refinement of SDDOT’s LRFD Shallow Foundation Design Method
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2020-07-09
[PDF-1.86 MB]
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Edition:Final Report, Apr 2015 – Jan 2019
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Abstract:The objective of this project was to conduct a comprehensive review of Load Resistance Factor Design (LRFD) for bridge and wall shallow foundations. LRFD is a limit state design methodology based on reliability and probability. Specifically, this study investigated the concept, application, and implementation status of LRFD in shallow foundation designs for the South Dakota Department of Transportation (SDDOT) based on a review of the published research papers, American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications, bridge design manuals and/or geotechnical manuals of instruction (MOI) from other states, research reports published by many US state and federal agencies including Federal Highway Administration (FHWA), National Cooperative Highway Research Program (NCHRP), and the National Highway Institute (NHI), in addition to specifications used internationally. The results of this study show that the LRFD approach has already been adopted by most US states due to mandatory use on federally funded projects. However, whereas deep foundation design parameters are relatively well established for LRFD methods, local calibration of shallow foundation design parameters has not yet been performed in most states. This report examines the current status of LRFD and discusses its limited level of implementation for shallow foundation design in South Dakota, provides a set of recommendations that SDDOT can consider as it pursues implementation of LRFD in its construction projects with the ultimate goal of economical designs incorporating quantitative estimations of failure.
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