United States Department of Transportation
i
Implementation of LRFD Geotechnical Design for Bridge Foundations
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2010-10-01
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[PDF-1.53 MB]
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Abstract:This document is the reference manual for NHI training course No. 132083, both developed to assist State Departments of Transportation (DOTs) in the successful development of LRFD Design Guidance for bridge foundations based on the 2010 AASHTO LRFD Bridge Design Specifications and their local experiences. Initially, an LRFD Implementation Plan of six consecutive steps is discussed and the remainder of the manual presents recommendations to assist DOTS with implementation of these steps. The principal changes in the AASHTO design specifications from ASD to LRFD are presented. The DOTs have three options for selection of LRFD geotechnical design methods: adoption of AASHTO’s LRFD methods or development of local LRFD methods by fitting to ASD or through reliability analysis of information collected at load test sites. The calibration methods and conditions for these three options are discussed to assist DOTs in implementation of these options. Procedures are furnished to evaluate and address the project site variability. Then, the three implementation options are evaluated and compared to assist DOTs with selection of the most appropriate option. The advantages of development of local reliability-based LRFD design methods over other implementation options are demonstrated. The implementation of AASHTO LRFD for geotechnical design for bridge foundations will lead to savings or to equivalent foundation costs compared with ASD methods. At the end, a roadmap for development of LRFD design guidance that consists of LRFD design specifications and delivery processes for bridge foundations is discussed.
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Content Notes:FHWA COTR – Louisa Ward
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