United States Department of Transportation
i
Development of load and resistance factor design for ultimate and serviceability limit states of transportation structure foundations.
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2011-12-01
[PDF-3.23 MB]
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Abstract:"Most foundation solutions for transportation structures rely on deep foundations, often on pile foundations
configured in a way most suitable to the problem at hand. Design of pile foundation solutions can best be pursued by clearly
defining limit states and then configuring the piles in such a way as to prevent the attainment of these limit states. The
present report develops methods for load and resistance factor design (LRFD) of piles, both nondisplacement and
displacement piles, in sand and clay. With the exception of the method for design of displacement piles in sand, all the
methods are based on rigorous theoretical mechanics solutions of the pile loading problem. In all cases, the uncertainty of
the variables appearing in the problem and of the relationships linking these variables to the resistance calculated using these
relationships are carefully assessed. Monte Carlo simulations using these relationships and the associated variabilities allow
simulation of resistance minus load distributions and therefore probability of failure. The mean (or nominal) values of the
variables can be adjusted so that the probability of failure can be made to match a target probability of failure. Since an
infinite number of combinations of these means can be made to lead to the same target probability of failure, we have
developed a way to determine the most likely ultimate limit state for a given probability of failure. Once the most likely
ultimate limit state is determined, the values of loads and resistances for this limit state can be used, together with the values
of the mean (or nominal) loads and resistances to calculate load and resistance factors. The last step in the process involves
adjusting the resistance factors so that they are consistent with the load factors specified by AASHTO. Recommended
resistance factors are then given together with the design methods for which they were developed."
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