Resistance factors are developed for drilled shafts (bored piles) in sand and clay for design methods based on soil variables. A rigorous analysis was performed in which the uncertainties of the design variables and equations were systematically quantified. Monte-Carlo simulations were then performed to obtain the distributions of the shaft and base capacities and applied dead and live loads. The limit state and nominal resistances and loads were identified, and the optimal dead and live load factors calculated. The optimal resistance factors were then adjusted for use with load factors recommended by FHWA. Use of these factors in the design of drilled shafts using LRFD is then discussed.
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