Load and resistance factor design of drilled shafts at the service limit state
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A practical and efficient procedure for evaluation of drilled shafts at the service limit state is proposed. The procedure uses Load and Resistance Factor Design (LRFD) concepts to achieve target probabilities of failure without requiring case-specific probabilistic analyses. Proposed resistance factors are primarily dependent on four parameters: the normalized load, the coefficient of variation of the geomaterial strength, the target probability of failure, and the shaft length-to-diameter ratio. The proposed procedure can be implemented using several charts or analytical equations provided.