Verification of WBUZPILE Design Methodology and the Development of a LRFD Driven Pile Resistance Factor Calibration for Alabama Soils
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2020-05-01
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Edition:Final Report
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Abstract:In 2007, the American Association of State Highway and Transportation Officials published a new policy requiring the application of the Load and Resistance Factor Design (LRFD) methodology for pile foundations. The Alabama Department of Transportation (ALDOT) currently uses LRFD, however, the LRFD resistance factor used is not based on reliability theory and does not necessarily represent the Alabama soils. A pair of authors calibrated LRFD resistance factors for Alabama soils using First Order Second Moment (FOSM). However, FOSM leads to over-conservatism. Thus, this study calibrated LRFD resistance factors using the First Order Reliability Method and Monte Carlo Simulation (MCS) besides FOSM. MCS was found to be the most efficient method. Moreover, pile setup was incorporated into the LRFD resistance factor calibration and generated a reasonable increase on the resistance factors at 30, 45, 60, and 90 days after the end of initial driving. Finally, the calibrated resistance factors are compared to similar resistance factors calibrated within the United States to evaluate the performance of the prediction methods used in Alabama. The results generate a variety of reliability-based resistance factors that are recommended for use depending on the standard ALDOT design methodology and the field test procedures used.
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