Update the Pile Design by CPT Software to Incorporate Newly Developed Pile-CPT Methods and Other Design Features
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2023-09-01
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Edition:Final Report July 2017 – March 2023
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Abstract:This study presents the performance evaluation of 21 direct pile-CPT methods for estimating the ultimate load carrying capacity of square precast prestressed concrete (PPC) piles driven into Louisiana soils utilizing the cone penetration test (CPT) data. The investigated methods are: Schmertmann, De Ruiter and Beringen, Bustamante and Gianeselli (LCPC), Philipponnat, Price and Wardle, Zhou, Tumay and Fakhroo, UF (2007), probabilistic, Aoki and De Alencar, Penpile, NGI, ICP, UWA, CPT2000, Fugro, Purdue, German, Eurocode7, ERTC3, and Togliani direct pile-CPT methods. A search was conducted in the DOTD files to identify pile load test reports with CPT soundings adjacent to test piles. A database of 80 pile load tests that were loaded to failure, were identified, collected, and used in analysis. The measured ultimate load carrying capacity for each pile was interpreted from the pile load test using the Davisson and modified Davisson interpretation methods. The ultimate pile capacities estimated from the pile-CPT methods were compared with the measured ultimate pile capacities. In this study, three approaches were adopted to evaluate the performance of pile-CPT methods. In the first approach, three statistical criteria were used: the best fit line of predicted (Qp) versus measured (Qm) capacity, arithmetic mean and standard deviation of Qp⁄Qm, and the cumulative probability of Qp⁄Qm. The results of this evaluation showed the following best-performed pile-CPT methods in order: LCPC, ERTC3, Probabilistic, UF, Philipponnat, De Ruiter and Beringen, CPT2000, UWA, and Schmertmann methods. The second approach used to evaluate the 21 pile-CPT methods is the MultiDimensional Unfolding (MDU), which showed similar ranking of top-performed pile-CPT methods. The third approach used for evaluating the pile-CPT methods was based on LRFD reliability analysis in terms of resistance factor and efficiency, and the results of evaluation are consistent with the previous two criteria.
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