105_HWKTTE 4004c - 95 5. The old methods (i.e. Gates, FDOT,...

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95 5. The old methods (i.e. Gates, FDOT, ENR, and Modified ENR) gave good estimates of the Davisson capacity for piles with Davisson capacity less than 200 tons (1779 kN). 6. The Gates formula, when used separately for Davisson capacity larger than 1779 kN or less than 1779 kN, may have comparable accuracy (COV’s) with the modern methods. 7. For ASD design with dynamic methods, the following safety factors are recommended to meet a probability of failure of 0.62 ~ 2.50 %: 1.8, 2.0 and 2.5 for CAPWAP, PDA, and Paikowsky’s energy method at EOD, and 2.25, 2.5 and 3.5 at BOR, respectively. Currently, a safety factor of 2.5 is used for CAPWAP, PDA, and Paikowsky’s method, for both, BOR, and EOD. The driving formulas are usually applied at EOD only, and safety factors of 1.9, 14.0, 11.0, and 2.0 are recommended for FDOT, ENR, modified ENR, and Gates formulas, respectively. Recommendations The results presented in this study reflect the pile driving history of Florida. The number of piles considered is based on the availability of dynamic and static load test
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105_HWKTTE 4004c - 95 5. The old methods (i.e. Gates, FDOT,...

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