9_HWKTTE 4004c - accurate than the old driving formulas...

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ix Abstract of Thesis Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Master of Engineering LOAD RESISTANCE FACTOR DESIGN (LRFD) FOR DRIVEN PILES BASED ON DYNAMIC METHODS WITH ASSESSMENT OF SKIN AND TIP RESISTANCE FROM PDA SIGNALS By Ariel Perez Perez December, 1998 Chairman: Dr. Michael C. McVay Major Department: Civil Engineering Eight dynamic methods to estimate the static capacity of driven piles were evaluated based on a Florida database and Load Resistance Factor Design (LRFD). The dynamic methods investigated were four stress wave approaches (CAPWAP, PDA, Paikowsky Energy, and Sakai Energy) and four driving formulas (ENR, modified ENR, FDOT, and Gates). In the case of the older driving formulas, the database was broken into both small (i.e. Davisson capacity less than 1779 kN) and large (Davisson capacity larger than 1779 kN) capacity piles. It was demonstrated that the modern methods based on wave mechanics, such as CAPWAP, PDA, and Paikowsky’s energy method, are more
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Unformatted text preview: accurate than the old driving formulas. The utilizable measured Davisson capacity, defined as φ/λ R (ratio of resistance / mean capacity), shows that the new dynamic methods are more cost effective to meet a reliability index in comparison with the old x methods based on momentum conservation. In addition, the Gates formula, when used separately for Davisson capacity larger than 1779 kN or less than 1779 kN, may have comparable accuracy with the modern methods. A suggested empirical method is presented to calculate the total, skin, and tip static resistance of driven piles. This method has proved to be equally or more accurate than the most widely used method (i.e. PDA, and CAPWAP). Additional features of the suggested method include determining the total, skin, and tip static capacities as the piles are being driven, saving construction time, therefore, saving construction costs....
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9_HWKTTE 4004c - accurate than the old driving formulas...

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