79_HWKTTE 4004c - CHAPTER 7 SKIN AND TIP STATIC CAPACITY...

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69 CHAPTER 7 SKIN AND TIP STATIC CAPACITY ASSESSMENT OF DRIVEN PILES As discussed in the previous chapter, the PDA Case method was found to be as accurate as the other dynamic methods such as Paikowsky and CAPWAP procedures. This trend was observed for driven piles at both, EOD and BOR. The PDA Case method results depend on the estimated damping coefficient, J c . The recommended values for J c vary according to the soil type near the tip of the pile. On the other hand, CAPWAP selects the Coefficient of Damping and the pile resistance in such a way that the force trace can be reproduced from the velocity trace. The latter permit CAPWAP to estimate the skin resistance distribution and the tip resistance for any given pile. The estimate of the skin and tip capacity in addition to the distribution of damping and skin friction along the pile from CAPWAP have resulted in its use (scour areas, etc.) versus the PDA, in which only the total static capacity is obtained. However, CAPWAP is a multi-variable program that requires iterations (i.e. time consuming) and a
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79_HWKTTE 4004c - CHAPTER 7 SKIN AND TIP STATIC CAPACITY...

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