87_HWKTTE 4004c - 77 Figure 7-4 shows the regression curve...

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77 Figure 7-4 shows the regression curve for the J c . This curve is significant, because it allows us to obtain a Case damping coefficient, J c , directly from the PDA traces, without taking into consideration the soil type in which the pile is embedded. The suggested equation to correlate tip to skin ratio to J c is 2686 . 0 ln 09744 . 0 + - = Skin Tip J c (7-6) Because the latter equation was obtained from a comparison with the Davisson’s capacity at BOR, it is only recommended for estimating the pile capacity from dynamic tests performed at BOR. Sensitivity Analysis of Case Damping Coefficient, J c In order to measure how sensitive the Case method resistance (RSP) solution is to the variation of J c , the coefficient of variance was used. The following steps were followed to obtain a relation between the coefficient of variance for the resistance and the coefficient of variance for J c . Using the Case method solution for the pile resistance, R, the average (bars for average) resistance based on the average value of J
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87_HWKTTE 4004c - 77 Figure 7-4 shows the regression curve...

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