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97_HWKTTE 4004c

# 97_HWKTTE 4004c - knowing the total static capacity the...

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87 In Chapter 6, it has been explained how the coefficient of variance could be a useful tool to measure the accuracy of a dynamic method. Making use of this criterion, the suggested method (COV R equals 0.29) can be considered the most accurate of the three methods followed by the PDA (COV R equals 0.32). The CAPWAP procedure was the less accurate of the three methods (COV R equals 0.45). Analysis of Skin and Tip Capacity Predictions The number of cases to evaluate the skin and tip predictions is much smaller than the number of cases used for total capacity prediction. For the skin prediction, the total number of cases is 10, while for the tip prediction the number of cases drops to only six. The reason for this decrease in number of cases is the limited number of tensile test and Osterberg tests. From the six Osterberg tests, one test failed at the tip and five failed at the skin). The tensile tests are very helpful to determine the skin capacity. With the skin capacity calculated, and

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Unformatted text preview: knowing the total static capacity the tip capacity can be calculated. Table 7-5. Statistical Analysis for Skin and Tip Predictions Method Skin Capacity Prediction (10 Cases) Tip Capacity Prediction (6 Cases) Mean, λ R Std. Dev. σ COV R Mean, λ R Std. Dev. σ COV R Suggested 1.04 0.40 0.39 0.96 0.16 0.17 Method CAPWAP 0.80 0.35 0.43 1.08 0.59 0.55 Method 1 1.29 1.15 0.89 1.94 2.47 1.27 88 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Davisson Skin Capacity (kN) Number of Cases = 10 Mean = 1.04 Std. Dev. = 0.40 COV = 0.39 Figure 7-8. Davisson Capacity vs. Suggested Method Capacity (Skin Capacity) 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Davisson Skin Capacity (kN) Number of Cases = 10 Mean = 0.80 Std. Dev. = 0.35 COV = 0.43 Figure 7-9. Davisson Capacity vs. CAPWAP Capacity (Skin Capacity)...
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