146_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

146_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - Ole...

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OF27 Accuracy of Pile Statistical Analyels of Dynamic Formulaa ~ Driving Formulae: and the Wave Equation (After Pouloe and Davl. . 1880) Upper Limit of No. of Standard 98" Sefety If Nomine' Static Deviation Lower Limit Safety loading the formulae have a Formula Ref. on f4 Ie 1.0 Factor Te.t. 0 Engineering A 0.78 26.0 0.8 171 wide range of accuracy: News F 0.70 17.5 5.8 118 (courtesy of OFI) 0.27 3.8 1.4 60 F 0.37 10.1 2.4 118 Janbu 0.25 3.8 2.3 78 F 0.22 3.2 roo 118 0 the basic energy Janbu 0.25 3.6 2.3 78 concept is correct but F 0.22 3.2 2.0 118 the analysis is generally Danish SaH 0.26 3.8 2.0 78 to simple to work well 0.28 4.1 3.0 56 A 0.30 4.2 2.3 123 Eytelweln 0.67 17.0 7.1 78 Welsbach A 0.36 6.0 2.8 123 0 the formulae tend to Gates 0.35 6.1 2.3 66 group many of the pile Wave saH 0.23 4.0 2.7 78 driving system losses as Equation L 0.26 3.4 2.0 31 hammer efficiency Legend S Ie H ~ Sorensen and Han.en 11967) A .. Aganchow (1982) F - FIlIate (1984)
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Unformatted text preview: Ole F .. Olsen and Rnte (1987) Iiteel pilei In nnd) L = Lowery eUI.11989) ~ "" ratio of measured to computed capacity 800 7eo tonI o chart at right (from OFI) for a 19,500 ft-Ib hammer shows a comparison of the ultimate pile capacity from the ENR formula with that from the wave equation method which does consider the parameters discussed previously o many engineers have put a lot of effort into pile driving formulae without improving their reliability o the bottom line from OFI is: ..... dynamic formulas are fundamentally Incorrect and their continued use is discouraged. " 700 800 600 PILE CAPACITY (toNS) 400 200 100 PENETRATION RESISTANCE (BLOllS/lNCH)...
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