S - Kam Ng PhD Dissertation Final.pdf - Digital Repository of CCEE ...

92resistance factors (0.65 and 0.75) listed in Table 2.16 for dynamic testing without static loadtesting were developed for the beginning of restrike (BOR) conditions, and their applicationsfor the end of driving (EOD) conditions may yield conservative results because of soil setupup. The 0.50 resistance factor for wave equation analysis is established based on calibrationby fitting to past allowable stress design practice. Local experience or test results should beused in wave equation analysis to enhance the confidence of pile resistance estimation, andfield verification of the hammer performance should be conducted.2.7.5 Other LRFD resistance factorsBased on the calibration procedures described in Section 2.7.2, resistance factors fordriven piles were calculated by other researchers based on upon their available regionaldatabase. Table 2.17 summarizes the resistance factors and the corresponding efficiencyfactors for the dynamic testing with signal matching procedure (CAPWAP) and the waveequation analysis.DynamicAnalysis MethodDynamic testingrequires signalmatchingTable 2.17: Other LRFD resistance factors for driven pilesReferencePerez (1998)Paikowsky et al.(2004)Allen (2005)Source ofDatabaseFloridaDOTNationalPaikowskyet al. (2004)EOD orBORResistanceFactor, φ(β T = 2.33)EfficiencyFactor,φ/λEOD 0.73 (c) 0.46BOR 0.58 (c) 0.46EOD 0.64 0.40BOR 0.65 0.56BOR 0.71 (a) n/aEOD 1.31 (b) 0.36Abu-Farsakh et al. LouisianaBOR(2009)DOT0.55 0.44(14 days)Paikowsky et al.National EOD 0.39 0.24(2004)TransportationWave equationFloridaResearch BoardEOD 0.35 (c) n/aanalysisDOT(2009)PaikowskyAllen (2005)EOD 0.40 n/aet al. (2004)(a) ‒ Based on Monte-Carlo simulation method; (b) ‒ For Lousiana soft soil; (c) ‒ Based on β T = 2.50.