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

220Table 6.1, 11 in sand, 12 in clay, and 9 in mixed soils were used for LRFD resistance factorscalibration for WEAP at the EOD condition.Unfortunately, the PILOT database contains no pile strain and accelerationmeasurements, recorded using a Pile Driving Analyzer (PDA) described in Chapter 2. Thesemeasurements are required in CAPWAP analysis as boundary conditions for pile resistanceestimations.6.4.2. Field tests dataTo collect the pile strain and acceleration records for CAPWAP analysis and pilesetup data as well as to populate the existing PILOT database, 10 full-scaled pile tests wereconducted to cover all five geological regions in the State of Iowa. These pile tests involveddetailed site characterization using both in-situ subsurface investigations and laboratory soiltests. Prior to pile driving, the test piles were instrumented with strain gauges along theembedded pile length for axial strain measurements during SLTs. Steel HP250 piles wereselected for all test piles denoted from ISU1 to ISU10, as listed in Table 6.2. Applying the70%-rule, test piles ISU9 and ISU10 were embedded in sand profiles, test piles ISU2, ISU3,ISU4, ISU5, and ISU6 were embedded in clay profiles, and test piles ISU1, ISU7, and ISU8were embedded in mixed soil profiles. During pile driving, EOD and restrikes, the PDAmeasurements and pile driving resistances in terms of hammer blow counts were recorded.After completing the last restrike, a vertical SLT was performed on each test pile followingthe ―Quick Test‖ procedure of ASTM D 1143. Details of the field tests were described inChapter 3 and Ng et al. (2011).Table 6.2 lists the time of SLTs after the EOD and the Davisson’s measured pileresistances. Also, the estimated pile resistances at the EOD condition for both WEAP andCAPWAP were summarized, whereas the pile resistances estimated from the last restriketests for both WEAP and CAPWAP are summarized in Table 6.3. These pile resistanceswere used for LRFD resistance factors calibration for WEAP and CAPWAP at both the EODand the beginning of restrike (BOR) conditions.