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

Ultimate Capacity (kips)Stroke (ft)Compressive Stress (ksi)Tension Stress (ksi)67parameters, pile information, and the soil skin friction distribution. Since the hammer blowcount is typically recorded during pile drivings, the pile responses can be estimated using thisbearing graph. For instance, if 197 blows/m (60 blows/ft) of pile penetration is recorded, theultimate pile resistance is estimated to be 1068 kN (240 kips), which is considered as the pileresistance estimated using WEAP for the Load Resistance Factor Design (LRFD) resistancefactors calibration discussed in Section 2.7. In addition, the hammer stroke is expected toreach at least 2.9 m (9.6 ft) to achieve the 60 blow counts. The pile compressive and tensilestresses are expected to be 290 MPa (42 ksi) and 15 MPa (2.2 ksi), respectively, whichprovide the necessary information for comparison with the allowable driving stress limitslisted in Table 2.2.Iowa States University09-Feb-2011Clarke ST EODGRLWEAP (TM) Version 20055042405040DELMAG D 16-32Efficiency 0.80030203020Helmet 0.00 kipsSkin Quake 0.100 inToe Quake 0.083 inSkin Damping 0.200 sec/ftToe Damping 0.150 sec/ft100102.20Pile LengthPile PenetrationPile Top Area60.0055.0012.40ftftin2500109.6Pile ModelSkin FrictionDistribution4008300240200641002000 20 40 60 80 100 120Blow Count (bl/ft)Res. Shaft = 100 %(Proportional)Figure 2.14: Sample output of WEAP bearing graph analysis