Parametric Study - Example HP12x74 [L = 50 ft; SF = 0.20; TD = 0.10 s/ft; TQ = 0.05 in.; SD = 0.015 s/ft; SQ = 0.10 in.]
Case
1a 1b 1c 2a 2b 3 4
Hammer
ICE 1-36v2 Pileco D19-42 ICE 1-12v2 ICE 1-36v2 Pileco D19-42 ICE 1-36v2 ICE 1-36v2
Pile capacity at 240 blows/ft (787 blows/m) refusal 1/AsFy 1.00 0.66 0.50 0.73 0.70 0.66 0.43
ksi 50.0 33.0 25.0 36.5 35.0 33.0 21.6
kips 1090 719 545 800 763 719 466
Driving stress at refusal ksi 62.0 39.0 30.8 44.8 41.5 39.5 25.2
Stroke at refusal
Energy at refusal
ft 11.81 9.75 8.66 8.20 10.60 7.11 4.90
kip-ft 52.0 23.6 12.9 29.9 26.5 23.4 11.3
The AASHTO-permitted capacity of the HP12x74, corresponding to a capacity at refusal of AgFy, cannot be reached without significantly exceeding the driving stress limit of 0.9Fy = 45 ksi