Parametric Study - Cases Case 1: The pile is driven using a constant hammer stroke analysis such that the following capacities are attained at 240 blows/ft refusal: a) AgFy, representing twice the AASHTO LRFD design capacity for severe driving conditions; that is: 2 x 0.5AgFy;
b) 0.66AgFy, representing twice the current DM-4 design capacity for severe driving conditions; that is: 2 x 0.33AgFy; c) 0.50AgFy, representing twice the DM-4 design capacity prior to 2013 when Fy was specified to be 36 ksi; that is: 2 x 0.35Ag(36 ksi) = 25.2 ksi ≈ 0.5Ag(50 ksi).