The following notation is used in this chapter:
amax = peak ground acceleration
B = width of the footing (Secs. 6.1, 6.2, and 6.5)
B = width of the pile (Sec. 6.3)
B = width of the pile group measured to the outside edge of the perimeter piles (for downdrag
load)
B′ = reduced footing width to account for eccentricity of load
c = cohesion based on a total stress analysis
c′ = cohesion based on an effective stress analysis
cA = adhesion between the cohesive soil and the pile or pier perimeter
c1, c2 = cohesion based on a total stress analysis (two soil layers)
D = depth of the pile group
D = diameter of the pile (Sec. 6.4)
Df = depth below ground surface to the bottom of the footing
Dr = relative density
e = eccentricity of the vertical load Q