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Vertical Compression Capacity of Single Shaft



Q_u = Q_Bu + Q_su - W_p

OR

Q_u = q_buA_b + Σ_{i=1to n} Q_sui - W_p

Where
Q_u = ultimate drilled shaft or pile resistance, kips
Q_bu = ultimate end bearing resistance, kips
Q_su = ultimate skin friction, kips
q_bu = unit ultimate end bearing resistance, ksf
A_b = area of tip or base, ft ²
n = number of increments the pile is divided for analysis (referred to as a pile element)
Q_sui = ultimate skin friction of pile element i, kips
W_p = pile weight, kips



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