Input
Results
θ = atan(D/s)—
Group efficiency η—
Sum × η (group ult.)—
Block capacity (cohesive)—
Governing—
Method
Converse-Labarre: η = 1 − [(m−1)n + (n−1)m]·θ/(90·m·n) where θ in degrees. Feld: each interior pile loses 1/16 per neighbor. Seiler-Keeney: η = 1 − (11s/(7(s²−1)))·((m+n−2)/(m+n−1)) + 0.3/(m+n) for s in feet. Block (cohesive): Qb = 2(B+L)·D·c̄ + Bb·Lb·9·c (perimeter shear + base bearing). Governing = min(Σ Qsingle·η, Qblock).