Slip-Critical Bolt with Applied Tension (AISC 360 J3.9)
What steel-bolt-slip-critical's note calls a separate check. Applied tension relieves the clamping force the joint runs on, so slip resistance falls by ksc = 1 - Tu/(Du Tb nb). Four 3/4-in A325 on Class A with 30 kip of tension lose 23.7% - 37.97 kip LRFD down to 28.97. Past Du Tb nb the factor hits zero and there is no slip resistance left at all. Slip is serviceability: the J3.7 rupture check and bolt shear/bearing are separate and can pass or fail independently.
Formula and source
ksc = 1 - Tu/(Du Tb nb) (Eq. J3-5a, LRFD), floored at 0; reduced slip resistance = ksc x Rn where Rn = mu Du hf Tb ns; phi = 1.00, Omega = 1.50 for standard holes.
AISC 360 Section J3.9, slip-critical connections subject to combined tension and shear, by section number; the unreduced resistance comes from this catalog's landed slip-critical tile rather than being recomputed.
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