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Calculate The Bolt Slip Resistance in Slip Critical Connection:

Calculation:

Designer/Checker:

Input:

Metric Units

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)

AISC J3.8:

The following is for calculating the slip resistance of a bolt in a slip critical connection.

ASD

LRFD

Choose below, the hole filler factor where hf = 1.0 for no fillers, 1 filler or where bolts are added to distribute loads in the filler and hf = 0.85 for 2 or more fillers between connected parts.

hf = 1.0

hf = 0.85

Select the slip critical coefficient, u, below. Class A - unpainted clean mill scale steel surfaces or surfaces with Class A coatings on blast-cleaned steel and hot-dipped galvanized and roughened surfaces. Class B - unpainted blast-cleaned steel surfaces or surfaces with Class B coatings on blast-cleaned steel.

u = 0.30 - Class A Surface

u = 0.50 - Class B Surface

Choose hole condition below to adjust LRFD and ASD factors.

standard size and short slotted holes perpedicular to the load direction.

oversized and short-slotted holes parallel to the direction of the load.

long-slotted holes.

Number of slip planes (Ns)

Minimum fastener tension (Tb - kips or kN)

Note: Du = 1.13, ratio multiplier of mean installed bolt pretension to the specified minimum bolt pretension.

Output:

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Nominal slip resistance, Rn =

Slip resistance, Ru =

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