Bolt Prying Action Calculator
Checks a tee-type bolted tension connection for prying action. From the bolt layout, flange geometry and factored load it finds the flange thickness needed to limit prying and the thickness to ignore it, then checks the connection capacity, the bolt tension including prying, and the web.
By Arun Kishore, P.Eng. Updated
Open calculatoropens in a new tabCode references
- CSA S16 Cl. 13.12.1.3: bolt tensile resistance, shared with the Bolt Capacity tool
Inputs and outputs
| Inputs | Bolt tensile strength Fub (MPa) and diameter d (mm) |
|---|---|
| Number of bolts, n | |
| Bolt gauge g and pitch p (mm) | |
| Web thickness, w (mm) | |
| Flange width b0 and thickness t (mm) | |
| Length of the member, L (mm) | |
| Member yield strength, Fy (MPa) | |
| Factored axial load, Pf (kN) | |
| Outputs | Minimum flange thickness, and minimum thickness to disregard prying |
| Bolt tensile resistance | |
| Connection capacity and utilization | |
| Bolt force including prying, and bolt utilization | |
| Web capacity and utilization |
Worked example
Worked example coming soon.
Limitations and assumptions
- φ = 0.9 for the flange and web. The bolt hole is taken as d + 2 mm.
- The web check is yielding of the gross web over the member length, φ L w Fy.
- The app does not cite a code clause for the prying model itself.
These calculators are aids, not a substitute for engineering judgment. Check results independently and against the governing code edition before relying on them.