Steel · Connections: bolts & welds

Bolt in combined tension & shear (with prying) calculator

Bolt tension capacity, prying allowance and the elliptical shear–tension interaction.

Standard: AS 4100 Cl 9.3.2.2, 9.3.2.3

Inputs in the worked example

The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.

Diagram for the worked example

Bolt diameter df = CHOOSE(3,12,16,20,24,30,36) = 20 mm
Bolt tensile strength fuf = IF(2=1,400,830) = 830 MPa
Tensile stress area As = CHOOSE(3,84.3,157,245,353,561,817) = 245 mm²
Core area Ac (threads) = CHOOSE(3,76.2,144,225,324,519,759) = 225 mm²
Shank area Ao = CHOOSE(3,113,201,314,452,707,1018) = 314 mm²
Bolt tension incl. prying = 80*(1+20/100) = 96 kN
φNtf = 0.8 As fuf = 0.8*245*830/1000 = 162.68 kN
φVf (single plane) = 0.8*0.62*830*IF(1=1,225,314)/1000 = 92.628 kN
Interaction (V/φVf)² + (N/φNtf)² = (30/92.628)^2+(96/162.68)^2 = 0.45313
Limit = 1 = 1

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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.