Question

Determine the adequacy of Bolt B when 20mm diameter A325 bolts are used with threaded excluded from the shear planes. Assume the strength of the column and the ST section does not govern. The value of F is 500kN, with a 60-degree angle from the horizontal. Bolts A F Bolts B

Answer 1

For ASTM A325= yield strength $= 92 ksi =634.318 N/mm^2$

Shear stress acting on bolts $F= 500 cos 60=250 kN$

$A=2 (\frac{\pi}{4}*20^2) =628.3 mm^2$

Shear stress due to load= $\frac{250000}{628.3}= 397.89 N/mm2$

Nominal strength for two bolts > shear stress acting on the bolts

$2* 634.318 N/mm ^2>397.89 N/mm^2$

$1268.636 N/mm^2 >397.89 N/mm^2$

Therefore bolts are adequate