In IS 800, the 'block shear failure' of a bolted gusset plate occurs when:
Choose the correct answer
The plate buckles out of plane
A block of material tears out — combined shear along bolt line and tension perpendicular to bolt line
Welding fails
Bolts fail in tension only
Correct Answer
B. A block of material tears out — combined shear along bolt line and tension perpendicular to bolt line
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Block shear: a block of material separates from the member — shear failure along bolt line + tension failure perpendicular. Tdb (block shear) = min of: (Avg·fy/(√3·γm0) + 0.9·Atn·fu/γm1) or (0.9·Avn·fu/(√3·γm1) + Aty·fy/γm0) where Avg, Avn = gross/net shear area, Atn, Aty = net/gross tension area. Often governs for thick plates with few bolts.
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