The 'net area' for a tension member with bolt holes (IS 800) is:
Choose the correct answer
Gross area without any deductions
Gross area minus hole areas (bolt dia + 2 mm clearance × plate thickness); staggered path uses s²/4g correction
Half the gross area always
Area at the root of thread for bolts
Correct Answer
B. Gross area minus hole areas (bolt dia + 2 mm clearance × plate thickness); staggered path uses s²/4g correction
AI Detailed Explanation & IS Code Reference
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Net area = gross area − area of holes. Hole diameter = nominal bolt dia + 2 mm (clearance) per IS 800. For staggered holes: net width = gross width − Σ(hole widths along path) + Σ(s²/4g) (s=stagger pitch, g=gauge). IS 800: design tensile capacity Tdg = 0.9Anfy/γm0 (yielding of gross section) or 0.9Anfuγm1 (rupture of net section) — minimum governs.
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