In IS 800, a compact section (Class 2) is one which:
Choose the correct answer
Buckles locally before reaching yield stress
Can reach yield moment capacity but has limited rotation capacity before local buckling
Has unlimited plastic rotation capacity
Fails by lateral torsional buckling
Correct Answer
B. Can reach yield moment capacity but has limited rotation capacity before local buckling
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IS 800 section classification: Class 1 (Plastic): can form plastic hinge with rotation capacity; b/t ≤ plastic limit. Class 2 (Compact): can reach yield moment but rotation before local buckling limited. Class 3 (Semi-compact): extreme fibre reaches fy but local buckling before full plasticity. Class 4 (Slender): local buckling before fy is reached.
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