The 'section classification' of steel sections in IS 800 (plastic/compact/semi-compact/slender) depends on:
Choose the correct answer
Material yield strength only
b/t ratios of compression elements relative to ε = √(250/fy) — governs whether plastic, compact, semi-compact, or slender
Only member length
Connection type (welded vs bolted)
Correct Answer
B. b/t ratios of compression elements relative to ε = √(250/fy) — governs whether plastic, compact, semi-compact, or slender
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IS 800 Table 2: section class depends on b/t ratios of compression elements (flanges, webs). Plastic (Class 1): can form plastic hinges with full rotation capacity (b/t ≤ 8.4ε, ε = √(250/fy)). Compact (Class 2): attain Mp but limited rotation. Semi-compact (Class 3): elastic moment only (Me). Slender (Class 4): local buckling before yield — effective section needed. Classification determines design method.
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