'Cold-formed steel' sections compared to hot-rolled (IS 811) have advantages in:
Choose the correct answer
Very thick walls and high self-weight
Custom cross-section shapes, high stiffness-to-weight ratio, pre-galvanized, and punched holes for services — using thin sheets
Better for very heavy structural applications > 50t columns
No advantage over hot-rolled in any application
Correct Answer
B. Custom cross-section shapes, high stiffness-to-weight ratio, pre-galvanized, and punched holes for services — using thin sheets
Why is this the answer?
Cold-formed sections: manufactured by bending (roll-forming/press-braking) thin sheets (0.5–8 mm) at room temperature. Advantages: (1) Wide variety of custom cross-sections; (2) Thin walls → high section modulus/weight ratio; (3) Galvanized (corrosion-resistant); (4) Pre-punched service holes; (5) Light weight (easier erection). Disadvantages: local buckling (thin walls), b/t limits in IS 811, susceptible to distortional buckling. Used in: purlins, girts, light steel framing.
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