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GATE 2026 AR — Architecture – Question 60

Building Construction, Materials, and Structural Systems · Design with steel and RCC · 2 marks · Multiple select

Which statements about steel construction are correct?

  1. Weathering steel develops a rust-like exposed layer.
  2. Intumescent coatings improve passive fire protection.
  3. At equal weight an ordinary I-beam has greater flexural capacity than a castellated beam.
  4. Outrigger systems can add torsional rigidity against lateral loads in tall structures.

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Show answer and explanation

Correct answer: (A) Weathering steel develops a rust-like exposed layer.; (B) Intumescent coatings improve passive fire protection.; (D) Outrigger systems can add torsional rigidity against lateral loads in tall structures.

Explanation

Weathering steel develops a protective oxide patina(A). Intumescent coatings expand under heat to insulate steel(B). Castellating can increase section depth and bending efficiency at similar weight, so C’s blanket comparison is wrong. Properly configured outriggers engage perimeter columns and can improve lateral/torsional stiffness(D). Select A, B, D; detailed member checks still depend on section and loading.

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