GATE CE 2026 Set 2 — Question 15
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Structural Engineering → Steel Member Design → Design of Beams
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Question
As per IS:800-2007, design of a cantilever steel beam section for its moment capacity requires fulfilment of an upper bound, expressed as:The reason for such upper bound is to
Correct answer
(C) avoid plastic deformation under working load
Solution
According to IS 800:2007 Clause 8.2.1.2, for sections with high shape factors (like solid circular or rectangular sections), the plastic moment capacity can be significantly higher than the yield moment. To prevent excessive plastic deformation at serviceability (working) loads, the design moment capacity is limited to for simply supported beams and for cantilever beams.
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