The 'corbel' in RC construction is designed for:
Choose the correct answer
Bending only (same as beam design)
Strut-and-tie action — diagonal concrete strut + horizontal tension tie at top; a/d ≤ 1 governs design method
Column buckling
Punching shear at column head
Correct Answer
B. Strut-and-tie action — diagonal concrete strut + horizontal tension tie at top; a/d ≤ 1 governs design method
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Corbel (short bracket): a/d ≤ 1 (shear span to depth). Failure mode: diagonal tension / strut-and-tie. Design by IS 456 Cl. 17 / strut-and-tie method: main tension tie (Ast at top), strut in concrete, friction horizontal force (from beam bearing = 0.2V horizontal force on corbel). Main reinforcement: horizontal (primary), plus vertical stirrups. Very different from beam design (very short span).
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