The 'deep beam' per IS 456 has span-to-depth ratio:
Choose the correct answer
L/D > 10
L/D ≤ 2 (simply supported) or ≤ 2.5 (continuous) — plane sections assumption invalid, design by STM
L/D between 5 and 10
Any beam with T-section
Correct Answer
B. L/D ≤ 2 (simply supported) or ≤ 2.5 (continuous) — plane sections assumption invalid, design by STM
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IS 456 Cl. 29 (deep beams): simply supported span L ≤ 2D (overall depth D); continuous span L ≤ 2.5D. Design by: STM (strut-and-tie model) or design charts (Cl. 29.2). Main reinforcement: distributed vertically and horizontally (not concentrated at bottom only). Standard beam theory invalid — plane sections don''t remain plane. Deep beams: transfer beams in high-rise, pile caps, walls with openings.
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