The 'T-beam' effective flange width for interior beam (IS 456) is taken as:
Choose the correct answer
Full slab width always
Minimum of (lo/6 + bw + 6Df), (slab panel width + bw), and actual beam spacing per IS 456 Cl. 23.1.2
bw only (web width)
10 times slab thickness + web width
Correct Answer
B. Minimum of (lo/6 + bw + 6Df), (slab panel width + bw), and actual beam spacing per IS 456 Cl. 23.1.2
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IS 456 Cl. 23.1.2: Effective flange width of T-beam = min of: (1) lo/6 + bw + 6Df (lo = distance between zero-moment points ≈ 0.7×effective span); (2) Actual width of slab panel on each side + bw; (3) Actual spacing between beams. For L-beam: effective flange = lo/12 + bw + 3Df or panel/2 + bw whichever is less. Width governs NA position and moment capacity.
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