The 'direct method' of design of two-way slabs (IS 456) is applicable when:
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Any slab regardless of aspect ratio or loading
Ly/Lx ≤ 2 and UDL — IS 456 Annex D coefficients give moments in both directions
Only for cantilever slabs
PSC slabs only
Correct Answer
B. Ly/Lx ≤ 2 and UDL — IS 456 Annex D coefficients give moments in both directions
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IS 456 Annex D (Restrained Two-way Slab): provides bending moment coefficients αx, αy for various support conditions and Ly/Lx ratios. Conditions: (1) Ratio Ly/Lx ≤ 2; (2) Loads are uniformly distributed; (3) Deflection must be compatible at common support (monolithic). Method gives total mid-span and edge moments per unit width. For Ly/Lx > 2: acts as one-way slab.
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