The 'two-way slab' design (IS 456) uses which table for sagging moments in the two directions?
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Table for flat slabs (column head dimensions)
IS 456 Table 26 (Annex D) — αx and αy moment coefficients varying with ly/lx and edge condition
Beam design table (rectangular section Mu/bd²)
Foundation settlement table
Correct Answer
B. IS 456 Table 26 (Annex D) — αx and αy moment coefficients varying with ly/lx and edge condition
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IS 456 Annex D (Table 26): simply supported or restrained two-way slabs — moment coefficients αx and αy for short span and long span directions. Conditions: restrained or not at edges. Moments: Mx = αx × w × lx² (short span); My = αy × w × lx² (long span). Coefficients from Table 26 vary with (ly/lx) ratio (1.0 to 2.0). Edge condition (continuous/discontinuous) affects coefficients. Restrained slabs develop torsional steel at discontinuous corners.
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