The 'two-way slab' design (IS 456) uses which table for sagging moments in the two directions?
Choose the correct answer
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
Why is this the answer?
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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