In a 'flat slab' (IS 456), the design bending moment at the column strip near support is:
Choose the correct answer
Full M0 acts only at midspan
75% of 0.65×M0 (negative moment) → column strip negative = 0.49×M0 for interior supports
Zero moment at column face
The same as a simply supported slab
Correct Answer
B. 75% of 0.65×M0 (negative moment) → column strip negative = 0.49×M0 for interior supports
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IS 456 Cl. 31.5 (Direct Design Method): total static moment M0 = wu×L2×Ln²/8 (L2=panel width, Ln=clear span). Distributed: Negative moment = 0.65 M0; Positive = 0.35 M0 (for interior spans). Column strip gets 75% of negative moment, 60% of positive. Middle strip gets remainder. Edge beams and column alignment affect distribution. Punching shear critical at column.
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