For RCC slabs spanning in two directions, the ............. of the two spans should be used for calculating the span to effective depth ratios, as per the code IS-456.

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9)  For RCC slabs spanning in two directions, the ............. of the two spans should be used for calculating the span to effective depth ratios, as per the code IS-456.



ans - the smaller span




Concept:-

As per IS-456:2000 (Indian Standard Code of Practice for Plain and Reinforced Concrete), for RCC slabs spanning in two directions, the smaller span of the two spans should be used for calculating the span-to-effective depth ratio (l/d).

This is mentioned in Clause 23.2.3 of IS-456. The smaller span is considered to control the deflection, as deflection is generally governed by the shorter span in two-way spanning slabs.

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