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Design of One Way Slab

The main rein...

Question

The main reinforcement of a RC slab consists of 10 mm bars at 10 cm spacing. If it is desired to replace 10 mm bars by 12 mm bars, then the spacing of 12 mm bars should be

A

12cm

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B

14 cm

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C

14.40cm

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D

16 cm

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Solution

The correct option is C 14.40cm
The horizontal distance between parallel main reinforcement bars shall not be more than three times the effective depth of solid slab or 300 mm whichever is smaller. The total reinforcement in the slab should remain same. By replacing 10 mm bars by 12 mm bars, the spacing will increase as

${(\frac{d_{2}}{d_{1}})}^{2} \times S_{1} = {(\frac{12}{10})}^{2} \times 10 = 14.4 c m$

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