GATE CE 2026 Set 1 — Question 29
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Structural Engineering → Slabs, Columns & Prestressed → Design of Slabs
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Question
The required centre-to-centre spacing of 10 mm diameter bars is 150 mm to resist the design moment in a concrete slab. Instead of 10 mm diameter bars, if 12 mm diameter bars of the same grade are used, the required centre-to-centre spacing (in mm) to resist the same design moment becomes ________ (rounded off to the nearest integer).
Correct answer
214 to 218
Solution
For a given design moment and same grade of steel, the required area of steel per unit width () is constant.Let mm, mm and mm, be the new spacing.Rounding off to the nearest integer, we get 216.
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