The spacing of reinforcing bars in concrete is determined to ensure the required area of steel is provided within a given length. When replacing bars of a smaller diameter with larger diameter bars while maintaining the same reinforcement ratio, the spacing of the larger bars must increase. The calculation is based on equating the area of steel per unit length: $\frac{A_1}{S_1} = \frac{A_2}{S_2}$, where $A$ is the cross-sectional area of a single bar and $S$ is the spacing. For circular bars, $A \propto D^2$. Therefore, $S_2 = S_1 \times \frac{D_2^2} {D_1^2}$.
The main reinforcement of an RCC slab is designed for 10 mm diameter bars @100 mm spacing. Now it is required to replace 10 mm bars by 12 bars, then the spacing of 12 mm bars should be
Asked in Civil Engg GA 24 2023 CO 1505 2024 · Topic: Mechanics (Elasticity (Stress, Strain, Hooke's Law, Elastic Moduli))
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