Question

If $f_{cu}$ and$f_y$ are cube compressive strength of concrete and yield stress of steel respectively and $E_s$ is the modulus of elasticity of steel for all grades of concrete, the ultimate flexural strain in concrete can be taken as

• A. $0.002$
• B. $\frac{f_{cu}}{100}$
• C. $0.0035$
• D. $\frac{f_y}{1.15E_s}+0.002$

Answer 1

The correct option is C $0.0035$

The strain in steel shall not be less than $\frac{f_y}{1.15E_s}+0.002$ to ensure ductility and ultimate flexural strain in concrete is 0.0035.