Design Curve of Steel

Q. 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

1. $0.002$
2. $\frac{f_{cu}}{100}$
3. $0.0035$
4. $\frac{f_y}{1.15E_s}+0.002$

Q. 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

1. $0.002$
2. $\frac{f_{cu}}{100}$
3. $0.0035$
4. $\frac{f_y}{1.15E_s}+0.002$