Find out ultimate moment of resistance of doubly reinforced rectangular section of size $250 \ mm \ {\times} \ 550 mm$ (effective) having tensile reinforcement $(3054 \ mm^2 )$ and compressive reinforcement $(982 \ mm^2 )$

The material are $M_{20}$ concrete and TOR steal.

Refer Table 1 for the values of $F_{sc}$ for various $\frac{d_c}{d}$ ratio.

Data :- $b=250 \ mm \\ D=550 \ mm$

$Ast=3054 \ mm^2 \\ Asc=982 \ mm^2 \\ f_ck=20 N/mm^2 \\ TOR \ steal =F_{e415} \\ i.e f_y=415N/mm^2 \\ Assume \ d_c=40 mm$

Now,

$\frac{d_c}{d}=\frac{40}{550}=0.072$