The expression for additional tension reinforcement in a doubly reinforced beam is given by:
1
\(A_{st2}=\frac{1.15 fy}{Asc * fsc}\)
2
\(A_{st2}=\frac{0.87 fy}{Asc * (fsc-fcc)}\)
3
\(A_{st2}=\frac{Asc * (fsc-fcc)}{fy}\)
4
\(A_{st2}=\frac{Asc * (fsc-fcc)}{0.87fy}\)