Q$2.$ An existing monolithic beam & slab system has the following details:

Slab:

$h=80mm,b_{\text{e}\text{f}\text{f}}=1200mm$;

Beam: $,h=400mm$ overall $(320$mm down$-$stand$),b_w=400mm$;

Materials: $,A_s=7H25$ @ $d=340mm$;$f_{ck}=25\frac{N}{m}{m}^2.$

Working from first principles, determine the internal stress resultants and so the moment capacity of the T$-$beam. Set out a clear diagram of all forces & distances.