From the Floor Plan shown:

a$)$ Draw Free Body Diagram of beams B$1$ through B$4.$ Note that B$1,$ B$3,$ and B$4$ should be treated as continuous beams.

b$)$ Calculate maximum bending moment for B$2.$

Loads of the system are as follow:

$DL=500k\frac{g}{m^2}$

$LL=500k\frac{g}{m^2}$

Wall $(Outside$ perimeter $)=500k\frac{g}{m}$

Beam $($ Self Weight $)=300k\frac{g}{m}$