Problem $1(10$ points$)$: The floor system of a building consists of a $20-cm-$thick reinforced

concrete slab resting on four steel floor beams, which in turn are supported by two steel girders,

as shown in Figure $1.$ The cross$-$sectional areas of the floor beams and the girders are $100c{m}^2$

and $400c{m}^2,$ respectively. Determine the dead loads acting on the beams CH and EG and the

girder AE$.$

Figure $1$: floor plan