In each of the load$-$tracing problems below, construct a series of FBDs and show the propagation of loads through the various structural elements.

Problem $4$

The live load on the floor system shown is $100$ psf$,$ and the dead load, including all structural elements, is $40$ psf$.$ There is a $10-$ft high masonry wall that bounds the opening from $A$ to $C$ to $D.$ The wall weighs $80lb.$ per square foot of elevation. Find the load distribution on members beam $B1,$ beamB$2$ and girder G$1($ACB$).$

B$1=12,600b$

$*$Please show how to solve for B$2$ and G$1$