$12$ ft

A plane frame is restrained at joints A and $C$ as shown in the figure. Members

$AB$ and $BC$ are pin connected at $B.$ A triangularly distributed lateral load with

a peak intensity of $90l\frac{l}{f}t$ acts on AB $.$ A concentrated load moment is

applied at joint $C.$

$($a$)$ Find reactions at supports A and $C.$

$($b$)$ Find internal stress resultants $N,V,$ and M at $x=3$ ft on column AB $.$