Analyse the rigid$-$jointed frame illustrated below using the matrix stiffness method. Find the moments, shears, and axial forces at the ends of the beams. EI is $1000$kN$.$m$2$ and EA is $25000$ kN for the beams, and EI is $1500$kN$.$m$2$ and EA is $35000$kN for the columns. a $=3$ m$,$ b $=5$ m$,$ and c $=4$ m$.$ w$1=13$kN$/$m$,$ and w$2=9$kN$/$m$.$