Problem $1.(15$ points$)$

Galculate the internal loads $($axial load, shear load and bending moment$)$ acting on the bar $1-2-3$ and the axial rod $2-4$ in the co$-$planer frame system shown in Fig$\mathrm{.}1.$ Plot the internal load distributions on each member in the structural system. $P=2000kg$ and $=15.$

Fig. $1$ Structural system of Proble