Problem $2$

Determine the internal forces at the given three cross$-$sections: $E,D_L$ and $D_R$ as shown.

Draw free body diagrams for all your calculation;

Find reactions at the supports;

Calculate the internal forces.

Partial Ans: $By=\frac{852}{13}lb($up$),M_E=167\mathrm{.}9l{b}^{\text{'}}(+),V_{DL}=5\mathrm{.}54lb|-|$