$($a$)$ Draw complete shear and moment diagrams using the relations among Load, shear Moment. Determine maximum shear $V_{\text{m}\text{a}\text{x}}$ and maximum bending moment $M_{\text{m}\text{a}\text{x}}$

$($b$)$ If the beam is a $W1876$ steel section, determine the maximum normal stress due to bending on a transverse section at point D $.$

$($Properties of W$18$x$76$: $I_x=1330i{n}^4,S_x=146i{n}^3,r_x=7\mathrm{.}73in,I_y=152i{n}^4,S_y=($:$27\mathrm{.}6i{n}^3,r_y=2\mathrm{.}61in$