a$)$ Determine the maximum design shear strength $(V^{**})$ of a flexural member $610$UB$125$ with Grade $300,$ shown in Fig. $5,$ spanning $12\mathrm{.}0$ m $.$

$d=612mm$

$b_f=229mm$

$t_f=19\mathrm{.}6mm$

$t_w=11\mathrm{.}9mm$

$A_g=16000m{m}^2$

$I_x=986**{10}^{6}m{m}^4$

$Z_x={3230}^{**}{10}^{3}m{m}^3$

$S_x=3680**{10}^{3}m{m}^3$

Fig. $5$ Section properties of $610$ UB$125$

b$)$ Determine the maximum design shear strength $(V^{**})$ of the $610$UB$125$ in Question $4-$a if the beam has intermediate transverse web stiffeners spaced at $900$ mm $.$