Situation $2.$ Refer to the figure. A rectangular beam is reinforced with $4-28mm$ diameter

tension bars and $10mm$ diameter stirrups. The beam has a total depth of $600mm.f{c}^{\text{'}}=21$

$MP,fy=420$MPa and fyt $=280$MPa. Clear concrete cover is $40mm.$ Specified maximum

aggregate size in the mixture is $20mm.$ Use $U=1\mathrm{.}2D+1\mathrm{.}6L.$ Use $=0\mathrm{.}75$ for shear and

$=0\mathrm{.}90$ for bending.

Determine the minimum width $(mm)$ of the beam that will be adequate to carry a factored

bending moment $$ of $420kN-m,$ without needing the compression bars.

A$.290mm$

C$.350mm$

B$.300mm$

D$.340mm$

Determine the minimum width $(mm)$ of the beam that will be adequate to carry a factored

shear Vu of $275kN,$ if stirrups are spaced at $100mm.$

A$.375mm$

C$.300mm$

B$.325mm$

D$.275mm$

Determine the minimum width $(mm)$ of the beam that will be adequate to comply with clear spacing and minimum cover requirements.

A$.287mm$

C$.296mm$

B$.324mm$

D$.)268mm$