SITUATION $15-$ Given:

Beam section, $bh=300mm480mm$

Effective depth, $d=410mm$

Cover of compression bar measure to centroid $=65mm$

Concrete conpressive strength, $f_i^{\text{'}}=30$MPa

Steel yield strength. $f_y=415$MPa

$U=1\mathrm{.}20+1\mathrm{.}6t$

The beam is simply supported on a span of $6m,$ and carries the following loads:

Superimposed dead load $=18k\frac{N}{m}$

Live load $=20k\frac{N}{m}$

$39.$ What is the maximum moment, $M_4(kN-m),$ at ultimate condition?

A$.241$

C$.287$

i$.224$

D$.260$