Situation $7$: A rectangular beam is made using

$f{c}^{\text{'}}=21$MPa,$fy=420$MPa,$b=250mm,h=$

$500mm,$ and $3-25mm$ bars. Use $65mm$ for

the effective cover of the reinforcement.

Determine the following.

Depth of compression block $($mm$).$

a$.125\mathrm{.}27$

c$.138\mathrm{.}60$

b$.169\mathrm{.}17$

d$.145\mathrm{.}53$

$22.$Nominal moment capacity $($kN$-$m$).$

a$.224\mathrm{.}04$

c$.226\mathrm{.}19$

b$.199\mathrm{.}71$

d$.203\mathrm{.}57$

Ultimate moment capacity $(kN-m$

a$.224\mathrm{.}04$

c$.226\mathrm{.}19$

b$.199\mathrm{.}71$

d$.203\mathrm{.}57$

Required tension steel area for balance

condition $($mm$2).$

a$.2311$

c$.1473$

b$.1963$

d$.1651$