Task $6$: Use Australian Standards AS $3600$ and relative code to design ultimate strength theory for bending usingTask $6$: Use Australian Standards AS $3600$ and relative code to design ultimate strength theory for bending using rectangular stress block with first principles.

$\frac{O}{?}=0\mathrm{.}8,f_{sy}=500$MPa

$M^{**}=\frac{O}{M_{uo}}=\frac{O}{A_{st}{f}_{sy}d[1-\frac{0\mathrm{.}6A_{st}{f}_{sy}}{bd{f}^{\text{'}}c}]}$

rectangular stress block with first principles