$5\mathrm{.}1\mathrm{.}9207911$

Determine the bending stress at beam section $1\mathrm{.}83m$ from $A,$ for the beam loaded in Figure $5\mathrm{.}1$c$1($b$),$ at

beam height of $189mm$ from $x-$axis of the cross section shown in Figure $5\mathrm{.}1$c$1($a$),(\{$:${}_{189.x}=1\mathrm{.}83),$

in $\frac{N}{m}{m}^2.$

Given $D=270mm,B_f=212mm,t_w=30mm,t_f=30mm,a=3\mathrm{.}66m,b=0\mathrm{.}66m$ and $P_1=20kN.$

$($Hint: You are required to calculate the second moment of area with respect to its centroidal $x^{\text{'}}-$axis$)$

$($Note: Use negative sign $"-"$ to denote compressive stresses$)$

Figure $5\mathrm{.}1$c$1($a$)$