The cross$-$section shown below is subject to a negative internal bending moment $M=115kNm$ applied about the local z$-$axis of

the section. The top flange has a width $b=380mm$ and a thickness $t=15mm,$ the vertical webs each have a thickness $a=10$

$mm,$ and the total section has a height $h=130mm.$

In your working express your centroidal location to the nearest tenth of a millimetre and express the second moment of area for

the cross$-$section to the nearest millimetre.

b

I

Determine the maximum tensile normal stress in the cross$-$section due to the internal moment. Report your answer in units of

MPa with one decimal place of accuracy.

Determine the maximum compressive normal stress in the cross$-$section due to the internal moment. Report your answer in

units of MPa with one decimal place of accuracy.