A$=155$mm B$=160$mm C$=1100$mm D$=700$mm

QUESTION $1$:

For the sections shown above, calculate the following cross$-$sectional properties:

i$.$ Area,

ii$.$ Centroid,

iii. moment of inertia about the centroid.

QUESTION $2$:

If each of these sections is loaded with a moment of $150kN.m,$ find the stresses at the top and bottom fibers.

QUESTION $3$:

Find the moment that will cause cracking at the bottom fiber of each of these sections. Assume a cracking stress of $1\mathrm{.}5$MPa.