$7\mathrm{.}5$ Resultant Internal Loadings $(2-$D$)$

Determine the resultant internal loadings

on the cross section through point $D.$

Assume the reactions at the supports $A$

and $B$ are vertical.

Hint $1$: This problem is just $2-$D$,$ so you get only THREE internal resultant unknowns $(V,N$

and M$)$ at the cross$-$section "slice".

Hint $2$: I don't want you to mess up the "Step $1"($old statics$)$ step before you even get to the

new material, so check that you calculated $A_y=7\mathrm{.}5kN,$ or $B_y=3kN.$