The same hot$-$finished rectangular hollow section $($RHS$)$ in S$355$ steel with h $=400$ mm$,$ b $=300$ mm and t $=10$ mm is subjected to Combined Axial Compression and Major Axis Bending.

What is the maximum axial compression that can be applied on the section such that local buckling does NOT occur in the cross$-$section?

Based on hand calculation, what is the maximum value for the stress ratio $\backslash$psi $($psi$)$ such that local buckling does NOT occur for this cross$-$section?

A$.$between $-1$ and $-0\mathrm{.}75$ B$.$between $-0\mathrm{.}749$ and $-0\mathrm{.}5$ C$.$between $-0\mathrm{.}499$ and $-0\mathrm{.}250$ D$.$between $-0\mathrm{.}249$ and $0\mathrm{.}00$ E$.$ between $-0\mathrm{.}001$ and $-0\mathrm{.}250$ F$.$between $-0\mathrm{.}251$ and $0\mathrm{.}500$ G$.$between $0\mathrm{.}501$ and $0\mathrm{.}750$ H$.$between $0\mathrm{.}751$ and $1\mathrm{.}00$

Based on hand calculation, what is the maximum axial compression $($in kN$)$ that can be applied on the section such that local buckling does NOT occur under combined axial compression and major axis bending?

A$.$ between $0$ and $500$ B$.$between $501$ and $1000$ C$.$between $1001$ and $1500$ D$.$between $1501$ and $2000$ E$.$between $2001$ and $2500$ F$.$between $2501$ and $3000$ G$.$between $3001$ and $3500$ H$.$between $3501$ and $4000$ I.between $4001$ and $4500$ J$.$between $4501$ and $5000$