Hollow structural sections (HSS/RHS/SHS) have advantages over open sections (I-beams) in COMPRESSION because:
Choose the correct answer
They are always lighter
They have equal moments of inertia in all directions, avoiding weak axis buckling
They never buckle
They are easier to fabricate
Correct Answer
B. They have equal moments of inertia in all directions, avoiding weak axis buckling
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HSS (square or circular) have similar radii of gyration about all axes, so their capacity is not limited by weak-axis buckling. Open I-sections have much smaller r_y (weak axis), making them vulnerable to weak-axis buckling.
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