The Section Property You Stopped Computing
A 4″ STD pipe stub is welded on as a dummy leg. Someone suggests using a solid round bar of exactly the same weight per metre instead — same steel, same kilograms, no pipe in the store.
Guess first: how much bending capacity do you lose?
Most people say "a bit". The pipe carries 4 times the bending moment and is 9 times stiffer. Same grade, same mass, same cost per metre. Nothing about the material changed — every bit of that factor of nine is where the metal is standing.
You know this. You proved it in second year…
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