which member is very strong (strength) after the cross-
section area is same, pipe section or solid rod section ?
no that's not my question, my question is why pipe section
is strong ?

Answer Posted / raghuram

HALLOW SECTIONS ie, PIPES OR ANT OTHER ARE STRONGER BECAUSE
THEY HAVE HIGHER Z(SECTION MODULUS) COMPARED TO SOLID
SECTIONS. Z=I/Y............................

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