Zero-Force Members Revealed
Here are the answers for the zero-force member question from here. Zero-Force members are highlighted in green.
AB - summing the vertical forces at joint B reveals AB to be zero.
EF - CE and EH are parallel and there are no external forces at joint E (Rule 1).
EH - Joint H has only two members and no external force, both members are zero force (Rule 2).
FH - See EH.
CE - Re-analyzing joint C, after knowing that EH is zero, reveals this member is zero.
Please comment if anything is amiss or you need more clarification, I will gladly respond!