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!