•Trusses
–Designed to support loads
–Consist entirely of two-force members
•Frames
–Designed to support loads
–Include one or more multi-force members
•Machines
–Designed to transmit and/or modify forces
–Include one or more multi-force members
Two-Force
Members:-
- Pinned at both ends (both joints)
- No applied forces between joints
- No applied moments
- Line of action of forces is directed along a line drawn between the two joints
