Truss structure is designed to support huge loads in comparison to its weight. In a truss, the joints are of pin type and consists of 2 force members (tensile and compression - axial forces). Here the the members are free to rotate about the pin.


A frame is a structure in which at least one of its individual member is a multi-force member.
The members of frames are connected rigidly at joints by means of welding and bolting. The joints can transfer moments in addition to the axial loads.
In a plane frame all the moments are perpendicular to a single plane
Frames can be of 2 types - rigid noncollapsible and nonrigid collapsible frames.