What are the different methods of
analyzing (or finding out the forces) a
perfect frame? Which one is used where
and why?
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Answer:
Following are the assumptions made in finding the forces in the members of a frame.
The frame is a perfect frame
The frame is loaded only at the joints
All the members of the frame are pin-jointed
Self-weight of the members is neglected.
Forces in various members of a perfect frame may be found out either by analytical method or graphical method. Here, the discussion is confined to only analytical method.
A perfect frame can be analytically analyzed by the following methods:
Method of joints or method of resolution
Method of sections or method of moments
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