Structural analysis terminology: Redundant vs. perfect frames A redundant frame is also called which type of frame in classical truss/frame classification? Choose the correct description.
Mechanical Engineering
Engineering Mechanics
Difficulty: Easy
Choose an option
-
Aperfect
-
Bimperfect
-
Cdeficient
Answer
Correct Answer: imperfect
Explanation
ConceptFor a planar pin-jointed truss/frame with j joints and m members, a perfect frame satisfies m = 2j − 3. If m > 2j − 3, the frame has extra members (statically indeterminate) and is termed redundant. If m < 2j − 3, it is deficient.
ClassificationBoth redundant and deficient frames are grouped as imperfect (i.e., not perfect).
Final Answerimperfect