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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.

Difficulty: Easy

perfect
imperfect
deficient

Correct Answer: imperfect

Explanation:

Concept
For 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.

Classification
Both redundant and deficient frames are grouped as imperfect (i.e., not perfect).

Final Answer
imperfect

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