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Which of the following statement is true?

(a) combined mechanism is combination of elementary mechanism

(b) elementary mechanism is combination of combined mechanism

(c) combined mechanism is not combination of elementary mechanism

(d) elementary mechanism is combination of elementary and combined mechanism

I got this question during an interview.

My question is based upon Plastic Design of Portal Frames, Effect of Axial and Shear force on Plastic Moment Capacity topic in section Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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The correct option is (a) combined mechanism is combination of elementary mechanism

To explain I would say: The possible mechanisms can be classified into two types : elementary and combined mechanism. Elementary mechanism is independent of each other, combined mechanism is linear combination of elementary mechanisms.

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