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Which of the following is true? (a)ultimate load is reached when a mechanism is formed

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in Design of Steel Structures by (962k points)
Which of the following is true?

(a) ultimate load is reached when a mechanism is formed

(b) ultimate load is not reached when a mechanism is formed

(c) plastic hinges are not required for beam to form a mechanism

(d) frictionless hinges are not required for beam to form a mechanism

I got this question in unit test.

My question is from Conditions of Plastic Analysis topic in chapter Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

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Correct answer is (a) ultimate load is reached when a mechanism is formed

Explanation: There must be sufficient number of plastic and frictionless hinges for the beam/structure to form a mechanism. The ultimate load is reached when a mechanism is formed.

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