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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 mechanismI 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

Answer» 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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