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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 |
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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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