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Which of the following relation about plastic moment is correct?(a) Mp = Zp /fy(b) Mp = Zp + fy(c) Mp = Zpfy(d) Mp = Zp – fyThe question was posed to me during an interview.The origin of the question is Plastic Theory in portion Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures |
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Answer» CORRECT choice is (c) Mp = Zpfy The BEST I can explain: When every fibre of the section has a STRAIN equal to or greater than εy=fy/Es , NOMINAL moment strength is referred as plastic moment and is given by Mp = Zpfy , where Zp = ∫ydA is plastic section modulus and fy = yield STRESS. |
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