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| In structural engineering, the '''plastic moment''' (Mp) is a property of a structural section. It is defined as the moment at which the entire cross section has reached its yield stress. This is theoretically the maximum bending moment that the section can resist - when this point is reached a [[plastic hinge]] is formed and any load beyond this point will result in theoretically infinite plastic deformation. In practice most materials work harden resulting in increased stiffness and moment resistance until the material fails. This is of little significance in [[structural mechanics]] as the deflection prior to this occurring is considered to be an earlier failure point in the member.
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| Mp for a rectangular section can be calculated with the following formula:
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| <math>M_p= (bd^2 / 4 )\sigma_y</math> | |
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| For other sections it is normal to calculate <math>Z_P</math> then substitute it into the formula as follows:
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| <math>M_p=\sigma Z_p</math>
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| The plastic moment for a given section will always be larger than the yield moment (the bending moment at which the first part of the sections reaches the yield stress)
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| ==See also==
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| *[[Structural engineering theory]]
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| [[Category:Building engineering]]
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Latest revision as of 02:30, 16 September 2014
Nice to satisfy you, I am Marvella Shryock. The thing she adores most is body building and now she is trying to make cash with it. Puerto Rico is where he and his spouse live. For many years I've been working as a payroll clerk.
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