Web Reference: The plastic section modulus is calculated as the sum of the areas of the cross section on either side of the PNA, each multiplied by the distance from their respective local centroids to the PNA. As shown in Figure 5, y1 and y2 are the distance from the plastic centroid to the centroid of area A1 and A2, respectively. A/2 x (y1+y2) is called Z, the plastic section modulus of the cross-section. Values for Z are tabulated for various cross-sections in the properties section of the LRFD manual. φ Mp = 0.90 Z Fy - See Spec. F1.1 A simple spreadsheet is presented which can be used to calculate the plastic section modulus of structural members. It should be useful to design engineers, especially when there are many values to be calculated.
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