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How RFEM and RSTAB calculate the moment of inertia ly of a castellated beam from the library?
The reduced moment of inertia ly, for example for WAB HEB 340‑340, is calculated as follows:
red ly = 0.8 * A * ((H - tg) / 2)2
red ly = 0.8 * 150.50 * ((51.00 - 2.15) / 2)2 = 71.828 cm4
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