FAQ 002110 EN

Results RFEM RSTAB 5.xx 8.xx

How RFEM and RSTAB calculate the moment of inertia ly of a castellated beam from the library?


RFEM and RSTAB calculate a reduced moment of inertia ly according to the article "Design of Castellated Beams" by Rolf Kindmann, H. J. Nieburh, H. Schweppe.

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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