# FAQ 002110 EN

12 November 2019

002110

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 Iy according to the article "Bemessung von Wabenträgern" by R. Kindmann, H. J. Niebuhr, H. Schweppe.

The reduced moment of inertia Iy for WAB HEB 340‑340, for example, is calculated as follows:

red Iy = 0.8 * A * ((H - tg) / 2)2

red Iy = 0.8 * 150.50 * ((51.00 - 2.15) / 2)2 = 71,828 cm4

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• Updated 5 April 2021

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