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2019-11-12

Calculation of Reduced Moment of Inertia Iy for Castellated Beams

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

Answer:

RFEM and RSTAB calculate a reduced moment of inertia Iy according to the article "Bemessung von Wabenträgern" by R. Kindmann, H. J. Niebuhr, and H. Schweppe.

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

red I = 0.8 · A · h - tg22
red I = 0.8 · 150.50 · 51 - 2.1522 = 71.8284
Moment of Inertia of Castellated Beam

WAB HEB 340-340
WAB HEB 340-340
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