FAQ 002110 EN-US






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


    Moment of inertia of castellated beam

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    RFEM Main Program
    RFEM 5.xx

    Main Program

    Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

    Price of First License
    3,540.00 USD
    RSTAB Main Program
    RSTAB 8.xx

    Main Program

    The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

    Price of First License
    2,550.00 USD