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I would like to define an orthotropic plate. In order to check the influence of the changed material properties on the stiffness matrix, I would like to know how the stiffness matrix is determine. Also, how is the self-weight of an orthotropic surface calculated?


In RFEM, you can define various types of orthotropic surfaces. The information about the calculation of respective coefficients of the stiffness matrix is available in the 'Stiffness Matrix' tab by clicking the [Info] button (see Figure).

The self-weight determination is based on the specific weight of the material as well as the values defined in the windows of the selected orthotropy type. To consider the self-weight, there are separate text boxes available, where you can enter the equivalent plate thickness, for example.


orthotropic surface orthotropy stiffness matrix stiffness element self-weight orthotropy type


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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

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