FAQ 001101 EN-US


Robert Vogl Calculation RFEM RSTAB

In my L-section, there is no My or Mz moment when rotating the member by 45°. What is the reason?


In the case of unsymmetric cross-sections (angles, Z-sections), main axes are inclined. The main axis angle α describes the location of the main axes relative to the standard main axis system: this is the angle between the axis y and the axis u. It is defined as positive if clockwise.

If a bending moment at an unsymmetric cross-section is determined, the designation of the bending moment changes to Mu and Mv. These moments also relate to the main axes of the cross-section. If the axes u or v run parallel to the load direction, the corresponding internal force Mu or Mv is omitted.

The position of member axes can be activated in the Display naigator under "Member Axis Systems u,v,w."


L-section unsymmetric cross-section main axes axis system bending moment angle

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RFEM Main Program
RFEM 5.xx

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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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RSTAB 8.xx

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

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