A cross-section rotates suddenly within a member or a continuous member.
What is the reason and how can I fix it?


It is caused by the automatic orientation of the local axes related to the global axis system. In most cases, it is sufficient to specify the member rotation by using an angle or a help node. However, if the member inclination is reversed, it is necessary to split it and then adjust it by means of the member rotation.

You can find a detailed description of the member rotation angle in RFEM and RSTAB under the links below.


Axis system Rotated Local axes Member axes


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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