FAQ 000107 EN

Modeling | Structure RF-IMP RSTAB

I have problems with the definition of equivalent imperfections in RSTAB. Which factors do I have to consider in a correct input?

Answer

In general, you have to pay attention to the following:

  • The members must have the same member rotation.
  • The direction for the input of imperfections is related to the local axes y and z. A relation to the principal axes u and v is also possible in case of deviating principal axes.
  • It is also possible to influence the position by a change of signs for the imperfection value.

Therefore, when defining imperfections, it is often useful to display the local member axis systems: select a member by right-clicking it and activate the display of the local axis systems in the shortcut menu.

RFEM Other
RF-IMP 5.xx

Add-on Module

Generation of equivalent geometric imperfections and pre-deformed initial structures for nonlinear calculations

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