I have problems with the definition of equivalent imperfections in RSTAB. Which factors do I have to consider in a correct input?
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.
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Generation of equivalent geometric imperfections and pre-deformed initial structures for nonlinear calculations
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions