There is always an instability, even when calculating a simple frame. How can I fix this?

Answer

Your model is unstable because there is the Compression member type assigned to the columns. In RFEM, a compression member means that the element is only subjected to compression, and has hinges at the ends, so it does not transfer any moments. The hinges cause the instability. These elements are used in steel structures, for example. For this reason, it is recommended to use the Beam member type that can transfer all types of loads and is generally used for columns.

Keywords

Instability Compression Beam

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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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