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FAQ 004114 EN

8 October 2019

Stine Mareike Gebhardt Results RFEM RSTAB Nonlinear Analysis

In a nonlinear system, some load cases do not converge. In contrast, it is possible to easily calculate the load combinations. What can be the reason for this?

Answer

When defining nonlinearities, for example failure of a support under tension, it may happen that some load cases can not be calculated. If these are loads that can not occur without other stabilizing loads, solving the problem is simple: You can set the load cases to "Not to be calculated." As a result, only the load combinations are calculated in the "Calculate All" calculation process. This is possible because, for example, some loads can never occur without self-weight.

In the attached example, you can clearly see that the system would tip wind in the load case and thus no convergence is found. In contrast to this, it is possible to calculate the load combination in which self-weight and wind are combined, because the self-weight stabilizes the system.

Keywords

Load case failure Nonlinear Horizontal Wind Seismicity Convergence criterion

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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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