Avoiding Calculation Break-offs by Using Buckling Members

Tips & Tricks

Second order analyses may sometimes lead to error messages that can be traced back to instabilities due to failed tension members: If compression forces occur in a tension member during a calculation step, this member is no longer considered in the next iteration step. Thus, the model can become instable. Bracing consisting of angles (L‑sections) can resist even small compression forces. If these members are not defined as member type “tension member” but as “buckling member”, it is often possible to calculate problematic models (see Figure).

Buckling members are also suited for models in which the critical load of a beam member is exceeded. After the classification as buckling member, the calculation is continued without this member so that a successful analysis becomes possible because of the redistribution effects.

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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