Using Buckling Members for Unstable Models

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If the calculation of a member model according to the second-order analysis is terminated with an error message, this instability is often caused by failed tension members: As soon as compressive forces appear in a tension member during a calculation step, this member is no longer considered in the following iterations. Thus, the model can become unstable.

Bracing consisting of angles (L‑sections) can resist even small compression forces. If these members are not defined as a "tension member" but as a "buckling member", problematic models can often be calculated.

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

Author

Dipl.-Ing. (FH) Robert Vogl

Dipl.-Ing. (FH) Robert Vogl

Technical Editor, Product Engineering & Customer Support

Mr. Vogl creates and maintains the technical documentation. In addition, he is involved in the development of the SHAPE-THIN program and provides customer support.

Keywords

Instability Calculation break-off Tension member Buckling member L-section Angle Bracing

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