Using Buckling Members for Unstable Models

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.

Instability Message Due to Failure of Tension Member

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.

Result with Buckling Members

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.

Knowledge Base

KB 000577 | Using Buckling Members for Unstable Models

Author

Mr. Vogl creates and maintains the technical documentation.

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