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The most common causes of unstable models are failing member nonlinearities such as tension members.
The following model of a frame whose columns are simply supported at the base point and which has moment releases at the column head serves as an example of this.
However, if it is loaded vertically, both tension members fail and the structural system becomes unstable, which causes a calculation error. You can avoid such an error by selecting the exceptional handling of failing members under "Calculate" → "Calculation Parameters" → "Global Calculation Parameters".
Model Used in
Steel Frame Structure
| Number of Nodes | 4 |
| Number of Members | 5 |
| Number of Load Cases | 3 |
| Total Weight | 0.668 tons |
| Dimensions (Metric) | 5.500 x 0.500 x 5.250 m |
| Dimensions (Imperial) | 18.04 x 1.64 x 17.22 feet |
| Program Version | 8.04.00 |
You can download this structural model to use it for training purposes or for your projects. However, we do not assume any guarantee or liability for the accuracy or completeness of the model.
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