If numerical instability occur within an ETABS model, we recommend considering the basic troubleshooting techniques which follow:
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- Releases. Do not release moment for objects adjoined at the same joint, such as with beam-column connections. Also, do not release moments at the base of a column that has a pinned restraint (i.e rotations allowed). Multiple coincident releases will cause numerical problems. If necessary, one object may be released.
- Self weight. Ensure that deflected configuration under self-weight is as expected.
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Related Incidents:
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What does it mean when numerical instability warnings are reported, but there is no joint at the location indicated?
Answer: Numerical instability is reported according to numerical formulation and the sequence in which equations are solved. The point indicated is not necessarily a discrete point at which instability occurs, but rather a location related to the assemblage of objects with significantly different stiffness.
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Refer to page below for further recommendations:
See Also
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