The OpenSees Community

It appears that your OpenSees analysis is encountering difficulties during the static pushover analysis of your 4-bay, 4-storey building. The error messages suggest issues with updating the model at various steps, particularly with the ForceBeamColumn2d element. Here are some general troubleshooting steps you can take to address these issues:

Check Model Geometry and Connectivity:
Ensure that your model has been defined correctly with accurate geometry and connectivity. Any inconsistencies in the model setup can lead to convergence issues.

Element Properties and Material Definitions:
Double-check the properties and material definitions of the elements, especially the ForceBeamColumn2d elements. Make sure the properties assigned are appropriate for the analysis.

Initial Conditions:
Verify that the initial conditions of the model are set correctly. Incorrect initial conditions can lead to convergence problems.

Convergence Parameters:
Adjust the convergence parameters in your analysis script. This may involve changing tolerances or convergence criteria to make the analysis more robust. For example, you can try decreasing the convergence tolerance to see if it helps.

Integration Scheme:
Experiment with different integration schemes. Depending on the nature of your problem, certain integration schemes may be more suitable. You can try using a different integration algorithm or adjusting the integration parameters.

Check for Singularities:
Inspect your model for potential singularities or near-singular conditions. Singularities can cause convergence issues. Ensure that your structure is stable and well-conditioned.

Update OpenSees:
Ensure that you are using the latest version of OpenSees. Sometimes, updating to a newer version can resolve known bugs or issues.

Review Applied Loads:
Verify the loads applied during the pushover analysis. Ensure that they are consistent with your modeling assumptions and are applied correctly.

Debugging Output:
Enable additional debugging output in your analysis script to get more information about the failure points. This may help identify specific elements or conditions causing the convergence problems.