Request for Assistance Regarding Convergence Issues in Pile–Soil–Pier Dynamic Analysis

[YiiihanChen]

Hi,
I hope this message finds you well. I am writing to seek your guidance regarding a convergence problem I have encountered in my numerical modeling work.

I have developed a two-dimensional pile–soil–pier model using the p–y curve method. After applying seismic excitation, the analysis exhibits severe convergence difficulties at the onset of the dynamic phase, with non-convergence occurring within the first few computational steps.

To address this issue, I have attempted several adjustments, including modifying the soil constitutive parameters and unit system, altering the parameters of the p–y and t–z springs, removing the pier and bearings, removing both the pier and the pile, and revising the boundary conditions of the soil domain. Unfortunately, none of these efforts have resolved the convergence problem.

I would be deeply grateful if you could kindly review whether my definitions of the zeroLength elements and materials for pile–soil interaction have been implemented correctly. If there are inaccuracies, I would appreciate any suggestions on how they should be properly configured. Additionally, I would like to confirm whether the modeling of the elastic rubber bearings and the associated material parameters is appropriate. Any insights you might provide into the underlying cause of the non-convergence would be immensely valuable.

Thank you very much for taking the time to consider my request despite your busy schedule. Your guidance and expertise would be sincerely appreciated.