Before running nonlinear analysis on a SAFE model, we recommend verifying the stability of the model under linear cases by checking the analysis run through Run > Last Analysis Run Log.
One common solution to convergence problems is providing lateral supports for in-plane reactions along the X and Y axes. Note that soil supports only resist vertical loading along the Z axis. To provide lateral support, we recommend using springs with stiff proprieties in the X and Y local axis, then those springs may be assigned along the edges/corners of the mat. Alternatively, a 2D-plate analysis may be run by selecting Run > Advanced Modeling Options, though in-plane axial forces will be neglected (2D analysis is never recommended for models with walls above).
Additional notes on the modeling of uplift include the following:
Related Incidents:
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Review watch and learn videos 9 and 10 below:
Available at https://www.csiamerica.com/products/safe/watch-and-learn