I am performing non-linear analysis on a bridge deck modeled as a layered shell element. The bridge deck is supported by four concrete girders which are modeled using section designer in SAP2000.
I am applying the load in steps in order to measure the deflection on in the model for the loads.
Hi,
Many of these convergence problems are because of instabilities.
1. Do a modal analysis and check the first mode shape and period.
2. Appy a static load in the direction of loading in nonlinear case and check the deformations under that load.
3. Reduce your step size and see if it improves the analysis.
4. Change the boundary conditions and increase the indeterminacy. (e.g. change hinge supports to fix supports, reduce hinges in model) and check if the convergence is obtained and then find the source of the issue and then consider something between hinge and fix for such zone using springs,...
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