hi

im performing IDA for a 30 story consisting of bearing wall system of special shear walls for gravity and lateral resisting system , i usually face convergence problems with that , the walls are modeled as MVLEM-3D model and i have perimeter beams as well modeled as nonlinear fibers , how can i avoid divergence and where can i get the best dynamic solver for time steps , system and algorithm to solve it automatically please ? with my thanks in advance