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Warnings in Nonlinear analysis

Question asked by Mustafa Bgr on Jul 4, 2015


I am doing a nonlinear simulation under cyclic loading. But during analysis in warning part of  progress window it is written " Assembled stiffness matrix has negative diagona increment" and in "step number 6", the analysis stops progressing. By the way results are shown and I don't know how valid they are. What can I do?

Thanks in advance