Linear vs nonlinear time history analysis 1

[BeFEA]

Hello!
Speaking conceptually/ theoretically, when should the deformations be smaller: in a linear time history analysis or in a nonlinear time history analysis? Let's assume everything else is exactly the same in both analyses, just the type of analysis changes.

 

[JasonMcKee71]

NonLinear TH analysis generally considers the softening effect of stiffness on nodes. Thus, larger displacements are likely to be monitored compared to linear TH analysis.

Jason McKee
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[BeFEA]

Thanks for your answer JasonMcKee71. Well, that's the case when I analyze the structure in OpenSees with fiber elements (distributed plasticity). However, when I analyze the same structure in Sap2000, I amazingly get larger displacements for the linear case. This is driving me crazy. What could be the cause?