shift of results of transient analysis between solid part model and line body model

hi everyone

i am analyzing a simple steel frame under transient triangular load i used two models the first is 3D solid part model and the second is line body model the results of static analysis and modal analysis are almost identical but the results of transient analysis seems to develop a shift of results that increase with time i verified the results of the line body model using another software and it provided identical results to workbench

i want to know the reason of that shift


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