Time History Results discrepancy?

Question:

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Answer:

Hello,

Due to mesh size, there can be minor difference.  But generally when the difference is very high for time history analysis, it due to improper time history load case definition.  It was noted that the time loading function has least time duration in multiple of 0.0001 sec, while the time history load case had a time increment of 0.01 sec.  This would lead to an impact sort of loading on the structure when the loading suddenly appears at a node.  To avoid this, just increase the time increment to 0.0001 sec in the time history load case as indicated in the image below.