Simulation does not seem to calculate section properties correctly.  I am doing a beam analysis.  In the analysis is a 3.5" Schedule 40 pipe.  Simulation shows the neutral axis down the center of the pipe.  However, Ixx and Iyy are different.   It calculates Ixx as 3.98e6 mm4 and Iyy as 1.99e6 mm4.  Hand calculation shows 1.99e6 mm4.

I also notice that Rectangular Hollow Sections do not have the correct properties either.  I haven't check angles because the neutral axis are different.

What gives?  Anyone else notice this?   Is there anyway to override the Simulation calculations?

Thanks

Peter