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Anonymous
759 Vistas, 6 Respuestas

MASSPROP command vs Parallel Axis Theorem

Hello,

 

I've been trying to calculate the Moment of Inertia of this compound section:

 

compound section.png

Here below some data that I have used for my calculations. The centre-to-centre distance between the 2 trapezoids is 25 mm:

 

ok.png

As you can see, Ixg calculated with the equation and Ixg calculated with the MASSPROP command of AutoCAD aren't the same. Both trapezoids have been drawn with polylines and I used the REGION command before using the MASSPROP command to give them a solid feature.

 

Can anyone please shed some light on this? 

 

Thank you

 

 

 

 

 

 

 

 

 

 

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