Moment of Inertia Equations

Structural Layout Vignette and Multiple Choice

Moment of Inertia Equations

Postby GREMMELS » Tue Jun 20, 2017 3:25 pm

Jenny's Notes:
I=bd*3/12 (where the neurtal axis passes through the centroid)

I=bd*3/3 (when axis is at the base of a rectangular section)

Not sure what these descriptions mean. I keep seeing examples that use the first equation that I think should use the second equation and I'm not sure which is right anymore.
It seems like the first equation applies to most of the examples but when is the 2nd equation used?
Can someone help me understand when to use each equation?
GREMMELS
 
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