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Kellogg 3810 design manual

Kellogg 3810 design manual

Kellogg 3810 design manual

(OP)
Good day all
I've been browsing through the MW Kellogg Design Manual 3810, and came across the concept of linear moment of inertia. I have attached the paragraph from the 3810 design manual.

If I look at the general equation for moment of inertia of a rectangular section, I = bd^3/12.
However, in this manual for Figure III, I = b^3/3. I'm trying to get around this concept with no luck. Can someone please explain this 'Linear Moment of Inertia', and how did the author get to I = b^3/3.

Your assistance in this regard will be highly appreciative,

RE: Kellogg 3810 design manual

because he consider the width of rectangule as 1.
If You write the normal formulas and You substitute the width with 1, You get these results

RE: Kellogg 3810 design manual

Govendes,
Equation given in Kellogg 3810 is basic engineering equation for I and can be found in any textbook and derived using fundamental principles.

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