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mom net of inertia of beam with holes

mom net of inertia of beam with holes

mom net of inertia of beam with holes

(OP)
this should be pretty basis but its been a while i wanted to check how do I account for the moment of inertia of a beam that has a slot in the center .

RE: mom net of inertia of beam with holes

Parallel Axis Theorem. And then add (or subtract in your case) the moments of inertia

RE: mom net of inertia of beam with holes

If the slot and beam are doubly symmetrical, I = Ibeam - Islot; otherwise I = ΣIs where Is is the moment of inertia of solid parts about the c.g. of the section.

BA

RE: mom net of inertia of beam with holes

Unless it's a big hole, the reduced moment of inertia reduction will be small. Subtrace w*d^3/12 from the original I of the beam, if hole is in middle... w-web thickness d-hole diameter.

Dik

RE: mom net of inertia of beam with holes

Agree with dik...

Mike McCann, PE, SE (WA)


RE: mom net of inertia of beam with holes

If any significant shear, I treat it as two T beams...

Dik

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