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Hand-calculate Moment Area of Inertia

Hand-calculate Moment Area of Inertia

Hand-calculate Moment Area of Inertia

(OP)
For a truss, do I include only the bottom and top chords, and ignore any truss webs?

RE: Hand-calculate Moment Area of Inertia

I would. The webs will contribute, but not much, therefore you'll be slightly conservative. I look at truss chords as similar to the flanges on "I" section beam.

RE: Hand-calculate Moment Area of Inertia

(OP)
There was something I forgot about, brought up by someone else's reply in a related thread I started .

Shear deformation ... seems to significantly increase the actual deformation, maybe as much as 20%.

I just was speaking to Simpson Strong-Tie, and by "accident" they mentioned they are starting a truss design division.

I asked that the "nerd-in-charge" (j/k) give me a call so I could ask him what science and assumptions the software uses.

RE: Hand-calculate Moment Area of Inertia

They bought keymark software a year ago

RE: Hand-calculate Moment Area of Inertia

Back when I used Keymark software around 1990 it was not good. They pretty much faded away, as far as I could tell. I didn't know they were even still in business.

RE: Hand-calculate Moment Area of Inertia

(OP)
Well, if Simpson is using it, than that is not good.

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