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Re: needed, one number cruncher
Re: needed, one number cruncher -- Guido	Post Reply	Top of thread	Forum

Posted by: swearingen ® 12/21/2005, 08:31:42 Author Profile Mail author Edit

If you already know the I of the S8x15 and if the flats are centered vertically on the S8, then you just add the I of the flats to the I of the S8 for the total. The I of the flats is 7.15 in^4. I would tighten up the weld stagger, though. A 9" unsupported length of 0.125" plate may not transfer the internal shear you need without locally buckling. I probably wouldn't go over 6" O.C. In fact, a 1" stitch every 4" would be even better. One other thing: you can get much more help with deflection if you put plates on the top and bottom flanges. If you put the plates top and bottom and w = plate width, t = plate thickness, and d = depth of the S8, then the I of the plates that you would add to the beam would be: I = (2*w*t^3)/3 + (w*t*d^2)/2 + w*t^2*d Modified by swearingen at Wed, Dec 21, 2005, 08:37:56

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