Beam Analyses

[Ron Nossaman]

>Utility? Comments?
>
>Terry Farrell

For us? Not awfully handy, I think, since we would have to go elsewhere to 
figure the MOI for input, unless that's there somewhere too and I didn't 
see it. As long as we're using nominally rectangular cross section ribs and 
figuring a center load, I think it's easier to just do this:

With E being the Modulus of Elasticity in psi, which for Sitka Spruce is 
about 1570000, and load in pounds.
In inches, Deflection= (length^3 * load)/(4*E*width*height^3)
In millimeters, Deflection=(length^3*load)/(0.0062*E*width*height^3)

Some of these on line calculators will have the formulas for the 
calculations in the page source code, in the same form as the input boxes, 
making it easy to see what they did mathematically to produce their 
answers, and cross check their methods against those from other sources 
when you get two (or more) different answers from different calculators. 
This one, like many others I've looked at, submits the information to 
another form I can't look at to do the calculations. Is there a way to go 
this? Are there any HTML gurus out there?

Ron N