3/4"x24" wood, Allowable Fb?
3/4"x24" wood, Allowable Fb?
(OP)
I am an experienced structural engineer, however, I am a novice to wood design, I do have the current NDS set. I am building a home bar, and would like to check how long I can span 24"x3/4" maple or cherry wood, flat use, simply supported. How do I determine or where can I find the allowable Fb, prior to multiplying by the applicable adjustment factors. I plan to use 10psf total load.






RE: 3/4"x24" wood, Allowable Fb?
My 1999 NDS set (ASD) came with a supplement for structural use panels. It has the information you're looking for, as well as examples showing all of the design checks.
RE: 3/4"x24" wood, Allowable Fb?
RE: 3/4"x24" wood, Allowable Fb?
to be honest, use some plywood substrait or MDF, and put the wood over it, it will be alot more solid.
RE: 3/4"x24" wood, Allowable Fb?
RE: 3/4"x24" wood, Allowable Fb?
RE: 3/4"x24" wood, Allowable Fb?
RE: 3/4"x24" wood, Allowable Fb?
If it's a "bar" that will support drunken co-eds, something along the lines of what they do at Coyote Ugly, then go with a 100 psf live load. Self-weight dead load.
here's some info on Hard Maple: http://ww
here's some on cherry: http:/
The values given need to be reduced by a safety factor; I think the NDS (don't have it at my desk...) builds-in a safety factor of 2.6 to the values published in the supplement.
Apply wet use factor, too.
You should have too much of a problem with building the bar at all.
RE: 3/4"x24" wood, Allowable Fb?
6 or 7 feet sounds too far. You don't want a bouncy bar. I am thinking 2' is best, 3' most.
RE: 3/4"x24" wood, Allowable Fb?
RE: 3/4"x24" wood, Allowable Fb?
NDS takes this information directly from the "Northeastern Lumber Manufacturer's Association"; here is their download
http:/
Cherry is a little trickier, it does not seem to be rated by any organization. However is you download the USDA Forest Products Lab's "Hardwoods of North America"
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The most direct comparison for bending strength is the "Modulus or Rupture" (MOR).
You can also get the Modulus of Elasticity (MOE) for cherry from this document.
The "flat use" factor, and many of the others apply only under very specific conditions. 3/4" inch thick lumber is too, thin to take advantage of "flat use".
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RE: 3/4"x24" wood, Allowable Fb?
Oops, should have been "You should not have too much of a problem with building the bar at all."
Post a photo of the bar when it's complete -or, better yet, invite all of us over for a beer.
RE: 3/4"x24" wood, Allowable Fb?
A carpenter/joiner should be able to tell from experience what maximum span to use.