Load factors(stress)

[dewwood]

I am in need of some load factor tables for strength properties of hardwood lumber, specifically bending strength of red oak.  Does anyone know of some reference materials that I can access for this information?

Thanks for any help.

Dewey

[Jim_Rogers]

Go to the Timber Framing section and search for the thread titled: Strength of different kinds of beams? and look in there for links to the calculators that Don P created and posted on this forum database.
In any of the calculators is a link to another page that has the values you are looking for.
Good luck with your research.
Jim Rogers

[beenthere]

Dewwood
Graded hardwood lumber (what sizes and what grade) bending properties or clear-wood bending properties?

In addition to Jim's recommendation, Tom sites a WoodHandbook that has clearwood properties for all species of wood (nearly all).

[SwampDonkey]

I'de suggest using the forum first but, here is a handy table I keep bookmarked.

http://www.hardwoods-inc.com/physical_properties_1.asp

[Tom]

Here is the link that I generally offer to questions like this as beenthere stated.

http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/fplgtr113.htm

It is documented in our knowledge base and in the links library.

There is a lot of good info in this publication if you can take the time to read it.  It is helpful to peruse it just to know what info is available  so that it will be handy next time.   I use it all the time and even enjoy reading it when I have nothing else interesting to do. :P :D

[SwampDonkey]

Tom:

I almost lost touch there for a moment. Jeff took away the links icon and now its just in the menu.  phew ;D

[Tom]

Whew!   I'm glad you found it. :-[

I knew I had clicked on something that took me there. :D :D

I'm suffering from a mild case of "Old Timers" and get confused sometimes. :D

[Don P]

A little background on interpreting the numbers might be helpful.
The Wood Handbook gives the MOR (modulus of rupture) of small clear samples.
The calculator reference page gives Allowable Design Values from the National Design Specification. They arrived at these values using the Wood Handbook information.
To loosely quote from a Timber Framers Guild publication..."For the beam to be acceptable, the results must be from 6 to 8 times less than MOR."

This is a good link for more reading on beams and columns.
http://www.du.edu/~jcalvert/tech/beam.htm

The homepage to Dr. Calvert's website is here, good stuff;
http://www.du.edu/~jcalvert/

[SwampDonkey]

Tom:

Is that contagious? :D

[Tom]

It must be.  I didn't suffer from it a few years ago before I started hanging out here.  :D

I've been seeing Grampt! on here snooping around and figure he's the one spreading it. :D :D

[dewwood]

Thanks everyone for the replies.  I think I have what I need, I have a customer that wanted the strength properties of some 10/4 red oak that they purchase from me and now I can provide them the information they want.

Thanks again!

Dewey

[beenthere]

There is a "Maximum Span Calculator for Joists and Rafters" that should help those interested.

http://www.awc.org/calculators/span/calc/timbercalcstyle.asp

Still requires each piece to have a grade, but the numbers can be found for the lower grades, and that should provide the limits and a ballpark figure to work from.

[SwampDonkey]

Thanks beenthere, I've bookmarked it for future reference.