Allowable tensile load in wood strut 3

[IFRs]

I am looking at a wood structure made from 2x4 No2 grade Douglass Fir-Larch. There are 3/8" steel bolts 1 7/8" in from the ends of the 2x4's, the bolts are going through the 2x4's in the 4" direction ( 5" long bolts ). My question is: what is the allowable tensile load in the 2x4? I assume that the pull-out strength of the bolt in the wood is the limiting factor here. I need the allowable bearing load on the wood and any reduction needed for edge distance. What would be good sourced to find this info? Thanks !!!

 

[ERV]

National Design Specification, or NDS.

 

[RockEngineer]

Here is a link for you to the data.

http://www.forestprod.org/awc/

 

[IFRs]

How do the NDS specs compare to

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

?

 

[ERV]

The NDS has tables for just about anything to do with structural wood design. It is referrenced in all building codes in the United States, so it is accepted by practically all building jurisdictions. The link that you have provided has good info, however, I don't know that if referrenced, it would be accepted by building officials or design professionals, and that is the key here; acceptability.
Try this link:

http://www.iccsafe.org/e/prodshow.html?prodid=350P01&stateInfo=AnufkcSAaikkkBlR7216|4

 

[RockEngineer]

The NDS gives you allowable stresses for commercially available structural types of lumber. These allowables vary based on the size and shape of the piece upt to 5x5. Above 5x5 there is a standard allowable which is usually much lower than for the smaller dimensional lumber sizes.

The wood handbook you referenced gives the strength of "small clear specimens" which is much higher than most dimensioned lumber. The wood handbook is great background to understand why there are differences and what can make a difference in the allowable stress in wood but it is not a design standard. If you are not aware of the design requirements and the difference between the strength of small clear specimens and various grades of structural lumber you can get yourself in trouble. Wood is not uniform like steel and has very unique design characteristics.

There are places you can get the NDS books without the ASD books for less money. If you are going to do much with wood the ASD books are great and have a lot of helpful tables.
The UBC (Uniform Building Code) prior to 1997 edition had all the values for wood design included. There are still some tables with wood properties and rafter and joist sizing in the 1997 UBC. The IBC (International Building Code) and IRC (International Residential Code) have some but mostly refer you to NDS.

(That's enough acronyms to choke a horse) Good Luck

 

[IFRs]

Folks - Thanks a lot !!!
I have only occasional need for wood design, but I may spring for the design books anyway - they are not very expensive, compared to the Aluminuma and Steel books I'm used to. Unfortunatly, I'm not a member of the wood groups. For now, I think I'll go to a nearby engineering university library to get the allowable bearing stress and the edge distance recomendations for the lumber involved (Unless one of you nas the NDS and wants to look it up). I will also ask the fabricator to perform full scale tensile tests to confirm the numbers.

 

[boo1]

For bolting stresses and edge distance guides see:

http://www.fpl.fs.fed.us/documnts/FPLGTR/fplgtr113/Ch07.pdf

https://www.aitc-glulam.org/shopcart/Pdf/aitc_tn_19_ may_2002.pdf

For wood bearing capacity prop see:

http://web.usna.navy.mil/~greg/en442/files/NDS Tables.xls

http://www.fpl.fs.fed.us/documnts/FPLGTR/fplgtr113/Ch04.pdf