AASHTO Wood Reference Design Values (Table 8.4.1.1.4-1)

[Dusni]

Quick question... Southern Pine has the following size classifications:

2"-4" wide
5"-6" wide
8" wide
10" wide
12" wide
5"x5" and Larger

Is "wide" the larger dimension? Is a 2x10 considered (2"-4") or (10" wide)?!

Thanks

 

[dik]

I'm not sure about AASHTO, but with dimensioned lumber you are correct. Your 2x10 is 10" wide... actual lumber dimensions for a 2x10 are 1-1/2 x 9-1/4. The 2x10 is a nominal dimension, and not actual.

Dik

 

[Dusni]

I'm confused with what "size classification" a 2x10 would be in AASHTO LRFD Table 8.4.1.1.4-1. That table gives different design values (allowable stresses prior to applying various strength factors) for the different size classifications which I listed in the original post.

 

[dik]

Don't know... maybe, someone else can provide an answer...

Dik

 

[TehMightyEngineer]

Almost positive that a 2x10 would be 2" wide (nominal) for AASHTO.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[SlideRuleEra]

Depends on how the lumber is oriented. "Wide" is the horizontal dimension. "Thick" is the vertical dimension. A 2x10 used as a typical beam is 2" wide.
A 2x10 used as, say, deck flooring is 10" wide.

http://www.SlideRuleEra.net

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[bridgebuster]

Take a look at the attached, PS-20, The American Softwood Lumber Standard. I believe this is what AASHTO follows. Also, look at the Commentary to AASHTO 8.4.1.1.1

 

[dik]

My screw up... please ignore my comment. The 2" nominal dimension is the width and 10" would be the depth... don't know what I was thinking when I replied.

Dik

 

[msquared48]

I agree with sliderule, and dik's LATEST comment.

Mike McCann, PE, SE (WA)