AASHTO Wood Reference Design Values (Table 8.4.1.1.4-1)

Question

AASHTO Wood Reference Design Values (Table 8.4.1.1.4-1)

Dusni (Structural)

(OP)

17 Oct 17 00:26

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 (Structural) · Answer 1 · 2017-10-17 00:57:29

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 (Structural) · Answer 2 · 2017-10-17 01:08:23

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 (Structural) · Answer 3 · 2017-10-17 02:18:53

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

Dik

TehMightyEngineer (Structural) · Answer 4 · 2017-10-17 11:05:58

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

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American Concrete Industries
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SlideRuleEra (Structural) · Answer 5 · 2017-10-17 11:31:01

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.

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bridgebuster (Civil) · Answer 6 · 2017-10-17 11:58:12

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

http://files.engineering.com/getfile.aspx?folder=b7c23451-fb09-45c5-9a2f-b7

dik (Structural) · Answer 7 · 2017-10-17 14:02:36

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 (Structural) · Answer 8 · 2017-10-18 18:10:19

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

Mike McCann, PE, SE (WA)

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AASHTO Wood Reference Design Values (Table 8.4.1.1.4-1)