5ply built up Wood colum 3

[CDG31]

I am trying to find a nailing pattern for my 5ply 2x6 built-up wood column. According to NDS 15.3.3.1 b) all nails have to penetrate all my laminations and at least 3/4 of my outermost lamination. For my 5ply wood column the nail should have a length of at least 7.125" but the maximum size of a common nail, 60D, is 6in. Should I use bolts to attach my plies together? I heard is an expensive option. Should I use a stronger species thus reducing my number of plies? What would be the best option for my case?

Thanks,

CDG31

 

[Celt83]

my own rules of thumb over 4-plys requires bolting, and don't use more than 4-ply gang post but instead transition to a PSL post.

Open Source Structural Applications:

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[msquared48]

Simpson makes 1/4 x 8" SDS screws that might be useable if you added an extra 1/2" to the column width...

Mike McCann, PE, SE (WA)

 

[TehMightyEngineer]

I'd cut down on the number of plys, I've never seen more than 4 plys make sense structurally or economically.

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

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[CDG31]

Thank you all for your replies.

Celt83,

If I may ask, what nailing pattern do you use to attach the 4ply gang post?

Thanks,

CDG31

 

[msquared48]

2@6 staggered

Mike McCann, PE, SE (WA)

 

[SlideRuleEra]

ANSI/ASAE EP559 "Design Requirements and Bending Properties for Mechanically Laminated Columns" for 3 and 4 ply columns. See Section 5 for joint arrangement and nailing specs.

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