Author Topic: Fasteners: NDS Specs for Dowel Like fasteners  (Read 3827 times)

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Offline MountainDon

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Fasteners: NDS Specs for Dowel Like fasteners
« on: May 12, 2011, 09:33:37 AM »












Just because something has been done and has not failed, doesn’t mean it is good design.

Offline MountainDon

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Re: Fasteners: NDS Specs for Dowel Like fasteners
« Reply #1 on: May 12, 2011, 09:33:57 AM »

Just because something has been done and has not failed, doesn’t mean it is good design.

Offline MountainDon

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Re: Fasteners: NDS Specs for Dowel Like fasteners
« Reply #2 on: May 12, 2011, 09:34:24 AM »
Just because something has been done and has not failed, doesn’t mean it is good design.

Offline Don_P

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Re: Fasteners: NDS Specs for Dowel Like fasteners
« Reply #3 on: May 12, 2011, 06:57:10 PM »
The last 2 tables give withdrawal strength (being pulled out) based on the density of the wood. A heavier, denser piece of wood holds a nail better than a lighter less dense piece. I noticed the tables shown don't give the average density of some common species, which might be helpful. These average values for density ,G, are from the shear tables in the NDS;
Red oak .67
Mixed Maple/ Southern Pine.55
Douglas Fir-Larch.5
Hem-Fir.43
SPF.42
Eastern Softwoods/WRC/Western Woods.36
Northern Species.35

The species names above would be on the gradestamp. The results of these and the shear tables should line up exactly with the results from the awc.org Connections Calculator. Our engineer stressed the importance of understanding where the codebook tables come from. This is some of the source material for the code tables on fasteners and the reference material an engineer would consult while designing non prescriptive connections.

The proper way to do a toenail pic is worth committing to memory.