NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
(OP)
Does anyone know of any kind of adjustment factor to use with NDS Table 11N for nails connecting two wood members with the nail inserted through the side grain of the first member (deck rim) into the end grain of the second member (end of cantilevered deck joist). I need to evaluate this connection for the nails loaded in shear only. My attached guard detail 6 has a 2x rim attached to the end grain of a cantilevered deck joist. This connection has been challenged to demonstrate it can support the code required 200lb load applied vertically on the guard post, which translates down to the connection between the rim and the end of the deck joists. This would require that 6-16d's connecting the rim to the end of the joists can carry that 200 lb load. Seems like they should have that capacity. I can't find anything that addresses this though. I've used this connection for years, but never had this kind of challenge to it before. The NDS tables are clear that the table values are only for cases where both members have the nail axis perpendicular to the wood fibers. Of course nails into the end of a deck joist would not be that condition, but the only adjustment factors I can find to use with this table do not address the condition I'm dealing with.
Any ideas?
Any ideas?






RE: NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
http://www.homedepot.com/p/Simpson-Strong-Tie-ZMAX...
RE: NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
RE: NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
RE: NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
Make sure to account for the minimum penetration too.
From what's shown in the sketch, I'm not sure it's a simple shear connection either. If it's supporting a guardrail, I'd at least check it for combined shear and withdrawal from the vertical and lateral handrail loads. And the Medeek part of me would want to consider additional withdrawal from the lateral guardrail load over that moment arm.
But in general, I'm with Fegen... I'd probably just add the bracket.
RE: NDS adjustment factor for 16d common nails inserted into end grain of wood joist loaed in shear?
Found what I was looking for last night. NDS 11.5.2.2 End Grain Factor of Ccg = 0.67 applied to the reference lateral design values Z found in Table 11N. 6-16d's holding the rim to the end of the deck joists has a capacity of 6(141 lb)(0.67) = 567 lb. Works
I know I could have added A35 of other angle brackets to address the plan checker's issue, but I really to wanted to know if this connection I've been using for 20+ yrs calcs out or not. Luckily it does.