King Stud nailing used to resist overturning?
King Stud nailing used to resist overturning?
(OP)
Hello all,
I'm new to this forum so i hope this is the proper place for this question.
My question is when is it sufficient to use kingstud nailing to resist shearwall overturning without a hold down. I am looking over some calculations from an outside engineer(that has been slow to get back to me with answers) that my company has used on a recent residential project. In the link below I have attached a couple sheets of the calcs and highlighted where he uses KS nailing in some areas and hold downs in others with simular R_h values. Each highlighted wall is a shearwall with 6" oc edge nailing.Ive researched around and used NDS and Design of Wood Structures and im having no luck. Any guidance in the right direction is appreciated.
https://res.cloudinary.com/engineering-com/image/upload/v1503020226/tips/Mehan_Structural_Calcs_KS_overturning_iwgeu6.pdf
I'm new to this forum so i hope this is the proper place for this question.
My question is when is it sufficient to use kingstud nailing to resist shearwall overturning without a hold down. I am looking over some calculations from an outside engineer(that has been slow to get back to me with answers) that my company has used on a recent residential project. In the link below I have attached a couple sheets of the calcs and highlighted where he uses KS nailing in some areas and hold downs in others with simular R_h values. Each highlighted wall is a shearwall with 6" oc edge nailing.Ive researched around and used NDS and Design of Wood Structures and im having no luck. Any guidance in the right direction is appreciated.
https://res.cloudinary.com/engineering-com/image/upload/v1503020226/tips/Mehan_Structural_Calcs_KS_overturning_iwgeu6.pdf





RE: King Stud nailing used to resist overturning?
Also - the calculations don't seem to meet the code combination of 0.6D +/- W. Instead it uses 1.0D +/- 1.0W.
Some may argue that the 0.6D + W combo is only for free standing overturning checks but the code doesn't really say that anywhere.
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RE: King Stud nailing used to resist overturning?
The only thing that comes to mind for the term 'king stud nailing' is the higher quantity of nails required to attach a trimmer or header to the king stud...
I don't see how this has any possible relation to overturning of shear walls.
RE: King Stud nailing used to resist overturning?
RE: King Stud nailing used to resist overturning?
I agree.
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RE: King Stud nailing used to resist overturning?
this was my first thought as well.
ya it seems i may have to wait to hear back from him to see what he means here, I'll reply back to this tread once I do.
RE: King Stud nailing used to resist overturning?
Personally, once I checked the lack of hold-downs in a residential project and
a crazycontractor/labor man stopped to place the remainings ones as soon as I leave the place, noticed it on next visit. There are ways to install them if some are missing, but to me it was necessary to change somethings prior to complete the installation.The nails increase sheathing lifespan, improve rigidity (better if anchored), and if balanced can control failure mode giving more ductility, but brittle failure if exceeded.
RE: King Stud nailing used to resist overturning?
I do not get the need for the king stud callout at all. To me, it's just confusing.
Mike McCann, PE, SE (WA)
RE: King Stud nailing used to resist overturning?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: King Stud nailing used to resist overturning?
I thought of this initially, but why use the term 'king stud nailing' when corners between intersecting walls/segments have their own specific nailing standards?
A diagram would be indicative.
RE: King Stud nailing used to resist overturning?
RE: King Stud nailing used to resist overturning?
He's talking about FTAO (Force Transfer Around Openings) and he is either calculating the nailing required in the king stud to transfer the force around the opening, or he is talking about the strap forces perpendicular to the king studs that must be transferred around the opening.