SHEAR WALL ANCHOR BOLTS
SHEAR WALL ANCHOR BOLTS
(OP)
I am having a heated conversation with a contractor. Shear wall anchor bolts at the hold downs are subjected to both shear and tension correct?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: SHEAR WALL ANCHOR BOLTS
RE: SHEAR WALL ANCHOR BOLTS
Mike McCann
MMC Engineering
RE: SHEAR WALL ANCHOR BOLTS
RE: SHEAR WALL ANCHOR BOLTS
DaveAtkins
RE: SHEAR WALL ANCHOR BOLTS
RE: SHEAR WALL ANCHOR BOLTS
The ANCHOR bolts are designed for tension only even though the bean counters are correct that some incidental shear will creep in. Let's not have any PHD papers that make it into the code on this one.
The SILL bolts do take uplift and shear. Again, no PHD papers. The incidental uplift on sill bolts is why we are now putting square washers on the sill bolts and use 3x sill plates when the shear gets too high. The problem is nail slip along vertical plywood joints between adjacent pieces of plywood. One side slips upward and the other slips downward. The downward slip isn't a problem because the sill plate has continuous support. The uplift side doesn't have support and ends up pulling upward on the outer edge of the sill plate. Cross grain bending guys. No real solution here so the code guys are accepting 3x sill plates and square washers on the bolts to resist the localized uplift.
THEN - - if you get much slip from sloppy jamb bolting at the hold down bracket, the localized up lift may be more than localized. Ever see a laborer try to drill bracket bolts from the side of the post away from the bracket. Those holes can get really big.
Sure makes you wonder about using LRFD to design wood, doesn't it?
Old CA SE