The ASD Hold Down capacity was 30% higher than the Plywood shear wall
and yet the Hold Down failed by ripping the screws out of the stud. The
plywood showed no obvious signs of distortion relative to the studs. So
the wall must have lifted off the base still square in shape.
Ultimate load was 4.7 times the sheathing design capacity and 3.5 times
the holdown capacity.
Something is seriously wrong. This is the second event I have heard of
where the HD failed before the plywood.
Ultimate strength of plywood needs to be reconsidered to not first fail
the HD, Resulting in little plywood ductility. You know, the stuff that
allows the very high rho of 6.5
David Merrick, SE
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