Fifth Week

 After Test

Reference disp:3.313x0.6=1.988in.

43 circles in total.

Peak load:4018 lbs

Ultimate displacement+:2.4in.

Failure occurs at seam location at 35^th  circle.

Vertical fasteners on the back to back studs fails at the 40^th circle.

From seam location down to 2’, it is the staggered fasteners failure area.

Field stud location, OSB side, vertical fastener, from seam down,2 fastener pull through, one fastener in the middle pull through, others are fine.

Observe movement at seam location at 31^st circle.

Hear Sound(I think screw being cut off) at 32^nd circle.

The bottom fasteners are partially pulled out ,the screw head is still in the sheathing.

The small piece of OSB, from seam upward, 2 fasteners staggered on the each back to back stud and field stud are all pulled out.

The strap: The fasteners on the chord stud are cut off.

The screw are tilted on the strap.

The steel clip and channel connection is fine.

Photo