Ninth week

From Peng

To file

12/6/2011

Test12

12-8x9-ledger-OSB-54mil-8’up seam cyclic

Pretest

43circles

Reference displacement:2.92x0.6in.

8’x9’ shear wall, horizontal seam at 8’up.Vertical seam at 4’over.

Strap is good.

2 over-drilling screws at the horizontal seam recorded

Anchor spacing is 2’

After test

Peak load+:10049lbs

Displacement: 2.2672in.

Peak load-:-8443.1lbs

Displacement:  -1.6616in.

The failure occur at the bottom, fastener pull through OSB with titled

Fasteners up to 2’high on the chord studs pull through the OSB

At the bottom vertical seam which is up to 1’, the fasteners fail with wood bearing failure and pulling through OSB.

The strap is good, no damage observed

The outside of the horizontal seam tear out.

The connection of the vertical and horizontal seam is broke because of the contact.

Fasteners in the corner at the bottom are cut off the head.

Photo

 After test

Bottom fasteners (1)

 Bottom fasteners (2)

 Bottom fasteners (3)

 Bottom fasteners (4)

 Bottom