Ninth week

From Peng

To file

12/6/2011

Test13

13-8’x9’-ledger-OSB-GYP-8’up seam

Pretest

Put the shear wall in the test frame first, then put the gypsum board on it, clap them, drill screws and cut half inch at the bottom. Look good.

Check the OSB side, one fastener at vertical bottom close to the OSB edge.

Other fasteners are okay.

Photo 

Meanwhile, we are doing the fasteners and OSB(horizontal and vertical strand) connection test.

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 

Ninth week

From Peng

To file

11/30/2011

Test 11R

11_Retest_8x9-ledger-osb-54mil-8’up

(stud: 600S162-54mil(33ksi))

Everything looks good.

We use 600S162-54mil(33ksi) as our field studs and chord studs.

Strap is good, no gap.

After test

Peak load:8708.3lbs

Displacement: 2.4182in.

Failure occur at vertical seam and OSB bottom, fasteners titled then pull through.

Failure is at one of 4x8 OSB on south side.

Fasteners at vertical seam on south side complete pull through,

3 fasteners at horizontal seam near vertical pull through

3 fasteners at the bottom near vertical seam pull through.

At the edge of  horizontal seam, OSB tear out.

Fasteners on south side field stud title, no damage.

Observe all the fasteners at the strap and bottom title.

Photo

 After test

 horizontal seam and vertical seam

 After test 

 Middle field stud

 Bottom of vertical seam

 Fasteners at the strap

Fasteners at middle field stud

Eighth week

Assemble another 8'x9'shear wall today.
Double check the details.
Will do monotonic test with Dr.Yu tomorrow afternoon.

Photo