Eighth week

1.Put the ledger on, test the stiffness.
Stiffness:166.6lbs/in.
2.Put the OSB on, ready to test tomorrow afternoon.The first 8x9 monotonic test.

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Eighth week

1.Put the 8'x9' frame in the test frame.(Move the roller to adjust the 8x9 shear walls)
2.Test the stiffness.(Give 1in.displacement)
Stiffness of the 8'x9' stud to track frame is 94.15lbs/in.

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Seventh week

We have already done the test number9 and number 10, will update later...
Get started with 8'x9' shear wall, big guy.
The T shape: we connect two 4'  long T shapes together, but the cross-section of the connection is not flat,it makes the whole T shape look like bending. I will make it flat.

Sixth week

From Peng

To file

11/17/2011

Test 8

8*-4x9-OSB-54mil-2’over-8’up seam-cyclic

Pre-test

No over-drilling screw found for test 8. Just 2 fasteners at the bottom is too close the vertical seam, the previous ones was missed the flange of bottom track. re-drilling, too close.

Strap is good,no gap.

Vertical Seam is in the middle, looks fine.

The additional stud is 1’ over. Fastener spacing  is 12in.

After-test

43 circle reference displacement:1.988in.

 The peak is 3929lbs,displacement is3.329in.

The failure occurs at the horizontal seam and vertical seam connection area first, then the fasteners on the vertical seam on the south board pull through OSB.

The 2 fasteners on the 2’x8’ OSB without additional field stud side pull out first at the 38^th circle. Fasteners on that OSB in vertical seam fail at 41^st circle. Fasteners near the horizontal seam pulled through, others near the bottom wood bearing failure observed. The fasteners tilted observed at the bottom of middle field stud.(2’ to the bottom)

2 fasteners at bottom on the OSB without additional stud failed, one near the vertical seam pull through, the other is wood bearing failure.

Tear-out failure observed at the edge of the horizontal seam.

The additional field stud is fine, no fasteners fail observed.

Fasteners at bottom go through 2 layers steel(track and stud) often get cut off.

 A little lifting up of the shear wall during the test. I don’t know if it is the reason of the hold down or the anchor not tight enough. Will see next test.

Photos

Pretest

Aftertest

 We observed the piece of steel under the washer on the holddown bent a little bit during the test.

Sixth week

From Peng

To file

11/16/2011

Test 7 

7_4x9_OSB_54mil_8'up_1'over seam_cyclic

Pre-test

43 circles

Reference displacement:1.988in.

There are two fasteners on the seam location is over-drilling, I recorded.

The vertical seam seems a little gap. 0.052’’, but it is okay.

Additional field stud at 1’ over. The additional field stud is 600S162-54mil(33Ksi).

Fasteners on the Strap are good

Two fasteners on the vertical seam miss the flange of the additional stud. Re-drill

See how vertical seam behave..

After-test.

The peak is 3588lbs,displacement is 2.230in.

The failure occure at the vertical seam and the horizontal seam.

The fasteners on the 3'x8' board at the vertical seam pull out.

Horizontal seam, from vertical seam to north chord studs, the fasteners on the top boards pull out. From vertical seam to another side chord studs, the fastener on the seam is fine. The vertical seam failure near the 8’ high come first at 35^th circle and the it goes through the bottom and the horizontal seam breaks at 38^th circle observed.

The 1’x7’ OSB  good, no fasteners pulled out.

The middle and additional filed studs connection with track, bottom and top track flange buckle.

Bottom, just two fasteners at the 3’x8’ near the vertical seam is pull out, others are fine. 

Photos

Pretest

After test

Sixth week

1.Test 6 is tested today.
2.Put the test 7 in the test frame, we will test tomorrow after Dr.Yu's group meeting.
3.I found I need to take more photos from test1-5 while I was doing the test summary. Will email Dr.S.test summary from test1-5 soon.

Fifth week

1. Finished building shear wall number 7 and 8.
2. Cut OSB 3/8'' at the bottom.
3.Have done the test number 5.

After-test

Reference disp:3.313x0.6=1.988in.

43 circles in total.

Peak load:4093.9 lbs

Ultimate displacement+:2.83in

The failure occurs at the bottom at 38^th circle

The bottom fastener are pulled out.

Fasteners on the chord studs,2’ to bottom, are pulled out.

2 fasteners on the field stud at bottom is pulled out, bottom one screw head is cut off.

No damage is observed on the strap, no fastener tilted.

Steel channel, hold downs are all good.

Photos  

Pre-test

After-test

Videos

http://www.youtube.com/watch?v=_M71Qu5Qit8

http://www.youtube.com/watch?v=8asofptVkwg

Later, I should combine these two videos.