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8/13/2019 Saat Ciog Lu
1/5
QuakeWrap SEAoA Convention June 24, 20
PileMedic + PipeMedic + QuakeWrap Page
Murat Saatcioglu is a Distinguished University Professor
and University Research Chair in the Department of Civil
Engineering of the University of Ottawa, Ottawa, Canada.
He is the Director of the Haza rd Mitigation and Disaster
Management Research Centre of the same university. He has
conducted extensive experimental and analytical research onearthquake resistant concrete structures, including the development of
seismic design and retrofit methodologies for reinforced concrete and
masonry structures. Professor Saatcioglu is the recipient of numerous
research and teaching awards, including the Wason Medal from the
American Concrete Institute in 2004, the Raymond C. Reese Research
Prize from the American Society of Civil Engineers in 2000, Casimir
Gzowski Medal from the Canadian Society for Civil Engineering in 2001
and 2004, CCEDS-1 Award for Best Paper from McMaster University in
2005. He is a Fellow of the American Concrete Institute.
FRP Laminates for Post-EarthquakeRepair of Columns in 2 Hours
Mo Ehsani, Ph.D., P.E., S.E.President, QuakeWrap, Inc., and
Professor Emeritus of Civil Engineering, Univ. of Arizona
Major Challenges with Post-Earthquake Repair of Columns
1) Shape & Size
One does not know the shape &size of columns that may getdamaged.
Ideal repair system will beapplicable to all columns
2) Ease of Repair
Trained workers are hard to find inthe aftermath of EQ
Ideal repair system will require
minimum skilled labor
Methods of Repair ofColumns with FRP
1) Wet Layup
Repair to smooth surface
Wait for repairs to dry
Wrap with FRP fabric
Requires trained crew to install
2) Laminates
Create a shell around col. with FRP
Fill annular space w/grout or resin
Repair of Columns with Laminates1) First Generation
Developed in early 1990s
Effectiveness was shown in NSF-funded study
Requires advance custom manufacturing oflaminate to size & shape
2) Second Generation (SuperLaminate)
Developed in 2010
One size fits columns of any shape & size
No advance knowledge of column size & shape reqd
Results in much faster repair
First Generation of FRP LaminatesDeveloped in Early 1990s
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7
Control Column Specimen(NSF Project 1992-94)
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load
(kN)
Lateral Displacement (mm)
Control
Control Specimen Repaired & Re-Tested
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load(
kN)
Lateral Displacement (mm)
Repaired
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load(
kN)
Lateral Displacement (mm)
Control
Repaired
Retrofitted Companion Specimen
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load
(kN)
Lateral Displacement (mm)
Retrofitted
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load
(kN)
Lateral Displacement (mm)
Control
Retrofitted
Comparison of Column Specimens
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100
Load
(kN)
Lateral Displacement (mm)
Control
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100Load
(kN)
Lateral Displacement (mm)
Repaired
-100
-60
-20
20
60
100
-100 -60 -20 20 60 100Load
(kN)
Lateral Displacement (mm)
Retrofitted
FRP Laminates are effective inrepair & retrofit of cols.
Multi-Layered SuperLaminate(Patent Pending)
11
Multi-Axial Reinforcement Thickness 0.01 -0.025 inch Tensile Strengthup to 155,000 psi Infinite combinations of strength
& stiffness can be produced ISO 9000 Certified
Comparison of Old & New Laminates
Old Technology New Laminates
Size Customized to Fit One Size Fits All
Width 4-6 inches Up to 5 feet
Reinforcing Fibers Unidirectional Biaxial
Structural Confinement Confinement +Enhancement Only Axial
Moreover, SuperLaminate allow applications thatwould not be possible with the old technology
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Repair of Columns with Laminates
Structural Shell
No Finished SurfaceRequired
Circular or SquareColumns
Methods of Installation
A) Multiple 4-ft wide Bands:1. Apply epoxy to laminate2. Wrap around column (min. 2 wraps + 8)3. Use ratchet straps as temporary support4. Fill annular space with grout or resin (hydrostatic pressure of
filler pushes the two layers together)5. Repeat steps with next 4-ft wide band & provide overlapping
joint with prior band
B) Single Continuous Spiral:1. Cut laminate into 12-inch wide very long strips2. Spirally wrap around column while apply epoxy on
overlapping portion3. Use ratchet strap to secure the end4. Fill annular space
Shape of the Jacket
Shell does not have tobe cylindrical.
This is a 36 X 36column with 1.5 PVCpipes used as spacers.
Comparison with Commercially-Available FRP Forms
3-4 times stronger than steel (62-155 ksi)
No weak seams along the sides
Provides structural confinement
Increases axial capacity beyond original strength
Grout can be pressurized to fill all voids and cracks
No custom manufacturing one size fits all
Annular space adjusted in field to minimize grout vol.
Comparison of Tensile Strength withConventional Jackets
24000
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
10000
24000
0
5,000
10,000
15,000
20,000
25,000
30,000
Tensile
Stren
gth
(psi)
18
PileMedic for Encapsulation ofUnderwater Piles
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Effect of Confining Pressure
Confined
Strain (%)0 0.2 0.4 0.6 0.8 1.0
Stress
fc
Unconfined
Design Example: Florida Submerged PilesDesign Data:
12x12 inch pile
fc = 4000 psi
Ignore reinforcing steel
Pn = 0.85 fc (12x12) = 490 kips
Encapsulated Pile:
18 inch diameter
Fill with 4000 psi grout490
865
1639
0
600
1200
1800
Pil e Ordi nary J acket Pi leMedic
774 k due toconfinement
18
12
12
Same pile repaired with PLC150.10 PileMedic,Pn = 1639 kips
Repair of Underwater Piles without divers
22
Utility Pole Repair
Repair of Corrosion-DamagedSteel Columns
2324
Repair of Corroded Bridge Piles
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