Saat Ciog Lu

8/13/2019 Saat Ciog Lu

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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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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)


Repaired

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100

Load(

kN)


Control

Repaired

Retrofitted Companion Specimen

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100

Load

(kN)


Retrofitted

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100

Load

(kN)


Control

Retrofitted

Comparison of Column Specimens

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100

Load

(kN)


Control

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100Load

(kN)


Repaired

-100

-60

-20

20

60

100

-100 -60 -20 20 60 100Load

(kN)


Retrofitted

FRP Laminates are effective inrepair & retrofit of cols.

Multi-Layered SuperLaminate(Patent Pending)

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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

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Utility Pole Repair

Repair of Corrosion-DamagedSteel Columns

2324

Repair of Corroded Bridge Piles


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