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Truss Retrofit to Mitigate

Substructure Displacements atI-20 Mississippi River Bridge

at Vicksburg

Zolan Prucz, Ph.D., P.E.,

Modjeski and Masters, Inc.

New Orleans, LA

2013 Louisiana Transportation EngineeringConference

Baton Rouge, Louisiana

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Burns Cooley Dennis, Inc. Dr. James H. May and Dr. Richard J. Lutten

Lazenby and Associates, Inc.

Boh Brothers, LLP C.E.C., Inc.

LADOT Headquarters and District

FHWA

Ardaman & Associates, Inc. and their Teamof Experts

Acknowledgements:

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W-1

E-1

E-2

E-3

PP15

PP15

US 80

I-20

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E-1

E-2

E-3

Pier-2

Pier-1

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Pier-2

Pier-1

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Pier E-2

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426 423 870 423 426

W-3 W-2 W-1 E-1 E-2 E-3

PP15 PP15

E E EF F EFF F

SuspendedSpan AnchorSpan SimpleSpanSimpleSpan AnchorSpan

EastWest

Cantilever

Spans

Bridge Characteristics

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Original Bearings

E-2 E-3E-1

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PP15

PP15

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Truss Elevation View at PP15

EAST

L14 L15

TRUSS ELEVATION VIEW AT PP15

L16

SUSPENDED SPANCANTILEVER SPAN

WEST

U14

U15 U16FALSE CHORD U15-U16

FALSE CHORD L14-L15

SUSPENDED

SPAN

HANGER

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Top Lateral System at PP15

SUSPENDED SPANCANTILEVER SPAN

U14 U15

TOP LATERAL SYSTEM AT PP15

U16

EASTWEST

FALSE CHORD U15-U16

FALSE CHORD U15-U16

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CANTILEVER SPANSUSPENDED SPANSUSPENDED SPANCANTILEVER SPAN

EAST WEST

L14 L15 L14L15L16

PP15 PP15

BOTTOM LATERAL SYSTEM AT PP15

L16

LONGITUDINAL

STRUT

BOTTOM LATERAL SYSTEM AT PP15

Bottom Lateral System at PP15 and PP15

FALSE

CHORD L14-L15

FALSE

CHORD L14-L15

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Long Strut

Stringer PP 15PP 14

Jointmeter

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PIER E-3U 15

EXP DAM AT PP 15 EXP DAM AT PIER E-3

Bridge Condition After 2000 / 2001 MovementsBEARINGS E-3

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Channel Migrations

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U.S. Route 80 Bridge

I-20 Mississippi River Bridge

F

PIER 3

E

F

F

EE

E F E

PIER 2 PIER 1TOWER 1ER DR

E-1 E-2

E-3

E

AR

BRCR

-70-75

7

-46

18

75

158

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Bridge Instrumentation

PP15

Location of Tiltmeters

Location of Jointmeters

Location of Datalogger PP15

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(in) (arc-sec) (in) (arc-sec)

1. 1999 and 2000 Prior to 5/2001 6.00 6.50

2. 2003 Feb2/5/2003 to

2/6/20030.50 50 0.50 0

3. 2005 Aug 8/2/2005 0.75 0 0.50 50

4. 2005 Nov 11/17/2005 0.25 0 0.25 0

5. 2006 Aug - Sep8/13/2006 to

9/21/20060.50 50 0.75 75

6. 2007 Sep - Dec9/21/2009 to

12/19/20070.50 50 0.50 25

7. 2009 Sep - Dec0/28/2009 to

12/22/20090.20 25 0.00 20

8. 2010 Nov 11/7/2010 to11/22/2010 0.20 25 0.00 10

9. 2011 Oct10/20/2011 to

10/24/20110.25 0 0.25 25

10. 2012 June - Dec6/29/2012 to

12/21/20121.50 75 1.25 75

10.75 300 10.50 300Total Movement (+/-)

Summary of I-20 Bridge Pier Movements

Top of Pier E-1Top of Pier E-2

Estimated Time or Time Period

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PP-15: Jointmeter Readings

Starting 8/27/2004; Updated 2/02/2013

-5.00

-4.00

-3.00

-2.00

-1.00

0.00

1.00

8/27

/200

4

12/7/200

4

3/21

/200

5

7/6/2005

10/29/20

05

2/26/200

6

6/24/200

6

10/6/200

6

1/14/200

7

4/24

/200

7

8/2/20

07

11/10/20

07

2/18/200

8

5/28

/200

8

9/5/2008

12/14/20

08

3/24

/200

9

7/2/2009

10/10/20

09

1/18/201

0

4/28/201

0

8/6/20

10

11/14/20

10

2/22

/201

1

6/2/20

11

9/10/201

1

12/19/20

11

3/28

/201

2

7/6/20

12

10/14/20

12

1/22

/201

3

PierTilt(arc-sec)

-10

0

10

20

30

40

50

60

RiverStage

(feet)

E-3: Jointmeter Readings

Starting 8/27/2004; Updated 2/02/2013

-1.00

-0.50

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

8/27/200

4

12/7/200

4

3/21

/200

5

7/6/2005

10/29/20

05

2/26/200

6

6/24

/200

6

10/6/200

6

1/14/200

7

4/24

/200

7

8/2/20

07

11/10/20

07

2/18/200

8

5/28

/200

8

9/5/2008

12/14/20

08

3/24

/200

9

7/2/20

09

10/10/20

09

1/18/201

0

4/28/201

0

8/6/20

10

11/14/20

10

2/22

/201

1

6/2/20

11

9/10/201

1

12/19/20

11

3/28

/201

2

7/6/20

12

10/14/20

12

1/22/201

3

PierTilt(arc-se

c)

-10

0

10

20

30

40

50

60

RiverStage(fe

et)

Joint

Opening at E-3

Joint

Closing at PP15

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Pier E-3: Jointmeter Readings vs. River Stage

Started 1/4/2003; Updated 3/10/2003

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

0:00

1/4/2003

0:00

1/14/2003

0:00

1/22/2003

0:00

1/31/2003

18:00

2/8/2003

18:00

2/16/2003

12:00

2/24/2003

12:00

3/4/2003

JointmeterReading(in)

0

5

10

15

20

25

30

35

40

45

Gageheight(ft)

Difference Between Measured and Calculated Expansion Readings for 419.38' Span

River Stage

2/4

2/7

February 5-6, 2003 Movement of Piers E-1 and E-2

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June 22, 2003 Longitudinal Strut Damage

PP 15

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2004 Bridge Modifications (Remedial)Contractor: Boh Bros., Constr. Company, LLC.

2010 Bridge Modifications (Proactive)Contractor: C.E.C. Inc., David Huval Jr.

426 426 423 870 423426 426

W-5 W-4 W-3 W-2 W-1 E-1 E-2 E-3

PP15 PP15

E E E E EF F F EFF F

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2004 Bridge Modifications

Measure 1

Measure 2

Measure 3

PP15PP14

PP15 PP14

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Summary of 2004 Bridge Modification Measures

Shorten span between Piers

E-1 and W-1.

Repair longitudinal strut L15-L14.

Eliminate locked-in

stresses between Piers

E-1 and W-1.

3

Widen top of pier area.Add catch blocks under the

trusses.

Prevent Span E-2 E-3drop at Pier E-3.

2

Replace expansion dam at

Pier E-3.

Prevent roadway traffic

hazard at expansion dam

at Pier E-3.

1

RetrofitObjectiveMeasure

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EXISING CONDITION

E-3

E-3

Expansion Dam Modifications at Pier E-3

EXPANSION DAM MODIFICATION

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Expansion Dam at Pier E-3 After Modifications

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E-3

Pier E-3 Modifications

EXISING CONDITION

MODIFICATION OF PIER E-3

AFTER MODIFICATIONS

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PP15

PP14

Opening of Expansion Dam at PP15

by Jacking Span PP15-PP14

Towards PP14

Shortening of Span Between Piers E-1 and W-1

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EXISTING CONDITION

PP 15

PP 14

PP 14

Shortening of Span L14 L15

SHORTENING OF STRINGERS

BETWEEN L14 AND L15

SHIFT AFTER CUT

CUT OUT

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PP 14 AFTER SPAN SHORTENING EXPANSION DAM AT

PP 15 AFTER SPAN SHORTENING

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Truss False Chord Modifications at U15 U16

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Longitudinal Strut Shortening at Span L14 L15

PP14

PLAN - PANEL POINT 14

MODIFICATION OF LONGITUDINAL STRUT

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Longitudinal Strut Repair at Span L14 L15

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PP 15 E-3

PP 15

Deck Joints After 2004 Repairs

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Measure 5

Measure 2

Measure 3

Measure 4

Measure 1

PP15

PP14

PP15PP14

2010 Bridge Modifications for Increased Movement Capacity

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Summary of 2010 Bridge Modification Measures

Add eyebars at each suspended

span hanger.

Provide redundancy to the

suspended span hangers.

5

Replace bearings at E-3 and E-2

with inverted sliding disc

bearings.

Increase movement capacity

at bearings at Piers E-3 and

E-2.

2

Widen top of pier area at E-2

and E-1. Add bearing blocks atE-2 and E-1.

Prevent span drop at Pier E-2

and E-1.

4

Shorten span PP14-15 and

replace expansion dams at Pier

E-2 and PP15.

Increase movement capacity

within the deck, between Pier

E-1 and W-1.

3

Replace expansion dam at Pier

E-3.

Increase movement capacity

of expansion dam at Pier E-3.

1

RetrofitObjectiveMeasure

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Expansion Dam Replacement at Pier E-2

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Bearing Replacement at Pier E-3

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Bearing Replacement at Pier E-2

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E-2E-3

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PP 14

Shortening of Span L14 L15

SHORTENING OF STRINGERS

BETWEEN L14 AND L15

SHIFT AFTER CUT

CUT OUT

PP14

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PP14

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PP14

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PP15

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PP15

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Expansion Dam Replacement at PP15

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PP 14 AFTER SPAN SHORTENINGEXPANSION DAM AT

PP 15 AFTER SPAN SHORTENING

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False Chord Adjustments at U15 False Chord Modifications at U15

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Widening of Pier Top Area at Pier E-1

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Addition of Eyebars to the Suspended Span Hangers at PP15 and PP15

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PP 15

E-3

E-2

Deck Joints After 2010 Modifications

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Remedial Structural Modifications

Proactive Structural Modifications for: Anticipated movements

Extreme scenarios

Summary

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Thank you!