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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!