of 82
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Extradosed Prestressed BridgesSteven L. Stroh, PhD, PE, SE
Vice President
Deputy Director of Surface Transportation Major Bridges
URS Corporation, Tampa, FL
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
AGENDA
The Extradosed Bridge Concept
Representative Extradosed Bridges
Key Proportioning Parameters and Design
Considerations
Case Study
Concluding Remarks Questions
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
What is an Extradosed Prestressed Bridge?
Odawara Port Bridge, Japan (1994)
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Defining an Extradosed BridgeJacques Mathivat , Journal of FIP, 1988
Recent Developments in Prestressed
Concrete Bridges
Tower height is the defining element
Cable Stayed 1/5
Extradosed 1/15
Extradosed Prestressing
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Characteristics of an Extradosed Bridge
Shorter tower than cable stayed
Shallower girder than a girder bridge, but deeper than a
cable stayed bridge
Flatter cables than a cable stayed bridge, and only over
a portion of the span.
Cables sized to prestress the deck
Low fatigue ranges for cables
Uniform size range for cables
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Girder Depth to Span
1:16 to 1:18 (at support)
Girder Bridge
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Girder
depth:
5 to 6 ft.
Tower
height to
Span:
1:4
V
H
Cable-Stayed Bridge
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Girder Depth
to Span:
1:30 to 1:35
Tower Heightto Span:
1:10 to 1:15
ExtradosedPrestressed
Bridge
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
More than 60 ExtradosedBridges World-wide
More than 30 in Japan More than 25 countries have at least one
Currently 3 in the U.S.
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Progression of Extradosed Bridge Construction
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Representative
Extradosed Prestressed
Bridges
11
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Odawara Port Bridge, Japan (1994))
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Tsukuhara Bridge, Japan
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Okuyama Bridge, Japan
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Miykodogawa Bridge, Japan
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Kiso and Ibi River Bridges, Japan
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Rittoh Bridge, Japan
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Sunnibergbrucke, Switzerland
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Golden Ears Bridge, Vancouver, BC
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Introduction
First U.S. Extradosed Bridge
Pearl Harbor Memorial Bridge, New Haven CT
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
I-35 bridges over the Brazos River in Waco, Texas
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Image Courtesy MnDOT
St Croix River Bridge, Minnesota - Wisconsin
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Special Case Bridges (Non-Extradosed)
Barton Creek Fin-Back Bridge Ganter Bridge, Switzerland
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Key Proportioning Parameters andDesign Considerations
Span Lengths
Side Span Ratios Multi Span Bridges
Tower Height
Girder Depth/Haunch Bridge Width
Aesthetic Opportunities
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Economical Bridge Types
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Economical Bridge Types
200 900Extradosed
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Side Span/Main Span Ratio
Girder Bridges
Cast on falsework:
L1/L = 0.8
Balanced Cantilever:L1/L = 0.65
Cable Stayed Bridges
Steel
L1/L = 0.35
Concrete
L1/L = 0.42
Extradosed Bridges
Mean L1/L Ratio = 0.57
One Std. Deviation = 0.45 to 0.69
Use L1/L = 0.6
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Backstay Cable
Consideration of Multi-Span Cable-Stayed Bridges
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Multi-Span Cable-Stayed Bridges
Population of 1200 bridges
Number of multi-span CS Bridges = 7
Rion-Antirion Bridge,
Greece
Ting Kau Bridge,Hong Kong
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Multi-Span Extradosed Bridges
Population of 63 bridges
Number of multi-span Extradosed Bridges = 19
Kiso and Ibi River Bridges, Japan
Fl id
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Tower Height Expressed as H/L H = tower height
L = Main Span Length
For Cable Stayed:
H/L 1/4 to 1/5
For Extradosed:
H/L 1/10
Fl id
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Span/Depth Ratios for Extradosed Bridges
For Girder Bridges:
Constant Depth: S/D 22
For Variable Depth:
S/D 17 at pier S/D 50 at mid-span
For Cable Stayed Bridges:
Range of depth/span
50-250
For Extradosed Bridges:
S/D 30 at pier
S/D 50 at mid-span
Fl id
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Typical Proportioning ParametersExtradosed Bridges
Applicable Span Range: 200-900 ft.
Side/Main Span Ratio: 0.6
Tower Height/Span Ratio: 1:10
Span/Girder Depth Ratio:
Midspan 1:50
At Tower 1:30 Applicable to multi-span bridges
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Aesthetics General Structural Arrangement
Single Cable Plane Twin Cable Plane Three Cable Planes
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Aesthetics Stay Cable Arrangement
Fan Cable Arrangement Harp Cable Arrangement
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Aesthetics Towers Arrangement/Shape
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Case Study
Pearl Harbor Memorial Bridge, New Haven CT
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Project Overview
Pearl Harbor Memorial Bridge (PHMB)
38
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Opened - 1958
Main Span 387 ft.
Longest Plate Girder Spanin Western Hemisphere
Existing PHMB
39
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
40
Designed for 40,000 VPD
Currently over 140,000 VPD
Functionally and Structurally Deficient
Existing PHMB
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
Replacement Bridge
41
Increase from 6 lanes to 10 lanes
Improved Safety
Improved Navigation
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Florida
Department of
Transportation
42
Why an Extradosed Bridge for the PHMB? Longer Span Desired for Navigation
Tower Height Restricted by Tweed Airport
Girder Depth and Profile Controlled by Adjacent Interchange
Economical Bridge Desired
Bridge Worthy of Pearl Harbor Memorial Bridge Designation wasDesired
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
43
Side Span / Main Span Ratio
248.5/515.0/248.5 = 0.48 Ratio
Recommended Ratio = 0.6Typical Range = 0.45 0.69
Resulting Uplift = 570 kips (5% of the max. reaction)
Counterweight Provided
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
Bridge Deck WidthGirder Cross Section
Overall Roadway Width Varies 190-215 feet
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
Deck Depth / Haunch Arrangement
Recommended Span/Depth
At Tower = 25-35
At midspan 50
Provided Span/Depth At Tower =31.4 (16.4 depth)
At midspan = 45
(11.5 depth)
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
46
Superstructure Cross-Section
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
47
Transverse Post-Tensioning
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
Tower Height
Suggested L/H = 10
Selected 60 ft. tower
height
L/H = 8.6
Wide Heavy Deck
Limit Fatigue
Demand on Stays
Pearl HarborMemorialBridge
Florida
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
49
Tower Elevation
Florida
f
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
50
Anchor Pier Elevation
Florida
D t t f
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
0.6 (15mm) Grade 270 Strand
Greased and Individually Sheathed
Co-extruded PE pipe
Jacked Strand-by-Strand at tower
Stay Design Stresses
- 0.55 fs for AASHTO Group I
- 0.60 fs other Load Groups
- 0.60 fs construction or stay replacement
Stay Cable Design Criteria
51
Florida
D t t f
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
52
Erection
Florida
D t t f
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
Form Traveler Construction
53
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
54
Main Span Construction Sequence
54
Stage 1 - Construction of Substructures and Pier Tables
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
55
Main Span Construction Sequence
55
Stage 2 - Assembly of Traveling Forms
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
56
Main Span Construction Sequence
56
Stage 3 - Balanced Cantilever Construction and Cable Installation
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
57
Main Span Construction Sequence
57
Stage 4 - Continuation - Cantilever Construction
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
58
Main Span Construction Sequence
58
Stage 5 - Closure at Side Span
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
59
Main Span Construction Sequence
59
Stage 6 - Closure at Main Span
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
60
Main Span Construction Sequence
60
Stage 7 - Finishing Works
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Department of
Transportation
Aesthetics
61
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
p
Transportation
62
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
p
Transportation
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
p
Transportation
64
Superstructure weight (ea. deck)= 54.2 klf
Equivalent concrete depth for girder = 3.4
Longitudinal Post-Tensioning= 11 psf
Transverse Post-Tensioning= 0.9 psf
Weight of stay cables= 3.5 psf
KEY BRIDGE PARAMETERS AND QUANTITIES
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Contract B1
Contract Award: April 2008
Owner:
ConnDOT
Contractor:
Cianbro/Middlesex JV III
Designer:
URS
Program Manager:
Parsons Brinckerhoff
CE&I:
Prime: Lochner
Sub: FIGG
Original Contract Value: $137,494,973
Final Contract Value:
$136,385,903
Final Completion Date
August 18, 2011
34 days early
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Contract B
Contract Award:
July 2009
Owner:
ConnDOT
Contractor:
Walsh/PCL JV II
Designer: URS
Program Manager:
Parsons Brinckerhoff
CE&I:
Prime: Lochner
Sub: FIGG
Original Contract Value:
$416,691,984
Current Contract Value:
$416,805,470
Current Completion Date
June 30, 2015
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
67
Tower Foundations: Drilled Shafts
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Tower Foundations
Florida
Department of
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Tower Construction
Florida
Department of
T t ti
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Bridge Bearings
Florida
Department of
T t ti
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Tower: Stay Anchor Box
Florida
Department of
T t ti
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Pier Table Construction
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Pier Table Construction
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Out-of-Balance Supports
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Balanced Cantilever Construction with Form Traveler
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Balanced Cantilever Construction
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Side Span - Main Span Closure
77
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Main Span Closure
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Northbound Bridge Opened 22June 2012
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
Transportation
Existing Bridge removed Southbound Bridge
Scheduled for June 2015 Completion
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
a spo tat o
Concluding Remarks
Extradosed Bridges
Extradosed Bridges are an Emerging Technology
Their practicality has been proven by numerous
prototype bridges constructed in more than 25countries
Economical in the 200-900 foot span range
Advantageous for Multi-span Bridges
Basic Proportioning Well Understood Stay Criteria Included in Latest PTI Specifications
Have Opportunities for Unique Visual Presentations81
Florida
Department of
Transportation
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F D O T D E S I G N T R A I N I N G E X P O
p
QuestionsQuestions
