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TACKLING ABC PROJECTSSPOTLIGHT ON SHRP2 RO4
GILA RIVER / SACATON ROAD BRIDGEA DESIGNER’S PERSPECTIVE
Webinar presentation:ABC-UTC at Florida International University (FIU)
January 18, 2018 1:00p-2:00p ESTMark A. Chase, PE
AZTEC Engineering Group, Inc.
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Collaboration
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Agenda• Where (Project Location / Vicinity)• What (The A,B,C’s)
– Existing & New Bridge– Reasons for Project
• How (The 1,2,3’s)– Design – The Beginning and A New Door…– The Low-Tech Slide System
• Why (The $’s)• A Designer’s Perspective• Questions
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Where (Location)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Where (Vicinity)
Gila River“1-Mile Wide,1-Foot Deep”
Sacaton, AZ
Bridge Site
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Where (Vicinity)
Gila River“1-Mile Wide,1-Foot Deep”
Sacaton, AZ
Bridge Site
Photo Courtesy of Gila River Indian Community – www.gilariver.org
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
What (A,B,C’s)Existing Bridge (H145)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
What (A,B,C’s)Existing Bridge (H145)
• Completed 1961– Replaced original timber bridge
• 4 x 35’ spans – Total Length ~ 140’– 45 Degree Skew
• CIP slab on precast rectangular beams– Plan Alternative – Conventional & Prestressed
• Steel H-Piling (Very Shallow)– Solid Pier Walls and Pile Cap Abutments
• No Approach Slabs or Expansion Joints
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
What (A,B,C’s)New Bridge (H144)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
What (A,B,C’s)New Bridge (H144)
• Completed Spring 2015– Replaced original concrete slab bridge
• 2 x 70’ spans – Total Length ~ 140’– 15 Degree Skew
• CIP slab on PC/PS AASHTO Type III-Mod• Abut/Pier Caps on Drilled Shafts• Semi-Integral Abutments and Approach Slabs• Expansion Joint – At Pier
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
What (A,B,C’s)Reasons for Project
• Roadway Safety• Roadway Overtopping• Sufficiency Rating
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Roadway Safety
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Roadway Safety
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Roadway Overtopping
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Roadway Overtopping
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Roadway Overtopping
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Sufficiency Rating
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
• Conventional RFQ / Consultant Selection– Preliminary Engineering / Scoping - 2011– Final Design Phase - 2012
• Design – Bid – Build• Evaluated Typical Bridges & Methods
– Typical Boundary Conditions• No temporary supports in the river• Typical DOT Design & Construction Methods• In our Bridge Selection Report we mentioned ABC• Maintain Traffic ( selected “Approved” Detour)
– phased construction, shoofly detour, full closure alternatives
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
AADT ~5100
6-MilesEach Way
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
6-MilesEach Way
AADT ~5100
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
AADT ~5100
6-MilesEach Way
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
• Finalized PS&E Package, Clearances, Etc.– Bid Ready
• Challenges Remained…Or Opportunities?– Funding
• Budget ~$2 million < Estimate ~$2.7 million– Maintenance of Traffic
• 4-6 Month Detour remained a concern
• A New Door Opened…
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Design - The Beginning
• Finalized PS&E Package, Clearances, Etc.– Bid Ready
• Challenges Remained…Or Opportunities?– Funding
• Budget ~$2 million < Estimate ~$2.7 million– Maintenance of Traffic
• 4-6 Month Detour remained a concern
• A New Door Opened…
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)…A New Door Opened
• SHRP2 Grant (ABC Toolkit/Techniques)– Opportunity for funding of ABC approach– Opportunity to improve Maintenance of Traffic– Opportunity to accelerate Construction– Grant Received Fall 2013 - $500K
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)…A New Door Opened
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)…A New Door Opened
• SHRP2 Grant (ABC Toolkit/Techniques)– Opportunity for funding ABC Approach– Opportunity to Improve Maintenance of Traffic– Opportunity to Speed Construction– Grant Received Fall 2013 - $500K
• Construction Manager/General Contractor (CMGC)– Also known as Construction Manager at Risk (CMAR)
• Contractor selected by Owner based on Qualifications• Guaranteed Maximum Price Negotiated with Owner
– CMGC RFQ / Selection Spring/Summer 2014– FNF Construction Inc., Phoenix, AZ
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)SHRP2 Toolkit & CMGC
• Worthy of separate Presentations on their own• Key Element of this Project’s success
– Applied FNF’s Construction Methods and Expertise• Lateral Slide was first for entire Project Team• Local, Available Tools / Equipment / Techniques• Keep it Simple
– Construction Cost Modeling vs. Engineering Estimates– Risk Identification During Design (Most Important)– Revisited ENTIRE Design
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)SHRP2 Toolkit & CMGC
• Revisited ENTIRE Design – Some Key Items– 15 degree skew / shift bridge North
• Construct new substructure under existing bridge & across existing road, outboard foundations
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)SHRP2 Toolkit & CMGC
• Revisited ENTIRE Design – Some Key Items– 15 degree skew / shift bridge North
• Construct new substructure under existing bridge & across existing road, outboard foundations
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)SHRP2 Toolkit & CMGC
• Revisited ENTIRE Design – Some Key Items– 15 degree skew / shift bridge North
• Construct new substructure under existing bridge & across existing road, outboard foundations
– Minimize Temporary Works• Reduce “Throw-Away”• Mitigate Risk of River Flows
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Skew/Shift Substructure
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Skew/Shift Substructure
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Skew/Shift Substructure
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Temporary Works Cost Money and Time• Temporary Works in River add Risk
– When will the river flow?– Can we mitigate?– Who owns the risk financially?
• Keep it Simple• Use available tools vs. buying/making expensive new ones
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Temporary Support (Pier)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Temporary Support (Pier)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Temporary Support (Pier)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Permanent “Temporary” Support (Abutment)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Permanent “Temporary” Support (Abutment)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
• Permanent “Temporary” Support (Abutment)
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)Minimize Temporary Works
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
• Keep it Simple
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How (1,2,3's)The Low-Tech Slide System
• Keep it Simple
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
• Keep it Simple
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
• Theoretical (Steel-Steel)– Friction (Static/Kinetic)
• Various Sources– Greasy = 0.1/0.05– Plain = 0.78/0.45
• Actual (Steel-Steel)– Friction (Static/Kinetic)
• Greasy 0.25/0.15
• Take-Away– Plan for higher friction (2x
to 3x)– This is not an operating
room…the grease gets dirty just by the wind and air
– Rusty Steel is “sticky”
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
• Theoretical (Steel-Steel)– Forces (Static/Kinetic)
• 4-Girder Element– 265K (Reaxn)– 26.5k / 13.25k
• Actual (Steel-Steel)– Forces (Static/Kinetic)
• 4-Girder Element– 258K (Reaxn)– 63K / 36k
• Capacity – 300k
• Take-Away– Plan for higher forces– Planning with excess
capacity is less expensive than finding out you don’t have enough
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
• Why no “Guides”– No Potential for Binding– Higher friction will control
bridge…won’t “blow away” on its own
• Plan B– Longitudinal Jacking
System– “Steering”
• Take-Away– It Worked…
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How (1,2,3's)The Low-Tech Slide System
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
P1
P2
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How (1,2,3's)The Low-Tech Slide System
P1 P2
P3
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How (1,2,3's)The Low-Tech Slide System
• Expansion Joint at Pier, Abutments Pinned
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How (1,2,3's)The Low-Tech Slide System
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How (1,2,3's)The Low-Tech Slide System
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Why ($'s)• Some Quick “Figures”
– Total Project Capital Cost (GMP) – $2.7M• $1.1M Bridge = $125/sf
– ABC Costs - ~$0.4M (15%)– Included Allowances/Enhancements - ~$0.3M (8%)
• Paint the Bridge• Add more bank protection• Contingency/Items – River Flows
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Why ($'s)• Traffic Impact
– 9 days + 1 weekend vs. 4-6 Months• 14-22 week Saving
– 700K vehicle miles vs. 6M to 9M• 5M to 8M vehicle miles savings
– 3 hours vs. 24 to 36 hours user time• 21 to 33 hours savings per roadway user
– $0.4M vs. $0.9M to $1.4M• ABC Cost vs. Fuel Only Cost• Savings $0.5M to $1.0M
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
One Designer’s Perspective• ABC = Accelerate Bridge Construction
– Contractor’s input and buy-in is essential for success– CMGC made this possible for this project
• Tailor the complexity to the project – Keep it Simple– Fundamental engineering principles really do work– Use existing tools in new ways
• ABC was once “exotic”, Today it’s everyday– As Engineers, we have been trained to be conservative,
methodical and to think things through, this is ABC– Bridge Design, for me is more about the Bridge Construction
because that is the final measurement of what we accomplish
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Time-Lapse Video Link• Time-lapse Video – AZTEC Engineering on YouTube
– Sacaton Bridge Replacement – Accelerated Bridge Construction– https://youtu.be/Auuq_otR6BY
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QuestionsPamela Hutton, PESHRP2 Implementation [email protected]
Mark Chase, PESenior Vice PresidentAZTEC Engineering Group, [email protected]
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Abutment/Approach Slab
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Expansion Joint at Pier
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Deck Closure Pour
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Diaphragm Closure Pour
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Internal Shear Key
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Internal Shear Key
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Gila River / Sacaton Road BridgeA Designer’s PerspectiveJanuary 18, 2018
Modified AASHTO Type III