Download ppt - HASTINGS TIED ARCH BRIDGE | REDUNDANCY AND SERVICE LIFE Delivering Major Minnesota Bridges Hastings Bridge Design Build Project Redundancy and Service

HASTINGS TIED ARCH BRIDGE | REDUNDANCY AND SERVICE LIFE

Delivering Major Minnesota Bridges

Hastings Bridge Design Build ProjectRedundancyand Service Life

March 5, 2013 Vincent Gastoni, PE

MnDOT – ACEC/MN Annual Conference

Leading Together-Innovative Solutions for an Evolving Industry


Project Location Map

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Base Map Source: Google Maps


Project Overview - Existing Bridge

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• Project replaces 1950 steel arch truss

• Lowest 1% in the state for overall sufficiency

• Highway 61 over Mississippi River

• Highest daily two-lane highway traffic volume in the state

• MnDOT Chapter 152 Bridge


Project Overview - Aerial Plan

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Project Overview - Design-Build Process

• Design-Build SOQ Issued: October 2009

• Design Build Selection: June 2010

• MnDOT identified two acceptable alternatives

• RFP allowed Alternative Technical Concepts (ATC’s)

• Design Build Team:

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INNOVATIVE RFP FEATURES

• Alternative Technical Concepts (ATC’s)– Allow innovation and flexibility

• Pre Approved Elements (PAE)– Reduce risk and provide best value opportunities

o Redundancy Concepts for the Main Structure Segmento Scour Analysis Methodo Bridge Fixity and Thermal Expansion of Bridge No. 19004o Refined Analysis Method

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TECHNICAL PROPOSAL SCORING

• Bridge 34 Points

• Environmental Management 6 Points

• Maintenance of Traffic 5 Points

• Public Communications 2 Points

• Schedule 3 Points

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TECHNICAL PROPOSAL SCORING

• Bridge 34 Points

– Durability/Quality of Bridge No. 19004 13 Points

– Inspection/Maintenance 9 Points

– Geotechnical 5 Points

– Erection of Bridge No. 19004 4 Points

– Demolition of Bridge No. 5895 3 Points

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SCORING DRIVES INNOVATION

• Selection =

Bid Price Technical Score


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• Selection =

• Win Strategy=


Minimize Bid PriceMaximize Technical Score


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• Selection =

• Win Strategy=

• Use innovative ATC’s & PAE’s to:– Minimize Risks– Optimize Design Solution


Minimize Bid PriceMaximize Technical Score


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Need A Better Mouse Trap


Design-Build Process – Base Concepts

MnDOT RFP Baseline Options

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MnDOT Cable Stayed Option

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MnDOT Arch Option

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Base Concept Evaluation

• Evaluate Base Designs

– Preliminary engineering analysis

– Cost estimating exercises

• Produce Comprehensive Evaluation Matrix Tool

– Material costs & risks

• Develop Alternative Designs

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Innovation – Develop Alternatives

• Evaluate Alternative Designs

– Prescriptive design/performance criteria

– Aesthetic requirements

– Technical scoring criteria

– Cost & schedule impacts

• Add to Comprehensive Evaluation Matrix Tool

• Develop Overall Best Value Technical Approach

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Lunda/Ames-Parsons Alternatives

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•

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•

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Innovative Winning Alternative

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Project Architect: Bradley Touchstone, Touchstone Architecture

• Successful Proposal-Free Standing Tied Arch $120M

• 545 ft. Main Span


Innovative Winning Alternative

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Project Architect: Bradley Touchstone, Touchstone Architecture


Visual Quality Process & Color Selection

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Aesthetic Lighting

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Lighting Design: Illumination Arts


Innovative Features - Concrete Tie

• Best value solution

• Higher level of redundancy

• Ease of inspection/maintenance

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• More durable than steel box

• No shop assembly and fit-up issues

• Active tension control


Innovative Features - Concrete Knuckle

• Framed into pier and rib

• Improved durability/fit-up

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• Post-tensioned anchorage

• Highly redundant


Innovative Features – Steel Box Arch Rib

• Aesthetically pleasing

• Improved maintenance

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• Simplified fabrication

• Best Value solution


Innovative Features - Floor System Redundancy

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Innovative Features - Erection

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• Build low

TEMP TIE & FORMS

TEMP BRACING

FLOOR SYSTEM

ARCH RIB

TEMP LIFTING CONNECTION



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• Build Low On Land

TEMP TIE & FORMS

TEMP BRACING

FLOOR SYSTEM

ARCH RIB

TEMP LIFTING CONNECTION



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• Build Low On Land


Erection

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• Move onto Barges Using SPMT’s



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• Move onto Barges Using SPMT’s



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• Float



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• Float



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• Skid



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• Skid



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• Skid



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• Lift



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• Lift



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• Lockoff



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• Get Some Sleep


Other Innovative Features

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• Column Supported Embankment

• Long Span Precast Concrete Beams



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COLUMN SUPPORTED EMBANKMENT• 4” over 25 years• CSE -10’x10’ Pile Grid• Conc. Caps• Sand/Geogrid



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LONG SPAN PRECAST BEAMS

• Precast Pretensioned Concrete Beams

• 5 Spans of 9-Girder Lines

• 173’-7” Long Span

• Longest Beam Overall length = 174’-3”

• Innovative beam design became the basis of MnDOT’s new MW Long Span Precast Concrete Beam Standards



Photos: Joel Mich, Cretex

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Photos: Joel Mich, Cretex

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Summary

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• Innovative RFP Process

• Best Value Approach Drives Innovation

• MnDOT Partnering in Innovation

• Continued Commitment to Innovation


Thank You

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