Portland - Milwaukie Light Rail Willamette River Bridge ...WRBAC’s Direction to Design Team...

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Willamette River Transit BridgePortland - Milwaukie Light Rail Willamette River BridgeWillamette River Bridge Advisory Committee 05 28 09Willamette River Bridge Advisory Committee 05.28.09

Willamette River Transit Bridge

Bridge Type - Cost

Vertical Clearance

Bicycle – Pedestrian Path Width

Bridge Type - Cost

Willamette River Transit BridgeWillamette River Transit BridgeWRBAC’s Direction to Design Team

Cable Stay - Self Anchored Suspension (Hybrid)

1. Explore viability of CS-SAS (hybrid) during early PE

2 Advance Cable Stayed bridge type into preliminary engineering2. Advance Cable Stayed bridge type into preliminary engineering

Willamette River Transit BridgeHybrid

Ross Island

Marquam

St J hSt. Johns

Willamette River Transit BridgeHybrid – Positive AttributesSh t t h i htShorter tower height

R l ti hi t dj t b idHybrid – Positive AttributesRelationship to adjacent bridges

THybrid – Positive AttributesTransparency

Willamette River Transit BridgeWillamette River Transit BridgeExploration on Viability of HybridC t l D i W kConceptual Design Work

Hybrid - Refined

Hybrid - Initial

Team worked to advanced conceptual design to verify feasibility

Willamette River Transit BridgeWillamette River Transit Bridge

C t S i C blExploration on Viability of HybridCatenary Suspension Cable

Hybrid - Refined

Hybrid - Initial

Catenary Profile

Adjust size to use stay cable technology versus “spinning” in place

V ti l S d C blExploration on Viability of HybridVertical Suspender Cables

Hybrid - Refined

Hybrid - Initial

Eliminated those not needed for structural system

S C fi tiExploration on Viability of HybridSpan Configuration

Hybrid - Refined

830’

Hybrid - Initial

860’

Optimized span to move pier away from active river bank location

A h S tExploration on Viability of HybridAnchorage System

Hybrid - Refined

Hybrid - Initial

Optimize span to reduce length and weight of “drop-in” center span section

Hybrid - Refined

Hybrid - Initial

Optimize span to reduce length and weight of “drop-in” center span section to eliminate costly gravity – anchorage

Hybrid - Refined

Hybrid - Initial

Use typical deck – anchorage system

Willamette River Transit BridgeWillamette River Transit BridgeResults of Hybrid Analysis

Hybrid - Refined

Hybrid - Initial

Willamette River Transit BridgeWillamette River Transit BridgeWRBAC’s Direction to Design Team

Cable Stayed - 4 Pier

Cable Stayed - 2 Pier

2 Advance Cable Stayed bridge type into preliminary engineering• Work to combine best features of each to provide options

2. Advance Cable Stayed bridge type into preliminary engineering

Willamette River Transit BridgeWillamette River Transit BridgePE Work on Cable Stayed Type

Cable Stayed - Refined

Cable Stayed - Refined4 – Pier Attributes

• Piers in deeper water4 Pier Attributes

• Shorter span – more cost effective

2 – Pier Attributes• Cables between transit way and bicycle – pedestrians

• Match tower height of Hybrid at 180’ versus 254’ and 277’Hybrid Attributes

Willamette River Transit BridgeHow do the two types vary?

Hybrid - Refined

Willamette River Transit BridgeUrban Context

Hybrid - Refined

Tower heights are the same

Cable Stay - Refined

Willamette River Transit BridgeUrban Context

Hybrid - Refined

V-Tower illustrated

Could be an H-Tower

Willamette River Transit BridgeOther

Hybrid - Refined

Willamette River Transit BridgeQuestions?

Hybrid - Refined

Willamette River Transit BridgeCost Estimates

Hybrid - Refined

Willamette River Transit BridgeCost Estimate – Results

TriMet’s EstimatesTriMet s Estimates

Reviewed National Constructors Groups’ Backup

Adjusted labor costs, production rates, equipment costs, permanent and temporary material costs and contractor y

margin as needed per recent findings

Design Build Contractor EngineeringDesign Build Contractor Engineering

Cost to advance design from

Preliminary Engineering to Final Design

Cost for Contractor Construction Engineering

Design Build Contractor EngineeringDesign Build Contractor Engineering

Same percentage used for all types

Contingencies composed of three main items

Requirements Risk

Bid – Market Risk

Design Development Risk

Requirements Risk

Items know but not included in construction cost line

ExampleExample

Address water line

Bid – Market Risk

Factors affecting bid climate

ExamplesBridge complexity – Bidder experience

Number of bidders

Bid – Market Risk

National Constructors Group

Recommended $3 – 4 Million

More than a typical cable stayed type

Difference between estimating what is shown today

versus

Contractor bid prior to contract award

11.5% used for Cable Stayed

12.5% used for Hybrid given its unique nature

Costs that are different between alternativesCosts that are different between alternatives

Constructing closure section at Hybrid

Estimated to require an additional 4 monthsEstimated to require an additional 4 months

Extended owner overheadAdditional escalationAdditional escalation

Supplemental owner engineering

Totals in January 2009 values

Funding calculated with mid-point of construction values

Y f E dit (YOE)Year of Expenditure (YOE)

August 2013

January 2009 cost escalated to YOE values

E l d ibl t f t l l ti d i k k t $8 5 9 4MExcludes possible cost for steel escalation during peak market $8.5-9.4M

E l d ibl t f t l l ti d i k k t $8 5 9 4MExcludes interim financing cost $32.9 – 41.7MExcludes possible cost for steel escalation during peak market $8.5-9.4M

E l d ibl t f t l l ti d i k k t $8 5 9 4M

Annual cost to fund re-coating of steel drop-in section $90 - 110KExcludes interim financing cost $32.9 – 41.7M Excludes possible cost for steel escalation during peak market $8.5-9.4M

$139 M

Hybrid - Refined

$110 M

$139 M

Hybrid - Refined

$110 M

Bridge Type - Cost

Vertical Clearance

Willamette River Transit BridgeVertical Clearance Update

4.75%4.75%

Additi l l i ti l l t d iAdditional analysis on vertical clearance to occur during

Preliminary Engineering

Willamette River Transit BridgeVertical Clearance Presentations

• 5/4/09: FTA and US Coast Guard

• 5/7/09: River Users and Landside Stakeholders

• 5/13/09: Lower Columbia Region Harbor Safety Committee• 5/13/09: Lower Columbia Region Harbor Safety Committee

Assembled DataRiver levels

River users, vessel heights, river usage

January 29, 2009

Researched potential impacts of climate change

Climate Change Research FindingsClimate Change Research Findings• 1.9’ – 3.5’ increase due to flow by 2099

• Increases occur mainly during winter monthsy g

• Does not consider possible flow management mitigation - dams

Allowance added forAllowance added for

Safety and potential climate change impacts

Three feet was usedThree feet was used

Analysis done with and without allowance to determine implications

Data analyzed by month

D t l d f i b id h i ht lt tiData analyzed for various bridge height alternatives

4.75%4.75%

Additional analysis on vertical clearance would occur duringAdditional analysis on vertical clearance would occur during

Preliminary Engineering

Analyzed River DataAnalyzed a wide range of vertical clearance alternatives

• 65.00’

• 72.00’

• 80.00’

• 81.00’

• 75.00’

• 76.00’

• 77.00’

• 82.00’

• 83.00’

• 84.00’77.00

• 77.36’

• 78.00’

• 85.00’

• 90.00’

• 78.36’

• 79.00’

• 120.00’

Analyzed a wide range of vertical clearance alternatives

Analyzed River Data

• 65.00’

• 72.00’

• 80.00’

• 81.00’

• 75.00’

• 76.00’

• 77.00’

• 82.00’

• 83.00’

• 84.00’77.00

• 77.36’• 78.00’

• 85.00’

• 90.00’8 00

• 78.36’

• 79.00’

• 120.00’

Example

Portland Spirit’s Vessels

Air Draft: 58’ Air Draft: 44’

Columbia Gorge(Copied from: http://www.portlandspirit.com/sternwheeler.php

Portland Spirit(Copied from: http://www.portlandspirit.com/spirtech.php)

Results TabulatedNumber of days without passage by month

Totaled for each vertical clearance alternative

Amount of change between clearance options calculatedAmount of change between clearance options calculated

Results TabulatedSame process used for percentage passingp p g p g

Graphed percent passage in December

Results Analyzed

Graphed the change in % between clearances for December

Determine point of diminishing returnDetermine point of diminishing return

Vertical Clearance Alternatives AnalysisPortland Spirit's Columbia Gorge: 58' Air Draft

100.0%

0.0%65.00 72.00 75.00 76.00 77.00 77.36 78.00 78.36 79.00 80.00 81.00 82.00 83.00 84.00 85.00 90.00 120.0

Vertical Clearances

Change in Percent Passage Between Clearance Alternatives for December Percent Passing for December

100.0%

Graphed the change in % between clearances for December

0.0%65.00 72.00 75.00 76.00 77.00 77.36 78.00 78.36 79.00 80.00 81.00 82.00 83.00 84.00 85.00 90.00 120.0

Vertical Clearances

100.0%

100.0%90.0%

100.0%

Beyond 77.36’ there is

n C No Change

In % Passing

0.0%65.00 72.00 75.00 76.00 77.00 77.36 78.00 78.36 79.00 80.00 81.00 82.00 83.00 84.00 85.00 90.00 120.0

Vertical Clearances

Willamette River Transit BridgeVertical Clearance UpdateWith Th F t All f S f t Cli t Ch

Vertical Clearance Alternatives AnalysisWith Three Foot Allowance for Climate Change and Safety

Portland Spirit's Columbia Gorge: 58' Air Draft

With Three Foot Allowance for Safety – Climate Change

Portland Spirit s Columbia Gorge: 58 Air Draft

97.6%98.0%

98.7%98.9%

99.4%99.7%

99.8%100.0%

100.0%

100.0%91

100.0%

Beyond 77.36’ there is

Nominal Change

In % Passing

0.8%0 0%

0.0%65.00 72.00 75.00 76.00 77.00 77.36 78.00 78.36 79.00 80.00 81.00 82.00 83.00 84.00 85.00 90.00 120.0

Vertical Clearances

Change in Percent Passage Between Clearance Alternatives for December Percent Passing fro December

Draft FindingsAdditional vertical clearance provides diminishing benefit to existing commercial river users at about 77.36’

Willamette River Transit BridgeAnalysis of Landside Implications

Provide for stations at grade

Analyzed a wide range of vertical clearance alternatives• 65.00’ • 80.00’

• 72.00’

• 75.00’

77 36’

• 85.00’

• 85.00’ with ADA compliant ramps and landings

90 00’• 77.36’

• 78.36’

• 90.00’

• 120.00’

Plans De elopedPlans Developed

Implications Tab latedImplications Tabulated

Relative Landside Implications for Bridge Clearance Alternatives

$80,000,000

$60,000,000

$70,000,000

Costs used as a

to graphically illustrate the

$40 000 000

$50,000,000

to graphically illustrate the composite landside

implications analyzed

$30,000,000

$40,000,000

$10,000,000

$20,000,000

$075 77.36 78.36 80 85 90 120

Bridge Clearance Alternatives

$80,000,000

$60,000,000

$70,000,000

Beyond 77.36’

Landside Impacts Change from

$40 000 000

$50,000,000

ns Nominal to Significant

$30,000,000

$40,000,000

$10,000,000

$20,000,000

$075 77.36 78.36 80 85 90 120

Bridge Clearance Alternatives

Moderate to significant landside impacts for incremental g pincreases in bridge vertical clearance occurs at about 77.36’

Q ti ?Questions?

Bridge Type - Cost

Vertical Clearance

Willamette River Transit BridgeBicycle – Pedestrian Path Width

Willamette River Transit BridgeBicycle – Pedestrian Path WidthC t D iCurrent Design

Dedicated Facilities• Bicycle lane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0’• Pedestrian through zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0’• Potential opportunities for sharing

Willamette River Transit BridgeBicycle – Pedestrian Path WidthD d A l iDemand Analysis

Hawthorne BridgeHawthorne Bridge currently at 8,000 daily

Willamette River Transit BridgeBicycle – Pedestrian Path WidthD d A l i Fi diDemand Analysis - Findings

• Uphill traffic with varying climbing speeds create conflict events

• Opportunities to provide passing needed

Willamette River Transit BridgeBicycle – Pedestrian Path WidthP th WidthPath Width• How wide can width be pushed without changing structure type

• Path width can be increased to 14’• Path width can be increased to 14

• 14’ path width within acceptable range from city

• Provides for riding side by side or passing• Provides for riding side-by-side or passing

Estimate

$3.255 M

Questions?

Estimate

$3.255 M

Bridge Type - Cost

Vertical Clearance

Willamette River Transit BridgeNext Steps

• June 22, 2009: Steering Committee Meeting

• Fall 2009: WRBAC meetingFall 2009: WRBAC meeting

• December 2009: 25% Design Submittal

• Early Spring 2010: WRBAC meeting

• March 2010: 30% Design Submittalg

Thank you

For more information, visit: trimet.org/pmg p

Portland - Milwaukie Light Rail Willamette River Bridge ...WRBAC’s Direction to Design Team...

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