Willamette River Transit BridgePortland - Milwaukie Light Rail Willamette River Bridge

Willamette River Bridge Advisory Committee 02.05.09

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

• Context

• Scale

• Pedestrian Experience

Shima-Maruyama Bridge

Tokyo, Japan

Concerns we heard:

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Design Principles - Commitments

• To enliven the pedestrian experience

Pont de Bourgogne Chalon, France

Customization• As a response to contexts

Detail - Integrated Design• To address all scales

Transparency and Intimacy

Willamette River Transit Bridge

Possible Response

Cable-Stayed BridgesArt of the Possible

Customization

Willamette River Transit Bridge

Possible Response

Cable-Stayed BridgesArt of the Possible

Customization

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Possible ResponsesDetail/Total Design

Willamette River Transit Bridge

Pedestrian ExperienceRange of Responses

Cable-Stayed BridgesArt of the Possible

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Next Steps – Preliminary Engineering

Pier/Span Arrangement Final• Affect on height

• Affect on pier shallow water footprint

Section Final• Path width and configuration

• Overlooks

Willamette River Transit Bridge

Tower Configuration Final• Refine concepts

• Generate other concepts

Connection Detailing

Furnishings and Finishes

Cable-Stayed BridgesArt of the Possible

Next Steps – Preliminary Engineering

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Next Steps – Preliminary Engineering

Implement Design Guidelines• Customization

• Detail – Integrated Design

• Transparency and Intimacy

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Design Principles - Commitments

• To enliven the pedestrian experience

Pont de Bourgogne Chalon, France

Customization• As a response to contexts

Detail - Integrated Design• To address all scales

Transparency and Intimacy

Willamette River Transit Bridge

Questions to Answer:

Cable-Stayed BridgesArt of the Possible

What contexts, beyond bridges, can inform the design?

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

How are large elements integrated into a city without overpowering?Questions to Answer:

Willamette River Transit Bridge

0’

50’

100’

150’

200’

250’

300’

125’

CS

4 –

254’

CS

2 –

277’

Height Comparison

350’32

5’

250’

South Waterfront Wav

e –

120’

Tram 195’

Willamette River Transit BridgeHeight ComparisonSouth Waterfront Development

Willamette River Transit BridgeComparison

270’ 254’ 277’

Steel Bridge Cable Stayed - 4 Cable Stayed - 2

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

What is the maximum transparency (spans) and intimacy (towers) that can be provided ?

Questions to Answer:

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

How will these concepts inform an integrated design?Questions to Answer:

Willamette River Transit BridgeCable-Stayed BridgesArt of the Possible

Willamette River Transit Bridge

Willamette River Transit Bridge

• Met with Oregon Iron Works (OIW)

Cost Analysis

• Met with Hepp Steel Resources

• Met with Oregon Steel Mills (now Evraz)

Recent Activities

• Reviewed costs with other outside resources

• About 60% of the cost of wave related to steel

• About 25% of the cost of cable stayed related to steel

Willamette River Transit BridgeCost Analysis

• Team worked to verify estimates

Recent Activities

• Team worked to verify material availability

• Reviewed historical steel price trends

• Reviewed schedule implications of steel fabrication

Willamette River Transit Bridge

• Reconciled quantities and unit prices

Cost Analysis

Verified Estimates

• Steel prices used reflect current market cost

Willamette River Transit Bridge

• Reconciled quantities and unit prices

Cost Analysis

• Steel installed prices include:

– Price from mill

Verified Estimates

– Freight cost from mill to fabrication shop

– Fabrication cost and margin

– Freight costs from fabrication shop to job site

– Contractor installation costs and margin

Willamette River Transit Bridge

• 4” HPS available from only one source – Mittal Steel

Cost Analysis

• Thinner HPS available from SSAB Products

– SSAB focuses on production of standard products

Verified Material Availability

– Low probability of bidding work

– Thinner material requires more labor to laminate

– Laminating material not economically viable

– This would be a special run

Willamette River Transit Bridge

• 4” HPS available from only one source – Mittal Steel

Cost Analysis

• Oregon Steel Mills (now Evraz)

– Currently can not supply “Buy America” steel

Verified Material Availability

– Have never produced 4” HPS

Willamette River Transit Bridge

• 100% Design Shop Drawings Material Procurement

Cost Analysis

• Then Fabrication and Installation

• Construction duration analysis conclusions:

Analyzed Schedule Implication of Steel Fabrication

– 6 month increase high level of certainty

– 6 additional months for a total of 12 possible

– Acceleration of fabrication not viable per OIW

Willamette River Transit Bridge

• Quantity based estimate

Cost Analysis

• Contractor engineering

Cost Estimate Include

• Contingencies

• Differential items

– Requirements Risk

– Bid and Market Risk

– Design Development Risks

Willamette River Transit BridgeCost Estimate

TriMet’s Estimates

Reviewed National Constructors Groups’ Backup

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

margin as needed per recent findings

Willamette River Transit BridgeCost Estimate

Design Build Contractor Engineering

Cost to advance design from

Preliminary Engineering to Final Design

Plus

Cost for Contractor Construction Engineering

Willamette River Transit BridgeCost Estimate

Design Build Contractor Engineering

Same percentage used for all types

Willamette River Transit BridgeCost Estimate

Contingencies composed of three main items

Requirements Risk

Bid – Market Risk

Design Development Risk

Willamette River Transit BridgeCost Estimate

Requirements Risk

Items know but not included in construction cost line

Examples

Address water line – Supplemental greenway work

Willamette River Transit BridgeCost Estimate

Bid – Market Risk

Factors affecting bid climate

Examples

Bridge complexity – Bidder experience

Number of bidders

Willamette River Transit BridgeCost Estimate

Design Development Risk

Difference between estimating what is shown today

versus

Contractor bid prior to contract award

Willamette River Transit BridgeCost Estimate

Costs that are different between alternatives

Extended overhead for 6 months

$4.5M

Supplemental Owner Engineering

$1.4M

Willamette River Transit BridgeCost Estimate

Totals in January 2009 values

Willamette River Transit BridgeCost Estimate

Totals do not include

Construction financing costs

Steel escalation cost if bid during peak market

Willamette River Transit BridgeCost Estimate

Funding calculated with mid-point of construction values

Year of Expenditure (YOE)

August 2013

Willamette River Transit BridgeCost Estimate

January 2009 cost escalated to YOE values

Willamette River Transit BridgeCost Estimate Discussion – Questions?

Wave$176 M

CS 4 Pier$102 M

CS 2 Pier$113 M

Willamette River Transit Bridge

Thank you