san francisco-oakland bay bridge seismic safety...
TRANSCRIPT
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San Francisco-Oakland Bay BridgeSeismic Safety Projects
Program Overview
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Bay Area Bridges
Bay Bridge Overview
San Francisco-OaklandBay Bridge
Richmond-San Rafael Bridge
San Mateo Bridge
Dumbarton Bridge
Carquinez BridgeBenicia-Martinez Bridge
Golden Gate Bridge
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Bay Bridge Overview
San Francisco
Oakland
Yerba BuenaIsland
TreasureIsland
San Francisco-Oakland Bay Bridge
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Bay Bridge Overview
Seismic Safety Projects
West Approach
West Span
Yerba Buena Island (YBI)Transition Structure
Self-AnchoredSuspension (SAS) Span
Skyway
OaklandTouchdown
Existing East Span(to be demolished)
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Bay Bridge Overview
• Largest public works effort in state history
• Bridge damaged in Loma Prieta earthquake
• Entire bridge being retrofitted or replaced
• Opens to westbound traffic in 2012, eastbound traffic in 2013
Project Overview
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Bay Bridge Overview
West Span
• Retrofit began in 1999; finished in 2004
• 8,500 tons of structural steel added
• Seismic devices including “shock absorbers” installed
• Entire 3 million-ton span was lifted to install seismic bearings
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Bay Bridge Overview
West Span
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Bay Bridge Overview
West Span
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Bay Bridge Overview
West Span
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Bay Bridge Overview
West Span
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Bay Bridge Overview
West Span
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Bay Bridge Overview
West Approach
• 1-mile stretch of Interstate 80 with 6 on- and off-ramps
• Inches from homes/businesses
• Extremely complex construction project
• Lower deck closed Labor Day weekend 2006
• Completed in early 2009
• Western half of bridge is now seismically safe
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Bay Bridge Overview
West Approach
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Bay Bridge Overview
West Approach
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Bay Bridge Overview
West Approach
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Bay Bridge Overview
West Approach
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Bay Bridge Overview
West Approach
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Bay Bridge Overview
Oakland Touchdown
• Connects Interstate 80 to East Span
• Constructed in two phases
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Bay Bridge Overview
Oakland Touchdown
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Bay Bridge Overview
Oakland Touchdown
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Bay Bridge Overview
Oakland Touchdown
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Bay Bridge Overview
Oakland Touchdown
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Bay Bridge Overview
Skyway
• Parallel roadways replace existing double-deck
• 1.2 miles long
• Completed in early 2008
• 452 pre-cast concrete segments
• Seismic innovations in design
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Skyway
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Bay Bridge Overview
Self-Anchored Suspension Span• Iconic
• Longest self-anchored suspension bridge in the world (2,047 feet)
• Single 525-foot-tall tower
• Unique design
• Deck sections arrive this summer
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Bay Bridge Overview
Self-Anchored Suspension Span
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Bay Bridge Overview
Self-Anchored Suspension Span
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Bay Bridge Overview
Self-Anchored Suspension Span
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Bay Bridge Overview
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Bay Bridge Overview
Yerba Buena Island Transition Structure• Transitions parallel decks to double decks
• Foundations completed in earlier contract
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Bay Bridge Overview
Yerba Buena Island Transition Structure
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Bay Bridge Overview
Yerba Buena Island Transition Structure
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Bay Bridge Overview
Yerba Buena Island Transition Structure
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Bay Bridge Overview
Labor Day Weekend 2007• Closed entire bridge
• Removed and replaced 350 foot, 6,500 ton section of roadway
• Bridge reopened 11 hours ahead of schedule
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Bay Bridge Overview
Labor Day Weekend 2007
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Bay Bridge Overview
Labor Day Weekend 2007
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Bay Bridge Overview
Labor Day Weekend 2007 Timelapse
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Bay Bridge Overview
Labor Day Weekend 2009• Closing entire bridge
• Cutting out 350-foot long, 3,300 ton section of bridge
• Sliding in 3,600 ton segment to connect East Span to bypass
• Work will occur 150 feet in the air
• Traffic will use bypass until new East Span opens
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Bay Bridge Overview
Labor Day Weekend 2009
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Bay Bridge Overview
Labor Day Weekend 2009 Simulation
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Bay Bridge Overview
Risk Management
• On-time, on-budget
• Hailed as national example
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Bay Bridge Overview
Financials• Retrofit is many mega-projects
• Total project cost: $6.5 billion
Self-AnchoredSuspension Bridge
Skyway
Yerba Buena IslandDetour
Yerba Buena Island Transition Structure
OaklandTouchdown
WestApproach
West Span
Original East SpanDemolition
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Bay Bridge Overview
Environment
• Team of dedicated environmental professionals
• “Bubble curtain” used to minimize impact on marine life during Construction
• Created new bird nesting habitat under Skyway
• Monitoring and protecting water quality
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Bay Bridge Overview
Environment
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Bay Bridge Overview
Environment
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Bay Bridge Overview
East Span Flythrough
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Bay Bridge Overview
We’re making history.