governor mario m. cuomo bridge · governor mario m. cuomo bridge international bridge, tunnel and...
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GOVERNOR MARIO M. CUOMO BRIDGEInternational Bridge, Tunnel and Turnpike Association– June 25, 2018Jamey Barbas, PE – Project Director
PROJECT LOCATION
NATIONAL & REGIONAL SIGNIFICANCE
Critical commerce corridor in NY-NJ-PA Metropolitan Statistical Area, which generates nearly 10% of US GDP
935 km Thruway system connects 80% of State’s population of 19.5 million
Primary truck gateway for Port of NY & NJ; key bypass route around NYC connecting New England to points south & west
4
Gove
BRIDGE LOCATION: NEW YORK, US
ORIGINAL TZB CONSTRUCTION
Original construction costs totaled $80.8 million
BUOYANT CAISSONS
8 Piers Supported by Caissons
Buoyancy Supports 70% of Dead Load
Dewatering Pump Systems
WHY DO WE NEED A NEW NY BRIDGE?
Opened in 1955 with design capacity of 100,000 vehicles daily
Currently carries more than 140,000 vehicles daily
Accident rate is twice the average rate on Thruway system
NO emergency lanes or shoulders
NO mass transit, pedestrian or bicycle capability
Significant cost to structurally rehab current span over next 20 years
NEW BRIDGE BENEFITS
No major structural repairs for 100 years
Reduces congestion with 8 wider traffic lanes,
emergency lanes, and cashless tolling
Integrated bike and pedestrian path
Built ready for future bus rapid transit
CHANGING LANESTAPPAN ZEE BRIDGE
Moveable traffic barrier
Tappan Zee Bridge1 span, 7 lanes
11’ lanes with movable traffic barrier
87’
CHANGING LANESTHE TWIN-SPAN BRIDGE
2 spans, 8 general traffic lanes,4 shoulders, 2 bus lanes, shared-use path
Westbound Span96’
Westchester to Rockland
Eastbound Span87’
Rockland to Westchester
Bus Lane
Shou
lder
Shou
lder
Shared-UsePath
Shou
lder
Shou
lder
Bus Lane
THE NEW NY BRIDGE PROJECTDYNAMIC LIGHTING | ENERGY EFFICIENT LEDS
EXTREME EVENT DESIGN
EARTHQUAKE
2,500-YR EVENT WITH REPAIRABLE DAMAGE
1,000-YR EVENT WITH MINIMAL DAMAGE SCOUR AND FLOODING SHIP IMPACT WIND EVENTS
20-YR EVENT FOR TEMP CONSTRUCTION CONDITION
100-YR EVENT SERVICE CONDITION
10,000-YR EVENT STABILITY
POTENTIAL FUTURE LOADING
SERVICE LIFE DESIGN
Contract Performance Requirements 100-year min. service life for “non-replaceable
components” such as towers, piles, pile caps, piers, pier caps, deck and superstructure (60-year min. for barriers) Corrosion Protection Plan (CPP) to identify exposure,
degradation mechanism, design and constructions strategies, and life-cycle costs for replaceable components Probabilistic approach to modeling
SERVICE LIFE DESIGN
• Modeling• Detailing• Material
Specification• Trial Testing
Design
• Proven Methods• Quality Control• Quality Assurance
Construction • Monitor• Inspect• Maintain• Update
Service Life
Operations
SERVICE LIFE DESIGN
Classification of component into exposure zone
Design strategies for concrete durability: Strategy A : Avoidance of deterioration
approach by use of non-reactive or inert materials Strategy B : Full probabilistic approach
using performance based durability modeling Based on limit state design theory Chloride-induced reinforcement
corrosion
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP - Concrete
Uses fib (International Federation for Structural Concrete) Bulletin 34 –Model Code for Service Life Design Commonly used European standard Task Group formed in 2002 Bulletin 34 published in 2006 Research on-going
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP - Concrete
fib Bulletin 34 – cont’d1. Quantify degradation mechanisms2. Define limit states3. Define probability/reliability, β4. Determine service or ultimate limit
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP - Concrete
fib Bulletin 34 – cont’d Level 1: full probabilistic approach for “exceptional structures” Level 2: deterministic approach using safety factors Level 3: deemed to satisfy approach
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP - Concrete
Chloride-induced corrosion identified as the primary degradation mechanism Level 1 (probabilistic) approach Depassivation of reinforcement taken as the design limit state β = 1.30 or 10% probability of corrosion initiation Service limit state
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP - Concrete
Other degradation mechanisms use Level 3 approach Freeze-thaw (ASTM C666): min. 90% durability @ 300 cycles Scaling resistance (ASTM C672): y <= 3 @ 50 cycles Air Content (ASTM C457): spacing factor <= 0.008” W/C < 0.40 DEF: mass concrete thermal control w/ FA and GGBS AAR: selection of non-reactive aggregates Sulfate Attack: C3A <= 8%
CONCRETE SERVICE LIFE DESIGN
Design-Builder’s CPP
Primary Model Inputs Reliability, β Chloride threshold Concrete cover Chloride migration coefficient Aging factor specific to
cementitious content Chloride loading, expressed as % of
w/c
CONCRETE SERVICE LIFE DESIGN
Oversight Verification
Design Cores taken from existing bridge Deterministic STADIUM modeling STADIUM results converted into quasi-probabilistic analysis
CONCRETE SERVICE LIFE DESIGN
Oversight Verification
Construction Mix prequalification testing Independent NT Build 492 testing Concrete cover verification
SERVICE LIFE DESIGN
Design-Builder’s CPP - Steel
Weathering steel girders (specified in the contract)
NEPCOAT List B paint system
Piles with sacrificial wall thicknesses
Stay Cable Protection Corrosion inhibiting compound HDPE sheathing around each strand HDPE ducting around each cable
SERVICE LIFE DESIGN
Design-Builder’s CPP - Steel
• Provides a baseline response of the structure
• Specific structural element performance– Bearings– Joints– Cables
• Asset Management– Monitor long-term performance– Optimize inspection program– Assist Operation and Maintenance Decisions
ITS at Operation Center
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STRUCTURAL HEALTH MONITORING SYSTEM
STRUCTURAL HEALTH MONITORING SYSTEM
STRUCTURAL HEALTH MONITORING SYSTEM
STRUCTURAL HEALTH MONITORING SYSTEM
Measure wind speed and movement
Collect load demands to gauge strains on critical elements of the bridge
Capture the behavior of the bridge due to daily or seasonal temperature changes
Trigger maintenance alters to inspect particular components
Inform our command center for efficient operations of traffic
STRUCTURAL HEALTH MONITORING SYSTEM
3 D BRIDGE MODELING, BIM, SHMS & ASSET MANAGEMENT
BIM and ASSET MANAGEMENT SYSTEMS
Learn MoreFollow us @NewNYBridge
Visit us at NewNYBridge.com
Call the Project Hotline 1-855-TZBRIDGE (892-7434)
Email [email protected]