PRESENTATION OF TECHNICAL...
Transcript of PRESENTATION OF TECHNICAL...
February 28, 2017
Bahia Honda Bridge Reconstruction Project
PRESENTATION
OF TECHNICAL QUALIFICATIONS
Henry M. Flagler
• Born in Hopewell, NY (01-02-1830)
• Standard Oil
– Co-founder with John Rockefeller
and Samuel Adams
– Obtained near complete control
of oil industry in United States
– Violated Sherman Anti-Trust Act
and was dissolved into 34
separate companies
Henry Flagler
• Moved to Florida in 1880s
• Responsible for much of the development of Florida’s East Coast
– Started the Florida East Coast Railway
– Built hotels in Jacksonville, St. Augustine, Ormond Beach, Palm Beach, and Miami
– Considered the father of Palm Beach and Miami
“Flagler’s Folly”
• Extend the FEC Railway to Key West
• 128 mile extension from end of peninsula
• To provide access to proposed Panama Canal and Latin America
• Considered impossible to build
• Self-funded by Flagler
– Between $20 and $50 million
– $482 million to $1.2 billing in 2017 dollars
Overseas Railway
• William J. Krome, Chief Construction Engineer
• 17 miles of bridges
• 20 miles of fill embankment
• 2 mile crossing from Long Key to Conch Key
• 7 mile crossing from Knight’s Key to Little Duck Key
• 24 foot deep, mile-wide crossing at Bahia Honda
Bahia Honda Bridge
• 5,050 ft long
• 247 ft Parker truss span
• 26 Pratt truss spans
– (13) 186 ft spans
– (13) 128 ft spans
• (9) 80 ft plate girder spans
Eighth Wonder of the World
• Three hurricanes slowed and threatened to
halt construction
• 4,000 simultaneous construction workers
• Construction completed in 1912
Labor Day Hurricane of 1935
• Extensive damage to miles of railway
• Florida East Coast Railway bankrupt
• Remains sold to State of Florida for
construction of Overseas Highway
Overseas Highway
• Existing rail infrastructure re-purposed
• Bahia Honda Bridge
– Deck constructed above trusses
– Pile bent approaches constructed
• Opened for traffic on March 29, 1938
Overseas Highway Widening
• Widened to 4-lane divided in 1970s
• Bahia Honda Bridge added to National
Register of Historic Places in 1979
Pedestrian Overlook
• Two Pratt truss spans and the highway approach
• Part of the Bahia Honda State Park
• Closed to pedestrians in 2015 due to
deterioration and safety concerns
Bridge Restoration Team
Approach and Truss Span Inspection
• Performed by FIT Engineering in June 2016
• Sanya Johnson, PE
– Climbed the structure
– Hands-on inspection
– Report of findings and 1,152 photos!
FIT Inspection Findings
Approach Pile
Approach Stringers Bottom Chord
Top Chord
Pier and Abutment Inspection
• Performed by UESI in November 2016
• Team of divers inspected the piers and abutment
– Above and underwater
UESI Inspection Findings
• Pier and Abutment Concrete
– Cracking wide enough for chloride infiltration but no corrosion bleed-out
– Corrosion from protruding formwork support rods
– Isolated areas of poor consolidation
• Foundations
– Undermining due to scour
Preliminary Analysis and Alternatives
• Preliminary Structural Analysis
– Reviewed structure with reduced section properties
– Existing Structure unsafe for pedestrian loads
• Alternatives
– No build
– Field rehabilitation
– Disassembly and shop rehabilitation
– Replacement
Selected Alternative
• Replacement
– Re-use existing piers and abutment
– Replace existing truss and approach spans with replica structure
– Utilize modern sections to replace existing built-up sections