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Tropical Storm IreneThe Impact on Ulster County and the Phoenicia BridgeUlster County –New York
Presented by Scott Davis, P.E.
August 28, 2011
NYS Region 8‐ Ulster County
Ulster County 8‐12 inches of Rain
Burnham Hollow Bridge
Burnham Hollow Bridge Replaced
Dry Brook Bridge
Dry Brook Bridge Replaced
Maben Hollow Bridge
Maben Hollow Road Replaced
Steve Fischer Road Culvert
Steve Fischer Bridge Replacement
Bridge replaces Culvert
The Phoenicia Bridge
Original Truss Bridge
1976 Truss Bridge Removed
1976‐ Replacement Structure
Existing StructureBuilt in 1976Total Length 255 feet ‐ 3 spansRolled 36 inch deep GirdersReinforced Concrete deck with SIP’s 7 ½” thick34 feet in width with two travel lanesStub abutments on H‐Pile FoundationsPiers are H‐piles with diagonal bracing encased in concretePile foundations are embedded 65 feetSpan 1 replaced in 1995 after flood
As the flood waters recede
The Damage
The Evaluation Begins
Access was an issue
Anchor Bolts Shear off
OPTIONS
Replace bridge with new structure
Remove bridge and do not replace
Repair existing bridge
FINDINGS• Undersized anchor bolts at span 1 sheared
• Span 1 shifted 18 inches off bearings
• Increased cracking at pier 2 under girder 4
• Guide rail and deck completely removed
• Reinforcement exposed in deck slab
• Bridge joint completely failed
• Diaphragm bolts sheared
• Debris lodged in steel superstructure
• Steel girders out of plane vertical and horizontal from shifting of pedestals
• Bridge does not have adequate hydraulic opening
ENTER
• Ulster County DPW
• NYCDEP‐ NYC watershed
• NYSDOT
• NYSDEC
• SOB (Save Our Bridge People)
Replacement Option
Crossroads and Rail
Removal of the Existing Bridgewithout Replacement
• Structure has been in service since 1976
• Removal could cost more than repairs
• Businesses suffering
• Permanent detour around Main Street
• Hydraulic Opening not an issue
Repair of the Existing Bridge
• Overall Repairs to Bridge where feasible
• Cost of repairs
• Repairs could be made by County
• Hydraulic opening could be increased by dredging stream bed to original elevation
• Important Link to the Hamlet would be re‐established for businesses
It’s official – Bridge to be RepairedPhoenicia's Bridge Street Bridge over the Esopus Creek, knocked out of commission by the Irene floods last summer and thought to be un‐fixable, will be put back in service after all, Ulster County officials say.
A press release issued today by the office of Mike Hein, Ulster County executive:
Phoenicia, NY – County Executive Mike Hein is extremely pleased to announce that a preliminary assessment by the independent engineering firm Peak Engineering indicates that the damage caused to the Bridge Street Bridge in Phoenicia by Hurricane Irene and Tropical Storm Lee is not irreparable as originally thought. As such, the Ulster County Bridge Crew is expected to be able to provide the necessary repairs in order to reopen this vital link to the Hamlet of Phoenicia.
According to County Executive Hein, “Hurricane Irene was the worst natural disaster in our County’s history, causing over $15 million in damages to County infrastructure, “I fully recognize the importance of this bridge to the business district and the citizens of Phoenicia. . Though there is an extensive amount of work to be done on the Bridge Street Bridge, we look forward to celebrating its reopening by July 4th weekend.”
County Begins work • Bridge to be jacked and slid back into place
• Diaphragms repaired
• Capbeam cracking repaired
• New bearings and anchor bolts to be installed
• New joint system to be installed
• Steel beams to be straightened at connection plates
• New wearing surface over repaired deck
• New guiderail
Jacking operations
Bearings Reset & Joint Replaced
• Insert bearing and Joint details
The Repairs
DPW completes work ahead of schedule
DPW completes work ahead of schedule
Ribbon Cutting
Bridge is OPEN!
QUESTION
• Why was this bridge important to the Town of Phoenicia when there was another route into town with less than a mile detour?
• ANSWER: Local businesses in downtown benefitted greatly from the traffic that was generated by the Bridge Street route.
QUESTION
• What is the minimum diameter anchor bolt NYS requires.
• ANSWER: 1”
QUESTION
• How did the concrete deck help to prevent complete collapse?
• ANSWER: The deck wedged itself against the backwall.
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