AC bridges ( Weins bridge, Desauty bridge, Maxwell's inductance bridge)
M-25 over Harbor Beach Creek. Bridge to Culvert Replacement $1.27M Programmed Cost –$270,000...
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Transcript of M-25 over Harbor Beach Creek. Bridge to Culvert Replacement $1.27M Programmed Cost –$270,000...
M-25 over Harbor Beach Creek
M-25 over Harbor Beach Creek
• Bridge to Culvert Replacement• $1.27M Programmed Cost
– $270,000 Innovative Bridge Research and Deployment Program Federal Grant
Existing Harbor Beach Creek Bridge
M-25 over Harbor Beach Creek
• Composite Arch Culvert System
• aka “Bridge in a Backpack”
“Bridge in a Backpack”
Installing arches
Composite decking
Arches inflatedand formed
“Bridge in a Backpack”Filling arches with concrete
FasciaBackfill to road
M-25 over Harbor Beach Creek
• Traffic currently detoured
• Fix Life of >75 years
• Every Day Counts
• Faster + Cheaper + Safer + Smarter = Better
Existing Harbor Beach Creek Bridge
M-25 over Harbor Beach Creek
• Started in Spring 2012
• Original completion date August 25
Sixteen 12” diameter arch tubes arriving at project site
M-25 over Harbor Beach Creek
Arch end section
Inlet holes for concrete
M-25 over Harbor Beach Creek
Large lateral forces from arches required battered piles
First arch rib install
M-25 over Harbor Beach Creek
Reinforcement for arch end anchoring into abutment
Multiple arch tubes installed
M-25 over Harbor Beach Creek
Arch tube installation complete
Finishing concrete around arch tube endings
M-25 over Harbor Beach Creek
Composite decking installation
M-25 over Harbor Beach Creek
Expansive Self Consolidating Concrete (SCC) slump flow test
Measuring slump flow
M-25 over Harbor Beach Creek
Filling arches from top with SCC
Sounding for voids – 8/9
M-25 over Harbor Beach Creek
• Challenges:• Still need a conventional deep foundation• Remote project location, readi-mix supplier 1 hour away• Issues with SCC remaining fluid and workable long enough• Concrete setting too fast in arch ribs causing voids
• Working with AIT to resolve issues:• Revising SCC mix with additional admixtures• Drilling additional holes in arch ribs to fill voids with grout• Identify high stress areas via finite model to avoid drilling in those
locations
M-25 over Harbor Beach Creek
• When arches complete and composite with concrete, a 7” concrete overlay will be cast over the composite decking for lateral stability
• Decorative composite finish will be placed on headwalls and wingwalls
• Placement of roadway fill and pavement section
M-25 over Harbor Beach Creek
• Design specifications recently voted on and approved by AASHTO Subcommittee on Bridges and Structures
MDOT CFRP Implementation: Building bridges for the 21st century
AASHTO Subcommittee on Bridges & Structures
Technical Committee T-6 Austin, TX, July 9, 2012
Matt Chynoweth, Engineer of Bridge Field Services
Existing Structure
Two span simply supported prestressed I-beam structure in poor condition (based on NBIS ratings)
MDOT CFRP Deployment• Pembroke over M-39 Bridge Replacement
Materials stored at Detroit Maintenance Garage through winter and spring of 2011
MDOT CFRP Deployment• Pembroke Bridge CFCC cables
Special provisions for handling instructions were written for installation
MDOT CFRP Deployment• NEFMAC Grid installation
Finished installation
MDOT CFRP Deployment• NEFMAC Grid installation
Measuring deck deflections, deck strains and PT tendon loads
MDOT CFRP Deployment• Monitoring and Data Collection
MDOT CFRP Deployment• Complete Pembroke Structure
Photos taken October 2011
Existing structure
Project let January 2012
MDOT CFRP Deployment• M-50/US-127 BR over NS RR
Cables were double sheathed and fed into 5” conduits
MDOT CFRP Deployment• M-50 Bridge CFCC cables
Cables were double sheathed and fed into 5” conduits
MDOT CFRP Deployment• M-50 Bridge CFCC cables
Fabricator’s stressing chair: cables stressed to 75 kips, then 150 kips once deck is placed & cured
MDOT CFRP Deployment• M-50 Bridge CFCC cables
Load cells placed on dead end measure micro-strain, which is converted to force
MDOT CFRP Deployment• M-50 Bridge CFCC cables
Steel/CFRP stirrups along the span
Steel/CFRP stirrups at diaphragms
Transverse ducts for TPT
Steel/CFRP prestressing strands
Next Steps
Other research:
• MDOT project OR14-24: Evaluating Long Term Capacity and Ductility of Carbon Fiber Reinforced Polymer prestressing and post tensioning strands subject to long term losses, creep, and environmental factors
• To begin in FY 2013
• NCHRP 12-97: Design Guidelines for Field Deployment CFRP prestressed beams in Bridge Construction
• MDOT submitted research idea
Thank you
Questions?