FHWA and AASHTO TIG ABC……..

15 Pages·2013·2.83 MB·English

Purpose of this presentation
Accelerated Bridge • Present current “state of practice” in
Construction in the
ABC in the Northeast
Northeast
• Different ABC Methods in use
Michael P. Culmo, P.E.
CME Associates, Inc., East Hartford, CT • What is being used in the Northeast
• Focus on Massachusetts
•National Leader in ABC
• What may be coming down the road
•Recently completed research and testing
Basis of this session What is ABC?
• FHWA ABC Manuals
• CME experience with ABC uses innovative planning, design, and
different DOTs construction methods, in a safe and cost-
effective manner, to reduce project delivery time
and onsite construction time
FHWA and AASHTO TIG ABC……..
• Reduces onsite construction time
“We need to change the way we build • Prefabrication off site
highways. We need to build them faster, • Reduces Mobility Impacts
• Reduces Environmental impact time
have them last longer, have them be safer
• Reduces user costs
and at a lesser cost."
• Improves Safety
• Construction crews
• Travelers
Get In, Get Out, and Stay Out”
• Improves Quality
• Plant produced products
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Public Perception of ABC Public Perception of ABC
2009 Utah DOT Survey
2011 Utah DOT Survey
Public Perception of ABC Technologies in use in the Northeast
• Prefabricated Elements
–All portions of the bridge
• Structural Placement Methods
–SPMT’s & Lateral Sliding
2011 Utah DOT Survey
Complete Bridge Element Prefabrication Complete Bridge Element Prefabrication
• New Hampshire Project • Massachusetts Project
– How fast can we build a bridge? – Test bed for recent PCI
– Experimental project Northeast Details
– All components prefabricated – All components prefabricated
– 115 foot span – Three span bridge over a
railroad
– Precast cantilever abutments
– Precast integral abutments
– Clock started after old bridge was
removed – Precast Piers
– How long did it take? – Precast Deck and approach
slabs
• 8 Days
– Two stages of construction
• Used in part as the basis of the
• 120 days per stage
PCINE Details
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Integral Abutments CMP Voids
• Corrugated Void Pockets –Integral abutments • Corrugated Void Pockets
– Developed in Iowa
– Tested for seismic connection
– Very good shear capacity
• Footings
• Integral abutments
• Pier caps
– Easy to form
– Reduces shipping weight
CMP Voids CMP Voids
• Pile Tolerances • Design
–Need to specify smaller than – Research shows that the cap can be designed as
CIP
normal tolerances
– Punching shear resistance of concrete “plug”
–Typically 2” to 3” • Based on AASHTO 5.13.2.5.4
Nominal Punching Shear Resistance
Vn= 0.125(f’c)1/2Acv
CMP ID Pipe size:
D = Dpile+ 2*(Tpile) + Dclear Where
Acv = surface area of concrete plug
= circumference of pipe * H
H = Height of plug above pile
For a 24” dia. Pipe and f’c= 4ksi
Resistance = 226 kips per linear foot of plug
Integral Abutment Project Integral Abutment Example
• Charlemont, MA
Charlemont
Construction
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Integral Abutment Example Cantilever Walls
• CMP Voids Used to:
– Reduce weight
– Connect cap to wall stems
– Connect Stub Abutments to
Footings
• Design using emulation
– Grouted Splice Couplers
Available Technologies Grouted Reinforcing Splice Couplers
• Grouted Couplers
– Emulates a reinforcing steel lap splice
– No special design required
– Multiple companies
–non-proprietary
– Used in
• parking garages
• Stadiums
• Bridges
– Favored by NE States
– Seismic
• Used in buildings (ACI)
Installation Video on YoutubeTM
• Previously tested in Japan Search “Georgia Pier Construction”
• New testing completed at Univ. of Nevada
Testing data Testing data
Grouted Splice coupler @ end of column
Control Column w/o Grouted Splice Coupler
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Testing data CMP Voids in Cantilever Walls
• Used to:
– Reduce weight
– Connect cap to wall stems
• Low moment demand
connection
– Connect Stub Abutment
Stems to footings
• Low moment demand
connection
Both Plots
CMP Voids in Cantilever Walls Example Project
• Worthington, MA
Worthington
Construction
Precast Piers Precast Piers
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Holyoke Project Grouted PT Ducts
• Good for seismic connections
• Based on Research in Texas,
California and Washington
• NCHRP 12-74 (seismic)
• Similar to grouted couplers
• Good for development into mass
concrete
• Lap splices?
• Check conflicts with transverse
bars
CMP Voids Corrugated Column End
• NCHRP 12-74 (seismic) • Based on FHWA Highways for LIFE Research in
• Requires supplemental Washington
reinforcing • No reinforcing passing from column into footing
• Requires temporary support • Good for pile supported foundations
Pile Supported Footings Pile Supported Footings
•Option 1: •Option 2:
–Use corrugated pipe voids –CIP Footing with Precast Column
–Not good for closely spaced piles
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Precast Decks on PS Beams
Precast Full Depth Deck Panels
• Resources:
–State-of-the-Art Report on Full-Depth Precast
Concrete Bridge Deck Panels
–Sponsored by:
–PCI
–FHWA
–AASHTO LRFD
–PCI Design Handbook
Precast Decks on Steel Framing PC Deck Connection Details
Precast Decks
Holyoke Project
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Issues with Steel Bridges
Holyoke Project
• Shear stud spacing can get very tight Large Pockets
• Small pockets may not work Shear Stud Installation
• Option: Use large pockets Note:
• Enlarged pocket for close stud
–Reinforcing passing through
spacing
• Adopted by PCINE • Speed of Installation
• Space needed to install the
studs
Handling Calculations Typical Panel Lift
• Lifting inserts and handling calculations 8 Point Pick with spreader beam
are typically done by the contractor
– Means and methods
– Allows for different lifting hardware and
slings
• PCI Design Handbook has guidance on
handling calculations
– Specifications should reference this
document along with allowable handling
stresses
PCI Criteria Long Term Performance Information
• I-84/Route 8 Interchange –Waterbury, CT
• Keep concrete stresses within acceptable
limits to minimize or prevent cracking
–Apply a factor of safety on the modulus of
rupture
•No discernable cracking stress = (7.5 * √ f’c)/1.5
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Project Information After 23 years of service
• Curved structure (straight beams) • Excellent condition
• 6 Span bridge with continuous spans
• Used membrane waterproofing and Asphalt Wearing
• Single lane surface
• Prestressed transversely and post tensioned
• No leakage through joints
longitudinally
• Details similar to UDOT
• 42 Day construction
• No construction problems
• Built in 1990
After 23 years of service Another long term example project
Route 8 Viaduct, Seymour, CT
• 2 Curved structures
• Over 50 spans (all simple spans)
• Prestressed and post tensioned
• Weekend closures only
• Old deck removed on Friday night
• New deck erected on Saturday
morning
• Post tensioned on Saturday night
• Grouting on Sunday morning
• Open to traffic Sunday night
• Asphalt wearing surface with
waterproofing membrane
• In service for 19 years
• Excellent condition
Modular Superstructures Modular Deck Beams
•2 Beams with Precast
Deck
•Inverset
•Non-Inverset
•Also called PBUs
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NEXT Beam Deck Bulb Tees
• Precast Double Tee for Bridges •Bulb Tee Beam with thicker
• Developed by the PCI NE Bridge Tech top flange
Committee •Butted system
Modular Deck Beam Structures
Why Consider Deck Beams?
 Theyprovideaninstantsafeworkplatform 93 Fast 14
 Theyreducetheneedfortemporarysafetyrailingsand
fallprotectiononallbeams(fasciabeamsonly).
 They reduce or eliminate the need for on-site deck
formingandthesubsequentformstripping.
 They reduce the impacts to the traveling public by
reducingconstructiontime.
Concrete Closure Pours Design of Closure Pour
Options
• Speed of Construction
–Narrow Closure pour with straight bars -UHPC
• UHPC: 3 days + to reach final strength
–Medium width closure pour with hooked bars
• Grout: 12 to 48 hours
–Wider pour with lapped bars and High Early Strength
• Concrete: 7 days
Concrete
• High early strength concrete: 6 to18 hours
• Depending on the mix design
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