Presentation on theme: "Connection Details for Prefabricated Bridge Elements and Systems"— Presentation transcript:
1 Connection Details for Prefabricated Bridge Elements and Systems Michael P. Culmo, P.E.Vice President of Transportation and StructuresCME Associates, Inc., East Hartford, CT
2 “Connections Details for Prefabricated Bridge Elements and Systems” Project Goals: Gather details of Connections that have been used on accelerated bridge construction projectsInvestigate transfer of technology from other markets into the bridge marketParking GaragesStadiumsBuildingsThe details were gathered from transportation agencies and other industries, which turned out to be a key component of the work. Accelerated construction is also used in vertical construction. Many of the details used in this industry are transferable to bridge construction.
3 Available Technologies Corrugated Void PocketsDeveloped in IowaVery good punching shear capacityFootingsIntegral abutmentsPier capsEasy to formReduces shipping weightGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
4 Available Technologies Corrugated Void Pockets – Integral abutmentsGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
5 Available Technologies Corrugated Void Pockets – Integral abutmentsGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
6 Available Technologies Corrugated Void PocketsCantilever AbutmentsCantilever WallsGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
7 Available Connection Technologies Grouted CouplersEmulates a reinforcing steel lap spliceNo special design requiredMultiple companies – non-proprietaryUsed in vertical construction formany yearsparking garagesStadiumsBridgesFavored by Northeast StatesSeismicUsed in buildings (ACI)Previously tested in JapanNew testing underway at Univ. of NevadaGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
8 Grouted Reinforcing Splice Connectors The couplers can be used where ever a construction joint would normally be placed in a conventional bridge. This facilitates the design of the bridge because it can be designed as a cast-in-place structure. The couplers replace the normal lap splices. The only design change is the depth of the reinforcing cage in order to get proper cover over the couplers.Installation Video on YoutubeTMSearch “Georgia Pier Construction”
9 Grouted Splice coupler @ end of column Testing dataGrouted Splice end of column
11 Pile Supported Footings Use corrugated pipe formsUsed for integral abutment stems also
12 Pile Supported Footings Use precast stem with CIP FootingGood for footings with closely spaced piles
13 Available Technologies Grouted PT DuctsSimilar to grouted couplersGood for development into mass concreteLap splices?Check conflicts with transverse barsGrouted reinforcing splice couplers are an example of a connection that migrated from the vertical construction industry.
14 NCHRP Report 681 Detail Grouted PT Duct Similar to grouted sleeves Used in several statesTested for high seismic regionsSignificant adjustabilityDetails, specifications and design information availableThe NCHRP study was for high seismic regions, however the connections are good for all locations.
15 Other Sources for Details Utah DOT ABC Website(search ABC)Piers, abutments, walls, decksPCI Northeast(Bridge resources)MassDOTWorking on new ABC manualNCHRP Report 681Development of a Precast Bent Cap System for Seismic RegionsWeb search “NCHRP Report 681”There are other sources of details for ABC connections.
16 Manual Distribution Availability Published June 2009 Is available through FHWA Highways for LIFE websiteThe manual is complete and available for use. A web-site is under development that will include the details in the manual. Other details will be added to the website as they become available.
17 NEW FHWA ABC Manual Accelerated Bridge Construction Experience in Design, Fabrication and Erection of Prefabricated Bridge Elements and Systems
18 Previously Published FHWA Manuals 2006: Decision-Making Framework for Prefabricated Bridge Elements and Systems2007: Manual on the Use of Self-Propelled Modular Transporters to Remove and Replace Bridges2009: Connection Details for Prefabricated Bridge Elements and Systems
19 Goal of New Manual Overview of all aspects of ABC Fill in areas that are not covered in the other manualsDovetail with Every Day Counts InitiativeCompliment SHRP2 R04 Work“Innovative Bridge Designs for Rapid Renewal”
20 Manual Outline ABC Definitions Chapters Introduction: Why use ABC? Accelerated Bridge Construction TechniquesPlanning and Scoping Projects with ABC and PBESImplementing ABC in a Transportation AgencyPrefabricated Bridge ElementsMiscellaneous Bridge ElementsConstructionLong-term performance of Prefabricated ElementsDesign and Analysis
21 Utah experience with ABC: Chapter 1IntroductionPurpose of the ManualWhy use ABC?Public perception of ABCPublic PerceptionUtah experience with ABC:Polling results
22 Chapter 2 ABC Technologies FHWA Every Day Counts ABC Toolbox Foundation and Wall ElementsRapid Embankment ConstructionPrefabricated Bridge Elements and SystemsStructural Placement MethodsFast Track ContractingContracting ProvisionsBest Value SelectionA+B and A+B+C BiddingIncentive and Disincentive ClausesWarrantiesLane RentalApplicability of ABC Technologies to Different Bridge ProjectsFHWA Every Day CountsABC Toolbox
25 Chapter 3 Planning and Scoping Projects ABC Decision Making process Is ABC Appropriate?Decision Process for Selection of ABC MethodsWhat type of ABC should I use?Defining the problemFlow charts for determination of appropriate ABC methodsStructure type selection analysis including overall project costsPublic Involvement
26 Chapter 3 Planning and Scoping 3 Basic types of ABC in use today Prefabricated Bridge Elements(LEGO bridges)Individual prefabricated elementsModular Prefabricated ElementsLarger components made up of several prefabricated elementsLarge Scale prefabricationFull structuresSPMT bridge movesLateral skidding/slidingBarge installations
27 Chapter 3 Planning and Scoping: Decision flowcharts Used to determine the appropriate methods of ABCConstruction with Prefabricated elements (LEGO Bridge) is always an optionIdentifies other potential optionsBased on the following assumptionsABC is already on the tableThe time and cost are not factors at this pointA time and cost analysis is recommended after determining the appropriate ABC methods for the site
28 Chapter 3Determination of appropriate ABC methods
29 Chapter 3Determination of appropriate ABC methods
30 Chapter 3Determination of appropriate ABC methods
31 Chapter 3Determination of appropriate ABC methods
32 Chapter 3 Once appropriate methods of ABC are determined Investigate all viable optionsTime for each optionTraffic management for each optionDetermine mobility ImpactsCalculate overall project costsDetermine User Costs
33 Chapter 4Utah ModelImplementing ABC in a Transportation Agency
37 Chapter 8 Long-term Performance Example: UDOT SPMT Bridge after 3 years in serviceLong-term PerformanceDurability of PBES based on lessons learnedCase StudiesConventional ConstructionSPMT InstallEdison Bridge in Florida15 years in serviceCorrosive environmentConclusion: Cracking in deck is no worse than conventional construction (better in some cases)
38 Chapter 9 Design and Analysis Design of bridges for SPMT moves Precast SubstructuresIntegral AbutmentsCantilever abutmentPiersFull Depth Deck PanelPost tensioningIssues not covered in LRFDMechanical Connectors in hinge zones - seismicCorrugated void shear capacity
39 Appendices Design Examples and Guidance Full depth precast deck panelsPrecast Concrete PiersPrecast Integral AbutmentsErection and Lifting calculations for deck panelsReference Documents that contain Design InformationStandard and Proprietary ProductsSample Construction SpecificationsUDOT – Precast Substructure ElementsUDOT – Precast Concrete Deck PanelsUDOT – Bridge Construction using Self Propelled Modular TransportersUDOT – Structural Lightweight ConcreteMassDOT – High Early Strength Concrete
40 Manual Distribution Availability Published in November 2011 Available On-LineFree DownloadSome of these technologies are new to the States who submitted an application
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