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SHRP2 Project R04 Bridge Designs for ABC Bala Sivakumar HNTB Corp. FHWA P2P Exchange Aug. 2012 Boston.

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Presentation on theme: "SHRP2 Project R04 Bridge Designs for ABC Bala Sivakumar HNTB Corp. FHWA P2P Exchange Aug. 2012 Boston."— Presentation transcript:

1 SHRP2 Project R04 Bridge Designs for ABC Bala Sivakumar HNTB Corp. FHWA P2P Exchange Aug Boston

2 SHRP2 Project R04 PROJECT GOAL To develop standardized approaches to designing, constructing, and reusing complete bridge systems that address rapid renewal needs Phase I – Define ABC Challenges Phase II – Identify & Refine the Best ABC Technologies Phases III & IV – Standardize & Deploy ABC Phase V – Beta testing of ABC Toolkit by VAOT

3 SHRP2 Project R04 INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL HNTB (Prime) Iowa State University Structural Engineering Assoc. Genesis Structures Dr Monica Starnes, Senior Program Officer SHRP2

4 ABC ELEMENTS & METHODS SHRP2 R04 -- Phases I, II, III (2008 – 2011) Phase IV ( )

5 SHRP2 R04 ABC Toolkit Expected Outcome: The designer, guided by the standard design concepts, details and the set of ABC design calculations will be better prepared to complete an ABC design for a routine bridge replacement project. 1 ABC STANDARD DESIGN CONCEPTS ABC SAMPLE DESIGN CALCULATIONS ABC ERECTION CONCEPTS 5 ABC CONSTRUCTION SPECIFICATIONS ABC DESIGN SPECIFICATIONS (LRFD)

6 ABC Standard Design Concepts Focus on conventional bridges Complete bridges using prefabricated elements Contractor could self-perform a lot of the work Fabricate on site or in a plant and erect using conventional cranes Fast assembly in the field in 1 to 2 weeks (Tier 3 or less) Durable connections / durable bridges GOALS:

7 Span Ranges for Superstructures Simple / continuous spans from 40 ft to 130 ft. Simple for DL ; Continuous for LL ; No Open Joints Plans are grouped in the following span ranges: – 40 ft to 70 ft – 70 ft to 100 ft – 100 ft to 130 ft. Spans to 130 ft can usually be transported and erected in one piece at many sites. Weight < 200 Kips for erection using conventional cranes commonly used by contractors

8 Prefabricated Decked Beam Elements Deck Bulb Tees Double Tees Modular Decked Beams 2 Lane bridge with shoulders shown – customize width for site

9 Modular Decked Beams Barrier can be precast Barrier load on exterior module

10 Prestressed Decked Girders Based on the PCI NEXT beam Spans to 90 ft Low depth alternative Decked Bulb Tee Span lengths from 40 ft to 130 ft UT, WA, ID among states with DBT standards Adjacent Double Tee

11 Prefabricated Substructure Elements ABUTMENTS & WINGWALLS – Semi Integral Abutments – Integral Abutments – Inline or U type Wingwalls – Supported on Piles and Spread Footings PIERS – Precast Conventional Pier – Precast Straddle Bent – Drilled Shaft and Spread Footing Options

12 Integral and Semi-Integral Bridges for Rapid Renewal Well suited for ABC They allow the joints to be moved beyond the bridge Close tolerances required when utilizing expansion bearings and joints are eliminated The backwall is precast with the deck. Fast erection in 1 to 2 days, economical

13 Semi-Integral Abutment Suspended Backwall H piles or spread footings Fill pile pockets with SCC Easy fit-up in the field

14 Precast Piers Conventional Pier Straddle Bent Deep foundation may be outside existing footprint Non-prestressed so contractor can self- perform precasting Fast erection using grouted splice couplers

15 ABC Connections Connections affect field assembly time. Goal is rapid field assembly and long-term durability of joints Also, flexural continuity between modules to emulate CIP construction Connections affect seismic performance REFERENCE: FHWA Connections Manual

16 Connections for ABC – Ultra High Performance Concrete (UHPC) longitudinal & transverse joints between superstructure modules – Grouted splice couplers in piers replace the typical lap splice – Self Consolidating Concrete (SCC) pile connections and abutment to wingwall connections …………………………………………………………………………………… – Grouted cap pockets / grouted ducts for substructure connections (seismic) – Other rapid set concrete options may be used

17 Grouted Splice Coupler

18 Allows rapid construction. No post tensioning required UHPC joints are typically 6 in wide. Good durability Can be reinforced with hairpin bars or straight bars UHPC Joints in Bridge Deck (Longitudinal Joint. Longitudinal steel not shown)

19 Erection Concept Drawings Erection using conventional cranes. Erection using ABC construction technologies adapted from long span construction Erection Concepts for Prefabricated Elements

20 Erection Concepts for Bridge Replacement Using Cranes Short Single Span over Stream Cranes selected for 90 Kip pick Longer Span over Roadway Weight up to 200 kips

21 Erection with ABC Construction Technologies Use ABC construction technologies where ground access for cranes below the bridge may be limited. Conventional cranes with enough reach ABC technologies that allow construction from above: – Above Deck Driven Carriers – Launched Temporary Bridge – Transverse Gantry Frames – Longitudinal Gantry Frames

22 Above Deck Driven Carriers Allows fast rate of erection Rides on existing bridge, new bridge (check capacity to support) Ideal for bridges with many spans. long viaducts

23 Launched Temporary Bridge Sites with limited ground access or long spans Launched across or lifted over a span to act as a “temporary bridge” Used to deliver the heavier modules without inducing large erection stresses. Temp bridge can also support transverse gantry frames

24 Gantry Frames Longitudinal Gantry Frame Transverse Gantry Frame

25 The LRFD Design Specifications do not explicitly deal with the unique aspects of large scale prefabrication In some cases, the most extreme load case may occur during shipping and handling. The work in SHRP2 R04 entailed the identification of any shortcomings in the current LRFD Bridge Design Specifications Recommendations are provided for addressing these limitations. ABC Design Specifications for LRFD

26 ABC Sample Design Calculations Three ABC design examples for prefabricated systems in the toolkit: – Modular Decked Beams – Decked Precast Prestressed Girder – Precast Pier Design Criteria: AASHTO LRFD (5 th Edition) Supplemental ABC criteria The design examples provide guidance on the overall structural design of bridge components for ABC

27 LRFD for ABC Design The design of most ABC elements and systems follows traditional LRFD design specifications. Design the ABC elements and the completed structure using all applicable LRFD Limit States Additional requirements apply for ABC connections, lifting and moving of prefabricated elements and modules.

28 Decked Steel Girder Design for ABC Three Stages for Design Prefabrication Stage (many support options) – Load Case 1 = Dead load on module steel section only – Load Case 2 = Dead load on module composite section Erection Stage (many lift options) – Load Case 3 = Modules are lifted into place Final Stage – Load Case 4 = Modules are assembled and made continuous » DL » FWS » LL + IM » Utilities

29 Recommended Special Requirements for ABC Focus heavily on means and methods requirements for rapid construction. Proposed Section in LRFD Construction Specifications XX.1 GENERAL XX.2 RESPONSIBILITIES XX.3 MATERIALS XX.4 FABRICATION XX.5 SUBMITTALS XX.6 QUALITY ASSURANCE XX.7 HANDLING, STORING, AND TRANSPORTATION XX.8 GEOMETRY CONTROL XX.9 CONNECTIONS XX.10 ERECTION METHODS XX.11 ERECTION PROCEDURES ABC Construction Specifications

30 First Demonstration Project Demonstrate Use of ABC Concepts Developed in SHRP2 R04 Keg Creek Bridge, Iowa – Total prefabricated bridge – ABC design concepts & details developed in SHRP2 R04 Project were used with minimal customization for the site  14 day ABC period  Opened Nov 1, 2011

31 SHRP2 R04 ABC Demonstration Project #2 Lateral Slide (NYSDOT) 2012/ 2013 Construction Overnight replacement I-84 EB & WB Bridges over Dingle Ridge Road

32 Closing New generation PBES for ABC are economical to construct and designed for durability SHRP2 R04 ABC Toolkit and training materials will be available to provide guidance to those new to ABC and the use of PBES SHRP2 R04 demonstration projects showcase the use of the Toolkit SHRP2 R04 ABC Toolkit to be available soon The time for ABC is now


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