SHRP2 Project R04 Bridge Designs for ABC. Bala Sivakumar HNTB Corp. FHWA P2P Exchange Aug. 2012 Boston. 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.
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FHWA P2P Exchange
Aug. 2012 Boston
Phase II – Identify & Refine the Best ABC Technologies
Phases III & IV – Standardize & Deploy ABC
Phase V – Beta testing of ABC Toolkit by VAOT
SHRP2 Project R04
To develop standardized approaches to designing, constructing, and reusing complete bridge systems that address rapid renewal needs
INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL
2008 -- 2013
Iowa State University
Structural Engineering Assoc.
Dr Monica Starnes, Senior Program Officer SHRP2
Phase IV (2011-2013)
SHRP2 R04 -- Phases I, II, III
(2008 – 2011)
ABC STANDARD DESIGN CONCEPTS
ABC ERECTION CONCEPTS
ABC SAMPLE DESIGN CALCULATIONS
ABC DESIGN SPECIFICATIONS (LRFD)
ABC CONSTRUCTION SPECIFICATIONS
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.
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
2 Lane bridge with shoulders shown – customize width for site
Deck Bulb Tees
Modular Decked Beams
Decked Bulb Tee
Span lengths from 40 ft to 130 ft
UT, WA, ID among states with DBT standards
Based on the PCI NEXT beam
Spans to 90 ft
Low depth alternative
Adjacent Double Tee
ABUTMENTS & WINGWALLS
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 backwallis precast with the deck.
Fast erection in 1 to 2 days, economical
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
Longitudinal steel not shown)
Erection Concept Drawings
Erection using conventional cranes.
Erection using ABC construction technologies adapted from long span construction
Short Single Span over Stream Cranes selected for 90 Kip pick
Longer Span over Roadway
Weight up to 200 kips
Allows fast rate of erection
Rides on existing bridge, new bridge(check capacity to support)
Ideal for bridges with many spans. long viaducts
Transverse Gantry Frame
Longitudinal Gantry Frame
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.
The design examples provide guidance on the overall structural design of bridge components for ABC
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.
Prefabrication Stage (many support options)
Erection Stage (many lift options)
Proposed Section in LRFD Construction Specifications
XX.6 QUALITY ASSURANCE
XX.7 Handling, Storing, and Transportation
XX.8 Geometry Control
XX.10 ERECTION METHODS
XX.11 ERECTION PROCEDURES
2012/ 2013 Construction
I-84 EB & WB Bridges
over Dingle Ridge Road
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