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Structures Design

Structures Design

EDC - Prefabricated Bridge Elements & Systems

Picture of the MainStreet Bridge in Florida

Website Overview - Video (WMV)


Every Day CountsPlans Preparation Manual (PPM), Volume 1, Section 26.9.2.9  provides expanded direction for investigating prefabricated bridge alternates during the Bridge Development Report (BDR) phase of design. The referenced section of the PPM formalizes the process for evaluating whether prefabricated options should be considered based on feasibility questions, then, when warranted, how to develop and select prefabricated options through an assessment matrix. An assessment matrix methodology allows for alternate selection based on less than perfect knowledge. Both direct and indirect costs for prefabricated and conventional options are to be reported in the BDR. See PPM Exhibit 26-F for additional background information.

This website is intended to provide design guidance for developing prefabricated bridge alternates and gives examples on how to estimate both direct and indirect costs. To date, the FDOT does not have sufficient historical bid data for prefabricated bridge alternates in order to develop reasonable cost estimates from average unit material costs. To fill this gap, the Structures Design Office has developed several training videos for the purpose of educating designers on factors for consideration related to use of PBES for Accelerated Bridge Construction (ABC). Sample contractor estimates are provided to show how project costs may be developed to compare conventional construction methods versus a prefabricated ABC approach.
New The 2015 FDOT Structures Manual has been released.
Chapter 25 of the Structures Detailing Manual (SDM) has been added and provides design considerations for detailing PBES for FDOT contract plans.  A compilation of PBES concepts with annotated notes to designers that supplement this new chapter of the SDM is provided here (PDF).
 

FDOT Accelerated Bridge Overview of Policies and Innovative Contracting Strategies - WMV

Six (6) Barriers to PBES Implementation - Taking PBES out of the Lab and into the Wider World WMV

Case Studies: Considerations for Prefabricated ABC Approach

Case Study Description Presentation Video Presentation Notes Alternate Comparison Outline
1 Bridge Replacement In Close Proximity to Major Interstate-to-Interstate Interchange WMV (9:04) PDF PDF
2 Major Intercoastal Waterway Crossing Bridge Replacement WMV (8:43) PDF PDF
3 Replacement Bridge Serving as Ingress/Egress Route to Major Port WMV (5:27) PDF PDF
4 Braided Ramp Over Ingress Into International Airport WMV (6:30) PDF PDF
5 Widening of Long Low-Level Bridge Located Over a Floodplain and a Navigable River WMV (8:04) PDF PDF
6 Construction of a Long Bridge Viaduct Located in the Median of an Existing Interstate WMV (7:37) PDF PDF
7 Construction of a Fairly Long Bridge Viaduct Located in the Median of an Existing Busy Roadway WMV (12:47) PDF PDF

Case Studies: Cost Comparisons between Conventional Versus Prefab Construction

Case Study Description Presentation Video Presentation Notes Estimator's Notes
Prefabricated Alternate Conventional Alternate
1 Interstate Bridge Replacements over Local Road in Urban Environment WMV (18:55) PDF PDF PDF
2 Interstate Bridge Replacements over Proposed Rail Transit Corridor WMV (11:05) PDF PDF PDF
3 Multiple Bridge Replacements over Proposed Rail Transit Corridor WMV (5:48) PDF PDF PDF
4 Bridge Replacements over Interstate with Proposed Rail Transit Corridor WMV (7:27) PDF PDF PDF
5 High Level Bridge over Water: Edison Bridge, Ft. Myers, Florida WMV (12:45) PDF PDF PDF
6 Construction of Viaduct Located in Median of an Existing Busy Roadway WMV (10:30) PDF PDF PDF

Abbreviations

ABC = Accelerated Bridge Construction
BDR = Bridge Development Report
EDC = Every Day Counts
FIB = Florida I-Beam
MOT = Maintenance Of Traffic
PBES = Prefabricated Bridge Elements & Systems
PPM = Plans Preparation Manual
RUC = Road User Cost
SPMT = Self-Propelled Modular Transporter

Future Releases!

Local Bridge PBES Standards

Developmental Design Standards for:
  Full Depth Precast Transverse Deck Panels
  Precast Bent Caps