Every Day CountsFDOT Design Manual (FDM), Volume 1, Section  provides expanded direction for investigating prefabricated bridge alternates during the Bridge Development Report (BDR) phase of design. The referenced section of theFDM 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 FDM Section 121.19 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.

Chapter 25 of the Structures Detailing Manual (SDM) 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.


FDOT Accelerated Bridge Overview of Policies and Innovative Contracting Strategies

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

Case Studies: Considerations for Prefabricated ABC Approach

Case StudyDescriptionPresentation NotesAlternate Comparison Outline
1Bridge Replacement In Close Proximity to Major Interstate-to-Interstate Interchange(1) ABC Notes PDF(1) ABC Outline PDF
2Major Intercoastal Waterway Crossing Bridge Replacement(2) ABC Notes PDF(2) ABC Outline PDF
3Replacement Bridge Serving as Ingress/Egress Route to Major Port(3) ABC Notes PDF(3) ABC Outline PDF
4Braided Ramp Over Ingress Into International Airport(4) ABC Notes PDF(4) ABC Outline PDF
5Widening of Long Low-Level Bridge Located Over a Floodplain and a Navigable River(5) ABC Notes PDF(5) ABC Outline PDF
6Construction of a Long Bridge Viaduct Located in the Median of an Existing Interstate(6) ABC Notes PDF(6) ABC Outline PDF
7Construction of a Fairly Long Bridge Viaduct Located in the Median of an Existing Busy Roadway(7) ABC Notes PDF(7) ABC Outline PDF

Case Studies: Cost Comparisons between Conventional Versus Prefab Construction

Case StudyDescriptionPresentation NotesEstimator's Notes
Prefabricated AlternateConventional Alternate
1Interstate Bridge Replacements over Local Road in Urban Environment(1) Notes PDF(1) Prefabricated PDF(1) Conventional PDF
2Interstate Bridge Replacements over Proposed Rail Transit Corridor(2) Notes PDF(2) Prefabricated PDF(2) Conventional PDF
3Multiple Bridge Replacements over Proposed Rail Transit Corridor(3) Notes PDF(3) Prefabricated PDF(3) Conventional PDF
4Bridge Replacements over Interstate with Proposed Rail Transit Corridor(4) Notes PDF(4) Prefabricated PDF(4) Conventional PDF
5High Level Bridge over Water: Edison Bridge, Ft. Myers, Florida(5) Notes PDF(5) Prefabricated PDF(5) Conventional PDF
6Construction of Viaduct Located in Median of an Existing Busy Roadway(6) Notes PDF(6) Prefabricated PDF(6) Conventional PDF


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