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Engineering Design, Fabrication and Erection of Prefabricated Bridge Elements and Systems
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Engineering Design, Fabrication and Erection of Prefabricated Bridge Elements and Systems
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  • Abstract:
    Through the Every Day Counts (EDC) program, the Federal Highway Administration (FHWA) has been taking initiatives to bring Accelerated Bridge Construction (ABC) technologies into the market that can help highway agencies build bridges faster and reduce adverse work zone impacts. The manual focuses on the design aspects of ABC using Prefabricated Bridge Elements and Systems (PBES). The purpose of the PBES/ABC design manual is to provide an overview of design, materials, and construction aspects of PBES; explore typical design, planning, and construction processes; identify how they relate to ABC; and offer guidance on where to obtain more information on each subject. The manual reviews the 4th Edition American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications for their applicability to the design of PBES elements. The manual covers the design aspects of prefabricated bridge superstructure, substructure and foundation elements. While the general design concepts are the same for both cast-in-place and prefabricated elements, this manual discusses subtle differences in the design approach and provide recommendation that are not are not well covered in the AASHTO LRFD Bridge Design Specifications. The design recommendations provided herein are based on research data, engineering judgment, and the concept of emulative design. The manual provides a discussion on the design of jointless decks and critical connections for durability, other precast elements including culverts, arches and frames and other miscellaneous elements. The manual covers the tolerance and quality control requirements for various elements. The manual also explores the effect of shipping, handling, and assembly on the design process. ABC projects often require the use of a wide variety of materials including conventional materials (e.g. steel, aluminum), new materials (e.g. polymers), or higher performance versions of conventional materials (e.g. ultra-high performance concrete). The manual explores the changes that can be made to materials that are commonly used in PBES/ABC projects. In addition, the manual also addresses the materials and construction related specification requirements, including sample specification language, for these materials.
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