Analysis and Design of Gravity Flow Conduits and Buried Bridges

This book covers the structural analysis and design of buried gravity flow conduits, including traditional pipes, arches, box conduits, and buried bridges with spans up to 80 ft (25 m) and greater. The text primarily covers concrete, corrugated metal, and plastic conduits but is generally applicable to other materials. Applications include culverts, storm drains, sewers, and pedestrian and vehicular crossings.

The book is intended to introduce the subject to practitioners new to the field, as well as provide detailed information for those with prior experience. The opening chapter presents historical background and basic design models to introduce important concepts and then follows with chapters devoted to materials, soils, soil-conduit interaction, and guidance on the use of finite elements for analysis. Then design methods for evaluating soil-conduit systems are presented, along with guidance on important considerations during installation. The book concludes with field experiences of when things went wrong and why.

Analysis and Design of Gravity Flow Conduits and Buried Bridges offers a unified and comprehensive guide for practicing engineers working on buried pipe design, private consultants, and product manufacturers, as well as researchers in the area.

Timothy J. McGrath spent over 40 years with Simpson Gumpertz & Heger Inc. before becoming Principal with TJMcGrath, LLC. Most of his career has been involved in research, design, and investigation of gravity flow conduits. Much of his work has been incorporated into the American Association of State Highway and Transportation Officials (ASHTO) LRFD Bridge Design Specifications and other design standards.

This book encapsulates the analysis and design of buried gravity flow conduits, including pipe materials and soil materials and their interaction. These range from traditional pipes to open bottom concrete and corrugated metal culverts with spans of up to 25 metres, and include culverts, storm drains, sewers, and buried bridges. It begins with historical background and easily understandable design models then considers the properties of pipe materials and of pipe rings and backfill soils and the commonalities in their behavior. Finally, design methods consider the interaction of pipe and soil, along with simplified and computer methods. Much of this has been adopted by the AASHTO Committee on Bridges (responsible for highway culvert design) and other standards. The book will be important to any practicing engineer working on buried pipe design, including public engineers at all levels, private consultants, and product manufacturers, and will also suit researchers as a unified and comprehensive presentation.

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