1st Edition

Analysis and Design of Gravity Flow Conduits and Buried Bridges

By Timothy J. McGrath Copyright 2025
    280 Pages 130 B/W Illustrations
    by CRC Press

    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.

    1. Introduction.

    2. Basics of Soil-Conduit Systems.

    3. Conduit Materials and Behavior.

    4. Soils and Soil Models.

    5. Soil-Conduit Interaction.

    6. Finite Element Analysis.

    7. Structural Design of Soil-Conduit Systems.

    8. Installation and Construction Monitoring.

    9. Experiences with Conduit Performance.


    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 AASHTO LRFD Bridge Design Specifications Committee on Culverts and other design standards.