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Analysis and Design of Gravity Flow Conduits and Buried Bridges

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Descripción

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.


Características

  • ISBN: 9781498747820
  • Páginas: 246
  • Tamaño: 17x24
  • Edición:
  • Idioma: Español
  • Año: 2025

Disponibilidad: 24 horas

Contenido 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.

TABLE CONTENTS

1. Introduction.


1.1 Overview
1.2 Codes and units
1.3 Organization
References

2 Basics of soil-conduit systems

2.1 Definitions
2.2 Rigid conduits
   2.2.1 Arching
   2.2.2 Vertical soil load
   2.2.3 Lateral soil support
   2.2.4 Bedding support
2.3 Flexible conduits
   2.3.1 Deflection
   2.3.2 Hoop compression
   2.3.3 Bedding support
2.4 Noncircular conduits
References

3. Conduit Materials and General Conduit Behavior.

3.1. Conduit materials
   3.1.1. Concrete
   3.1.2  Metal
   3.1.3. Plastics
3.1.3 Plastics
    3.2 Ring theory – properties of round conduits
       3.2.1 Conduit characterization
       3.2.2 Quality control tests
    References

4 Soils and soil models

4.1 Soil classification systems
   4.1.1 AASHTO soil classification system
   4.1.2 ASTM soil classification system
   4.1.3 International Standards Organization (ISO) soil classification
   4.1.4 Soil groups used for conduit embedment
4.2 Unit weight (density) testing
4.3 Stiffness versus unit weight
   4.3.1 Modulus of soil reaction, E’
   4.3.2 Nonlinear soil models
   4.3.3 Constrained (one-dimensional) modulus
   4.3.4 Soil groups corresponding to Ms parameters
   4.3.5 Compactability
4.4 Controlled low-strength material (flowable fill)
Reference

5 Soil-conduit interaction

5.1 Behavior of elastic systems
   5.1.1 Interaction parameters
   5.1.2 Conduit response to soil load
   5.1.3 Soil stresses around a conduit
5.2 Earth pressure distribution and load theories for design
   5.2.1 Flexible conduits – Spangler pressure distribution
   5.2.2 Rigid conduits
5.3 Vehicle loads on buried conduits
5.4 Special aspects of soil-conduit interaction
   5.4.1 Load reduction techniques
   5.4.2 Compaction effects during construction
   5.4.3 Longitudinal loading
References

6 Finite element analysis

6.1 Introduction
6.2 2D versus 3D analyses
6.3 CANDE and other commercially available software
6.4 Performance and limitations of finite element analysis
References

7 Structural design of soil-conduit systems

7.1. Load and resistance factor design
7.2  Limit states
7.3. Load and resistance factors
7.4 Vehicular (live) loads
  7.4.1 Live load modifiers
  7.4.2 Distribution of live loads to conduits
7.5 Structural design of concrete conduits
  7.5.1 Concrete box conduits
  7.5.2 Circular, elliptical, and arch concrete conduits
  7.5.3 Reinforcement design of concrete conduits
  7.5.4 Concrete conduits for jacked installations
7.6 Structural design of metal conduits
   7.6.1 Metal pipe, pipe arch, arch structures, and steel-reinforced thermoplastic conduits
   7.6.2 Long-span structural plate structures
   7.6.3 Deep corrugated structural plate structures
   7.6.4 Structural plate box structures
7.7 Plastic conduits
    7.7.1 Flexibility and limit states
    7.7.2 Thermoplastic conduits
    7.7.3 Fiberglass conduits
References

8 Installation and construction monitoring

8.1 Site conditions and personnel safety
8.2.Backfill and trench terminology
   8.2.1 Embedment zone soil groups  
    8.2.2 Migration
8.3 Excavation
    8.3.1 Trench width
    8.3.2 Trench wall supports
8.4 Trench preparation
   8.4.1 Foundation
   8.4.2 Bedding
   8.4.3 Pipe laying
8.5 Backfilling
8.6 Construction monitoring
   8.6.1 During construction
   8.6.2 After construction
   8.6.3 Inspection follow up
References

9 Experiences with conduit performance

9.1 Understanding Soil-conduit interaction (unpublished)
   9.1.1 Background
   9.1.2 Investigation
   9.1.3 Conclusions
9.2 Faulty construction practices, incompatible embedment materials (Selig
   9.2.2 Investigation
    9.2.3 Conclusion
9.3 Poor construction management, poor construction practices, failure to seek guidance (McGrath and Selig, 1994)
   9.3.1 Background
   9.3.2 Specifications
   9.3.3 Investigation
   9.3.4 Conclusions
9.4 Contractor not following installation instructions (not published)
   9.4.1 Background
   9.4.2 Investigation
   9.4.3 Conclusions
9.5 Remediation of soft in situ soils (Heger and Selig, 1994)
   9.5.1 Background
   9.5.2 Investigation
   9.5.3 Conclusion
9.6 Inadequate space for compaction and inadequate cover depth during compaction (unpublished)
   9.6.1 Background
   9.6.2 Investigation
   9.6.3 Conclusions
References
Index


 

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