Simplified LRFD Bridge Design

Simplified LRFD Bridge Design

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Features

  • Presents a "How To Use" the AASHTO LFRD Bridge Design Specifications approaches
  • Introduces LRFD bridge design topics by presenting specific design examples. Design theories are explained to students after applications are given so they can see why those theories were developed.
  • Provides AASHTO LFRD Bridge Design Specifications references section numbers on pages where new material and formulas are introduced
  • Contains a comprehensive overview of the basic LRFD bridge design principles required to solve problems on the Civil and Structural PE exams
  • Serves as a reference book for practicing engineers, and as a classroom textbook for civil engineering students in a 3.0 credit course
  • Includes more than 135 illustrations

Summary

Developed to comply with the fifth edition of the AASHTO LFRD Bridge Design Specifications [2010]––Simplified LRFD Bridge Design is "How To" use the Specifications book. Most engineering books utilize traditional deductive practices, beginning with in-depth theories and progressing to the application of theories. The inductive method in the book uses alternative approaches, literally teaching backwards. The book introduces topics by presenting specific design examples. Theories can be understood by students because they appear in the text only after specific design examples are presented, establishing the need to know theories.

The emphasis of the book is on step-by-step design procedures of highway bridges by the LRFD method, and "How to Use" the AASHTO Specifications to solve design problems.

Some of the design examples and practice problems covered include:

  • Load combinations and load factors
  • Strength limit states for superstructure design
  • Design Live Load HL- 93
  • Un-factored and Factored Design Loads
  • Fatigue Limit State and fatigue life; Service Limit State
  • Number of design lanes
  • Multiple presence factor of live load
  • Dynamic load allowance
  • Distribution of Live Loads per Lane
  • Wind Loads, Earthquake Loads
  • Plastic moment capacity of composite steel-concrete beam
  • LRFR Load Rating

Simplified LRFD Bridge Design is a study guide for engineers preparing for the PE examination as well as a classroom text for civil engineering students and a reference for practicing engineers. Eight design examples and three practice problems describe and introduce the use of articles, tables, and figures from the AASHTO LFRD Bridge Design Specifications. Whenever articles, tables, and figures in examples appear throughout the text, AASHTO LRFD specification numbers are also cited, so that users can cross-reference the material.

Table of Contents

 

LRFD Method of Bridge Design

Limit States

Load Combinations and Load Factors

Strength Limit States for Superstructure Design

Resistance Factors, Φ, for Strength Limits

Design Live Load HL-93

Fatigue Live Load

Number of Design Lanes, NL

Multiple Presence Factor of Live Load, m

Dynamic Load Allowance, IM

Live Load Distribution Factors

Load Combinations for the Strength I Limit State

Simple Beam Live Load Moments and Shears Carrying Moving Concentrated Loads per Lane

Live Load Moments and Shears for Beams (Girders)

Design Examples

Design Example 1: Reinforced Concrete T-Beam Bridge

Design Example 2: Load Rating of Reinforced Concrete T-Beam by the Load and Resistance Factor Rating (LRFR) Method

Design Example 3: Composite Steel–Concrete Bridge

Design Example 4: Longitudinal Steel Girder

Design Example 5: Reinforced Concrete Slabs

Design Example 6: Prestressed Interior Concrete Girder

Design Example 7: Flexural and Transverse Reinforcement for 50 ft Reinforced Concrete Girder

Design Example 8: Determination of Load Effects Due to Wind Loads, Braking Force, Temperature Changes, and Earthquake Loads Acting on an Abutment

Practice Problems

Practice Problem 1: Noncomposite 60 ft Steel Beam Bridge for Limit States Strength I, Fatigue II, and Service

Practice Problem 2: 161 ft Steel I-Beam Bridge with Concrete Slab

Practice Problem 3: Interior Prestressed Concrete I-Beam References

Primary References

Supplementary References

Appendix A: Distribution of Live Loads per Lane for Moment in Interior Beams (AASHTO Table 4.6.2.2.2b-1)

Appendix B: Distribution of Live Loads per Lane for Moment in Exterior Longitudinal Beams

(AASHTO Table 4.6.2.2.2d-1)

Appendix C: Distribution of Live Load per Lane for Shear in Interior Beams (AASHTO Table 4.6.2.2.3a-1)

Appendix D: Distribution of Live Load per Lane for Shear in Exterior Beams (AASHTO Table 4.6.2.2.3b-1)

Appendix E: U.S. Customary Units and Their SI Equivalents

Index

Editor Bio(s)

Jai B. Kim, PE, PhD, is a professor emeritus of civil and environmental engineering at Bucknell University. He was department chairman for 26 years. Also, currently he is a bridge consultant (since 1980) and president of BKLB Structural Consultants, Inc. Recently he was a structural engineer at the Federal Highway Administration (FHWA). He has been active in bridge research for over 40 years, and was a member of the Transportation Research Board Committee of Bridges and Structures. He also served on the Structural PE Exam Committee of the National Council of Examiners and Surveying (NCEES) for many years. He holds a BSCE and MSCE from Oregon State University and a PhD from University of Maryland.

Robert H. Kim, PE, MSCE, is chief design engineer for BKLB Structural Consultants, Inc. He has extensive experience in the design, research, and construction of highway bridges. He has authored and presented several papers related to bridge engineering. Robert’s three books, Bridge Design for the Civil and Structural Professional Exams, Second Edition; Timber Design, Seventh Edition; and Civil Discipline Specific Review for the FE/EIT Exam are well-read by both students and engineers. In 2013, he is working on a bridge rehabilitation design in Connecticut. He holds a BS from Carnegie Mellon University and a MSCE from Penn State University.

Jonathan R. Eberle, BSCE is engaged in research with focus on the seismic design and analysis of structures at Virginia Polytechnic Institute and State University as a graduate student. He holds a BSCE from Bucknell University.

Contributors:

Dave M. Mante, MSCE performed a rigorous full-scale laboratory testing on an innovative concrete bridge deck system and he is performing research on prestressed concrete girders at Auburn University.

Eric J. Weaver, PE, M.Eng, performed research on fatigue and life-cycle analysis of steel truss bridges at Lehigh University. He worked for NASA’s space shuttle program and currently he is working as a structural engineer for Westinghouse Electric Co.

Editorial Reviews

"The book appears to be a simplified and organized approach to the basics of LRFD Bridge Superstructure Design and should serve as a good review and reference manual for the PE Examination."
––Stevan C. Wilver, Larson Design

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