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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 AbutmentPractice 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
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