342R-16 Report on Flexural Live Load Distribution Methods for Evaluating Existing Bridges

342R-16 Report on Flexural Live Load Distribution Methods for Evaluating Existing Bridges

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Description

This report provides a synthesis of the topic of flexural live load distribution and its applicability to concrete bridges. Flexural live load distribution is critical to describing how loads are transmitted through a bridge system. This report is intended to provide engineers, including load rating engineers, with basic guidance on the methods and tools available for determining live load distribution behavior of in-service bridges. Included in the report are descriptions, a brief history, and background of the flexural load distribution phenomena and a summary of design and analysis methods used to describe the phenomena in practice. A series of case studies are presented in the latter part of the report to serve as a comparison summary of commonly used live load distribution methods and their performance in describing the behavior of in-service structures. The report also provides performing bridge load ratings with a practical synopsis of the various methods available for determining the live load distribution factor. While this report is limited to flexural live load distribution, it provides the foundation for a future committee guide on the in-service evaluation of concrete bridges.

Keywords: bridge analysis; bridge load rating; distribution factor; equivalent beam analysis; finite element; grillage analysis; live load testing; load resistance; transverse flexural load distribution.

Document Details

Author: ACI Committee 342

Publication Year: 2016

Pages: 29.00

ISBN: 9780870319471

Categories: Bridges

Formats: Printed Document, PDF, ePub, or Kindle

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

CHAPTER 2—NOTATION AND DEFINITIONS

2.1—Notation

2.2—Definitions

CHAPTER 3—BASIS OF CODE CRITERIA FOR TRANSVERSE LIVE LOAD DISTRIBUTION

3.1—Introduction

3.2—Transverse load distribution

3.3—Empirical formulas for transverse live load distribution

3.4—AASHTO Standard Specification for Highway Bridges

3.5—AASHTO LRFD Bridge Design Specifications

3.6—Canadian Highway Bridge Design Code

3.7—American Railway Engineering and Maintenance-of-Way Association

3.8—Summary

CHAPTER 4—SUMMARY AND USE OF REFINED METHODS OF ANALYSIS

4.1—Introduction

4.2—General approach

4.3—Equivalent beam line method

4.4—Grillage analogy method

4.5—Three-dimensional frame analysis method

4.6—Finite element method

4.7—Summary

CHAPTER 5—IN-SERVICE EVALUATION AND LOAD RATING OF CONCRETE BRIDGES

5.1—Introduction

5.2—Load rating for concrete bridges

5.3—Load distribution for in-service evaluation and load rating

5.4—Load testing

5.5—Characterizing lateral load distribution from load testing

5.6—Summary

CHAPTER 6—CASE STUDIES OF ANALYSIS METHODS AND LOAD TESTS

6.1—Introduction

6.2—Literature survey

6.3—Slab bridges

6.4—Simply supported concrete girder bridges (with concrete decks)

6.5—Continuous concrete girder bridges (with concrete decks)

6.6—Steel girder bridges (with concrete decks)

6.7—Summary

6.8—Synthesis of case studies

6.9—Recommendations from findings

CHAPTER 7—SUMMARY AND CONCLUSIONS

7.1—Refined analysis methods

7.2—Load testing and instrumentation

7.3—Bridge types

7.4—Correlation of distribution factors

CHAPTER 8—REFERENCES

Authored documents

ERRATA INFO

Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the Manual of Concrete Practice (MCP). For a listing of and access to all product errata, visit the Errata page.

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