345.2R-98
Guide for Widening Highway Bridges(Reapproved 2005)
1998, 14 pp.
$36.50

Many highway bridges become functionally obsolete due to inadequate width before they become structurally deficient. Because widening is almost always more economical than complete replacement, there is a need to make available the results of research and field experience pertaining to the widening of bridges. This guide discusses many problems that are unique to the widening of existing concrete bridges and bridges with concrete decks. The primary focus of this document is on bridge deck. However, substructure issues are also raised and discussed. The effects of differential movements due to traffic on the existing and new portions, including movements due to traffic on the existing structure during construction, are discussed. General recommendations are made pertaining to the choice of structure type, design details and construction methods and materials.

Contents:
Chapter 1: Introduction

1.1 Purpose

1.2 Common widening considerations

Chapter 2: General Design Considerations

2.1 General

2.2 Selection of structure type

Chapter 3: Design & Construction Details

3.1 General

3.2 Concrete Removal

3.3 Refinishing exposed areas of the deck

3.4 Traffic-induced vibrations and deflections

3.5 Avoidance of damage due to dead load deflections

3.6 Closure placement details

3.7 Substructure details

Chapter 4: Summary

4.1 Sumary of recommendations

Chapter 5: References

5.1 Recommended references

5.2 Cited references