Title: Guide for Widening Highway Bridges

Author(s): ACI Committee 345

Publication: Structural Journal

Volume: 89

Issue: 4

Appears on pages(s): 451-466

Keywords: bridge decks; bridges (structures); bridge widening; deflection; concrete construction; formwork (construction); reinforced concrete; reinforcing steels; substructures; superstructures; traffic vibrations; Construction

DOI: 10.14359/3429

Date: 7/1/1992

Abstract:
Many highway bridges become functionally obsolete due to inadequate width long before they become structurally deficient. Since widening almost always is 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 decks. However, substructure issues are also raised and discussed. The effects of differential movements between 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.