Use of steel diaphragms in prestressed concrete bridges

Y. Frank Chen, Paul J. Navarro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Long-span prestressed concrete girders are traditionally braced with concrete diaphragms within the span. One of the common problems for prestressed concrete bridges is the deterioration or even the failure of diaphragms. Replacing the existing concrete diaphragms in a major highway bridge presents a real construction challenge as the traffic usually has to remain open at least partially. A good alternative is to use steel diaphragms, which have been shown to be cost effective and functional in several rehabilitated bridge projects. In addition to rapid construction and functionality, steel diaphragms are significantly lighter. As such, the live-load capacity of a bridge can be increased, which is an important issue for most existing bridges. This paper describes in detail the methodology of load and resistance factor design (LRFD) as related to steel diaphragms and their connections and presents an illustrative design example and the economical benefits of using steel diaphragms. Due to their practical and economical advantages, steel diaphragms are recommended for use in all rehabilitation projects involving prestressed concrete bridges. They may also be considered to be utilized in new reinforced or prestressed concrete bridges.

Original languageEnglish (US)
Title of host publication3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference
Subtitle of host publicationThink Globally, Build Locally, Proceedings
PublisherPrecast Prestressed Concrete Institute
ISBN (Electronic)9780937040904
StatePublished - Jan 1 2010
Event3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010 - Washington, United States
Duration: May 29 2010Jun 2 2010

Publication series

Name3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings

Other

Other3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010
CountryUnited States
CityWashington
Period5/29/106/2/10

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Civil and Structural Engineering

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