Design and detailing of diaphragms in threaded rod continuity systems

Alec J. Stubbe, Kromel Hanna, George Morcous, Maher K. Tadros

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

Abstract

Threaded Rod (TR) continuity system allows the girders to be continuous for deck weight in addition to live load. The bridge becomes continuous for approximately two-thirds of the total load which improves its load-carrying capacity, reduces deflections and deck cracking, and increases span-to-depth ratio. In this system, the precast prestressed concrete I-girders are connected at intermediate supports with high strength threaded rods above the top flange to resist the tension force and with concrete diaphragm to resist the compression force. This paper presents the TR continuity system and its advantages over conventional systems. In addition, this paper will propose the third generation TR continuity system and its advantages over previous TR continuity systems. The effects of bottom flange steel plates in comparison with confinement steel are presented in this paper. The required concrete strength of the diaphragms with proper detailing and reinforcement is investigated and presented in the paper as well.

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 - 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

Keywords

  • Bottom flange confinement
  • Continuity
  • Diaphragm
  • Multi-span bridges
  • NU-I girders
  • Threaded rod continuity system

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

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