Examining the effect of deck placement time on the behavior of composite pretensioned concrete bridge girders

Brian D. Swartz, Andrew Scanlon, Andrea J. Schokker

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

Abstract

The method for estimating prestress losses proposed by NCHRP Report 496 (Tadros, et al., 2003) was adopted into the AASHTO LRFD Bridge Design Specifications in the 2005 Interim Revisions (AASHTO, 2005). The new method introduced an approach that divided time-dependent behavior into two time periods: 1) before deck placement, and 2) after a cast-in-place composite deck is introduced in the system. The division has complicated the calculations for estimating prestress loss, especially since the design engineer often is not able to anticipate the time of deck placement with any certainty. This paper examines the need for the separation of the two time periods through comparisons with a rigorous time-stepping procedure for time dependent analysis which is developed within.

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

Keywords

  • Creep
  • Prestress loss
  • Shrinkage
  • Time-step

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