Title page for ETD etd-07232012-151038


Type of Document Master's Thesis
Author Woerheide, Andrew James
Author's Email Address woerheia@vt.edu
URN etd-07232012-151038
Title Structural Performance of Longitudinally Post-Tensioned Precast Deck Panel Bridges
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Roberts-Wollmann, Carin L. Committee Chair
Cousins, Thomas E. Committee Member
Eatherton, Matthew R. Committee Member
Keywords
  • prestress loss
  • shear studs
  • post-tensioning
  • deck panels
  • bridge deck
Date of Defense 2012-07-20
Availability unrestricted
Abstract
As the aging bridges and infrastructure within the US continue to deteriorate, traffic delays due to

construction will become more and more common. One method that can reduce delays due to bridge

construction is to use precast deck panels. Precast deck panels can significantly reduce the overall

length of the construction project. The panels can be manufactured ahead of time, and with higher

quality control than is possible in the field. One of the reasons precast deck panels are not widely

accepted is because of a lack of research concerning the required post-tensioning force, shear stud

pocket placement, and proper joint design.

In a recent dissertation (Swenty 2009) numerous recommendations were made for joint design, shear

stud pocket design, and post-tensioning force for full-depth precast deck panel bridges. Design

drawings were included for the replacement of a bridge located in Scott County, Virginia. The research

in this report focuses on the short-term and long-term testing of this bridge. The short-term testing

involved performing a live load test in which two trucks of known weight and dimensions were

positioned on the bridge in order to maximize the negative moment at the joints over the piers and

document strains and deflections at a number of other critical locations. The long-term testing involved

monitoring the strains within the deck and on one of the six girders for a number of months in order to

document the changes in strain due to creep and shrinkage. The results of these tests were compared

to 2D beam-line models and to the parametric study results of Bowers’ research on prestress loss within

full-depth precast deck panel bridges. It was determined that the bridge was acting compositely and

that the post-tensioning force was sufficient in keeping the joints in compression during testing.

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