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Computers and Concrete   Volume 20, Number 5, November 2017, pages 617-625
DOI: http://dx.doi.org/10.12989/cac.2017.20.5.617
 
Prestress and excitation force identification in a prestressed concrete box-girder bridge
Ziru Xiang, Tommy H.T. Chan, David P. Thambiratnam and Andy Nguyen

 
Abstract     [Buy Article]
    Prestress force identification (PFI) is crucial to maintain the safety of prestressed concrete bridges. A synergic identification method has been proposed recently by the authors that can determine the prestress force (PF) and the excitation force simultaneously in prestressed concrete beams with good accuracy. In this paper, the ability of this method in the application with prestressed concrete box-girder bridges is demonstrated. A reasonable assumption is made to capture the similarity of the dynamic behavior of the prestressed concrete box-girder bridge and a beam under a certain loading scenario, and the feasibility of this method for application in a prestressed box-girder bridge is affirmed. A comprehensive laboratory test program is conducted, and the effects of PF, excitation, measuring time and uncertainties are studied. Results show that the proposed method can predict the PF and the excitation force in a prestressed concrete box-girder accurately and has a great robustness against uncertainties.
 
Key Words
    prestress force identification; moving load identification; synergic identification; virtual distortion method
 
Address
Ziru Xiang, Tommy H.T. Chan, David P. Thambiratnam and Andy Nguyen: School of Civil Engineering and Built Environment, Queensland University of Technology, George St, Brisbane, Queensland 4000, Australia
 

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