Evaluation of an Existing Steel Box Trunnion Girder and Its Posttensioned Anchors before Liftoff Testing: Case Study
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VIEW CORRECTIONPublication: Practice Periodical on Structural Design and Construction
Volume 20, Issue 4
Abstract
A case study on the analysis of an existing trunnion girder and its greased posttension anchors before load testing is presented herein. The analysis, which evaluates the member’s capacities using a finite-element model, also investigates the probability of a critical (nonredundant) anchor failing using test data recorded from both nondestructive dispersive wave propagation testing and load testing of similar anchors at other dams. The results of the analysis indicated a higher-than-expected probability of a critical anchor failing, which in a large enough flood event could fail the entire posttensioned anchorage system. In preparation for such an outcome, two contingency plans involving anchorage replacement and a steel exoskeleton wrapped around the trunnion girder with new anchors were developed and compared.
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Acknowledgments
The authors extend special thanks to Kevin Gerst P.E., S.E. of HDR, and Bob Lindyberg Ph.D., P.E. of FDH Engineering and Innovation, for their input and support on the publication of this paper.
Disclaimer
The views expressed are those of the authors and do not necessarily represent those of the U.S. Army COE.
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Published In
Practice Periodical on Structural Design and Construction
Volume 20 • Issue 4 • November 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 30, 2014
Accepted: Oct 28, 2014
Published online: Nov 14, 2014
Published in print: Nov 1, 2015
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