Comparative Field Study of Cable Tension Measurement for a Cable-Stayed Bridge
Publication: Journal of Bridge Engineering
Volume 18, Issue 8
Abstract
Cable tension is one of the important indexes of cable integrity as well as bridge stability and can be measured by various tension measurement methods. In this study, three widely used methods (i.e., the lift-off test, electromagnetic sensor method, and vibration method) have been implemented for two multistrand cables of a cable-stayed bridge under construction. The test bridge is Hwamyung Bridge in Korea, which has a prestressed concrete box girder. The field tests are executed during the second tensioning stage just after the installation of the key segment. The tensions are estimated before and after tensioning the cable and 5 days later (i.e., after finishing the tensioning of all the cables). The tensions measured by the three methods are compared with the design tension of the tensioning stage, and all three methods show very good performance in accuracy with minimal difference. Their cost and difficulty are compared based on test experiences. Additionally, an improved vibration method is proposed by ignoring apparent negative bending stiffness identified from measurement errors and validated in this test by improving the accuracy.
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Acknowledgments
This work was jointly supported by Smart Infra-Structure Technology Center (SISTeC) at KAIST sponsored by the National Research Foundation in Korea and the National Science Foundation of the United States (grant number 0937196), and the authors express gratitude for this support. We also appreciate Hyundai Engineering and Construction for their help and support in the field test and Dr. Shi Liu at NSF, who has been a driving force of this U.S.-Korea research collaboration.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 18 • Issue 8 • August 2013
Pages: 748 - 757
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 24, 2012
Accepted: Jun 5, 2012
Published online: Jul 21, 2012
Published in print: Aug 1, 2013
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