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Appl. Sci. 2017, 7(8), 824; doi:10.3390/app7080824

Effect of Prestress Levels and Jacking Methods on Friction Losses in Curved Prestressed Tendons

College of Engineering, Sungkyunkwan University, Natural Sciences Campus, (16419) 2066 Seobu-Ro, Jangan-Gu, Suwon-Si, Gyeonggi-Do, Korea
Received: 21 June 2017 / Revised: 28 July 2017 / Accepted: 8 August 2017 / Published: 11 August 2017
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Abstract

The effects of prestressing methods and prestress levels on the friction losses of prestressed tendons were evaluated in this study. Two full-scale prestressed concrete girders were fabricated and used for the friction loss experiment. The prestress level was varied from 13% to 45% of the ultimate tensile strength of the prestressing tendon, and prestressing was performed by jacking one or both ends. The test results indicated that the actual friction loss measured at low prestress levels was up to 4.3 times higher than the theoretical friction loss. As the prestress level increased, the difference between the measured and theoretical friction losses gradually decreased, and the two eventually converged. On average, the ratio of the prestress force at the jacking end to the prestress force measured at midspan was 85.4% with jacking at both ends, and 81.1% with jacking at one end. View Full-Text
Keywords: prestress level; prestressed concrete girder; friction loss; prestressing method prestress level; prestressed concrete girder; friction loss; prestressing method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hong, S. Effect of Prestress Levels and Jacking Methods on Friction Losses in Curved Prestressed Tendons. Appl. Sci. 2017, 7, 824.

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