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International Journal of Polymer Science
Volume 2017, Article ID 3832468, 11 pages
https://doi.org/10.1155/2017/3832468
Research Article

Prestress Loss of CFL in a Prestressing Process for Strengthening RC Beams

1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
2State Key Laboratory of Building Science, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Xinyan Guo; nc.ude.tucs@ougyx and Peiyan Huang; nc.ude.tucs@gnauhyp

Received 29 September 2016; Revised 13 January 2017; Accepted 20 April 2017; Published 9 May 2017

Academic Editor: Giuseppina Amato

Copyright © 2017 Xinyan Guo et al. 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.

Abstract

A prestressing system was designed to strengthen reinforced concrete (RC) beams with prestressed carbon fiber laminate (CFL). During different prestressing processes, prestress loss was measured using strain gauges attached on the surface of CFL along the length direction. The prestress loss was 50–68% of the whole prestress loss, which is typically associated with CFL slipping between the grip anchors. Approximately 20–27% of the prestress loss was caused by the elastic shortening of the RC beam. An analytical model using linear-elastic theory was constructed to calculate the prestress loss caused by CFL slipping between the anchors and the elastic shortening of the strengthened beams. The compared results showed that the analytical model of prestress loss can describe the experimental data well. Methods of reducing the prestress loss were also suggested. Compared to other experiments, the prestressing system proposed by this research group was effective because the maximum percentage of prestress loss was 14.9% and the average prestress loss was 12.5%.