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Mathematical Problems in Engineering
Volume 2013, Article ID 631216, 9 pages
http://dx.doi.org/10.1155/2013/631216
Research Article

FBG-Based Creep Analysis of GFRP Materials Embedded in Concrete

1Key Laboratory of Ministry of Education for Geotechnique and Embankment Engineering, Hohai University, Nanjing, Jiangsu, China
2Highway and Railway Engineering Institute, Hohai University, Nanjing, Jiangsu, China
3Department of Civil Engineering, Shantou University, Shantou, Guangdong, China
4State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, China
5Geotechnical Research Institute, Hohai University, Nanjing, Jiangsu, China
6Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau

Received 14 October 2013; Accepted 29 November 2013

Academic Editor: Jun Li

Copyright © 2013 Guo-Wei Li 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

This paper presents a typical study regarding the creep interaction behavior between prestressed glass fiber reinforced polymer (GFRP) bar and concrete when this GFRP bar is subjected to a constant external pullout force. A number of optical fiber Bragg grating (FBG) sensors were mounted on GFRP bar surface by using an innovative installation method to measure strain distributions. Test results indicate that the complicated interaction at GFRP bar-concrete interface can be evaluated using a transitional factor. Variation trends of this transitional factor indicate three typical zones characterized by different strain/stress variation trends of the GFRP bar when prestress values are sustained at specific levels. These three typical zones include stress release zone, stress transition zone, and continuous tension zone. Test results also suggest that the instant stress loss at the interaction interface between concrete and GFRP bar was quite limited (less than 5%) in present test. Contributed proportion of each GFRP bar section was obtained to represent the creep behavior of the GFRP bar embedded in concrete. This investigation improved the understanding of the short-term interaction behavior between prestressed GFRP bar and concrete.