Title:
Functional Performance of Bridge Girders Strengthened with Post-Tensioned Near-Surface-Mounted Carbon Fiber- Reinforced Polymer
Author(s):
Yail J. Kim, Jae-Yoon Kang, Jong-Sup Park, and Woo-Tai Jung
Publication:
Structural Journal
Volume:
113
Issue:
2
Appears on pages(s):
239-250
Keywords:
carbon fiber-reinforced polymer (CFRP); complexity; nearsurface- mounted (NSM); post-tensioning; reliability; strengthening
DOI:
10.14359/51687801
Date:
3/1/2016
Abstract:
This paper presents the performance reliability and functional complexity of prestressed concrete girders strengthened with an emerging rehabilitation method using post-tensioned near-surfacemounted (NSM) carbon fiber-reinforced polymer (CFRP) strips. The influence of corrosion damage on the flexural capacity of the girders is theoretically predicted based on a stochastic approach, including an emphasis on chloride diffusion and concentration. A total of 1,650,000 cases having various CFRP-post-tensioning levels from 0 to 60% of the strength of CFRP are simulated, and corresponding results are analyzed. Predictive results indicate that the effect of corrosion becomes distressful with a time gap of 13.7 years after the initiation of corrosion from a practical point of view. The efficacy of the post-tensioned NSM CFRP in terms of preserving flexural strength and reducing vulnerability to deterioration is more pronounced with an increase in service year, based on a robust stress redistribution mechanism. Functional complexity is also reduced after strengthening, which can better achieve the given functional requirements of constructed bridge girders. Performance-based design factors are proposed, depending on service categories that are a function of traffic volume.