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Mathematical Problems in Engineering
Volume 2014, Article ID 734016, 10 pages
Research Article

Simplified Reliability Estimation for Optimum Strengthening Ratio of 30-Year-Old Double T-Beam Railway Bridge by NSM Techniques

1Department of Civil Engineering, Kangwon National University, 1 Joonang-ro, Kangwon, Samcheok 245-711, Republic of Korea
2Department of Civil Engineering, Gyeongnam National University of Science and Technology, 150 Chilam-dong, Jinju, Gyeongnam 660-758, Republic of Korea
3Research Division, G3Way Co., Yangjae-dong, Seocho, Seoul 20-32, Republic of Korea

Received 25 November 2013; Revised 3 March 2014; Accepted 4 March 2014; Published 11 May 2014

Academic Editor: Ting-Hua Yi

Copyright © 2014 Minkwan Ju 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.


This study is to develop simplified reliability estimation for optimum strengthening ratio of T-beam railway bridge strengthened by CFRP strip. Until now, strengthening design has been usually proceeded to satisfy the target load-carrying capacity by using the deterministic parameter of nominal property for concrete or FRP. For the optimum strengthening design, however, it is required that reliability-based strengthening design should be applied to effectively determine the amount of strengthening material and make sure of the safety of the structure. As applying the reliability-based strengthening ratio, more reliable strengthening design using CFRP strip is possible as well as having a structural redundancy. The reliability-based strengthening design methodology suggested in this study is able to contribute the optimum strengthening design for a concrete structure strengthened by CFRP strip.