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Mathematical Problems in Engineering
Volume 2015, Article ID 946907, 12 pages
http://dx.doi.org/10.1155/2015/946907
Research Article

Assessing Static Performance of the Dashengguan Yangtze Bridge by Monitoring the Correlation between Temperature Field and Its Static Strains

1The Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Sipailou Road, Xuanwu District, Nanjing, Jiangsu 210096, China
2Department of Civil Engineering, Southeast University, Sipailou Road, Xuanwu District, Nanjing, Jiangsu 210096, China
3Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
4China Railway Major Bridge (Nanjing) Bridge and Tunnel Inspect & Retrofit Co., Ltd., Nanjing 210032, China

Received 30 August 2014; Accepted 9 October 2014

Academic Editor: Ting-Hua Yi

Copyright © 2015 Gao-Xin Wang 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

Taking advantage of the structural health monitoring system installed on the steel truss arch girder of Dashengguan Yangtze Bridge, the temperature field data and static strain data are collected and analyzed for the static performance assessment of the bridge. Through analysis, it is found that the static strain changes are mainly caused by temperature field (temperature and temperature difference) and train. After the train-induced static strains are removed, the correlation between the remaining static strains and the temperature field shows apparent linear characteristics, which can be mathematically modeled for the description of static performance. Therefore, multivariate linear regression function combined with principal component analysis is introduced to mathematically model the correlation. Furthermore, the residual static strains of mathematical model are adopted as assessment indicator and three kinds of degradation regulations of static performance are obtained after simulation of the residual static strains. Finally, it is concluded that the static performance of Dashengguan Yangtze Bridge was in a good condition during that period.