MODAL ANALYSIS FOR DAMAGE DETECTION OF REINFORCED CONCRETE COLUMNS AFTER FIRE
Many civil structures are subjected to damage due to overloading, and natural disasters or man-made hazards. Detection of damage in these structures as well as the prediction of their remaining life is of great economic and social value with respect to the safety of peoples asset and life. In this paper, vibration based damage detection techniques were employed to detect damage in reinforced concrete (RC) columns exposed to different levels of fire. Modal test and analysis was carried out for the RC columns in original condition at first. Then, the RC columns were put in fire. Finally, dynamic test on the damaged RC columns was carried out and changes in the dynamic characteristics of the columns before and after fire were examined. Two different methods including Eigen-System Realization Algorithm (ERA) and PolyMax method were employed to extract modal parameters of the columns before and after fire. The performance of the proposed methods is discussed. Lastly, the location of the damage is detected by employing the Co-Ordinate Modal Assurance Criterion (COMAC) method. Results show that the presence and the location of the damage of the RC columns after fire can be identified correctly.
modal analysis impact test damage detection ERA PolyMaz COMAC fire RC columns
Bin Xu Xu Gong Jing-Si Huo Jia-Guang Zhang
College of Civil Engineering, Hunan University, Changsha 410082, P.R. China Key Laboratory of Buildi College of Civil Engineering, Hunan University, Changsha 410082, P.R. China
国际会议
广州
英文
1590-1595
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）