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Smart Structures and Systems
  Volume 14, Number 4, October 2014, pages 595-615

A case study of damage detection in four-bays steel structures using the HHT approach
Wen-Ko Hsu, Dung-Jiang Chiou, Cheng-Wu Chen, Ming-Yi Liu, Wei-Ling Chiang and Pei-Chiung Huang

    This study aims to investigate the relationship between structural damage and sensitivity indices using the Hilbert-Huang transform (HHT) method. Two damage detection indices are proposed: the ratio of bandwidth (RB), and the ratio of effective stiffness (RES). The nonlinear four bays multiple degree of freedom models with various predominant frequencies are constructed using the SAP2000 program. Adjusted PGA earthquake data (Japan 311, Chi-Chi 921) are used as the excitations. Next, the damage detection indices obtained using the HHT and the fast Fourier transform (FFT) methods are evaluated based on the acceleration responses of the structures to earthquakes. Simulation results indicate that, the column of the 1st floor is the first yielding position and the RB value is changed when the RES<90% in all cases. Moreover, the RB value of the 1st floor changes more sensitive than those from the top floor. In addition, when the structural response is nonlinear (i.e., RES<100%), the RB and the RES curves indicate the incremental change in the HHT spectra. However, the same phenomenon can be found from FFT spectra only when the stiffness reduction is large enough. Therefore, the RB estimated from the smoothed HHT spectra is an effective and sensitive index for detecting structural damage.
Key Words
    HHT; damage detection index; effective stiffness; sensitivity
Wen-Ko Hsu and Dung-Jiang Chiou:Research Center for Hazard Mitigation and Prevention, National Central University, Jhung-li, Taoyuan County, Taiwan, R.O.C.
Cheng-Wu Chen: Department of Maritime Information and Technology, National Kaohsiung Marine University,
Kaohsiung 80543, Taiwan, R.O.C.;
Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Ming-Yi Liu: Department of Civil Engineering, Chung Yuan University, Jhung-li, Taoyuan County, Taiwan, R.O.C.
Wei-Ling Chiang and Pei-Chiung Huang: Department of Civil Engineering, National Central University, Jhung-li, Taoyuan County, Taiwan, R.O.C.


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