A case study of damage detection in four-bays steel structures using the HHT approach

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题名:	A case study of damage detection in four-bays steel structures using the HHT approach
作者:	蔣偉寧;Hsu, Wen-Ko;Chiou, Dung-Jiang;Chen, Cheng-Wu;Liu, Ming-Yi;Chiang, Wei-Ling;Huang, Pei-Chiung
贡献者:	工學院土木工程學系
关键词:	Acceleration;Damage detection;Earthquake construction;Earthquake damage;Nonlinearity;Seismic phenomena;Spectra;Stiffness;Structural damage;토목공학
日期:	2014-01-01
上传时间:	2026-04-21 13:38:31 (UTC+8)
出版者:	Techno Press;국제구조공학회
摘要:	摘要： 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. 出版者： 국제구조공학회 出版日期： 2014-10-01 出處： Smart Structures and Systems, 2014, An International Journal, 14(4), , pp.595-615 識別號： ISSN: 1738-1584 識別號： EISSN: 1738-1991 識別號： EISSN: 1738-1584 識別號： DOI: 10.12989/sss.2014.14.4.595
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