Comparative vulnerability analysis of decomposed signal for the LRB base-isolated structure under pulse-like ground motions. (1st November 2022)

• Record Type: Journal Article
• Authors: Zhao, Dahai; Wang, Huiwei; Qian, Hui; Liu, Jianming
• Is Part Of: Journal of building engineering. Volume 59(2022)
• Publication Date: 2022-11-01
• Subjects: Vulnerability analysis -- Decomposed signal -- Base-isolated structure -- Incremental dynamical analysis -- Pulse-like ground motions; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.105106
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: The pulse signal is the most significant component in the pulse-like ground motion. The investigation of the pulse signal in the pulse-like ground motion has become a focus in earthquake engineering. In this study, the pulse signal is extracted from the near-fault pulse-like ground motion by wavelet packet transform, and the residual signal of the original signal is also retained. The near-fault pulse-like ground motions are decomposed into 2 N groups of wavelet coefficients by wavelet packet transform. Several groups of wavelet coefficients, which cumulative energy ratio is more than 70%, are used to reconstruct the pulse signal. The vulnerability performance for the lead rubber bearing (LRB) base-isolated structure under the original signal, pulse signal, and residual signal are compared, respectively. The vulnerability performance analysis of the LRB base-isolated structure under the above three signals is completed by the incremental dynamical analysis (IDA) method, respectively. The numerical results indicate that the pulse signals in the pulse-like ground motions will amplify the responses of the LRB base-isolated structure, and the quantitative analysis results are also given. The influence of the residual signals on the LRB base-isolated structure is relevantly small, which is similar to the influence of the non-pulse ground motions on the same LRB base-isolated structure. Highlights: The pulse-like ground motion motions are decomposed for the extracted signal and the residual signal. The selection of pulse-like ground motions is obeyed for normal distribution. The envelope curves of 80 IDA curves are used to represent the IDA curve for each signal. The influence on the LRB base-isolated structure under the three signals exists in a stable proportion relationship.