Smooth Acceleration Spectra for Pulse-Like Ground Motions
| Autor: | Cuihua Li, Guofeng Xue, Zhanxuan Zuo |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Bulletin of the Seismological Society of America. 110:2755-2765 |
| ISSN: | 1943-3573 0037-1106 |
| DOI: | 10.1785/0120200137 |
| Popis: | Idealization of acceleration response spectra is the basis for construction of target spectra for seismic design and assessment of structures. The adequacy of current methods to reasonably idealize (or smooth) the acceleration spectra of pulse-like and nonpulse-like ground motions is examined in this study. The influence of separated pulses on different regions of acceleration response spectrum is first investigated using wavelet transform. One representative method is selected as the benchmark to examine the effectiveness of the Newmark–Hall-based methods to smooth the acceleration spectra of pulse-like and nonpulse-like ground motions. Presented are some important insights into why the plateau (or amplification factor) associated with the constant-acceleration branch may be underestimated and the ending cutoff period Tg be overestimated by Newmark–Hall-based methods. This study highlights the intrinsic characteristics and the importance of the constant-acceleration branch, based on which a two-step procedure is proposed to idealize the acceleration spectra. The results show that the proposed methodology can accurately identify the constant-acceleration branch regardless of the influence of pulses on the descending branch of acceleration spectra. |
| Databáze: | OpenAIRE |
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