期刊
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
卷 154, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.soildyn.2022.107162
关键词
Baseline correction; Near-fault ground motion; Hilbert energy spectral analysis; Baseline offset; Permanent displacement
资金
- National Natural Science Foun-dation of China [NNSFC51778206]
A new automatic baseline correction method based on the Hilbert spectral analysis is proposed to recover accurate baseline offset, permanent displacement, and stable peak ground motion displacement from raw ground motion records. The method eliminates the need for selecting the start time of strong motion and can extract complex frequency changes in the baseline offset time histories.
A new automatic baseline correction method based on the Hilbert spectral analysis (HSA) is proposed to recover a relatively reasonable time history of baseline offset, permanent displacement, and stable peak ground motion displacement (PGD) from a raw near-fault ground motion record. This method can get rid of the selection of the start time of strong motion (corresponding to t(1) in traditional methods) by an adaptive extraction procedure, then a stable PGD as well as an accurate permanent displacement can be obtained. For baseline offsets, there is no two-stage-segment assumption in this procedure, and the extracted time histories of these offsets include complex frequency changes, which is more consistent with the explanations of causes for baseline offsets. All causes of baseline offsets are treated as contaminants that exist in all frequency ranges in a record. Uncontaminated components can be extracted from the original record by the HSA, then information about strong motions can be retained as much as possible. The residual part is regarded as a heavily contaminated component of which the energy of the noise rivals that of the real ground motion. It is corrected based on only one time point. Finally, the corrected record is contributed by both of the uncontaminated and adjusted contaminated components. The HSA method, which depends on the energy distribution of original record in different frequency component, can obtain the baseline offset, PGD, and permanent displacement reasonably, stably, and automatically.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据