Non-stationary property in frequency content of horizontal ground motion vectors
The non-stationary properties of the strong ground motions are considered to have dominant influence on the dynamic response of structures. In this article, a new method is proposed to study the instantaneous frequency by constructing analytic signals with two orthogonal horizontal components of gro...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2019-04-01
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| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1177/1687814019841141 |
| _version_ | 1828836097807876096 |
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| author | Yinfeng Dong Ying Hu |
| author_facet | Yinfeng Dong Ying Hu |
| author_sort | Yinfeng Dong |
| collection | DOAJ |
| description | The non-stationary properties of the strong ground motions are considered to have dominant influence on the dynamic response of structures. In this article, a new method is proposed to study the instantaneous frequency by constructing analytic signals with two orthogonal horizontal components of ground motion vectors directly. Comparing with the traditional method of constructing analytic signals based on Hilbert transforms, the new method is digestible and simple in calculation, and it can also avoid some associated limits of Hilbert transform. In this article, instantaneous frequency obtained from the new method is simulated with an exponential decay model, and its attenuation rules which can be used for synthesizing design ground motions are investigated. By comparing the attenuation rules between vector and unidirectional ground motions, the difference between new method and traditional method are investigated. The results show that the new method of constructing analytic signals is feasible, and the exponential decay model is effective to describe the change of instantaneous frequency with time. |
| first_indexed | 2024-12-12T18:15:47Z |
| format | Article |
| id | doaj.art-48cd317f0f03464b8fa4220dce85eba9 |
| institution | Directory Open Access Journal |
| issn | 1687-8140 |
| language | English |
| last_indexed | 2024-12-12T18:15:47Z |
| publishDate | 2019-04-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-48cd317f0f03464b8fa4220dce85eba92022-12-22T00:16:16ZengSAGE PublishingAdvances in Mechanical Engineering1687-81402019-04-011110.1177/1687814019841141Non-stationary property in frequency content of horizontal ground motion vectorsYinfeng Dong0Ying Hu1School of Civil Engineering, Chongqing University, Chongqing, ChinaChina Railway Eryuan Engineering Group Co. Ltd, Chengdu, ChinaThe non-stationary properties of the strong ground motions are considered to have dominant influence on the dynamic response of structures. In this article, a new method is proposed to study the instantaneous frequency by constructing analytic signals with two orthogonal horizontal components of ground motion vectors directly. Comparing with the traditional method of constructing analytic signals based on Hilbert transforms, the new method is digestible and simple in calculation, and it can also avoid some associated limits of Hilbert transform. In this article, instantaneous frequency obtained from the new method is simulated with an exponential decay model, and its attenuation rules which can be used for synthesizing design ground motions are investigated. By comparing the attenuation rules between vector and unidirectional ground motions, the difference between new method and traditional method are investigated. The results show that the new method of constructing analytic signals is feasible, and the exponential decay model is effective to describe the change of instantaneous frequency with time.https://doi.org/10.1177/1687814019841141 |
| spellingShingle | Yinfeng Dong Ying Hu Non-stationary property in frequency content of horizontal ground motion vectors Advances in Mechanical Engineering |
| title | Non-stationary property in frequency content of horizontal ground motion vectors |
| title_full | Non-stationary property in frequency content of horizontal ground motion vectors |
| title_fullStr | Non-stationary property in frequency content of horizontal ground motion vectors |
| title_full_unstemmed | Non-stationary property in frequency content of horizontal ground motion vectors |
| title_short | Non-stationary property in frequency content of horizontal ground motion vectors |
| title_sort | non stationary property in frequency content of horizontal ground motion vectors |
| url | https://doi.org/10.1177/1687814019841141 |
| work_keys_str_mv | AT yinfengdong nonstationarypropertyinfrequencycontentofhorizontalgroundmotionvectors AT yinghu nonstationarypropertyinfrequencycontentofhorizontalgroundmotionvectors |