| Near-fault ground motion bi-normalized pseudo-velocity spectra and its applications |
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| 作者姓名： | 徐龙军 谢礼立 |
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| 作者单位： | School of Civil Engineering Harbin Institute of Technology，Harbin 150090 China |
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| 基金项目： | Foundation item： China Science Foundation of Postdoctoral Program （20060400826） and China National Science Foundation of the International （Regional） Cooperative Research Program （50420120133）. |
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| 摘 要： | Ground motions with forward-directivity effect in the near-fault region are obviously different from ordinary far-field ground motions. Design spectral models for this kind of motions have been proposed by correlating sim-ple pulses with parameters attenuation relationships in a previous study of the authors. To further test the applica-bility of the established design spectral model, we analyze ground motion pseudo-velocity response spectra (PVS), normalized pseudo-velocity spectra (NPVS) and bi-normalized pseudo-velocity spectra (BNPVS) of 53 typical near-fault forward-directivity ground motions. It is found that BNPVS not only has more salient features to reflect the difference between soil and rock sites, but also has less scattering to reveal the nature of forward-directivity motions. And then, BNPVS is used for prediction of design spectra accounting for the influence of site conditions, and the constructed design spectra are compared with those spectra established previously. It is concluded that site condition can heavily affect ground motions, buildings on rock can be even more dangerous than those on soil sites, in particular for ordinary buildings with short to middle vibration periods. Finally, pulse models are also suggested for structural analyses in the near-fault region.
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| 关 键 词： | 地面运动 近断层效应 方向性效应 脉冲 |
| 文章编号： | 1000-9116（2007）05-0544-09 |
| 收稿时间： | 4 April 2007 |
| 修稿时间： | 2007-04-04 |
Near-fault ground motion bi-normalized pseudo-velocity spectra and its applications |
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| Xu Long-jun,and Xie Li-li.Near-fault ground motion bi-normalized pseudo-velocity spectra and its applications[J].Acta Seismologica Sinica(English Edition),2007,20(5):544-552. |
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| Authors: | Xu Long-jun and Xie Li-li |
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| Institution: | 1. Engineering College, Ocean University of China, Qingdao 266100, China; 2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | Ground motions with forward-directivity effect in the near-fault region are obviously different from ordinary far-field ground motions. Design spectral models for this kind of motions have been proposed by correlating sim- ple pulses with parameters attenuation relationships in a previous study of the authors. To further test the applica- bility of the established design spectral model, we analyze ground motion pseudo-velocity response spectra (PVS), normalized pseudo-velocity spectra (NPVS) and bi-normalized pseudo-velocity spectra (BNPVS) of 53 typical near-fault forward-directivity ground motions. It is found that BNPVS not only has more salient features to reflect the difference between soil and rock sites, but also has less scattering to reveal the nature of forward-directivity motions. And then, BNPVS is used for prediction of design spectra accounting for the influence of site conditions, and the constructed design spectra are compared with those spectra established previously. It is concluded that site condition can heavily affect ground motions, buildings on rock can be even more dangerous than those on soil sites, in particular for ordinary buildings with short to middle vibration periods. Finally, pulse models are also suggested for structural analyses in the near-fault region. |
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| Keywords: | near-fault effect directivity effect pulse pseudo-velocity spectrum design spectra CLC number: P315 9 Document code: A |
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