[1]刘中宪,刘明珍,韩建斌.近断层沉积盆地强地震动谱元模拟[J].世界地震工程,2017,33(04):076-86.
 LIU Zhongxian,LIU Mingzhen,HAN Jianbin.Spectral-element simulation of strong ground motion in the near-fault alluvial basin[J].,2017,33(04):076-86.
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近断层沉积盆地强地震动谱元模拟
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《世界地震工程》[ISSN:/CN:]

卷:
33
期数:
2017年04期
页码:
076-86
栏目:
出版日期:
2017-11-25

文章信息/Info

Title:
Spectral-element simulation of strong ground motion in the near-fault alluvial basin
作者:
刘中宪12 刘明珍1 韩建斌3
1. 天津城建大学, 天津市土木建筑结构防护与加固重点实验室, 天津 300384;
2. 天津市地震工程研究所 天津 300384;
3. 珠海海控竹洲水乡发展有限公司, 广东 珠海 519000
Author(s):
LIU Zhongxian12 LIU Mingzhen1 HAN Jianbin3
1. Tianjin Key Laboratory of Structural Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;
2. Earthquake Engineering Research Institute of Tianjin City, Tianjin 300384, China;
3. Zhuhai Sea Control Bamboo Island Water Development Company Limited, Zhuhai 519000, China
关键词:
近断层沉积盆地强地震动动力学震源模型谱元法
Keywords:
near-fault alluvial basinstrong ground motiondynamic source modelspectral-element method
分类号:
TU378
摘要:
近断层强地震动特性与远场地震动特性具有显著差别。关于近断层沉积盆地地震响应规律,目前尚未厘清。为此利用基于有限断层假定的动力学震源模型,采用谱元法,详细研究了不同沉积内外介质波速比、走滑断层倾角下近断层沉积盆地地表的地震动时程和峰值变化规律。计算结果表明:近断层沉积盆地对地震动幅值具有显著的放大作用,在盆地内部,地震动持时明显延长以及空间分布更为复杂,同时出现多次长周期速度脉冲。断层倾角变化对地震动有着显著影响,在30°~90°范围内,整体上看:随倾角增大,盆地内部峰值加速度和峰值速度逐渐减小,而位移峰值受倾角的影响相对要小。另外,随近断层沉积盆地内部介质波速降低,盆地内部地表的地震加速度和速度会明显增大。
Abstract:
The characteristics of near-fault strong ground motions and far-field ground motions are different. At present, the far-field seismic response of the alluvial basin has been studied thoroughly, but the near-fault seismic response of the alluvial basin needs to be studied in detail. Using the spectral element method,the paper studied temporal variations of ground motions and peak ground motions on the surface of near-fault alluvial basin with different medium ratios and fault dips. It shows that ground motions in the near-fault alluvial basin are significantly amplified. Within the alluvial basins, the response space feature becomes more complicated with longer duaration and more long-period velocity pulses. The fault dip angle has a significant influence on the peak ground motions. In general, with the increase in the inclination angle from 30 degree to 90 degree, the peak acceleration and peak velocity decrease gradually, but the effect of the inclination angle on the peak displacement seems not so significant. Moreover, as the medium stiffness in the alluvial basin decreases, the seismic acceleration and velocity in the basin increase greatly.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-09-22;改回日期:2016-12-13。
基金项目:国家自然基金资助项目(51678390);天津市自然基金重点项目(15JCZDJC39900)
作者简介:刘中宪(1982-),男,教授,博士后,研究生导师,主要从事工程波动、地震工程领域的研究.E-mail:zhongxian1212@163.com
更新日期/Last Update: 1900-01-01