近断层区域划分及近断层速度脉冲型地震动模拟
发布时间：2018-07-14 22:18
【摘要】：近断层(near-fault)地震动是指发震断层附近的地震地面运动。这种地震动因其与远场地震有着不同的特性且对长周期结构有强烈的破坏作用而引起地震工程学领域的广泛关注。论文主要针对近场区域影响范围和近断层速度脉冲型地震动模拟进行研究,从而确定模拟速度脉冲的参数输入和人工合成近断层速度脉冲型地震动方法。根据以上研究内容,论文做了如下工作：(1)查阅文献总结近断层地震研究现状并搜集了断层距90kmm内的1296条(水平977条,竖向319条)地震记录,对地震动进行了分析。(2)选取并计算了19个地震潜在破坏势参数,采用Pearson相关系数计算方法计算了潜在破坏势参数间的相关系数。(3)按断层类型、场地类别和震级范围把记录分成20组(水平11组,竖向9组),确定每一组近断层区域划分参数组合,通过分段函数拟合得到每一组地震的临界断层距,进而确定了不同断层类型、场地类别及震级下近断层区域范围。(4)基于小波分析识别出了速度脉冲型地震,并提取了速度脉冲型地震中的脉冲成分,统计了脉冲的分布特性,经统计回归得到脉冲周期Tp、脉冲峰值速度PGV和脉冲峰值对应时刻t的经验公式。(5)分析了基于小波分析方法计算的脉冲周期Tp与基于速度反应谱法计算的脉冲周期Tsv之比Tp/Tsv的变化范围和影响因素。(6)通过对脉冲成分与非脉冲成分的功率谱对比分析得到高、低频分界频率fr的计算方法,并确定了fr与脉冲周期Tp的定量关系。(7)对Tian脉冲模型进行改进,以速度脉冲型地震参数统计结果为参数输入生成低频脉冲成分,与经反应谱拟合得到的高频成分叠加生成近断层速度脉冲型地震动。
[Abstract]:Near-fault (near-fault) ground motion refers to the ground motion near the seismogenic fault. This kind of ground motion has attracted wide attention in the field of seismic engineering because it has different characteristics from far-field earthquakes and has a strong destructive effect on long-period structures. In this paper, the influence range of near-field region and the simulation of near-fault velocity pulse type ground motion are studied, so as to determine the parameter input of simulation velocity pulse and the synthetic method of near-fault velocity pulse type ground motion. According to the above research contents, this paper has done the following work: (1) reviewing the literature to summarize the present situation of recent fault seismic research and collecting 1296 seismic records of fault distance from 90kmm (horizontal 977, vertical 319). The earthquake motion is analyzed. (2) 19 parameters of potential failure potential are selected and calculated. Pearson correlation coefficient method is used to calculate the correlation coefficient between the parameters of potential failure potential. (3) according to fault type, The site category and magnitude range divide the records into 20 groups (11 horizontal groups, 9 vertical groups), determine the parameter combination of each group near fault area, and obtain the critical fault distance of each group of earthquakes by piecewise function fitting. Furthermore, different fault types, site types and the range of near-fault area under magnitude are determined. (4) based on wavelet analysis, velocity pulse earthquakes are identified, and pulse components in velocity pulse earthquakes are extracted, and the distribution characteristics of pulses are analyzed. The empirical formulas of pulse period T p, pulse peak velocity PGV and pulse peak corresponding time t are obtained by statistical regression. (5) the pulse period T p calculated based on wavelet analysis method and the pulse period calculated based on velocity response spectrum method are analyzed. The ratio of Tsv to Tsv and its influencing factors. (6) by comparing the power spectrum of pulse component with that of non-pulse component, we find that the ratio of Tsv to Tsv is very high. The calculation method of low frequency boundary frequency f _ r and the quantitative relation between f _ r and pulse period T _ p are determined. (7) the Tian pulse model is improved and the low-frequency pulse component is generated by using the statistical results of velocity pulse seismic parameters as parameters. Superposed with the high frequency component obtained by the response spectrum, the near fault velocity pulse ground motion is formed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9
本文编号：2123135
[Abstract]:Near-fault (near-fault) ground motion refers to the ground motion near the seismogenic fault. This kind of ground motion has attracted wide attention in the field of seismic engineering because it has different characteristics from far-field earthquakes and has a strong destructive effect on long-period structures. In this paper, the influence range of near-field region and the simulation of near-fault velocity pulse type ground motion are studied, so as to determine the parameter input of simulation velocity pulse and the synthetic method of near-fault velocity pulse type ground motion. According to the above research contents, this paper has done the following work: (1) reviewing the literature to summarize the present situation of recent fault seismic research and collecting 1296 seismic records of fault distance from 90kmm (horizontal 977, vertical 319). The earthquake motion is analyzed. (2) 19 parameters of potential failure potential are selected and calculated. Pearson correlation coefficient method is used to calculate the correlation coefficient between the parameters of potential failure potential. (3) according to fault type, The site category and magnitude range divide the records into 20 groups (11 horizontal groups, 9 vertical groups), determine the parameter combination of each group near fault area, and obtain the critical fault distance of each group of earthquakes by piecewise function fitting. Furthermore, different fault types, site types and the range of near-fault area under magnitude are determined. (4) based on wavelet analysis, velocity pulse earthquakes are identified, and pulse components in velocity pulse earthquakes are extracted, and the distribution characteristics of pulses are analyzed. The empirical formulas of pulse period T p, pulse peak velocity PGV and pulse peak corresponding time t are obtained by statistical regression. (5) the pulse period T p calculated based on wavelet analysis method and the pulse period calculated based on velocity response spectrum method are analyzed. The ratio of Tsv to Tsv and its influencing factors. (6) by comparing the power spectrum of pulse component with that of non-pulse component, we find that the ratio of Tsv to Tsv is very high. The calculation method of low frequency boundary frequency f _ r and the quantitative relation between f _ r and pulse period T _ p are determined. (7) the Tian pulse model is improved and the low-frequency pulse component is generated by using the statistical results of velocity pulse seismic parameters as parameters. Superposed with the high frequency component obtained by the response spectrum, the near fault velocity pulse ground motion is formed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9
【参考文献】
相关期刊论文 前7条
1 邬鑫,朱f^;近场地震的速度脉冲效应及简化冲击回归公式的检验[J];北方交通大学学报;2003年01期
2 李新乐;王瀑;窦慧娟;杜蓬娟;;近断层地震动峰值加速度特性研究[J];大连民族学院学报;2006年03期
3 温联星，，姚振兴;用广义射线和有限差分计算近场理论地震图的混合方法[J];地球物理学报;1994年02期
4 李新乐,朱f^;近断层地震动等效速度脉冲研究[J];地震学报;2004年06期
5 韦韬;赵凤新;张郁山;;近断层速度脉冲的地震动特性研究[J];地震学报;2006年06期
6 田玉基;杨庆山;卢明奇;;近断层脉冲型地震动的模拟方法[J];地震学报;2007年01期
7 李爽;谢礼立;郝敏;;上盘效应对工程结构位移反应影响分析[J];西安建筑科技大学学报(自然科学版);2006年06期
相关博士学位论文 前2条
1 王峥峥;跨断层隧道结构非线性地震损伤反应分析[D];西南交通大学;2009年
2 李明;近断层地震动对结构抗震设计的影响研究[D];中国地震局工程力学研究所;2010年
相关硕士学位论文 前1条
1 王长龙;近断层地震动作用下钢框架结构的地震响应分析[D];北京交通大学;2008年
本文编号：2123135
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2123135.html
