基于不同地震事件数据的竖向地震动特性统计分析
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摘要
选取9次不同地震事件的86组地震动加速度记录,对其地震动参数进行分析,重点选择地震动竖向与水平峰值加速度比、竖向与水平加速度反应谱及竖向与水平卓越周期比等进行统计研究。研究结果表明:竖向与水平峰值加速度比的平均值为0.78,且大约60%台站的峰值加速度比大于2/3;随着震中距的增大,竖向与水平峰值加速度比总体上呈减小趋势;竖向与水平加速度反应谱比曲线在周期0～6s内大致呈"Z"字形;竖向加速度反应谱和水平加速度反应谱的谱形有较大差异,且竖向反应谱达到最大值的周期值明显小于水平反应谱达到最大值的周期值;绝大多数台站竖向与水平卓越周期比小于1.0,且该比值随着震中距的增大呈增大趋势。在此基础上,建议抗震设计规范对竖向地震影响系数的取值及衰减指数、特征周期等做单独规定。
86 suites of acceleration records from the 9 earthquake events around the world were selected and processed for extracting some essential ground motion parameters. The ratios of vertical to horizontal peak ground acceleration,vertical and horizontal acceleration response spectra and predominant period were mainly investigated statistically. The results indicated that the average ratio of vertical to horizontal peak ground motion is 0. 78,and the ratios of more than60% stations are greater than the rule of thumb,2 /3. This ratio decreases with the increasing epicentral distance. The curves of vertical to horizontal acceleration response spectrum ratios with period from 0 to 6 second have "Z"shape generally. The shapes of vertical and horizontal acceleration response spectrum vary within the different period range.And the vertical acceleration response spectrum achieves the maximum value at the smaller period comparing to the horizontal acceleration response spectrum. For most of stations,the ratio of vertical to horizontal predominant period is less than 1. 0. And this ratio increases with the increasing epicentral distance. Finally, influence coefficients,attenuation index and characteristic period of vertical seismic effect for the seismic design code should be prescribed separately.
86 suites of acceleration records from the 9 earthquake events around the world were selected and processed for extracting some essential ground motion parameters. The ratios of vertical to horizontal peak ground acceleration,vertical and horizontal acceleration response spectra and predominant period were mainly investigated statistically. The results indicated that the average ratio of vertical to horizontal peak ground motion is 0. 78,and the ratios of more than60% stations are greater than the rule of thumb,2 /3. This ratio decreases with the increasing epicentral distance. The curves of vertical to horizontal acceleration response spectrum ratios with period from 0 to 6 second have "Z"shape generally. The shapes of vertical and horizontal acceleration response spectrum vary within the different period range.And the vertical acceleration response spectrum achieves the maximum value at the smaller period comparing to the horizontal acceleration response spectrum. For most of stations,the ratio of vertical to horizontal predominant period is less than 1. 0. And this ratio increases with the increasing epicentral distance. Finally, influence coefficients,attenuation index and characteristic period of vertical seismic effect for the seismic design code should be prescribed separately.
引文
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[7]韩建平,周伟.汶川地震竖向地震动特征初步分析[J].工程力学,2012,29(12):211-219(Han Jianping,Zhou Wei.Preliminary investigation on characteristics of vertical ground motion during Wenchuan earthquake[J].Engineering Mechanics,2012,29(12):211-219(in Chinese))
[2]Bozorgnia Y,Campbell K,Niazi M.Observed spectral characteristics of vertical ground motion recorded during worldwide earthquakes from 1957 to 1995[C]//Proceedings of the 12WCEE.Auckland,New Zealand,2000
[3]周锡元,徐平,王国权,等.1999年台湾集集地震近断层竖向与水平反应谱比值的研究[J].地震地质,2006,28(3):325-335(Zhou Xiyuan,Xu Ping,Wang Guoquan,et al.A case study on near fault vertical to horizontal response spectral ratio from the 1999,Chi-Chi,Taiwan,earthquake[J].Seismology and Geology,2006,28(3):325-335(in Chinese))
[4]Kim S J,Holub C J,Elnashai A S.Analytical assessment of the effect of vertical earthquake motion on RC bridge piers[J].Journal of Structural Engineering,2011,137(2):252-260
[5]Kunnath S K,Erduran E,Chai Y H,et al.Effect of nearfault vertical ground motions on seismic response of highway overcrossings[J].Journal of Bridge Engineering,2008,13(3):282-290
[6]Yilmaz Z.Probabilistic seismic hazard assessment for the effect of vertical ground motions on seismic response of highway bridges[D].Davis:University of California,2008
[7]韩建平,周伟.汶川地震竖向地震动特征初步分析[J].工程力学,2012,29(12):211-219(Han Jianping,Zhou Wei.Preliminary investigation on characteristics of vertical ground motion during Wenchuan earthquake[J].Engineering Mechanics,2012,29(12):211-219(in Chinese))
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