地震研究

收集273条地震动信息并进行滤波处理,综合考虑地震动断层距、PGA、PGV/PGA及平均周期等地震动基本参数指标,对比其反应谱、傅里叶谱以及能量谱,归纳了近场脉冲、远场类谐和这2类特殊长周期地震动与近、远场普通地震动的界定标准; 通过引入能量持时占比及地震动长周期分量能量占比等频谱参数,用于复核长周期地震动界定结果。结果表明:长周期地震动的反应谱衰减速率慢,在长周期段的谱值大于普通地震动; 长周期地震动具有能量大且集中于低频区域的特点。

In order to provide parameter bases for the selection of long-period ground motions for anti-seismic analysis,273 pieces of ground motions information is collected and filtered,which considered the basic parameters such as fault distance,PGA,PGV/PGA and average period of the ground motion.The response spectrum,Fourier spectrum and energy spectrum are compared to summarize the definition criteria of two kinds of special long-period ground motions and near-field and far-field ordinary ground motions; spectral parameters such as the energy duration ratio and the energy ratio of long-period components of ground motions are introduced to review the long-period ground motion definition results.The results show that the attenuation rate of response spectrum of long-period ground motion is slow,and the spectrum value of long-period ground is larger than that of the ordinary ground motion.Long-period ground motion has the characteristics that the seismic energy is large and concentrated in low frequency region.

引言
1 地震动数据库
2 地震动分解与参数分析
3 地震动反应谱特性对比
4 地震动频谱特性对比
5 结论

图1 震级与断层距的分布<br/>Fig.1 Distribution of magnitude and fault distance

图1 震级与断层距的分布
Fig.1 Distribution of magnitude and fault distance

图2 PGV/PGA与Tr关系(a)以及断层距与PGA关系(b)<br/>Fig.2 Relationship between PGV/PGA and Tr(a)and fault distance and PGA(b)

图2 PGV/PGA与Tr关系(a)以及断层距与PGA关系(b)
Fig.2 Relationship between PGV/PGA and Tr(a)and fault distance and PGA(b)

表1 地震动基本参数<br/>Tab.1 Basic parameters of ground motion

表1 地震动基本参数
Tab.1 Basic parameters of ground motion

图3 选取的4条地震动能量积累占比<br/>Fig.3 Energy accumulation ratio of the four selected ground motion

图3 选取的4条地震动能量积累占比
Fig.3 Energy accumulation ratio of the four selected ground motion

表2 地震动参数均值<br/>Tab.2 The average ground motion parameters

表2 地震动参数均值
Tab.2 The average ground motion parameters

图4 加速度(a)、速度(b)和位移(c)反应谱曲线对比<br/>Fig.4 Comparison of response spectra curves of acceleration(a),velocity(b),and displacement(c)

图4 加速度(a)、速度(b)和位移(c)反应谱曲线对比
Fig.4 Comparison of response spectra curves of acceleration(a),velocity(b),and displacement(c)

图5 选取的4条地震动加速度时程曲线对比<br/>Fig.5 Comparison of the four selected acceleration time history curve

图5 选取的4条地震动加速度时程曲线对比
Fig.5 Comparison of the four selected acceleration time history curve

图6 选取的4条地震动速度时程曲线对比<br/>Fig.6 Comparison of the four selected velocity time history curve

图6 选取的4条地震动速度时程曲线对比
Fig.6 Comparison of the four selected velocity time history curve

图7 选取的4条地震动傅里叶谱对比<br/>Fig.7 Comparison the four selected of Fourier spectrum

图7 选取的4条地震动傅里叶谱对比
Fig.7 Comparison the four selected of Fourier spectrum

图8 选取的4条地震动能量谱对比<br/>Fig.8 Comparison of the four selected energy spectrum

图8 选取的4条地震动能量谱对比
Fig.8 Comparison of the four selected energy spectrum

杜东升,王曙光,刘伟庆,等.2014.长周期地震动影响因素及频谱参数研究[J].建筑结构学报,35(增刊1):1-8.
韩淼,段燕玲,孙欢,等.2013.近断层地震动特征参数对基础隔震结构地震响应的影响分析[J].土木工程学报,46(6):8-13.
江义,杨迪雄,李刚.2010.近断层地震动向前方向性效应和滑冲效应对高层钢结构地震反应的影响[J].建筑结构学报,31(9):103-110.
李爽,谢礼立.2007.近场问题的研究现状与发展方向[J].地震学报,29(1):102-111.
李新乐.2004.近断层区桥梁结构的设计地震与抗震性能研究[D].成都:西南交通大学.
李雪红,王文科,吴迪,等.2014.长周期地震动的特性分析及界定方法研究[J].振动工程学报,27(5):685-692.
李英民,赵晨晓,谭潜.2018.基于HHT地震动分量分离的长周期地震动界定方法[J].振动与冲击,37(7):164-171.
刘启方,袁一凡,金星.2006.近断层地震动的基本特征[J].地震工程与工程振动,26(1):1-10.
卢啸,陆新征,叶列平.2012.超高层建筑地震动强度指标探讨[J].土木工程学报,45(增刊1):292-296.
王博,刘伯权,吴涛,等.2018.远场长周期地震动频谱特征周期与强度指标研究[J].振动与冲击,37(7):211-219.
王海云,谢礼立.2006.近断层强地震动的特点[J].哈尔滨工业大学学报,38(12):2070-2072.
徐龙军,胡进军,谢礼立.2008.特殊长周期地震动的参数特征研究[J].地震工程与工程振动,28(6):20-27.
徐龙军,赵国臣,谢礼立.2013.基于分量分离方法的地震动反应谱[J].天津大学学报,46(11):31-40.
许智星,孙颖,谷音,等.2013.长周期地震动参数及频谱特征[J].福州大学学报(自然科学版),41(4):760-764.
杨迪雄,李刚,程耿东.2005.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,25(2):119-124.
叶列平,马千里,缪志伟.2009.结构抗震分析用地震动强度指标的研究[J].地震工程与工程振动,29(4):9-22.
周靖,方小丹,江毅.2015.远场长周期地震动反应谱拐点特征周期研究[J].建筑结构学报,36(6):1-12.
Aki K.1968.Seismic displacements near a fault[J].Journal of Geophysical Research,73(16):5359-5376.
Akkar S,Bilge KüçükdoAgˇan.2010.Direct use of PGV for estimating peak nonlinear oscillator displacements[J].Earthquake Engineering & Structural Dynamics,37(12):1411-1433.
Baker J W.2007.Quantitative Classification of Near-Fault Ground Motions Using Wavelet Analysis[J].Bulletin of the Seismological Society of America,97(5):1486-1501.
Bray J D,Rodriguez M A.2004.Characterization of forward-directivity ground motions in the near-fault region[J].Soil Dynamics & Earthquake Engineering,24(11):815-828.
Fajfar P,Vidic T,Fischinger M.1990.A measure of earthquake motion capacity to damage medium-period structures[J].Soil Dynamics & Earthquake Engineering,9(5):236-242.
Ghahari S F,Jahankhah H,Ghannad M A.2010.Study on elastic response of structures to near-fault ground motions through record decomposition[J].Soil Dynamics & Earthquake Engineering,30(7):536-546.
Mavroeidis G P.2003.A Mathematical Representation of Near-Fault Ground Motions[J].Bulletin of the Seismological Society of America,93(3):1099-1131.
Rathje E M,Abrahamson N A,Bray J D.1998.Simplified Frequency Content Estimates of Earthquake Ground Motions[J].Journal of Geotechnical & Geoenvironmental Engineering,124(2):150-159.
Somerville P G.1997.Modification of empirical strong ground motion attenuation relations to include the amplitude and duration effects of rupture directivity[J].Seism Res Lett,68(1):199-222.
Trifunac M D,Brady A G.1975.A study on the duration of strong earthquake ground motion[J].Bulletin of the Seismological Society of America,65(3):581-626.
GB 50011—2010,建筑抗震设计规范[S].

备注

引言

1 地震动数据库

2 地震动分解与参数分析

3 地震动反应谱特性对比

4 地震动频谱特性对比

5 结论

期刊信息