用双向反应谱比法估计地形对结构反应的影响
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摘要
基于汶川地震发生时自贡市西山公园地形影响台阵的加速度记录,利用双向反应谱比法分析了山脊地形对单自由度体系结构反应的放大效应,结果表明:(1)水平向结构反应在结构自振频率小于1Hz的低频段放大效应不明显;在1～10Hz频段山顶放大效应最大,最大值达3.25,对应频率为6.25Hz;在10～20Hz频段,各台站放大效应趋于平稳,靠近山顶的7号台站放大效应最明显,最大值为2.3,对应频率为16.7Hz。(2)结构反应的最大放大系数有随高度的增加而增大的趋势,且在1～10Hz频段这种趋势比较明显。(3)与其它场地效应估计方法相比较,该方法能够体现地形效应对结构反应的影响,从而更有利于研究建筑结构震害的分布。
Based on the strong ground motion accelerations recorded by the topographic array in Xishan park of Zigong city for the mainshock of the Wenchuan earthquake,the amplification effects of SDOF system(damping ratio ζ=5%)located at the mountain ridge topography were studied with the bidirectional response spectra ratio method,and the results are as follows:(1)The amplification effect of topography on horizontal structure is not obvious when frequency is below 1Hz.In the frequency range from 1Hz to 10Hz,the amplification factor of hilltop is maximal,the maximal amplification factor is 3.25 and the corresponding frequency is 6.25Hz.In the frequency range from 10Hz to 20Hz,amplification effect of each station tends to be steady,the amplification factor of Station No.7 in the vicinity of hilltop is maximal,the maximal amplification factor is 2.3 and the corresponding frequency is 16.7Hz.(2)The maximal amplification factors of structure response tend to increase with the elevation of the hills,and the trend in frequency range from 1Hz to 10Hz is more obvious.(3)Compared with other site-response estimation techniques,this method could reflect the influence of topography on structure,which is a better way to study the seismic damage distribution of structures.
Based on the strong ground motion accelerations recorded by the topographic array in Xishan park of Zigong city for the mainshock of the Wenchuan earthquake,the amplification effects of SDOF system(damping ratio ζ=5%)located at the mountain ridge topography were studied with the bidirectional response spectra ratio method,and the results are as follows:(1)The amplification effect of topography on horizontal structure is not obvious when frequency is below 1Hz.In the frequency range from 1Hz to 10Hz,the amplification factor of hilltop is maximal,the maximal amplification factor is 3.25 and the corresponding frequency is 6.25Hz.In the frequency range from 10Hz to 20Hz,amplification effect of each station tends to be steady,the amplification factor of Station No.7 in the vicinity of hilltop is maximal,the maximal amplification factor is 2.3 and the corresponding frequency is 16.7Hz.(2)The maximal amplification factors of structure response tend to increase with the elevation of the hills,and the trend in frequency range from 1Hz to 10Hz is more obvious.(3)Compared with other site-response estimation techniques,this method could reflect the influence of topography on structure,which is a better way to study the seismic damage distribution of structures.
引文
江汶乡,2010,近场强震动加速度记录的校正处理方法,硕士学位论文,中国地震局工程力学研究所。
李吉涛、杨庆山,2010,地震波基线漂移的处理方法,北京交通大学学报,34(1),95～99。
韩建平、周伟,2010,基于汶川地震记录的地震动强度指标与SDOF体系响应的相关性,土木工程学报,43(增刊1),10～15。
欧阳行艳、章文波,2008,利用强震记录进行场地反应分析研究综述,世界地震工程,24(3),118～126。
欧阳行艳、章文波、张有兵,2009,利用集集地震余震记录分析场地地震动反应,中国科学院研究生院学报,26(3),373～382。
唐晖、李小军、李亚琦,2012,自贡西山公园山脊地形场地效应分析,振动与冲击,31(8),74～79。
王秀英、聂高众、王登伟,2010,汶川地震诱发滑坡与地震动峰值加速度对应关系研究,岩石力学与工程学报,29(1),82～89。
王海云、谢礼立,2010,自贡市西山公园地形对地震动的影响,地球物理学报,53(7),1631～1638。
杨宇、李小军、贺秋梅,2010,自贡西山公园山脊场地地形和土层效应数值模拟,震灾防御技术,6(4),436～447。
章文波、谢礼立、郭明珠,2001a,利用强震记录分析场地的地震反应,地震学报,23(6),604～614。
章文波、周雍年、谢礼立,2001b,场地放大效应的估计,地震工程与工程振动,21(4):1～9。
朱东生、虞庐松、陈兴冲,2005,地震动强度对场地地震反应的影响,世界地震工程,21(2),115～119。
Amiri G G,Dana F M,2005,Introduction of the most suitable parameter for selection of critical earthquake,Computers andStructures,83,613～626.
Borcherdt R D,1970,Effects of local geology on ground motion near San Francisco Bay,Bull Seism Soc Am,60(1),29～61.
Campbell K W,Bozorgnia Y,2010,A ground motion prediction equation for the horizontal component of cumulative absolutevelocity(CAV)based on the PEER-HGA strong motion database,Earthquake Spectra,26(3),635～650.
Choung-Yeol Seo,2005,Influence of ground motion characteristics and structural parameters on seismic responses of SDOF systems[doctor dissertation],Graduate and Research Committee in Candidacy.
Electric Power Research Institute,1988,Acriterion for determining exceedance of the operating basis earthquake,ERPI ReportNP-5930,1～28.
Field E H,Jacob K H,1995,A comparison and test of various site-response estimation techniques,including three that are notreference-site dependent,Bull Seism Soc Am,85(1),1127～1143.
Parolai S,Richwalski S M,Milkereit C,et al,2004,Assessment of the stability of H/V spectral ratios from ambient noise andcomparison with earthquake data in the Cologne area(Germany),Tectonophysics,390,57～73.
李吉涛、杨庆山,2010,地震波基线漂移的处理方法,北京交通大学学报,34(1),95～99。
韩建平、周伟,2010,基于汶川地震记录的地震动强度指标与SDOF体系响应的相关性,土木工程学报,43(增刊1),10～15。
欧阳行艳、章文波,2008,利用强震记录进行场地反应分析研究综述,世界地震工程,24(3),118～126。
欧阳行艳、章文波、张有兵,2009,利用集集地震余震记录分析场地地震动反应,中国科学院研究生院学报,26(3),373～382。
唐晖、李小军、李亚琦,2012,自贡西山公园山脊地形场地效应分析,振动与冲击,31(8),74～79。
王秀英、聂高众、王登伟,2010,汶川地震诱发滑坡与地震动峰值加速度对应关系研究,岩石力学与工程学报,29(1),82～89。
王海云、谢礼立,2010,自贡市西山公园地形对地震动的影响,地球物理学报,53(7),1631～1638。
杨宇、李小军、贺秋梅,2010,自贡西山公园山脊场地地形和土层效应数值模拟,震灾防御技术,6(4),436～447。
章文波、谢礼立、郭明珠,2001a,利用强震记录分析场地的地震反应,地震学报,23(6),604～614。
章文波、周雍年、谢礼立,2001b,场地放大效应的估计,地震工程与工程振动,21(4):1～9。
朱东生、虞庐松、陈兴冲,2005,地震动强度对场地地震反应的影响,世界地震工程,21(2),115～119。
Amiri G G,Dana F M,2005,Introduction of the most suitable parameter for selection of critical earthquake,Computers andStructures,83,613～626.
Borcherdt R D,1970,Effects of local geology on ground motion near San Francisco Bay,Bull Seism Soc Am,60(1),29～61.
Campbell K W,Bozorgnia Y,2010,A ground motion prediction equation for the horizontal component of cumulative absolutevelocity(CAV)based on the PEER-HGA strong motion database,Earthquake Spectra,26(3),635～650.
Choung-Yeol Seo,2005,Influence of ground motion characteristics and structural parameters on seismic responses of SDOF systems[doctor dissertation],Graduate and Research Committee in Candidacy.
Electric Power Research Institute,1988,Acriterion for determining exceedance of the operating basis earthquake,ERPI ReportNP-5930,1～28.
Field E H,Jacob K H,1995,A comparison and test of various site-response estimation techniques,including three that are notreference-site dependent,Bull Seism Soc Am,85(1),1127～1143.
Parolai S,Richwalski S M,Milkereit C,et al,2004,Assessment of the stability of H/V spectral ratios from ambient noise andcomparison with earthquake data in the Cologne area(Germany),Tectonophysics,390,57～73.
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