基于场地效应的地震动特性研究
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摘要
为了研究强地震作用下,场地类别对于地震动幅频特性的影响,本文统计了3 579条日本地震动的时程,并针对场地类别的不同,分别从基岩和土层的峰值加速度幅值特性角度,以及从标准化反应谱和平均加速度反应谱等频谱特性的角度研究其幅频衰减特性,最后给出了各类场地峰值加速度衰减曲线。结果表明,土层对于地震动幅值和频谱的放大作用会随着场地类别的变软而增加,并且场地越软,远场的长周期特性越明显。利用平均加速度反应谱可以有效地反映频谱中的长周期成分。
3579 earthquake ground motions were considered to find out the influence of site condition on amplitude frequency characteristic of seismic ground motion.The peak ground acceleration amplitude characteristic for bedrock and soil,and frequency characteristics,such as standard response spectrum and average acceleration response spectrum are studied.Besides,an empirical attenuation relation is obtained for variance of earthquake parameters in different site categories.The effect of soil amplification on seismic amplitude and frequency is more strong in soft soil than in hard soil.In soft soil,there is an obvious long-period effect,which can be identified by average acceleration response spectrum.
3579 earthquake ground motions were considered to find out the influence of site condition on amplitude frequency characteristic of seismic ground motion.The peak ground acceleration amplitude characteristic for bedrock and soil,and frequency characteristics,such as standard response spectrum and average acceleration response spectrum are studied.Besides,an empirical attenuation relation is obtained for variance of earthquake parameters in different site categories.The effect of soil amplification on seismic amplitude and frequency is more strong in soft soil than in hard soil.In soft soil,there is an obvious long-period effect,which can be identified by average acceleration response spectrum.
引文
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[10]唐俊华.长周期地震动特性研究极其对隔震结构的影响分析[D].南京:南京工业大学,2011.TANG Junhua.Analysis of long period ground motion and its impact on the isolated structure[D].Nanjing:Nanjing University of Technology,2011.(in Chinese)
[11]Abrahamson N A,Silva W J,Empirical response spectral attenuation relations for shallow crustal earthquakes[J],Seismological Res.Lett.,1997,68(1):94-127.
[12]胡聿贤,霍俊荣.具有随机误差变量之间的回归关系[J].地震工程与工程振动,1988,8(4):1-12.HU Yuxian,HUO Junrong.The Regression relationship between variables with Random error[J].Journal of Earthquake Engineering and Engi-neering Vibration,1988,8(4):1-12.(in Chinese)
[13]霍俊荣,胡聿贤.地震动峰值参数衰减规律的研究[J].地震工程与工程振动,1992,12(2):1-11.HUO Junrong,HU Yuxian.Study on attenuation laws of ground motion parameters[J].Journal of Earthquake Engineering and Engineering Vibra-tion,1992,12(2):1-11.(in Chinese)
[14]王国新,陶夏新.地震动衰减关系拟合的新两步法[J].地震工程和工程振动,2001,20(1):24-29.WANG Guoxin,TAO Xiaxin.A new two-steps method for fitting ground motion attenuation relationship[J].Journal of Earthquake Engineeringand Engineering Vibration,2001,20(1):24-29.(in Chinese)
[2]周锡元,齐微.震级、震中距和场地条件对反应谱特性影响的统计分析[J].北京工业大学学报,2006,32(2):97-103.ZHOU Xiyuan,QI Wei.Statistical analysis on the influence of magnitude,distance and site condition on response spectra[J].Journal of BeijingUniversity of Technology,2006,32(2):97-103.(in Chinese)
[3]李小军,阎秀杰,潘华.中小震近场地震动估计中地震动衰减关系的适用性分析[J].地震工程与工程振动,2005,25(1):29-36.LI Xiaojun,YAN Xiujie,PAN Hua.Suitability analysis of ground motion attenuation relation in estimation of near-field ground motion for small andmoderate earthquakes[J].Jounral of Earthquake Engineering and Engineering Vibration,2005,25(1):29-36.(in Chinese)
[4]王伟.近断层地震动的频谱特性和能量谱分析[D].大连:大连理工大学,2010.WANG Wei.Analysis on frequency content characteristic and energy spectrum of near-fault ground motions[D].Dalian:Dalian University of Tech-nology,2010.(in Chinese)
[5]李保昆,陈培善,白彤霞.强地面运动衰减的经验关系综述[J].国际地震动态,1996(7):1-7.LI Baokun,CHEN Peishan,BAI Tongxia.Overview of the empirical relationship of strong ground motion attenuation[J].Recent Ddevelements inWorld Seismology,1996,(7):1-7.(in Chinese)
[6]战吉燕,陈国兴,刘建达.深软场地大地震远场地震动反应特性分析[J].岩土力学,2011,1:508-514.ZHAN Jiyan,CHEN Guoxing,LIU Jianda.Seismic response characteristics analysis of deep soft site under far-field ground motion of great earth-quake[J].Rock and Soil Mechanics,2011,1:508-514.(in Chinese)
[7]Rathje Ellen M.Empirical relationships for frequency content parameters of earthquake ground motions[J].Earthquake Spectrum,2004,20(1):119-144.
[8]Shin AOI,Takashi Kunugi.Strong-motion seismograph network operated by nied:k-NET and KiK-net[J].Journal of Japan Association for Earth-quake Engineering,2004,4(3):65-74.
[9]苏经宇,谭健.考虑土质特征及区域性的地震动峰值衰减规律[J].工程抗震,1987,4:44-48.SU Jingyu,TAN Jian.The attenuation laws of ground motion considering soil characteristics and regional[J].Earthquake Resistant,1987,4:44-48.(in Chinese)
[10]唐俊华.长周期地震动特性研究极其对隔震结构的影响分析[D].南京:南京工业大学,2011.TANG Junhua.Analysis of long period ground motion and its impact on the isolated structure[D].Nanjing:Nanjing University of Technology,2011.(in Chinese)
[11]Abrahamson N A,Silva W J,Empirical response spectral attenuation relations for shallow crustal earthquakes[J],Seismological Res.Lett.,1997,68(1):94-127.
[12]胡聿贤,霍俊荣.具有随机误差变量之间的回归关系[J].地震工程与工程振动,1988,8(4):1-12.HU Yuxian,HUO Junrong.The Regression relationship between variables with Random error[J].Journal of Earthquake Engineering and Engi-neering Vibration,1988,8(4):1-12.(in Chinese)
[13]霍俊荣,胡聿贤.地震动峰值参数衰减规律的研究[J].地震工程与工程振动,1992,12(2):1-11.HUO Junrong,HU Yuxian.Study on attenuation laws of ground motion parameters[J].Journal of Earthquake Engineering and Engineering Vibra-tion,1992,12(2):1-11.(in Chinese)
[14]王国新,陶夏新.地震动衰减关系拟合的新两步法[J].地震工程和工程振动,2001,20(1):24-29.WANG Guoxin,TAO Xiaxin.A new two-steps method for fitting ground motion attenuation relationship[J].Journal of Earthquake Engineeringand Engineering Vibration,2001,20(1):24-29.(in Chinese)
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