土体阻尼形式对地表加速度反应谱的影响
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- 英文论文题名：Effect of damping models on response spectra of ground motions
- 论文作者：孙强强 ; 薄景山 ; 郭晓云 ; 景立平
- 英文论文作者：Sun Qiangqiang ; Bo Jingshan ; Guo Xiaoyun ; Jing Liping ; Institute of Disaster Prevention ; Institute of Engineering Mechanics ; China Earthquake Administration
- 年：2016
- 作者机构：防灾科技学院;中国地震局工程力学研究所;
- 论文关键词：阻尼形式 ; 反应谱 ; 有限差分法 ; 土层地震反应
- 英文论文关键词：Damping models ; response spectra ; finite difference method ; site response
- 会议召开时间：2016-10-27
- 会议录名称：第九届全国防震减灾工程学术研讨会论文集
- 语种：中文
- 分类号：TU435
- 学会代码：OGTY
- 会议名称：第九届全国防震减灾工程学术研讨会
- 会议地点：中国安徽合肥
- 主办单位：中国土木工程学会、中国工程院土木、水利与建筑工程学部、中国土木工程学会防震减灾工程技术推广委员会、合肥工业大学、安徽省住房和城乡建设厅
- 学会名称：中国土木工程学会
- 页数：8
- 文件大小：349k
- 原文格式：O
- 会议级别：全国
摘要
采用有限差分方法构建一组数值计算模型进行了土层地震反应分析,研究了不同土体阻尼形式对地表加速度反应谱和谱参数的影响。结果表明:阻尼形式对加速度反应谱高频段影响显著,对低频段影响有限;而随着土体卓越频率的减小,影响范围向长周期方向发展,反应谱的相对误差也逐渐增大;当土体卓越频率远低于输入地震动峰值频率时,加速度反应谱谱值最大相对偏差可达9倍;阻尼形式对反应谱特征周期、衰减指数影响较小,而对平台值影响较大;只考虑土体卓越频率的阻尼形式会低估土层的地震反应。
A series of numerical models were developed to simulate the site response and to investigate the effect of damping models on response spectra in time—domain based on Finite difference methodC FDM).A full Rayleigh damping was adopted and the low frequency was selected as the fundamental site frequency,the high frequency(optimal frequency) was determined by five methods.Analyzes revealed that damping models have significant impact on the high frequency band of the acceleration response spectra,but influence limited on the low frequency.With the decrease of the fundamental site frequency,the influence ranged to the long period and the relative error of response spectra was gradually increasing.When the fundamental site frequency was much lower than the predominant frequency of input motions,the maximum relative deviation of the acceleration response spectra was up to 9 times in different damping models.The damping models had little influence on the characteristic period of response spectra and attenuation index,but had great influence on the platform value.The seismic response of the site could be underestimated only by considering the fundamental site frequency.
A series of numerical models were developed to simulate the site response and to investigate the effect of damping models on response spectra in time—domain based on Finite difference methodC FDM).A full Rayleigh damping was adopted and the low frequency was selected as the fundamental site frequency,the high frequency(optimal frequency) was determined by five methods.Analyzes revealed that damping models have significant impact on the high frequency band of the acceleration response spectra,but influence limited on the low frequency.With the decrease of the fundamental site frequency,the influence ranged to the long period and the relative error of response spectra was gradually increasing.When the fundamental site frequency was much lower than the predominant frequency of input motions,the maximum relative deviation of the acceleration response spectra was up to 9 times in different damping models.The damping models had little influence on the characteristic period of response spectra and attenuation index,but had great influence on the platform value.The seismic response of the site could be underestimated only by considering the fundamental site frequency.
引文
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[3]Kwok A O L,Jonathan P S,Hashash Y M A,et al.Use of exact solutions of wave pro-pagation problems to guide implementation of nonlinear seismic ground response analysisprocedures[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(11):1385-1398.
[4]丁海平,马俊玲.基于土层特征周期的瑞利阻尼确定方法[J].岩土力学,2013,34(s2):35-40(Ding Haiping,Ma Junling.A method for Rayleigh damping based on site characteristic period[J].Rock and Soil Mechanics,2013,34(s2):35-40(in Chinese))
[5]Tsai C C,Park D,Chen C W.Selection of the optimal frequencies of viscous damping formulation in nonlinear time-domain site response analysis[J].Soil Dynamics and Earthquake Engineering,2014,(67):353-358.
[6]李小军,侯春林,潘蓉,等.阻尼形式选取对核电厂结构地震响应的影响分析[J].振动与冲击,2015,34(1):110-116(Li Xiaojun,Hou Chunlin,Pan Rong.et al.Effect of damping matrix selection on seismic response of nuclear power plant structures[J].Journal of Vibration and Shock,2015,34(1):110-116(in Chinese))
[7]胡聿贤.地震工程学[M].北京:地震出版社,1995.
[8]Itasca.2005.Software Manual of FLAC Version 5.0.Itasca Consulting Group.
[9]Lysmer J,Kuhlemeyer R L.Finite dynamic model for infinite media[J].Journal of Engineering Division,ASCE,1969,(95):859-77.
[10]Idriss I M,Lysmer J,Hwang R.QUAD4:a computer program for evaluating the seismic response of soil structures by variable finite element procedures[R].Berkeley:University of California,1973.
[11]Hunson M,Idriss M,Beikae M.Usermanual for QUAD4m:A computer program to evaluate the seismic response of soil st-ructures using finite element procedures andincorporating a compliant base[D].Berkeley:University of California,1994.
[12]Park D,Hashash Y M A.Soil damping formulation in nonliear time domain site resp-onse analysis[J].Journal of Earthquake Engineering,2004,(8)s249-274.
[13]蒋其峰,彭艳菊,吕悦军.渤海海域软表层厚度对反应谱的影响[J].地震工程与工程振动,2014,34(s1):2 38-247(Jiang Qifeng,Peng Yanju,Lv Yuejun.The inluence of soft surface soil's thinkness on response spectra in Bohai sea[J]Earthquake Engineering and Engineering Dynamics,2014,34(sl):238-247(in Chinese))
[14]郭晓云,薄景山,巴文辉,等.最小二乘法分段拟合标定反应谱方法[J].世界地震工程,2012,28(3):29-34(Guo Xiaoyun,Bo Jingshan,Ba Wenhui,et al Sectional least square fitting method for calibrating seismic design response spectrum[J].World Earthquake Engineering,2012,28(3):29-34(in Chinese))