汶川地震垂直和平行断层方向地震动特征差异
|
摘要
为探讨断层走向对水平地震动的影响,选取汶川地震113组水平地面运动加速度记录,对比研究了垂直断层方向(FN)和平行断层方向(FP)分量的地震动加速度峰值、持时、反应谱、放大系数和特征周期等参数的差异.结果表明:断层距小于50 km时,FN分量地震动加速度峰值大于FP分量,且二者加速度峰值比的均值受场地条件影响较小;断层距越大,FN和FP分量地震动加速度持时越长;断层距小于100 km时,Ⅰ类场地FN和FP分量加速度持时的差别大于Ⅱ类场地;近断层区域内,FN与FP分量加速度反应谱比值的均值大于放大系数比值的均值,Ⅰ类场地FN和FP分量加速度反应谱、放大系数的差别均分别大于Ⅱ类场地;FN和FP分量地震动特征周期差别明显,且二者比值的均值和差值的均值都受场地条件影响较大.
Totally 113 groups of horizontal ground motion were selected from the Wenchuan earthquake to study the influence of fault strike on horizontal ground motion.Differences between fault-normal(FN) and fault-parallel(FP) components were researched by comparing the peak ground acceleration,duration,response spectra,amplification factor and characteristic period.The research results show that when fault distance is less than 50 km,peak ground acceleration of the FN component is larger than that of the FP component,and the mean ratio of their peak ground accelerations is slightly affected by site conditions;durations of the two components both increase with the fault distance.When the fault distance is less than 100 km,the difference of their durations under site class Ⅰ is larger than that under site class Ⅱ.In near-fault areas,the mean ratio of their response spectra is larger than that of their amplification factors,and the differences of their response spectra and amplification factors are more obvious under site class Ⅰ than under site class Ⅱ;characteristic periods of the two components show a sufficient difference,and site conditions have a large effect on the mean ratio and difference of their characteristic periods.
Totally 113 groups of horizontal ground motion were selected from the Wenchuan earthquake to study the influence of fault strike on horizontal ground motion.Differences between fault-normal(FN) and fault-parallel(FP) components were researched by comparing the peak ground acceleration,duration,response spectra,amplification factor and characteristic period.The research results show that when fault distance is less than 50 km,peak ground acceleration of the FN component is larger than that of the FP component,and the mean ratio of their peak ground accelerations is slightly affected by site conditions;durations of the two components both increase with the fault distance.When the fault distance is less than 100 km,the difference of their durations under site class Ⅰ is larger than that under site class Ⅱ.In near-fault areas,the mean ratio of their response spectra is larger than that of their amplification factors,and the differences of their response spectra and amplification factors are more obvious under site class Ⅰ than under site class Ⅱ;characteristic periods of the two components show a sufficient difference,and site conditions have a large effect on the mean ratio and difference of their characteristic periods.
引文
[1]陈运泰,许力生,张勇,等.2008年5月12日汶川特大地震震源特性分析报告[R/OL].(2008-05-26)[2010-06-08].http://www.csi.ac.cn/sichuan/chenyuntai.pdf.
[2]CHEN J,GAVIN H.Finite fault model-preliminaryresult of the May 12,2008 Mw 7.9 eastern Sichuan,China earthquake[R/OL].(2008-07-16)[2010-06-08].http://earthquake.usgs.gov/earthquakes/eqinthenews/2008/us2008ryan/finite_fault.php.
[3]叶列平,路新征,赵世春,等.框架结构抗地震倒塌能力的研究:汶川极震区几个框架结构震害案例分析[J].建筑结构学报,2009,30(6):67-78.YE Lieping,LU Xinzheng,ZHAO Shichun,et al.Seismic collapse resistance of RC frame structures:casestudies on seismic damages of several RC framestructures under extreme ground motion in Wenchuanearthquake[J].Journal of Building Structures,2009,30(6):67-78.
[4]SOMERVILLE P G,SMITH N F,GRAVES R W.Modification of empirical strong ground motionattenuation relations to include the amplitude andduration effects of rupture directivity[J].SeismologicalResearch Letters,1997,68(1):199-222.
[5]王国权.集集地震近断层地面运动特征[D].北京:中国地震局地质研究所,2001.
[6]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.Acase study on near fault vertical to horizontal responsespectral ratio from the 1999 Chi-Chi,Taiwanearthquake[J].Seismology and Geology,2006,28(3):325-335.
[7]胡进军.近断层地震动方向性及超剪切破裂研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[8]中华人民共和国建设部.GB 50011—2001建筑结构抗震规范[S].北京:中国建筑工业出版社,2008.
[9]WANG Dong,XIE Lili.Attenuation of peak groundaccelerations from the great Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009,8(2):179-188.
[10]TIWARI A K,GUPTA V K.Scaling of ductility anddamage-based strength reduction factors for horizontalmotions[J].Earthquake Engineering and StructuralDynamics,2000,29(7):969-987.
[11]BOMMER J J,HANCOCK J,ALARCON J E.Correlations between duration and number of effectivecycles of earthquake ground motion[J].Soil Dynamicsand Earthquake Engineering,2006,26(1):1-13.
[12]JUSTIN J K,JONATHAN P S.Prediction equationsfor significant duration of earthquake ground motionsconsidering site and near-source effects[J].Earth-quake Spectra,2006,22(4):985-1013.
[13]TRIFUNAC M D,BRADY A G.A study on theduration of strong earthquake ground motion[J].Bulletin of the Seismological Society of America,1975,65(3):581-626.
[14]伍平,于建华.结构抗震设计中地震动输入的若干问题[J].西南交通大学学报,2002,37(Sup.1):44-49.WU Ping,YU Jianhua.Review on seismic input inaseismic design[J].Journal of Southwest JiaotongUniversity,2002,37(Sup.1):44-49.
[15]HWANG J H,YANG C W.Verification of criticalcyclic strength curve by Taiwan Chi-Chi earthquakedata[J].Soil Dynamics and Earthquake Engineering,2001,21(3):237-257.
[2]CHEN J,GAVIN H.Finite fault model-preliminaryresult of the May 12,2008 Mw 7.9 eastern Sichuan,China earthquake[R/OL].(2008-07-16)[2010-06-08].http://earthquake.usgs.gov/earthquakes/eqinthenews/2008/us2008ryan/finite_fault.php.
[3]叶列平,路新征,赵世春,等.框架结构抗地震倒塌能力的研究:汶川极震区几个框架结构震害案例分析[J].建筑结构学报,2009,30(6):67-78.YE Lieping,LU Xinzheng,ZHAO Shichun,et al.Seismic collapse resistance of RC frame structures:casestudies on seismic damages of several RC framestructures under extreme ground motion in Wenchuanearthquake[J].Journal of Building Structures,2009,30(6):67-78.
[4]SOMERVILLE P G,SMITH N F,GRAVES R W.Modification of empirical strong ground motionattenuation relations to include the amplitude andduration effects of rupture directivity[J].SeismologicalResearch Letters,1997,68(1):199-222.
[5]王国权.集集地震近断层地面运动特征[D].北京:中国地震局地质研究所,2001.
[6]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.Acase study on near fault vertical to horizontal responsespectral ratio from the 1999 Chi-Chi,Taiwanearthquake[J].Seismology and Geology,2006,28(3):325-335.
[7]胡进军.近断层地震动方向性及超剪切破裂研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[8]中华人民共和国建设部.GB 50011—2001建筑结构抗震规范[S].北京:中国建筑工业出版社,2008.
[9]WANG Dong,XIE Lili.Attenuation of peak groundaccelerations from the great Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009,8(2):179-188.
[10]TIWARI A K,GUPTA V K.Scaling of ductility anddamage-based strength reduction factors for horizontalmotions[J].Earthquake Engineering and StructuralDynamics,2000,29(7):969-987.
[11]BOMMER J J,HANCOCK J,ALARCON J E.Correlations between duration and number of effectivecycles of earthquake ground motion[J].Soil Dynamicsand Earthquake Engineering,2006,26(1):1-13.
[12]JUSTIN J K,JONATHAN P S.Prediction equationsfor significant duration of earthquake ground motionsconsidering site and near-source effects[J].Earth-quake Spectra,2006,22(4):985-1013.
[13]TRIFUNAC M D,BRADY A G.A study on theduration of strong earthquake ground motion[J].Bulletin of the Seismological Society of America,1975,65(3):581-626.
[14]伍平,于建华.结构抗震设计中地震动输入的若干问题[J].西南交通大学学报,2002,37(Sup.1):44-49.WU Ping,YU Jianhua.Review on seismic input inaseismic design[J].Journal of Southwest JiaotongUniversity,2002,37(Sup.1):44-49.
[15]HWANG J H,YANG C W.Verification of criticalcyclic strength curve by Taiwan Chi-Chi earthquakedata[J].Soil Dynamics and Earthquake Engineering,2001,21(3):237-257.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心