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时间:2019-05-31
《地震安全性评价中地震动衰减关系的类型及其选取》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第3期地震工程学报Vol.35No.32013年9月CHINAEARTHQUAKEENGINEERINGJOURNALSept.,2013地震安全性评价中地震动衰减关系的类型及其选取①文雯1,2,陈宇军2,王珏2,邓晓华,3,杨雅琼4(1.中国科学技术大学,安徽合肥230026;2.云南省地震局,云南昆明650224;3.中国地震局地球物理勘探中心,河南郑州450023;4.河北省地震局,河北石家庄050021)摘要:通过阐述地震安全性评价工作中地震动衰减关系的演变介绍了衰减关系的三种类型,其差别2CM在于是否含有高频地震动震级饱和因子C3M项和加速度
2、近场饱和因子C5e6项;分析了这两个因子的由来和作用,并举实例说明,当场地所处的地震环境受高频地震动影响较小时,可忽略C23M项的影响;而加速度近场饱和因子因包含了震源体尺度的影响,并与实际观测记录相符,是衰减关系必须包含的内容。关键词:衰减关系;高频地震动;震级饱和因子;加速度近场饱和因子中图分类号:P315.912文献标志码:A文章编号:1000-0844(2013)03-0709-06DOI:10.3969/j.issn.1000-0844.2013.03.0709TypeandSelectionoftheGroundMotionAttenuationR
3、elationsduringSeismicSafetyEvaluation1,2,CHENYu-jun2,WANGJue2,DENGXiao-hua1,3,YANGYa-qiong4WENWen(1.UniversityofScienceandTechnologyofChina,HefeiFujian230026,China;2.EarthquakeAdministrationofYunnanProvince,KunmingYunnan650024,China;3.GeophysicalExplorationCenter,CEA,ZhengzhouHenan4
4、50023,China;4.EarthquakeAdministrationofHebeiProvince,ShijiazhuangHebei050021,China)Abstract:Throughthedescriptionoftheevolutionofattenuationrelation,threetypesofattenua-tionrelationsareintroduced(typeⅠ,typeⅡ,typeⅢ),withthedifferencesamongtheminclu-2(adingwhethertheycontainthehigh-f
5、requencygroundmotionmagnitudesaturationfactorC3Mnon-linearattenuationfactorofmagnitudeM)andtheaccelerationnear-fieldsaturationfactorCMC5e6(adistancefactor).Theoriginsandfunctionsoftwosuchfactorsareanalyzedinthisstud-y.ThegroundmotionincreaseswiththeincreasingofM,buttheamplitudeofitr
6、apidlydecrea-CMseswiththeincreasingofM.C5e6playsaroleintheseismicsourcebody'srangescale,inwhichthegroundmotionvariesnotalongwiththedistances'changeintheepicentralarea.Thecom-2CMbinedeffectsofC3MandC5e6stronglyinhibitthefalseinformationthatthenear-fieldgroundmotionistoolargeinthecase
7、ofhigh-magnitude,soastoreachalevelconsistentwiththeactualCMsituation.Theaccelerationnear-fieldsaturationfactorC5e6isthecontentthattheattenuationrelationmustcontain,becauseitcontainstheinfluencesoftheseismicsourcesizeandcorrelateswiththeactualobservationdata.2Intheseismicsafetyevalua
8、tion,C3Mitemcanbech
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