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时间:2020-06-21
《位移谱阻尼调整系数的影响分析.pdf》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3O卷第1期结构工程师Vo1.30.No.12014年2月StructuralEngineersFeb.2014位移谱阻尼调整系数的影响分析王国伎胡克旭(同济大学结构工程与防灾研究所,上海200092)摘要将848条地面加速度记录分别按矩震级(M)、观测点到断层面最近距离(Rnm)和场地条件进行分类,研究了、场地条件和重要持时(D)对位移谱阻尼调整系数(DSF)的影响。结果表明:对DSFd的影响显著,R。对DSF的影响较弱,场地条件对DSFd的影响微弱。D是影响DSFd的一个重要因素。、R场地条件和D对DSF的影响与阻尼比()和周期()有关:"-3>5%时,在≥1S的范围内,随着、R。和
2、D的增大,DSFd减小,且和越大,DSFd减小的程度越大。当<5%时,在≥0.2s范围内,随着、R和D的增大,DSFd增大且越小,DSFd增大的程度越大。在短周期范围内(如f>5%时,T3、turalEngineeringandDisasterReduction,TongjiUniversity,Shanghai200092,China)Abstract848groundaccelerationrecordsareorderlygroupedaccordingtomomentmagnitude(M),dis—tancetoruptureplane(R。)andsiteconditions,respectively.Basedontheclassification,theinfluencesofM,Rnm,siteconditionsandsignificantduration4、(D5_q5)onthedampingscalingfactor(DSFd)areinvestiga—ted.Consequently,thereisasignificantdependencebetweenDSFdandMandaweakdependencebetweenDSFdandRp.SiteconditionsinfluencetheDSFdbuttoamuchlessdegreethanthoseofMandRp.D5-95isanimportantfactorcontrollingtheDSFd.Theeffectsofthe,R。,siteconditionsandD5_95、5onDSFddependonthedampingratio()andperiodofvibration(T).TheDSFddecreasesasM,RpandD5-95increasesatlongperiodsif>5%.ThepatternwithM,R。andD5-95ismuchmoresignificantifTislongerorislar—ger.TheDSFdincreasesasM,Rn1。andD5.95increasesatmorerangeofperiodsif<5%.ThepatternwithM,RpandD5-95ismuchmoresignificant6、if专issmaller.AlmostNOpatternwithM,RpandD5_95isseenatshorterperiods。TheefectsofD5.95onDSFcanbecapturedbyincludingRpasoneofthepredictorvariablesintheregressionmodelinadditiontoM.Keywordsmomentmagnitude,distancetoruptureplane,sitecondition,significantduration,dampingscalingfactorfordisplacementspectr7、a性反应谱。目前,抗震规范普遍采用的方法是通1引言过阻尼调整系数(DSF)从5%阻尼比的弹性反应谱去估计不同于5%阻尼比的弹性反应谱。现行在结构的抗震设计中需要不同阻尼比下的弹抗震规范中阻尼调整系数通常取决于结构的收稿日期:2013—04—03联系作者,Ernail:802212wgt@tongji.edu.CNStructuralEngineersVo1.30,No.1·102·EarthquakeandWindRes
3、turalEngineeringandDisasterReduction,TongjiUniversity,Shanghai200092,China)Abstract848groundaccelerationrecordsareorderlygroupedaccordingtomomentmagnitude(M),dis—tancetoruptureplane(R。)andsiteconditions,respectively.Basedontheclassification,theinfluencesofM,Rnm,siteconditionsandsignificantduration
4、(D5_q5)onthedampingscalingfactor(DSFd)areinvestiga—ted.Consequently,thereisasignificantdependencebetweenDSFdandMandaweakdependencebetweenDSFdandRp.SiteconditionsinfluencetheDSFdbuttoamuchlessdegreethanthoseofMandRp.D5-95isanimportantfactorcontrollingtheDSFd.Theeffectsofthe,R。,siteconditionsandD5_9
5、5onDSFddependonthedampingratio()andperiodofvibration(T).TheDSFddecreasesasM,RpandD5-95increasesatlongperiodsif>5%.ThepatternwithM,R。andD5-95ismuchmoresignificantifTislongerorislar—ger.TheDSFdincreasesasM,Rn1。andD5.95increasesatmorerangeofperiodsif<5%.ThepatternwithM,RpandD5-95ismuchmoresignificant
6、if专issmaller.AlmostNOpatternwithM,RpandD5_95isseenatshorterperiods。TheefectsofD5.95onDSFcanbecapturedbyincludingRpasoneofthepredictorvariablesintheregressionmodelinadditiontoM.Keywordsmomentmagnitude,distancetoruptureplane,sitecondition,significantduration,dampingscalingfactorfordisplacementspectr
7、a性反应谱。目前,抗震规范普遍采用的方法是通1引言过阻尼调整系数(DSF)从5%阻尼比的弹性反应谱去估计不同于5%阻尼比的弹性反应谱。现行在结构的抗震设计中需要不同阻尼比下的弹抗震规范中阻尼调整系数通常取决于结构的收稿日期:2013—04—03联系作者,Ernail:802212wgt@tongji.edu.CNStructuralEngineersVo1.30,No.1·102·EarthquakeandWindRes
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