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时间:2020-03-25
《基于扩展增量动力分析的桥梁地震易损性研究.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29卷第9期2012年9月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.29No.9Sep.2012doi:10.3969/j.issn.1002—0268.2012.09.008基于扩展增量动力分析的桥梁地震易损性研究陈力波,郑凯锋,栗怀广,张建经(西南交通大学土木工程学院,四川成都610031)摘要:采用扩展增量动力分析方法,建立了汶川地区典型简支梁桥的分析型地震易损性模型。依据汶川地震桥梁震后调查资料,评估了桥梁结构参数的不确定性,通过抽样并建立一系列桥梁的有限元模型样本。将汶川地震实测地
2、震波调幅至不同的地震动强度,对每一级地震动强度下对不同样本进行非线性动力时程分析,记录桥梁各构件对应的地震峰值响应并绘制成IDA曲线。基于EDP准则和IM准则2种不同方法,分别计算得到不同地震动强度下桥梁发生各损伤状态的离散概率数据点,采用最小二乘法回归得到不同损伤状态对应的桥梁构件和系统地震易损性曲线。生成的地震易损性曲线可以进一步用于交通网络系统的地震风险评估和震后加固优先级决策。关键词:桥梁工程;桥梁地震易损性;扩展增量动力分析;对数正态分布;工程需求参数;地震动强度中图分类号:U442.5+5;TU352.1文献标识码:A文章编号:1002—0268(2012)09—00
3、43—07ResearchofBridgeSeismicVulnerabilityBasedonExtendedlncrementaIDynamicAnalysisCHENLibo,ZHENGKaifeng,LIHuaiguang,ZHANGJianjing(CollegeofCivilEngineering,SouthwestJiaotongUniversity,ChengduSichuan610031,China)Abstract:Theanalyticalseismicvulnerabilitymodeloftypicalsimplysupportedgirderbridg
4、einWenchuanareawasdevelopedusingtheextendedincrementaldynamicanalysisapproach.Basedonthecollecteddataofbridgedamagein2008WenchuanEarthquake,theuncertaintyofbridgeparameterswasanalyzedandasetoffiniteelementmodelsamplesofbridgeswereproducedandasetoffiniteelementmodelsamplesofbridgeswasproducedb
5、ysampleanalysis.TheWenchuanEarthquakegroundmotionswerescaledtodifferentintensityintensities,inwhichseismicpeakresponsesofeachbridgecomponentswererecorded,andthenonlineardynamictransientanalysisofdifferentsamplesundereachintensitylevelwerepreformed,inwhichseismicpeakresponsesofeachbridgecompon
6、entswererecordedandtheIDAcurvesweredeveloped.ByemployingtwoapproachesbasedonEDP—criterionandIM-criterion,thediscreteprobabilisticdatapointsofeachbridgedamagestateunderdifferentintensitieswerecalculated,andtheseismicvulnerabilitycurvesofbridgecomponentsandsystemineachbridgedamagestateweregener
7、atedbyusingtheleastsquaresregression.Thegeneratedseismicvulnerabilitycurvescouldbeusedforseismicriskassessmentoftransportnetworksystemandbridgeretrofitprioritization.Keywords:bridgeengineering;bridgeseismicvulnerability;extendedincrementaldyn
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