桥梁结构运营模态参数识别方法对比.pdf

《桥梁结构运营模态参数识别方法对比.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、桥梁建设2017年第47卷第5期(总第246期)24BridgeConstruction，V01．47，No．5，2017(TotallyNo．246)文章编号：1003—4722(2017)05--0024—06桥梁结构运营模态参数识别方法对比单德山，黄珍，李乔(西南交通大学桥梁工程系，四川1成都610031)摘要：为比较不同桥梁运营模态分析理论和方法在实际桥梁长期运营中的识别效果和效率，以某大跨度斜拉桥健康监测系统1年的实测数据为依托，用探索性数据分析方法对桥梁实测数据进行评判，从实测数据中筛选符合识别方法基本假定的数据，分别运

2、用频域和时域运营模态参数识别方法识别该桥主梁和斜拉索12个月的运营模态参数，并对识别结果进行对比分析。分析结果表明：不同构件可采用不同的识别方法，基于自适应总体平均经验模态分解的数据驱动随机子空间法对运营状态下斜拉桥主梁的密集模态参数识别效果最好；峰值拾取法能准确、快捷地识别运营状态下斜拉索的模态参数。关键词：大跨度桥梁；运营模态分析；频域；时域；参数识别方法；探索性数据分析中图分类号：U441．3；U446．3文献标志码：AComparisonofOperationalModalParameterIdentificationMet

3、hodsforBridgeStructuresSHANDe-shan，HUANGZhen，LIQiao(DepartmentofBridgeEngineering。SouthwestJiaotongUniversity，Chengdu61003l，China)Abstract：Tocomparetheidentificationeffectsandefficiencyofthedifferentoperationalmodalanalysistheoriesandmethodsusedforthelong—termoperation

4、oftherealbridgestructures，thedatameasuredin1yearbythestructuralhealthmonitoringsystemofalongspancable—stayedbridgeweretakenastheexampleandthedatawereassessed，usingtheexploratorydataanalysismethod．Thedatathatcouldsatisfythebasicassumptionsoftheoperationalmodalparameteri

5、den—tificationmethodswerescreenedfromthemeasureddata，theoperationalmodalparametersofthemaingirderandstaycablesofthecablPstayedbridgeinthe12monthswereidentified，respective—lyusingthefrequency—-domainandtime—-domainoperationalmodalparameteridentificationmethodsandtheiden

6、tificationeffectswerecomparedandanalyzed．Theresultsoftheanalysisindicatethatforthedifferentcomponentsofthebridge．thedifferentidentificationmethodscanbeused．Thei—dentifieationeffectsofthedensemodalparametersofthemaingirderofthebridgeintheoperationstate，usingthedata—driv

7、enstochasticsubspaceidentificationalgorithmbasedontheselfadaptiveandgenerallyaverageempiricalmodaldecompositionarethebestwhilewiththepeakvaluepick—upmethod，themodalparametersofthestaycablesofthebridgeintheoperationstatecanbeaccu—ratelyandrapidlyidentified．Keywords：long

8、spanbridge；operationalmodalanalysis；frequency—domain；time—domain；parameteridentificationmethod；exploratorydataanalysi