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ID:37349105
大小:5.18 MB
页数:99页
时间:2019-05-22
《斜拉桥结构健康监测中的温度效应影响分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、同济大学土木工程学院硕士学位论文斜拉桥结构健康监测中的温度效应影响分析姓名:李建华申请学位级别:硕士专业:桥梁与隧道工程指导教师:孙利民;淡丹辉20060301摘要影响,而竖向位移主要受索塔梁温差和主梁温度梯度的影响。(4)斜拉索的索力受整体温差作用和索塔梁温差的影响较大。(5)温度作用对结构动力特性会产生一定的影响,单具体的影响程度还需要进行进一步的分析。最后,结构性能变化分析的结果用于桥梁健康监测的测点布设中,得到了针对温度作用的应力及变形监测的推荐测点位置。桥梁健康监测中的结构损伤识别方法采用力学
2、反分析的手段通过结构监测数据对结构特性进行推求,而结构损伤及性能演变分析属于力学正分析的范畴,对各种环境作用影响的考虑更为真实,计算理论也更为成熟。结构损伤及性能演变分析与结构损伤识别的结合,可以更好地为桥梁健康监测服务。●关键词:斜拉桥,健康监测,损伤分析,性能变化,温度,东海大桥IlAbstractABSTRACTThedevelopmentofstructuralhealthmonitoringtechnologyforthesurveillance,evaluationandassessment
3、ofexistingornewlybuiltbridgeshasnowattainedsomedegreesofmaturity.Manycable·stayedbridgesoflargespanhavebeenequippedwiththehealthmonitoringsystems.Successfulimplementationandoperationhavebeenwidelyreportedallovertheworld.However,stillmanyproblemsaleunsett
4、ledduringthedesignofaneffectiveandreasonablemonitoringsystem.Thekeyissueofbridgehealthmonitoringistolocatethedamage,andattaintheextentofthedamage.Generallytherearetwowaysforthis,oneisthelocalmethod,andtheotheriStheglobalmethod.Thelocalmethodsmainlyrefert
5、othenondestructivetestfr,rDT)techniques,suchastheacousticemissiontechnique,thevisualinspection,theelectromagneticfieldtest,andete,todetectandlocatestructuraldamageofcomponentlevel.Theyrequirethestructuraldamageofsomeknownvicinity.Theglobalmethodstrytodet
6、ectdamagebycheckingstructuralglobalvibrationparametersandattractmoreresearchattentionrecently.Inreality,however,acivilstructureissubjectedtovaryingenvironmentalandoperationalconditionssuchastraffic,humidity,wind,solar-radiationandaswellasthetemperature.T
7、heenvironmentaleffectsinducethevariationofbothlocalandglobalindexofthestructure,whichmaymaskthechangecausedbystructuraldamage.Toanalysistheenvironmentaleffects,amethodcalledStructureDamageandPerformanceEvolvementAnalysis(SDPEA)isbroughtout.Thefollowingar
8、ethemaintasksconductedinthepaper:firstly,theconceptoftheSDPEAisexplained,includingthemeaning,thetechnicalroutine,andtwoanalyzingstagesoftheSDPEA;secondly,forthecable—stayedbridge,somespecialpointsthatshouldbeconcernedforSD
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