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1、第25卷第4期 铁 道 学 报Vol.25No.42003年8月JOURNALOFTHECHINARAILWAYSOCIETYAugust2003文章编号:100128360(2003)0420089208西宁北川河钢管混凝土拱桥的理论和实验模态分析1211宗周红,BijayaJaishi, 林友勤, 任伟新12(福州大学土木建筑工程学院,福建福州 350002;Tribhvan大学Pulchowk校区工程研究所,尼泊尔加德满都)摘 要:对西宁北川河钢管混凝土拱桥进行了理论与实验
2、模态分析,该桥为中承式钢管混凝土系杆拱桥,净跨90m,桥面净宽21.6m。本文首先介绍了现场环境脉动实验概况,利用频域中的单模态识别法(SDOFI)、峰值法(PP)和时域中的随机子空间识别法(SSI)分别进行桥梁动力参数识别;利用ANSYS建立了全桥三维有限元模型,并进行了参数修正,理论和实验模态分析结果具有相当好的吻合程度。参数分析表明:不同规范的动力特性计算结果是有一定差别的。此类测试和分析可以提供结构健康监测的基准模型,服务于结构状态评估和修复。关键词:钢管混凝土拱桥;模态分析;环境振动;系统识别;有限元方
3、法中图分类号:U448.225 文献标识码:AExperimentalandanalyticalmodalanalysisofaCFTarchbridgeoverXiningBeichuanRiver1211ZONGZhou2hong,BijayaJaishi,LINYou2qin,RENWei2xin(1SchoolofCivilEngineeringandArchitecture,FuzhouUniversity,Fuzhou350002,China;2InstituteofEngineering,Trib
4、hvanUniversityPulchowkCampus,Kathmandu,Nepal)Abstract:Thepaperpresentstheexperimentalandanalyticalmodalanalysisonaconcrete2filledsteeltubular(CFT)archbridgeovertheBeichuanRiverinXining,QinghaiProvince,China.Thearchbridgeisahalf2throughCFTbridge,withthespanof9
5、0mandthewidthof21.6m.Thefieldtestiscarriedoutconductingambientvibrationtestingundertraffic2inducedexcitation.TheSingular2Degree2of2Freedomidentification(SDOFI)methodandthepeakpicking(PP)methodinfrequencydomainandthestochasticsubspaceidentification(SSI)methodi
6、ntimedo2mainareusedfortheoutput2onlymodalidentification.Agoodagreementinidentifiedfrequencieshasbeenfounda2mongthesemethods.The32Dfiniteelementmodels(FEM)areconstructedandananalyticalmodalanalysisisthenperformedtogeneratenaturalfrequenciesandmodeshapesinthe32
7、orthogonaldirections.Thefiniteelementmodelisvalidatedtomatchthefieldnaturalfrequenciesandmodeshapesofthebridge.Theparameteranalysisindicatesthatthedynamiccalculationsfromdifferentdesigncodesaredifferent.ItisfurtherdemonstratedthattheresultsfromtheFEMagreeswel
8、lwiththefieldtestsandcanserveasabaselinemodelintheseismicevaluation/retrofittingofthebridge.Keywords:concrete2filledsteel2tabulararchbridge;modalanalysis;ambientvibration;systemidentifica
