工作状态下自立式平臂塔吊动力特性现场实测及影响因素分析

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关键词：平臂塔吊；动力特性；现场实测；正交试验；有限元模型修正 中图分类号：TU311.3；TH213.3 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202312006

Field test and analysis of influence factors on the dynamic characteristics of self-supporting flat arm tower crane under multiple working conditions

ZHANG Qinghua’，WANG Zhihao1，YANGHui²，ZHAO Jinming²，XU Yanwei1 （1.Schoolof CivilEngineering and Transportation，North China Universityof WaterResourcesandElectricPower， Zhengzhou 450045，China；2.China Construction Third Engineering Bureau Group Co.，Ltd.，，Wuhan 43O064，China）

Abstract：Inordertoobtainmoreacurateandrefineddynamiccharacteristicsoftheflatboomtowercrane，thfieldtestofthedy namicresponseofthetypicalfrestandingflatboomtowercranewascariedoutconsideringtheinfluenceofliftingpositions，lifting heights（ropelengths）andliting weights.Thetestresultsshowthatthevibrationalongtheboomaxialdirectionandverticaldirectionhasgoodsychronzation.However，theresponsecorrelationbetweenthehorizontaldirectionoftheverticalboomandtheai alandverticaldirectionofthetowercraneboomisrelativelylow.Thenaturalfrequenciesidentifiedbythehalf-powerbandwidth methodandtheSSI-COVmethodarebasicallythesame，withthediferenceoflifting positions，ropelengthsandliftingweights， thenaturalfrequenciesofflatboomtowercranewillfuctuatearoundthenaturalfrequencyundernoload.Therearesomediferenc esinthedentificationresultsofthedampingratiobetweenthetwometods，inmostworkingconditions，thedampingratioidenti fied bythe SSI-COVmethodissmaller than thatidentifiedbythehalfpowerbandwidth method.Basedonorthogonal testanaly sis，the influenceoftheabovefactorsonthe naturalfrequencyanddampingratioof thetowercraneisnotsignificant，and there is no maineffect.Inaddition，thefiniteelementmodeloftheflatarmtowercraneisoptimized，andthefrequencyoftheupdatedmodelis ngoodagreementwiththetestresults.Theboomvibrationmodefunctionunderno-loadconditionwasfted，theamplitude distributionalong theboomlengthexhibitsanapproximatelylinear，however，whentheliftingweightappearsattheendorrotof the boom，the boom vibration mode may show an obvious nonliner characteristics.

Keywords： flatarm tower crane;dynamic characteristics;field test;orthogonal test;finite element model updating

塔吊是工程施工中重要的起重设备，广泛应用于城市高层建筑、桥梁、港口、水利和电力建设工程等众多领域。（剩余13954字）