车辆荷载引起地面振动的实测研究

324JOURNALOFVIBRATIONANDSHOCKVol．32No．4201310DZ05818009732011CB0138002012－07－122012－08－2319791947111121．2000922．200092、。100m。TU435AFieldmeasurementsforgroundvibrationinducedbyvehicleJIABao-yin1LOUMeng-lin1ZONGGang1JIANGTong1LUXiu-li21．StateKeyLaboratoryforDisasterReductioninCivilEngineeringTongjiUniversityShanghai200092China2．TheArchitecturalDesignandResearchofTongjiUniversityGroundCo．LtdShanghai200092ChinaAbstractTostudygroundvibrationpropagationinducedbyrunningheavytruckfieldmeasurementsofgroundvibrationwereperformedduringheavytruckrunning．VibrationattenuationwasstudiedwithpeakaccelerationamplitudeFourierspectrumandvibrationlevels．Componentofbackgroundvibrationwasremovedfromthetotalgroundvibrationusingtwomethodsandthenafittedvibrationattenuationformulawasproposedbyadoptingthepatternsearchmethod．Itwasconcludedthattheverticaldirectionaccelerationisthepredominantcomponentoftheground-bornevibrationwithincreaseinvibrationsourcedistancethevibrationattenuatesgraduallybutthereisarapidlydecayingtrendnearvibrationsourcefromthefrequencydomainpointofviewthehigh-frequencypartisalmostcompletelydecayedafterashortdistancewhilethelowfrequencypartofthevibrationonlyshowmoderatedecayalongwithincreasingthedistancefromvibrationsourcethereisresidualvibrationoflowfrequencypartevenat100metersfar．Keywordstruckvibrationbackgroundvibrationvibrationlevelleastsquaresprinciplepropagation、。、、。1－2、、。Hao3。Hunt4－5Lombaert6、、、。7。。11.150、10、30、50、100m5。KinemetricsBasalt4xEpisensor325。5、。1201。1Fig．1Layoutofmeasuringpoints2Fig．2Measuringinstrument1Tab．1Truckbasicparameters/kg/kg/mm/mm25430128203200+13502030/18936×41.22020。。。35Fig．3Timehistoriesofverticalaccelerationsat5measuringpoints45Fig．4Timehistoriesoftransverselaneaccelerationsat5measuringpoints55Fig．5Timehistoriesofaccelerationsalonglaneat5measuringpoints。。。10～100Hz170～300Hz20～50Hz10m10m。3～550Hz50m、100m。20。120。7－8。10m10m100m50．186gal。1146Fig．6Frequencyspectrumofverticalaccelerationandbackgroundacceleration7Fig．7verticalaccelerationpeakattenuation8Fig．8Verticalaccelerationpeaknormalization22.1。。8。《》9La=20lgara01LadBarm·s－2a0a0=10－6m/s2。。VLz=10lg∑20i=110Lai－Wi/[]102LaiidBWidB。。W=Fvr=mωa2r3Fvrmω。W=W1+W2+…+Wn443a2r=a2r1+a2r2+…+a2m1La=10lga2ra20=10lga2r1+a2r2+…+a2ma205Lai=10lga2ria206212013326510La10=10La110+10La210+…+10Lan107VLZ=10lg∑20i=110La1i10+∑20i=110La2i10+…+∑20i=110Lani()10=10lg10VLZ110+10VLZ210+…+10VLZn()108VLZ2=10lg10VLZ10－10VLZ1()109VLZ、VLZ1VLZ2、。10。atbtFaω=∫∞－∞ate－iωtdt10Fbω=∫∞－∞bte－iωtdt11ΔFω=Faω2－Fbω槡212θa。ctFcωFcω=ΔFcosθa+iΔFsinθa=ΔFeiθa13Fcωct=12π∫∞－∞Fcωe－iωtdω1410－1412。2.21/3。9Fig．9Verticalvibrationaccelerationlevel8111。122515。。2．3910Fig．10Vibrationlevelcomparisonbeforeandafterdeductingbackgroundvibration11Fig．11Thefittingcurveofverticalaccelerationpeak12Fig．12Thefittingcurveofverticalvibrationlevel314。10。10。。。320。。A=0．2exp－0．025r+0．8exp－0．28r15VLz=0．0767exp－0．288r+0．923exp－0．0042r16AVLzr。。‘1’。9。41。210m。3350Hz10m50Hz100。4。1VerbrakenHLombaertGDegrandeG．VerificationofanempiricalpredictionmethodforrailwayinducedvibrationsbymeansofnumericalsimulationsJ．JournalofSoundandvibration201133081692－1703．2．J．20083691160－1163．LOUMeng-linLIShou-jiHUANGTian-lietal．Spectralanalysisofsubway-inducedvibrationsJ．JournalofTongjiUniversitynatureScience20083691160－1163．3HaoHAngTCShenJ．Buildingvibrationtotraffic-inducedgroundmotionJ．BuildingandEnvironment2001363321－336．4HuntHEM．Modelingofroadvehiclesforcalculationoftraffic-inducedgroundvibrationasarandomprocessJ．JournalofSoundandVibration1991144141－51．5HuntHEM．Stochasticmodelingoftraffic-inducedgroundvibrationJ．JournalofSoundandVibration1991144153－70．6LombaertGDegrandeG．TheexperimentalvalidationofanumericalmodelforthepredictionofthevibrationsinthefreefieldproducedbyroadtrafficJ．JournalofSoundandvibration20032622309－331．7．J．2007285883－887．DENGYa-hongXIATang-daiCHENJing-yu．AnalysisofefficiencyofvibrationisolatinggroovesubjectedtovehicleloadJ．RockandSoilMechanics2007285883－887．8．D．．200230－40．9．GB/T50355—2005S．2005．10．J．2011304124－172．WangFu-tongTaoXia-xinZhengXinetal．PSDcorrectionmethodforremovingbackgroundvibrationfromtrafficenvironmentvibrationobservationJ．JournalofvibrationandShock2011304124－172．11．J．2009293282－288．LOUMeng-linJIAXu-pengYUJie-qin．FieldmeasurementandanalysisofgroundvibrationinducedbysubwaytrainsJ．JournalDisasterPreventionandMitigationEngineering2009293282－288．41201332