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1、Hammer’sImpactForceonPileandPile’sPenetrationJi-ChengWangInstituteofArchitecturalEngineering,NingboUniversityofTechnology,Ningbo,Zhejiang,ChinaJianlinYuCollegeofCivilEngineeringandArchitecture,ZhejiangUniversity,Hangzhou,ChinaMaShiguoNingboUrbanConstructionInvestmentHoldingCompanyLimite
2、d,Ningbo,Zhejiang,ChinaXiaonanGongCollegeofCivilEngineeringandArchitecture,ZhejiangUniversity,Hangzhou,ChinaAddresscorrespondencetoJi-ChengWang,No.201,FenghuaRoad,JiangbeiDistrict,Ningbo,Zhejiang315211,China.E-mail:wjc1818@zju.edu.cnDownloadedby[JichengWANG]at21:2229May2015Colorversions
3、ofoneormoreofthefiguresinthearticlecanbefoundonlineatwww.tandfonline.com/wifa.AbstractMethodsofenergyandmomentumconservation,vibrationtheories,andmodeltestsareemployedtoresearchintoimpactforceofhammeronpileandpile’spenetrationAnalyticalformulaofimpactforceofhammeronpileisobtained.Compar
4、isonofresultsfromthethreemethodsfindsthattheanalyticalformulaproposedbythispaperconformswelltopracticalsituations.Researchresults1showthat,Ifhammer’simpactenergyremainsunchanged,Penetrationincreaseswiththeincreaseofhammerweightandcushionstiffness;Impactforcethepileheadreceivesdegradeswi
5、ththeincreaseofhammerweightbutincreaseswiththeincreaseofcushionstiffness;Impacttimedecreaseswiththeincreaseofcushionstiffnessbutincreaseswiththeincreaseofhammerweight.Modeltestshowsthat,comparedwithcottonclothcushion,elasticcushion’sadvantageslieinthatrelativelysmallpileheadimpactforcec
6、anachievebigpilepenetration,andcottonclothisgraduallycompactedwiththeincreaseofblowcounts,henceimpactforcethepileheadreceivestendstoincreasegradually.KeywordsINTRODUCTIONHammerpilingissimpleandeconomical,andhasagreatpenetrability,henceiswidelyused.However,hammer’simpactforceonpileisusua
7、llyverybig,thuscausingdamagetopilehead.Besides,hammerweightselectionisgenerallyempirical.Hammer’simpactforceonpileisusuallycalculatedthroughpiledrivingformula,whicharededucedfromlawsofenergyandmomentumconservationtogetherwithempiricalparametersasenergyutilizationefficiency,Down
