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1、thThe14WorldConferenceonEarthquakeEngineeringOctober12-17,2008,Beijing,ChinaDAMAGEPATTERNSANDFAILUREMECHANISMSOFBRIDGEPILEFOUNDATIONUNDEREARTHQUAKE122XiaoWEIQingqiaoWANGJunjieWANG1EarthquakeAdministrationofShanghaiMunicipality,No.87LanxiRoad,Shanghai,China,2000622DepartmentofBridgeEngineering,Tong
2、jiUniversity,NO.1239SipingRoad,Shanghai,China,200092Email:Weihsiao@163.com,w_qqiao@yahoo.com.cnABSTRACT:Thispapergivesabrieflysummaryonseismicdamageofbridgepilefoundationsfrommajorearthquakessince1960s.Thetypicaldamagepatternsandcausesofpilefoundationfailurewithnoliquefaction-inducedandliquefactio
3、n–inducedarediscussed.Somecommentariesandprotectionmeasuresonseismicdesignofpilefoundationarealsogiveninthispaper.KEYWORDS:failuremechanism,bridgepilefoundation,liquefaction-induced,lateralexpandingINTRODUCTIONPilefoundationisawidelyapplieddeepfoundationtypeforcivilstructure.Itiseasilyfitforcomple
4、xgeologicsettingsandallkindsofloadconditions,especiallyforsoftsoilfoundation.Pilefoundationiswidelyusedinbridgeengineering,foritslargebearingcapacity,wellstabilityandsmalldifferentialsettlementcomparedtootherfoundationtypes.Accordingtothedamagestatisticsofbridgesinthepaststrongearthquakesoverlastt
5、hirtyyears,thestructureswithpilefoundationhaveabetteraseismicperformancethanthosewithoutpilefoundation,butdamageswerealsofoundinpilefoundation.However,comparedtosuperstructure,therewerefewerreportsaboutearthquakedamagesofpilefoundation,thereasonofwhichmaybethatpilefoundationsareembeddedunderground
6、,whichmaketheirdamageshardtobefound.Since1960s,severalmajorearthquakes,suchasthe1975Haicheng,1976Tangshanand1995Hyogoken-Nanbu(Kobe)earthquakesetc.,gaveexcellentindicationsofbridgepilefailureperformance,andenrichourunderstandingsaboutthebridgepilefoundationduringearthquakeloading.1.EARTHQUAKEDAMAG
7、EOFBRIDGEPILEFOUNDATIONLotsoffactorswillcausedamageofbridgepilefoundationunderearthquake,suchassoilconditions,excessiveinertiaforcecausedbysuperstructureandincorrectdesignofpiles.Accordingtothedamagestatisticsofp
