高速铁路混凝土重力式桥墩抗震验算方法分析-(6282)

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1、高速铁路混凝土重力式桥墩抗震验算方法研究AbstractGravitypierswithlowreinforcementratioslessthan0.5%havebeenwidelyusedinChina'shigh-speedrailwaysystem(eveninhighlyseismicintensityzone).ButthecurrentCodeforseismicdesignofrailwayengineeringhasnoclearprovisionforthem.Thedissertationstudiedanti-seismiccheckingmethodsofgra

2、vitypierswithlowreinforcementratios,inordertoprovidethebasisforseismicdesignofthesepiers.Themainworkisasfollows:(1)Afterreadingalotofliterature,analyzedthedamagecharacteristicsofreinforcedconcretepiersandreinforcedconcretepierswithlowratios,sumedupthecurrentsituationofanti-seismicstudyonpierswith

3、lowsteelratiosandpointedouttheexistingproblemsoftheseismicdesign.(2)Takinghigh-speedrailwaygravitypierswithlowreinforcementratiosforstudy,whichhavecommonspan,Conductedquasi-statictestonpiermodels(1:8)withdifferentreinforcementratios(0.1%-0.5%)andstudiedthefailurecharacteristics,deformationcapacit

4、y,carryingcapacity,hystereticbehavior,skeletoncurvesandenergydissipationcapacity.(3)Studiedthecheckingindicatorsandtheirreasonablelimitsofgravitypierswithlowreinforcementratiosundertheeffectoflow-levelearthquake.Consideringthesmallamountoflongitudinalbarsarebeneficialtostrengthandstabilityagainst

5、overturningofthepiers,wecanchoosedifferentallowableeccentricitybydifferentsteelratioswhenuseeccentricitytocheck.Alsodiscussedthefeasibilityofapplyingtheallowablestressmethodcheckingseismicperformanceofthepiers.(4)Studiedthethelimitedductilityseismicdesignmethodsandnonlinearanalyticalmodelunderthe

6、effectofhigh-levelearthquake.Basedontheresultofthemodeltest,gavethelimitedductilityfactors.Aspecificexamplewasanalyzed,whichverifiedtheanalysiswasfeasibility.(5)Basedontheprincipleofenergyequal,proposedasimplifiedanalysismethodofgravitypiersundertheeffectofhigh-levelearthquake,gavethespecificproc

7、essesoftheanalysis.Appliedthismethodtostudythehigh-speedrailway32mcharpydoubletrackbridgepiers,gotthelowerlimitofreinforcementratiosofdifferentseismicintensityzone.Keywords:railway；low-levelearthquake；high-levelearthqu