液化场地地下RC结构物抗震性能数值仿真研究

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1、镕‰——单位代码：—地堑!{{』MⅢⅢ含肥工学火警HefeiUniversityofTechnology硕士学位论文MASTERDISSERTATIoN③论文题目：液化场地地下Rc结构物抗震性能数值仿真研究学位类别：——学历硕士学科专业：(工程领域)堂圭三堡作者姓名导师姓名完成时间黄展华汪明武教授2007年4月NumericalsimulationexperimentsofseismicperformancesofundergroundRCstructuresinliquefiablesoilsAbstractNowadays，theundergroundreinfor

2、cedconcretestructuresarewidelyusedinhydraulicengineeringandwaterelectricityengineering，communicationtransportationsuchasroadandrailway,andimportantprojectsinmetropoliscities．Theresultsfromtheinvestigationsinthehistoricalearthquakecasesshowthatearthquake-inducedliquefactionwillcausedestru

3、ctionsoftheundergroundreinforcedcoacrete(RC)structures，andleadtothehugelossofeconomyandthepersonnelcasualty．SothestudyonseismicstabilityandseismicsafetyoftheundergroundRCstructuresinliquefiablesoilsisextremeimportanceforsafeguardingthepeople’Slivesandproperties．Basedontheeffectivestressa

4、nalysismethod，thispapercarriedonthenumericalsimulationexperiments，whichareindifferentdepthandboundaryconditions，oftheundergroundRCstructureinliquefiablesoils，inordertoinvestigateintothemechanismofinteractionbetweentheliquefiablesoilandtheRCstructure．andtheprinciplesofdestructionofRCstruc

5、tureunderdifierentearthquakemotions．Theprinciplesofdistributionofacceleration，displacement，eXCeSSporewaterpressurearediscussed．TheresultsCanprovidescientificbasisandthereferencesfortheseismicdesignandtreatmentsofRCstructuresintheliquefiablesoilsunderstrongmotions．Theresultsfromthenumeric

6、alsimulationexperimentsindicatedthatthesoillayerinshallowdepthiseasytoliquefyunderearthquakemotion，Thevaluesofeffectivestressacting0nthesidewallsofRCstructureatthebeginningofearthquakeshakingaresmallerthanthoseaftertheshaking．TheplasticareaofRCstructureoccurredfirstlyonthecoiners．Thevalu

7、esofthelateraldisplacementandthehorizontalaccelerationincreasedalongwiththedepth．ThesidewalldistortionandthefloatingdisplacementdecreasedalongwiththeincreaseoftheburieddepthofRCstructure．Onthecontrary,theearthpressureincreased，andthevaluesoflowersidearebiggerthanthoseofup