资源描述：
《沉箱加桩复合基础地震响应离心试验》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、文章编号：1000－7598(2014)02－0380－09沉箱加桩复合基础地震响应离心试验锐1,2，黄茂松1,2钟（1.同济大学地下建筑与工程系，上海200092；2.同济大学岩土及地下工程教育部重点实验室，上海200092）摘要：针对沉箱加桩复合基础地震响应问题开展动力离心试验研究。采用砂质粉土作为地基土，上部结构简化为质点和柱体，基础类型包括单桩、沉箱、沉箱加桩复合基础，利用层状剪切模型箱消除边界反射，以上海人工中波为输入波，在50g离心加速度场下进行水平地震试验。根据基础形式的不同进行3组试验，试验结果表明：对于
2、刚度较小的土，地震波向上传播过程中具有加速度衰减的特征；沉箱底部加桩对于降低基础和结构地震响应有积极的效果，有利于增强其抗震能力；地表、基础、结构的地震响应频率特性各不相同，这取决于其各自不同的自振特性；土与基础、基础与结构之间均会发生地震相互作用，但只有与相互作用对象自振频率均较接近的地震频域分量才能引起明显的相互作用。关键词：沉箱加桩复合基础；离心试验；地震；相互作用；频率特性中图分类号：TU435文献标识码：ACentrifugetestsforseismicresponseofcaisson-pilecompos
3、itefoundationZHONGRui1,2,HUANGMao-song1,2(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;2.KeyLaboratoryofGeotechnicalandUndergroundEngineeringofMinistryofEducation,TongjiUniversity,Shanghai200092,China)Abstract:Dynamiccentrifugetests
4、arecarriedouttostudyseismicresponseofcaisson-pilecompositefoundation.WithShanghaisandysiltchosenastestsoil,laminarshearingboxusedtoeliminatereflectionattheboundary,andShanghaiartificialmiddlewaveistakenastheinputmotion,threetestswithdifferentfoundationtypesarecon
5、ductedunderthecentrifugeaccelerationof50g.Singlepile,caissonandcaisson-pilecompositefoundationarethefoundationtypesforthosethreetests,andallthesuperstructuresinthesetestsaresimplifiedasmasspointsandconnectingcolumns.Testresultsindicatethat,forsoilwithlowstiffness
6、accelerationdecaysintheprocessofearthquakewavepropagatingupwards;addingpilesunderthecaissoncoulddecreasetheearthquakeresponsesofboththefoundationandstructure,sothereinforcementofthesysteminresistingearthquakesisexpected;frequencycharacteristicsoftheresponsesatsoi
7、lsurface,foundationandstructurearealldifferentfromeachotherdependingontheirownnaturalvibrationcharacteristics;andfortheinteractionbetweensoilandfoundation,orfoundationandstructure,onlytheearthquakecomponentwithsimilarfrequencywithbothinteractingsidescancauseremar
8、kableearthquakeinteraction.Keywords:caisson-pilecompositefoundation;centrifugetest;earthquake;interaction;frequencycharacteristic析方法研究了该基础对侧向动力荷载的抵抗能力。由于该基础形式比
