几种平面应变加载路径下混凝土本构关系的试验研究

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1、北京交通大学硕士学位论文几种平面应变加载路径下混凝土本构关系的试验研究姓名：赵瑾申请学位级别：硕士专业：岩土工程指导教师：王哲20061001ABSTRACTAlthoughmanyexi]erimentalresultsinfailurecriterionandconstitutiverelationofconcretehavebeenreported，mostofthemwereonlyapplicabletosimpleproportionalmonotonicloading．nethesisdealswithth

2、eexperimentalstudyontheconstitutiverelationshipsofconcreteunderonekindofcomplexloadingpaththatcontainsthefeedbackcontrolofstraim呻roportionalmonotonicloadingpathwithconstantconfiningdeformationunderstresssphericaltensor．Thethesisincludesfivechaptersasfollows．11圮fi

3、rstchapterispreface．Itexpoundsthesignificanceofthisstudyandtherelevantliteratures．Meanwhilethehistoricalandpresentbackgroundoftheresearchofexperimentandtheoryplainconcreteisintroducedsystematically．Basedontheinformation,theobjectivesofthispaperareputforward．n圮sec

4、ondchapterintroducesdesignofexperiment．preparationofconcretespecunens，testsystemandoperatingprocedure．11letllirdandfourthchaptersarebasedonthetestdatumandcompletestress·straincurvesunderproportionalmonotonicloadingpathwithconstantconfiningdeformationunderisometri

5、cstresssphericaltensororvaryingstresssphericaltensor．nlcbasicregularitiesofthestrengthanddeformation,thecharacteristicsofstresspath,stress．strainClllWCS，volumetricdeformation，Poissonratioandmaterialmodulusaresummarized．Experimentalresultsindicatethattheconditiona

6、lfailurecriterionisapplicabletotheloadingpathinthisthesis．nethesisprovidestheexperimentbasisforthefurtheranalysis．nlcfifthchapteriStheconclusion．111emainachievementsofthispaperaresummarizedandthefurtherresearchofthisfieldispointedout．KEYWORDS：concreteconstitutive

7、relationstressdeformationsphericaltensorstrengthvolumetricdeformationPoissonratio主要符号表口：Y轴向荷载与x轴向荷载的加载比例(Py：Px)夕：加载比例口的比值Z：减摩单轴抗压强度D乞：试件达到峰值时的八面体正应力吃：试件达到峰值时的八面体剪应力f’。：对应于试件达到峰值时的吒按过镇海五参数准则计算得出的八面体剪应力口：峰值时应力的相似角(将以q在Ⅱ平面上的投影轴为起点向cr2在Ⅱ平面上的投影轴转动的逆时针方向定义为目的方向)叩：陋一f’。

8、I／吃的值勺：Y轴向的峰值应变叱：相应于uyb—Py曲线结束峰值开始进入软化下降段时的应变值oo：八面体正应力％：八面体剪应力％：八面体正应变，，。：八面体剪应变白：体积变形临界应变即在体应变曲线上由体积压缩转向体积膨胀的临界体应变(发生扩容现象时的体应变)致谢本文是在导师王哲老师的精心指导下完成的。两年多来，导师对