混凝土單雙軸力學性能的細觀數值模擬

1、北京工業(yè)大學碩士學位論文混凝土單雙軸力學性能的細觀數值模擬姓名：張超申請學位級別：碩士專業(yè)：水工結構工程指導教師：彭一江黎保琨20040501ABSTRACTInthetreatise，theinnerstructureofconcretespecimensisanalyzedonmeso—lcvelanditistakenascompositestructureofaggregates，matrixandtheInterfacialT

2、ransitionZone(ITZ)，azonebetweenaggregateandmatrixUsingWe／ravenfunctionandMonteCarlomethod，thepositionsandnumberofaggregatesareidentifiedinplan，hencetherandomaggregatestructuresaregenerated]hentheyareseparatedintothemesho

3、ffiniteelementsAfterthatdifferentmaterialpropertiesareassignedtotherespectiveelementsaccordingtoelementlocationsinindividualphases，atwo—dimensionalnumericalmodelforthecompositestructureofconcreteisformedAtlast，usingafini

4、teelementaryprogram———‘NLFEI，developedbyourowndePartment，thenumericalexperimentonconcretespecimencanbecarriedoutAtpresent，themajorityoftheresearchworkinthisfieldisfocusedonthenumericalsimulationofconcreteunderuniaxialstr

5、essHoweverthefracturemechanismofconcreteunderbiaxialstressisSOcomplicatedthatthereareonlyfewreportsaboutitInthetreatise，atthefirstplace，theprocessofcrackproPagationfortbreesizesofconcretespecimensunderuniaxialstresswassi

6、mulatedbynumericalanalysisAndthentheresultsofthenumericalexperimentwerecomParedwithofengineeringexperimentandtheParametersofDesignspecificationofconcretestructure))Thesizeeffectforspecimensunderuniaxialstresswasanalyzed，

7、InthesecondplacetheprocessoffractureforthosespecimensunderbiaxialstresswassimulatedandthebiaxialstrengthfordifferentsizespecimenswasstudiedAtlast，thefailureenvelopwasdrawnandcomParedwithKupferenvelopandtheenvelopin((Desi

8、gnspecificationofconcretestructureThepurposeofthistreatiseistoresearchthemechanicalcharacteristicsofconcretespecimensunderuniaxialstressandbiaxialstressbymeansofnumericalmethod，buildabridgebetweenmesoandmacromechanicsand