混凝土單雙軸力學(xué)性能的細(xì)觀數(shù)值模擬.pdf

1、北京工業(yè)大學(xué)碩士學(xué)位論文混凝土單雙軸力學(xué)性能的細(xì)觀數(shù)值模擬姓名：張超申請學(xué)位級別：碩士專業(yè)：水工結(jié)構(gòu)工程指導(dǎo)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