結(jié)構(gòu)鋼斷裂破壞面理論及試驗研究.pdf

1、蘭州理工大學碩士學位論文結(jié)構(gòu)鋼斷裂破壞面理論及試驗研究姓名：張建軍申請學位級別：碩士專業(yè)：結(jié)構(gòu)工程指導教師：王萬禎20080501結(jié)構(gòu)鋼晰裂破壞面理論及試驗研究AbstractAsanimportantprobleminmanyindustries，crackplayaVitalroleinbearingcapacityandoperationallifespanofstmcturalmembers，andthefiledofsteel

2、structureisnotexceptiontooInthe1994NorthridgeearthquakeinAmericaand1995Hyogoken—NanbuearthquakeinJapan，thereweregreatmanybrittlefailures0fbeam—to—columnconnections，whichindicatedthatcognitionsofpeopleonthestl。essbehaVior

3、anddamagemechanismofstructuralsteelwereratherinadequateInordertoaVoidthepersonnelcasualtyandthepropertydamage，theUnitedStatesandJapansetupspecia“zedresearchinstitutionsandproposedalotofmodifiedprogramsButtheseprogramswhe

4、therwithenoughefkctiVenessonlyafteranotherlargeearthquakewecanknowtheresultAtpresent，manyresearchesareconcentratedonbeamto—columnconnections，theywanttosolVetheproblemsthroughimproVethemodesofbeam—tocolumnconnectionButthe

5、reareonlyafewresearchesaboutstl7ucturalsteelf|acturemechanismonmechanicsSo，wewillseekthecrackcriterionofstructuralsteelfromthiswayThisarticleproposedanewfracturecriteriononthebasisofmetalstrengththeory，fracturemechanics，

6、damagemechanics，materialsscienceandsoon，whichhadrotaryparaboloidinthescopeof仃肼OAtthesametime，inordertoex鋤inethefracturecriterionthisarticledidfracturetestsofstmcturalsteelandthendidthenumericalsimulationabouttheseexperim

7、entsThroughthesimulatedresultsofstructuralsteelspecimensweknowthatthefracturecriterionhassuitablemodeandenoughprecisionBecauseinthepastthereweremanyexpe“mentssupportedMises’criterion，thisarticlewillstilluseitinthescopeof

8、口冊≤0OnthepureshearplanethenewfracturecriterionofthisarticleandlⅥises’criterionintegratedtogetherInthreedimensiOnalstressspace，spatialmodel0fthisnewfracturecrite“onlikeabulletwhichhassmoothappearanceandmathematicaltractab

9、ilityInordertousethisnewfracturecriterioninthetheoryresearchandpr00ects，thisarticledetaileddescribedthefracturedesignofitResearchcontentsofthisarticleareVerynew，andtheresearchwayentirelydisengageitselffomtherestraintofex