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1、重庆大学硕士学位论文裂缝；采用不同的柱角处楼板构造方案其裂缝控制效果不同；相比而言，在柱角处配置正交钢筋并加上托板可有效地控制大截面柱框架结构楼板裂缝。关键词：裂缝，楼板，主拉应力，大截面柱，构造措施II英文摘要ABSTRACTCast-in-situReinforcedconcreteslabcrackshavebeenattractingtheattentionofresearchersathomeandabroad,andtheyhavegreatinfluenceonthedurabilityandapplicabilityofstructur
2、es.Nowadays,duetothelackofland,high-risebuildingsandsuperhigh-risebuildingsareconstructedmoreextensively.Withtheincreaseofthetotalnumberoffloors,columncrosssectionsoflowerfloorsarerelativelylarge,beamcrosssectionsbasicallyremainunchanged,whichmakesthecorrespondingslabsbecomespec
3、ial-shapedplates.However,designersstillusetraditionaldesignmethods,i.e.,one-wayslabortwo-wayslab,andcorrespondingdetailingmeasures,ignoringspecialmechanicalbehaviorsofspecial-shapedplates,especiallytheirparticularityofstressdistribution,whichleadstocracks.Withthisinmind,mechanic
4、albehaviorsofslabsunderverticalloadactionandtemperatureeffectarestudiedbyconsideringvaryingcolumnsection.ThestudyisbasedontheoryanalysisandnumericalsimulationsusingANSYSProgramandisintermsofprincipletensilestress,deflection,bendingmoment,yieldlineandcracks.Themotivationofthestud
5、yistooffersomereferencetoreinforcementdesignanddetailmeasuresoffloorslabsinstructuresoflargecross-sectioncolumn.Themaincontentsandachievementsareasfollows:①Thevariationrulesoftensilestressandshearstressofslabsunderverticalloadsarestudiedwithvaryingcolumnsection.Theresultsrevealt
6、hat:toptensilestressaroundcolumncornerandtopshearstressalongslab-columninterfaceincreasewiththeincreaseofcolumnsection;auxiliaryreinforcementisrequiredatthoseregionswhendesignslabsoflargecolumnsections.②Thevariationrulesofdeflectionandbendingmomentofslabsunderverticalloadsarestu
7、diedwithvaryingcolumnsection,resultingzero-momentlinesofslabsofdifferentcolumnsections.Theresultsrevealthat:slabbendingmomentaroundcolumncornerincreasesandzero-momentlineshrinksconsiderably,withtheincreaseofcolumnsection;lengthofnegative-momentbardesignedafterthetwo-wayslabmetho
8、ddoesnotcoverthenegativemomentzone,andtherefore
