应变率效应对钢筋混凝土构件力学特性的影响

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1、大连理工大学硕士学位论文应变率效应对钢筋混凝土构件力学特性的影响姓名：许东申请学位级别：硕士专业：防灾减灾及防护工程指导教师：肖诗云20090601大连理工大学硕士学位论文InfluenceofStrainRatesonMechanicalBehaviorsofReinforcedConcreteMembersAbstractConcretestructuresaresubjectedtodynamiclcadsunavoidably，forexample，seismiclcad,blastlcad．impactlcad．

2、Becausetherearedistinctdifferencesbetweendynamicsituationsandstaticsituationsaboutthebehaviorsandstress．strainrelationshipsofconcreteandsteelmaterials，reinforeedconcretestructuresormembersshowdifferentbehaviorssubjectedtothedynamicloadingfromthestaticloading．Concr

3、eteisakindofratedependentmaterialandworksinhi曲strainlevelwhensubjectedtotheseismicloadorblast10ad．Thestress-strainrelationshipgivenbydesigncodeofreinforcedconcrete。whichisdirectlyusedtoanalyzethebehaviorofconcretestructures，Callnotshowtheeffectofstrainratebecausei

4、nthecodetheeffectofstrainrateiSnottakenintoaccount．Inthispaper，accordingtothedynamicexperimentalresultsofconcrete，thesla'ess．strainrelationshipofconcretegivenbydesigncodeofreinforcedconcreteismodifiedbytakingaccountintotheeffectofstrainrateonconcrete．Thendynamicbe

5、haviorsofreinforcedconcretemembersarestudiedwiththemodifiedmodel．(1)BasedOncontinuumdamagetheoryanddamagevariabledefinedbytangentdegradationofconcrete，theevolutionofdamageofconcreteunderdifferentstressratesisdeduced．，nleevolutionofdamageshowsthatthedamagevalueincr

6、easeswiththeincreasedstrainratioatthesamestrainratio，thedamagevaluedecreaseswiththeincreasedstrainstrain．(2)Basedonthelayerfibermodel，crackingmoment,crackingcurvaturelimitmomentandlimitcurvatureofreinforcedconcretebeamarestudied．Atthesametime，thetendencyofthefouri

7、ndexesabove、撕mthereinforcementratioisalsostudied．Duringthestudying，twosituationsareconsidered，①onlydynamiccharacteristicsofconcreteareconsidered②dynamiccharacteristicsofconcreteandsteelareconsidered．nleresultshowsthatdynamiccharacteristicsofconcretehaslittleeffect

8、onthecrackingmoment、crackingcurvature、limitmomentandlimitcurvatureofmoderatereinforeedbeambutdynamiccharacteristicsofsteelhasconsiderableeffectonthefour