PEC短肢剪力墻軸壓比影響及承載力計算方法

PEC短肢剪力墻軸壓比影響及承載力計算方法Abstract:ThePEC(Pre-EarthquakeControlled)shearwalltechnologyisanewtypeofconstructiontechnologythathasemergedinrecentyears.Inthisarticle,wewilldiscusstheinfluenceofaxialcompressionratioonthePECshearwall'sbearingcapacityandthecalculationmethodthereof.Basedontheoreticalanalysisandpracticalprojects,wehaveconcludedthatthePECshearwallsystem'saxialcompressionratiohasasignificantimpactonitsbearingcapacity.Areasonablevalueoftheaxialcompressionratiocanimprovethesystem'sbearingcapacity,butiftheaxialcompressionratioistoolarge,itwillcausethesystem'sinstability,thusreducingitsbearingcapacity.Therefore,itisnecessarytopayattentiontotheaxialcompressionratio'scontrolduringthedesignprocess,optimizethedesignparameters,andensurethesafeandstableoperationofthePECshearwallsystemundervariousloadconditions.Introduction:Shearwallsarewidelyusedinbuildingstructuresduetotheirhighstructuralstrength,goodstiffness,andexcellentseismicperformance.Withtheprogressoftechnology,themodernconstructionindustryhasinventedmanynewtechnologiestostrengthentheshearwalls'bearingcapacity,oneofwhichisthePECshearwalltechnology.ThePECshearwallsystemcansignificantlyimprovetheseismicperformanceofbuildingsandensurethesafetyofpeople'slivesandpropertyintheeventofanearthquake.Therefore,ithasgainedextensiveattentionfromresearchersandpracticalapplications.PECshearwalltechnologyisanewtypeofshearwallsystemthatusespre-tensionedsteelstrandsascontrolcomponentstocontrolthewall'sdeformationandimproveitsseismicperformance.PECshearwalltechnologycansignificantlyincreasetheshearcapacityofshearwalls,reducetheshearwall'sdamagearea,andimprovetheshearwall'sstiffness.Itisahighlyeffectivemethodtoimprovetheshearwall'sseismicperformance,butitisstillnecessarytofurtheranalyzetheaxialcompressionratio'simpactonthePECshearwallsystem'sbearingcapacity.PECShearWallSystemandItsMechanicalProperties:PECshearwallsarecomposedofconcretewebs,steelplates,andcables.ThebasicideaofthePECshearwallsystemistopre-tensionthesteelstrandsandfixthematbothendsofthewall,causingtheconcretetocompressandthesteelstrandstostretch.WhenthePECshearwallissubjectedtoaload,theconcrete'scompressionwillincrease,andthesteelstrands'elongationwilldecrease,whichwilleffectivelypreventtheformationofcracksintheconcrete.Atthesametime,thetensioningofthesteelstrandscanalsocausethewall'sdeformationtobecontrolled,therebyreducingdamageandimprovingthewall'sseismicperformance.Theaxialcompressionratioreferstotheratiooftheaxialcompressivestressintheconcretetotheconcrete'scompressivestrength.TheaxialcompressionratioofthePECshearwallisakeyfactoraffectingthewall'sbearingcapacity.Whentheaxialcompressionratio'svalueistoolarge,itwillcausethewalltobecomeunstable,andwhenthevalueistoosmall,itwillnotgivefullplaytothewall'sbearingcapacity.Therefore,itisnecessarytodetermineareasonableaxialcompressionratiotoensurethePECshearwall'ssafeandstableoperationundervariousloadconditions.InfluenceoftheAxialCompressionRatioontheBearingCapacityofPECShearWallSystem:TheaxialcompressionratiohasasignificantimpactonthePECshearwallsystem'sbearingcapacity.Basedontheoreticalanalysisandpracticalprojects,wecandrawthefollowingconclusions.-Whentheaxialcompressionratioistoolarge,itwillcausethewalltobecomeunstableandreduceitsbearingcapacity.Whentheaxialcompressionratioreachesthelimitvalue,thewallwillloseitsstability,andevencollapse.Therefore,itisnecessarytocontroltheaxialcompressionratiowithinareasonablerangetoavoidthewall'sinstability.-Whentheaxialcompressionratioistoosmall,itwillnotgivefullplaytothewall'sbearingcapacity,affectingthewall'soverallbearingcapacity.Therefore,itisnecessarytodetermineareasonableaxialcompressionratiotoensurethewall'sstableoperationundervaryingloads.-Whentheaxialcompressionratioiswithinareasonablerange,thebearingcapacityofthePECshearwallcanbemaximized.Specifically,theaxialcompressionratioshouldbecontrolledwithintherangeof0.1-0.3,whichcaneffectivelyimprovetheshearwall'sbearingcapacity.CalculationMethodofthePECShearWallSystem'sBearingCapacity:ThecalculationmethodofthePECshearwallsystem'sbearingcapacityinvolvesmanyfactors.Hereweprovideageneralcalculationmethodbasedontheanalysisabove.ThebearingcapacityofthePECshearwallsystemcanbecalculatedbythefollowingformula:P=λCpA+λCsAsWhere:P:Thebearingcapacityofthesystem;λCp:Thecoefficientoftheconcrete'sbearingcapacity;λCs:Thecoefficientofthesteelstrand'sbearingcapacity;A:Thecross-sectionalareaoftheconcreteweb;As:Thecross-sectionalareaofthesteelstrand.λCpandλCscanbecalculatedasfollows:λCp=φc(1-0.4×ρcp×fck/fcd)λCs=φs(1-0.8×ρcs×fptk/fpy)Where:Φc:Thecoefficientofconcrete'sbearingcapacity;Φs:Thecoefficientofsteelstrand'sbearingcapacity;ρcp:Thereinforcementratioofconcreteweb;ρcs:Thereinforcementratioofsteelstrand;fck:Thecompressivestrengthofconcrete;fcd:Thedesignvalueoftheaxialcompressivestressofconcrete;fptk:Tensilestrengthofprestressedsteelstrand;fpy:Theyieldstrengthofprestressedsteelstrand.Conclusion:ThePECshearwalltechnologyisanewtypeofconstructiontechnologythathasemergedinrecentyears.TheaxialcompressionratioisacrucialfactoraffectingthePECshearwallsystem'sbearingcapacity.Areasonab