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1、2011年第8期(總第262期)混凝土理論研究Number8in2Ol1(TotalNo.262)ConcreteTHEORETICALRESEARCHdoi:10.3969~.issn.1002—3550.2011.08.004銹蝕鋼筋混凝土梁抗彎承載力計算方法吳慶。莊悅(江蘇科技大學(xué)土木工程與建筑學(xué)院,江蘇鎮(zhèn)江212003)摘要:基于銹蝕鋼筋混凝土梁內(nèi)鋼筋與混凝土間黏結(jié)強(qiáng)度隨銹蝕量的變化,對銹蝕梁的抗彎承載力進(jìn)行了研究。當(dāng)鋼筋銹蝕量較小時,銹蝕梁內(nèi)鋼筋與混凝土間黏結(jié)強(qiáng)度隨銹蝕量變化不大,銹蝕梁的力學(xué)性能同未銹蝕
2、梁,可運用傳統(tǒng)的梁理論計算銹蝕梁的抗彎承載力;但隨著鋼筋銹蝕量的增加,鋼筋與混凝土間黏結(jié)強(qiáng)度發(fā)生退化,銹蝕梁的力學(xué)性能介于黏結(jié)完好梁與無黏結(jié)梁之間,與傳統(tǒng)的計算梁的抗彎承載力的方法不同,應(yīng)考慮梁的各截面間相互作用?;诹赫w的受力平衡和變形協(xié)調(diào),提出概念明確、通用性強(qiáng)的銹蝕鋼筋混凝土梁抗彎承載力計算方法;經(jīng)試驗驗證,數(shù)據(jù)吻合很好,其結(jié)果有益于完善和發(fā)展銹蝕鋼筋混凝土梁抗彎承載力的計算方法。關(guān)鍵詞:銹蝕鋼筋混凝土梁;銹蝕程度;抗彎承載力;退化機(jī)理中圖分類號:TU528.叭文獻(xiàn)標(biāo)志碼:A文章編號:l002—3550(2
3、011)08—0010—05CalculationmethodforflexuralcapacityofcorrodedRCbeamsreinforcedconcretebeamswUOing.ZHUANGYue(CollegeofCivilEngineeringandArchitecture,JiangsuUniversityofScienceandTechnology,Zhenjiang212003,China)Abstract:Flexuralcarryingcapacityofcorrodedreinfor
4、cedconcretebeamsismodeledandcalculatedonthebasisofthechangeofbondstrengthbetweencorodedsteelandconcrete.Atlowerdegreesofcorrosionlevel,bondstrenIgthbetweensteelandconcretedoesn’thavegreatchangeswithincreasingdegreesofcorrosion,themechanica1behaviorofthecoroded
5、RCbeamsiSthesameasthatofthenon-corodedones,flexuralcarryingcapacityofcorodedRCbeamscanbecalculatedbyconventionaltheoryofthebeam.Whenreductionofbondstrengthoccursduetohigherdegreesofcorosion,themechanicalbehaviorofthecorrodedRCbeamsliesinbetweenthatoftheperfect
6、lybondedandunbondedbeam.ItisdifferentfromthetraditionalwayinRCbeams.theinteractionbetweencrosssectionsofbeamsshouldbeconsidered.Inthepresentpa—per,thechangeofbondstrengthbetweencorodedsteelandconcreteisconsidered,andonthebasisoftheconditionofequilibriumofforce
7、sandcompatibilityofdeformationsforwholebeams,acalculationmethodforflexuralcapacity,conceptuallyexplicitandwidelyapplicable,waspro—posed,takingconsiderationofbothcorosiondegreeandreinforcementindex.Theresultswereusefultoperfectthecalculationmethodoftheflex—ural
8、bearingcapacityofcorodedreinforcedconcretebeams.Keywords:corodedreinforcedconcretebeam;corodeddegree;flexuralbearingcapacity;deteriorationmechanism算理論為前提,都沒有很好解決由于黏結(jié)性能退化而引起的銹0引言蝕鋼筋