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1、第28卷增刊IVol.28Sup.I工程力學(xué)2011年6月June2011ENGINEERINGMECHANICS60文章編號：1000-4750(2011)Sup.I-0060-04箍筋銹蝕鋼筋混凝土梁的抗剪承載力分析*1,21,21,21,2李士彬，張鑫，賈留東，王欣(1.山東建筑大學(xué)土木工程學(xué)院，濟(jì)南250101；2.山東省建筑結(jié)構(gòu)鑒定加固與改造重點實驗室，濟(jì)南250101)摘要：為研究箍筋銹蝕鋼筋混凝土梁抗剪性能退化規(guī)律，在考慮質(zhì)量損失影響的基礎(chǔ)上，對48根混凝土中自然銹蝕光圓鋼筋試件進(jìn)行軸向拉伸試驗。結(jié)果表明：鋼筋試件大多斷面整齊，基本無頸縮現(xiàn)象，表現(xiàn)為脆性破壞；隨著質(zhì)量損失的增大，
2、鋼筋的屈服平臺縮短甚至消失，極限變形顯著減小。經(jīng)回歸分析，建立了自然銹蝕光圓鋼筋的強(qiáng)度退化模型?？紤]鋼筋銹蝕對箍筋截面面積和力學(xué)性能及混凝土截面的影響，基于《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB50010-2002)以剪壓破壞的受力特征為基礎(chǔ)建立的混凝土梁抗剪承載力計算公式，提出了箍筋銹蝕鋼筋混凝土梁的抗剪承載力估算公式。并且，對所提出的箍筋銹蝕鋼筋混凝土梁的抗剪承載力的理論預(yù)測進(jìn)行了試驗驗證。計算結(jié)果與試驗結(jié)果吻合較好，且偏于安全。關(guān)鍵詞：鋼筋混凝土梁；箍筋銹蝕；試驗；抗剪承載力；評估公式中圖分類號：TU375.1文獻(xiàn)標(biāo)識碼：AANALYSISFORSHEARCAPACITYOFREINFORCEDC
3、ONCRETEBEAMSWITHCORROSIONSTIRRUPS*1,21,21,21,2LIShi-bin,ZHANGXin,JIALiu-dong,WANGXin(1.SchoolofCivilEngineering,ShandongJianzhuUniversity,Jinan250101,China;2.ShandongProvincialKeyLaboratoryofAppraisalandRetrofittinginBuildingStructures,Jinan250101,China)Abstract:Inordertostudytheshearcapacitydegener
4、ationofreinforcedconcrete(RC)beamswithcorrosionstirrups,consideringthemasslossofthestirrupreinforcement,axialtensiletestswereconductedon48naturallycarbonation-inducedcorrosionplainsteelbarsembeddedinroofconcretebeams.Thetestingresultsindicatethatthefracturesectionofcorrosionsteelbarsisevenwithoutnec
5、kingbasically,andpossessesadistinctbrittlefracturecharacter;alsotheyieldpointelongationofspecimenshortensevendisappears,andthelimitdeformationofspecimensdiminishesobviouslywiththeincreaseofmassloss.Bytheregressionanalysis,astrengthdegenerationmodelofnaturallycorrosionplainsteelbarsisbuilt.Considerin
6、gtheinfluenceofsteelbarcorrosionontheircross-sectionandmechanicalproperties,aswellasthereductionoftheeffectivesectionareaoftheconcrete,ashearingcapacityassessmentformulaofRCbeamswithcorrosionstirrupsisproposedbasedontheshearcapacityformulagivenbytheactualChinesecodeforthedesignofconcretestructures(G
7、B50010-2002).Finally,theproposedshearcapacitiesofRCbeamswithcorrosionstirrupsarecomparedwiththecorrespondingtestresults.Thecalculatedresultsareshowntobeinreasonableagreementswithtestones.Keywords:rein
