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1、第28卷增刊IVol.28Sup.I工程力学2011年6月June2011ENGINEERINGMECHANICS60文章编号：1000-4750(2011)Sup.I-0060-04箍筋锈蚀钢筋混凝土梁的抗剪承载力分析*1,21,21,21,2李士彬，张鑫，贾留东，王欣(1.山东建筑大学土木工程学院，济南250101；2.山东省建筑结构鉴定加固与改造重点实验室，济南250101)摘要：为研究箍筋锈蚀钢筋混凝土梁抗剪性能退化规律，在考虑质量损失影响的基础上，对48根混凝土中自然锈蚀光圆钢筋试件进行轴向拉伸试验。结果表明：钢筋试件大多断面整齐，基本无颈缩现象，表现为脆性破坏；随着质量损失的增大，
2、钢筋的屈服平台缩短甚至消失，极限变形显著减小。经回归分析，建立了自然锈蚀光圆钢筋的强度退化模型。考虑钢筋锈蚀对箍筋截面面积和力学性能及混凝土截面的影响，基于《混凝土结构设计规范》(GB50010-2002)以剪压破坏的受力特征为基础建立的混凝土梁抗剪承载力计算公式，提出了箍筋锈蚀钢筋混凝土梁的抗剪承载力估算公式。并且，对所提出的箍筋锈蚀钢筋混凝土梁的抗剪承载力的理论预测进行了试验验证。计算结果与试验结果吻合较好，且偏于安全。关键词：钢筋混凝土梁；箍筋锈蚀；试验；抗剪承载力；评估公式中图分类号：TU375.1文献标识码：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
