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ID:34227334
大小:2.22 MB
页数:88页
时间:2019-03-04
《局部锈蚀钢筋混凝土梁抗弯承载力的分析的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、上海交通大学硕士学位论文局部锈蚀钢筋混凝土梁抗弯承载力的分析研究姓名:陈晓晨申请学位级别:硕士专业:结构工程指导教师:刘西拉20070301局部锈蚀钢筋混凝土梁抗弯承载力的分析研究摘要钢筋锈蚀是影响混凝土结构耐久性的重要因素之一。锈蚀引起构件性能退化主要表现为材料的截面损伤、力学性能下降以及钢筋和混凝土间粘结力的退化,其中,如何考虑粘结退化,特别是局部粘结力退化对构件承载力的影响,现在是未能解决的难题。为研究粘结退化的影响,本文设计了一组局部无粘结梁的承载力试验,研究了不同配筋率、不同无粘结长度时梁的受力性能;通过对试验结果的分析,文
2、中引入了梯形累积变形区域的概念,提出了局部无粘结梁抗弯承载力的计算方法;在此基础上,综合考虑钢筋锈蚀对构件承载力的影响,本文建立了局部锈蚀钢筋混凝土梁抗弯承载力的计算模型,并利用一些试验结果对模型进行了验证;根据理论分析结果,文末给出了局部锈蚀钢筋混凝土梁承载力试验的设计建议。关键词:钢筋混凝土梁,粘结退化,局部锈蚀,局部无粘结,抗弯性能,承载力STUDYONTHEBENDINGCAPACITYOFLOCALIZEDCORRODEDREINFORCEDCONCRETEBEAMSABSTRACTCorrosionofreinforcem
3、entbarisoneofimportantfactorsthataffectsthedurabilityofconcretestructures.Theinfluenceontheperformanceofstructuralmembersduetocorrosionmainlyindamageofcrosssectionsandreductionofmechanicalproperties,aswellasbonddeteriorationbetweenreinforcementbarandconcrete.Howtoconsid
4、ertheeffectofbonddeterioration,especiallyforlocalizedcorrosion,isremainunsolved.Inordertostudytheinfluenceoflocalizedbonddeterioration,agroupofspecimensonlocalizedunbondedbeamswascarriedout,andthebearingbehaviorofbeamsunderdifferentreinforcedratiosandunbondedlengthswass
5、hown.Byanalysisoftheexperimentaldata,theconceptoftrapezoidalaccumulateddeformationzonewasintroducedtoconsidertheeffectoflocalbondloss.Basedontheresearchresults,acomputationalmodelwasprovidedtoevaluatethebearingcapacityoflocalizedcorrodedbeams.Someotherexperimentalresult
6、swereusedtoverifymodel.Accordingtotheoreticalanalysis,somesuggestionswerealsogivenforfurtherexperimentalresearchoflocalizedcorrodedbeams.KEYWORDS:ReinforcedConcreteBeam,BondDeterioration,LocalizedCorrosion,LocalizedUnbonded,FlexuralBehavior,BearingCapacity图片目录[7]图1-1影响混
7、凝土结构耐久性的因素·········································································4[8]图1-2混凝土结构耐久性的研究内容·········································································4[7]图1-3混凝土结构性能退化过程示意图·····································································6图
8、1-4钢筋锈蚀对钢筋混凝土构件性能的影响途径····················································7图2-1局部无粘结梁的截面尺寸及配筋·················
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