锈蚀钢筋混凝土梁抗弯承载力计算方法

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1、2011年第8期(总第262期)混凝土理论研究Number8in2Ol1(TotalNo．262)ConcreteTHEORETICALRESEARCHdoi：10．3969~．issn．1002—3550．2011．08．004锈蚀钢筋混凝土梁抗弯承载力计算方法吴庆。庄悦(江苏科技大学土木工程与建筑学院，江苏镇江212003)摘要：基于锈蚀钢筋混凝土梁内钢筋与混凝土间黏结强度随锈蚀量的变化，对锈蚀梁的抗弯承载力进行了研究。当钢筋锈蚀量较小时，锈蚀梁内钢筋与混凝土间黏结强度随锈蚀量变化不大，锈蚀梁的力学性能同未锈蚀

2、梁，可运用传统的梁理论计算锈蚀梁的抗弯承载力；但随着钢筋锈蚀量的增加，钢筋与混凝土间黏结强度发生退化，锈蚀梁的力学性能介于黏结完好梁与无黏结梁之间，与传统的计算梁的抗弯承载力的方法不同，应考虑梁的各截面间相互作用。基于梁整体的受力平衡和变形协调，提出概念明确、通用性强的锈蚀钢筋混凝土梁抗弯承载力计算方法；经试验验证，数据吻合很好，其结果有益于完善和发展锈蚀钢筋混凝土梁抗弯承载力的计算方法。关键词：锈蚀钢筋混凝土梁；锈蚀程度；抗弯承载力；退化机理中图分类号：TU528．叭文献标志码：A文章编号：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算理论为前提，都没有很好解决由于黏结性能退化而引起的锈0引言蚀钢筋