Jun.20232023年6月StructuralEngineersVol.39,No.3第39卷第3期师程构结CFRP补强含表面裂纹钢板受拉疲劳试验研究李筑轩1，2陈涛1，2，*（1.同济大学工程结构性能演化与控制教育部重点实验室，上海200092；2.同济大学建筑工程系，上海200092）摘要对碳纤维增强复合材料（CFRP)补强含表面裂纹钢板进行系列试验，主要研究了表面裂纹深度、长度和CFRP单双面补强对疲劳寿命和裂纹扩展的影响，分析补强前后裂纹深度方向扩展速率的规律以及相关应变变化规律。试验研究结果表明，裂纹深度增加会显著降低疲劳寿命,CFRP补强可在一定程度上提高疲劳寿命并减缓裂纹扩展，最高可提升疲劳寿命至未补强试件的两倍。对于含表面裂纹钢板试件而言，双面CFRP补强效果与单面补强效果近似，两者相差不大关键词表面裂纹，CFRP，疲劳试验，疲劳寿命FatigueTensionTestsonCFRPReinforcedSteelPlateswithSurfaceCracksLIZhuxuan'l:2CHENTaol.2.*(1.KeyLaboratoryofPerformanceEvolutionandControlforEngineeringStructures(MinistryofEducation),TongjiUniversity,Shanghai200092,China;2.DepartmentofStructuralEngineering,TongjiUniversity,Shanghai200092,China)AbstractAseriesoftestswerecarriedoutoncarbonfiberreinforcedplastics(CFRP)reinforcedsteelplateswithsurfacecracks.Thensomefactorsaffectingthefatiguelifeandcrackpropagationwerestudied.ThesefactorsincludedthedimensionsofsurfacecracksandtheCFRPreinforcement.Inaddition,thestrainhistoryandthecrackpropagationratesindepthdirectionbeforeandafterreinforcementwereanalyzed.Theresearchresultsshowthattheincreaseofthecrackdepthwillsignificantlyreducethefatiguelife.Furthermore,theCFRPreinforcementcanimprovethefatiguelifeandslowdownthecrackpropagationtoacertainextent.Itcanincreasefatiguelifeuptotwicethatofunreinforcedspecimens.Forthesteelplateswithsurfacecracks,thedouble-sidedCFRPreinforcementissimilartothatofsingle-sidedreinforcement.Keywordssurfacecrack,CFRP,fatigueexperiment,fatiguelife0引言钢材在国家经济繁荣，社会福补和生活质量方面发挥着关键作用。而疲劳荷载是造成钢结构失效的一个常见原因[2]。即使钢材所受应力远低于屈服强度，由于多次循环荷载作用，也可能会发生结构疲劳损伤。由于疲劳破坏是脆性破坏，没有明显的宏观塑性变形，且破坏时荷载水...
