20第49卷第4期2023年8月四川建筑科学研究SichuanBuildingScience火灾后装配式钢筋混凝土梁疲劳性能试验研究秦海亮，傅传国，王运兴，匡华硕，许腾飞（山东建筑大学土木工程学院，山东济南250101）摘要：火灾后装配式钢筋混凝土结构的疲劳性能研究具有重要理论研究和实践意义，为模拟钢筋混凝土梁装配式连接节点的性能，设计了4根足尺装配式钢筋混凝土简支梁试件。通过火灾升降温作用及循环荷载加载试验，观察分析了装配式钢筋混凝土梁经历火灾升温作用后的抗疲劳性能劣化规律以及装配后浇部位的整体工作性能。火灾后的疲劳性能试验结果表明：后浇连接部位没有出现明显的异常破坏现象，装配连接的整体工作性能良好；火灾升温作用时间对装配式钢筋混凝土梁的疲劳寿命有明显不利影响，与常温对比试验梁相比，经历火灾升温作用60、120min后的装配式钢筋混凝土梁的疲劳寿命分别缩短了41.27％、97.63％。关键词：火灾后；装配式钢筋混凝土梁；疲劳性能；疲劳寿命DOI：10.19794／j.cnki.1008-1933.2023.0042中图分类号：TU366.3文献标志码：A文章编号：1008-1933（2023）04-0020-10ExperimentalstudyonfatiguebehaviorofprefabricatedreinforcedconcretebeamsafterfireQINHailiang，FUChuanguo，WANGYunxing，KUANGHuashuo，XUTengfei（SchoolofCivilEngineering，ShandongJianzhuUniversity，Jinan250101，China）Abstract：Theresearchonfatigueresistanceofprefabricatedreinforcedconcretestructuresafterfirehasimportanttheoreticalandpracticalsignificance.Inordertosimulatetheperformanceofprefabricatedreinforcedconcretebeamjoints，fourfull-scaleprefabricatedreinforcedconcretesimplebeamspecimensweredesigned.Throughthefiretemperatureriseandfallactionandcyclicloadtest，thedeteriorationruleoffatigueresistanceofprefabricatedreinforcedconcretebeamssubjectedtofireandhightemperatureactionandtheoverallworkingperformanceoftheassembledpostcastpartswereobservedandanalyzed.Theresultsoffatiguebehaviortestafterfireshowthatthereisnoobviousabnormaldamageinthepostcastjoint，andtheoverallworkingperformanceoftheassemblyconnectionisgood.Thefireactiontimehasasignificantadverseeffectonthefatiguelifeoftheprefabricatedreinforcedconcretebeam.Comparedwiththenormaltemperaturecontrastspecimen，thefatigueli...
