102IndustrialConstructionVol.53,No.4,2023工业建筑2023年第53卷第4期新型纤维改性混凝土装配式框架节点抗震性能分析∗杨晓华1张骞2吴森坤2冯健2蔡建国2(1.中国铁建投资集团有限公司,广东珠海519000;2.东南大学国家预应力工程技术研究中心,南京210096)摘要:为研究在节点核心区及键槽区等后浇区部分采用纤维改性混凝土对梁柱节点抗震性能的影响,基于此概念设计了改进的预制预应力装配式梁柱节点。以试件SJ1和SJ4为研究对象,系统分析梁柱节点设计参数对节点性能的影响,包括后浇区混凝土强度及延性、梁纵筋强度和后浇区箍筋间距。结果表明:后浇区混凝土受压延性的降低会加剧高配筋率节点试件强度退化及位移延性降低;提高梁纵筋强度等级可以显著提高装配式框架梁柱节点的承载能力,同时会降低其位移延性;增大后浇区的箍筋间距会降低节点试件的位移延性,并且高配筋率梁柱节点的抗震性能对后浇区箍筋间距的调整更敏感。关键词:预制预应力梁柱节点;纤维改性混凝土;抗震性能;参数分析;非线性有限元DOI:10.13204/j.gyjzG20122208SeismicPerformanceAnalysisofBeam-ColumnConnectionsofPrefabricatedFiberModifiedConcreteFramesYANGXiaohua1ZHANGQian2WUSenkun2FENGJian2CAIJianguo2(1.ChinaRailwayConstructionInvestmentGroupCorporationLimited,Zhuhai519000,China;2.NationalPrestressEngineeringResearchCenter,SoutheastUniversity,Nanjing210096,China)Abstract:Theinfluenceofconcretereinforcedwithfibersinthepost-castregion,includingtheconnectionregionandbeamserviceholes,wasstudied.Animprovedprecastprestressedbeam-columnconnectionwasdesignedbyusingfibermodifiedconcreteintheconnectionarea.ForspecimenSJ1andSJ4,theinfluenceofdesignparametersonthemechanicalpropertiesofconnectionswasinvestigatedsystematically,whichincludingtheductilityandstrengthofconcreteinthepost-castregion,beamlongitudinalrebarstrength,andstirrupspacinginthepost-castregion.Theresultsshowedthatthereductionofcompressiveductilityofpost-castconcretehadamoreobviouspromotingeffectontheaccelerateddegradationoftheconnectionstrengthandthereductionofdisplacementductilityofconnectionswithahighreinforcementratio.Byincreasingthestrengthgradeofbeamlongitudinalrebars,thebearingcapacityofconnectionswouldbeimprovedsignifican...
