2022·12·BuildingConstruction2826既有建筑托换顶升施工中的构件承载性能分析何强上海建工五建集团有限公司上海200063摘要：既有建筑托换顶升施工过程中，构件的承载性能受施工影响可能发生变化，需对关键结构部位的构件承载性能进行分析，以确保结构安全。以上海文保建筑华东医院南楼托换顶升工程为例，采用数值模拟分析方法，利用ANSYS有限元软件建立钢筋混凝土分离式模型，验证了基础大放脚上开施工洞口的影响，分析了用于托换顶升的双夹梁叠合构件的承载性能和传力机制。结果表明：基础大放脚上开施工洞口对安全性影响较小；深受弯叠合构件的传力机制符合拉-压杆模型，其位于受荷与支承处连线范围内的区域有着较大的主压应力和剪应力；托换顶升施工中承受上部柱荷载的双夹梁构件满足安全要求。研究结论为钢筋混凝土局部构件的精细化分析提供了参考依据。关键词：基础托换；承载特性；数值模拟；结构分析中图分类号：TU746文献标志码：A文章编号：1004-1001(2022)12-2826-04DOI：10.14144/j.cnki.jzsg.2022.12.005AnalysisofBearingCapacityofComponentsinUnderpinningandJackingConstructionofExistingBuildingsHEQiangShanghaiConstructionNo.5(Group)Co.,Ltd.,Shanghai200063,ChinaAbstract:Duringtheunderpinningandjackingconstructionofexistingbuildings,thebearingcapacityofcomponentsmaychangeduetotheimpactofconstruction.Itisnecessarytoanalyzethebearingcapacityofcomponentsatkeystructuralpartstoensurestructuralsafety.TakingtheunderpinningandjackingprojectoftheSouthBuildingofEastChinaHospital,aculturalrelicprotectionbuildinginShanghai,asanexample,usingthenumericalsimulationanalysismethodandthefiniteelementsoftwareANSYS,aseparatereinforcedconcretemodelisestablishedtoverifytheinfluenceoftheconstructionopeningonthelargefootingofthefoundation,andthebearingcapacityandloadtransfermechanismofthedoubleclampedbeamcompositememberusedforunderpinningandjackingareanalyzed.Theresultsshowthattheconstructionopeningonthelargefootingofthefoundationhaslittleinfluenceonthesafety;Theforcetransfermechanismofdeepbendingcompositemembersisinaccordancewiththestrutandtiemodel,andtherearelargeprincipalcompressivestressandshearstressintheareawithinthelinebetweentheloadandthesuppo...
