建筑施工·第44卷·第12期2815既有建筑基础托换过程中的结构响应分析时春霞何强潘峰上海建工五建集团有限公司上海200063摘要:在基础托换施工中,建筑基础会因竖向荷载重分布而相应发生沉降变化,上部结构基于此所做出的结构响应值得研究。以上海文保建筑华东医院南楼基础托换、整体顶升工程为背景,通过有限元分析方法,模拟分析各施工工况中的上部结构响应情况。对于同一工况,分别根据沉降监测数据和沉降数值模拟结果设定边界条件,并将有限元模型中梁、柱单元截面正应力在不同工况中的变化情况和实际监测所得的应力数据变化进行对比。结果表明:有限元模型可以在较大程度上反映各施工工况中的结构响应变化,据此可找出需重点监测的工况,以确保施工中结构安全。该方法为既有建筑基础托换施工中的结构响应分析提供了一种思路。关键词:基础托换;基础沉降;有限元分析;结构响应;监测数据中图分类号:TU746文献标志码:A文章编号:1004-1001(2022)12-2815-04DOI:10.14144/j.cnki.jzsg.2022.12.002StructuralResponseAnalysisofExistingBuildingsDuringUnderpinningSHIChunxiaHEQiangPANFengShanghaiConstructionNo.5(Group)Co.,Ltd.,Shanghai200063,ChinaAbstract:Inthefoundationunderpinningconstruction,thesettlementofthebuildingfoundationwillchangeduetotheverticalloaddistribution.Thestructuralresponseofthesuperstructurebasedonthisisworthstudying.BasedonthefoundationunderpinningandintegraljackingprojectoftheSouthBuildingofEastChinaHospital,aculturalrelicprotectionbuildinginShanghai,theresponseofsuperstructureundervariousconstructionconditionsissimulatedandanalyzedthroughfiniteelementanalysis.Forthesameworkingcondition,theboundaryconditionsaresetaccordingtothesettlementmonitoringdataandthesettlementnumericalsimulationresults,andthechangesofthenormalstressofthebeamandcolumnelementsectionsinthefiniteelementmodelindifferentworkingconditionsarecomparedwiththechangesofthestressdataobtainedfromtheactualmonitoring.Theresultsshowthatthefiniteelementmodelcanreflectthestructuralresponsechangesinvariousconstructionconditionstoalargeextent,andtheworkingconditionsthatneedtobemonitoredcanbefoundaccordinglytoensurethestructuralsafetyduringconstruction.Thismethodpr...