第53卷第3期2023年2月上建筑结构BuildingStructureVol.53No.3Feb.2023DOI:10.19701/j.jzjg.20211637第一作者:廖文彬,硕士,教授级高级工程师,主要从事工程结构设计工作,Email:744895349@qq.com。某钢结构工程整体坍塌原因技术分析廖文彬(福建省建筑设计研究院有限公司,福州350001)摘要:通过对某酒店钢结构工程整体坍塌事故案例开展调查与分析发现,其坍塌是由于加夹层改建后结构自重明显增加,导致节点区柱端在主轴平面内的压弯承载力不足,柱中出现塑性损伤,H型钢柱节点区受压翼缘局部屈曲引起失稳破坏;钢柱设计选型不合理是造成其失稳破坏的主因,且未设置柱间支撑,施工上钢梁与钢柱连接处上下翼缘未焊接或焊接质量差导致刚接变成铰接,从而造成结构成为排架结构或局部排架结构,结构整体稳定性差,其结构体系存在严重缺陷,最终钢柱失稳破坏引起结构整体瞬间坍塌。关键词:钢结构;夹层改建;坍塌;失稳;事故分析中图分类号:TU391文献标志码:A文章编号:1002-848X(2023)03-0092-05[引用本文]廖文彬.某钢结构工程整体坍塌原因技术分析[J].建筑结构,2023,53(3):92-96,86.LIAOWenbin.Technicalanalysisonoverallcollapsecauseofasteelstructureproject[J].BuildingStructure,2023,53(3):92-96,86.TechnicalanalysisonoverallcollapsecauseofasteelstructureprojectLIAOWenbin(FujianArchitecturalDesignandResearchInstituteCo.,Ltd.,Fuzhou350001,China)Abstract:Throughtheinvestigationandanalysisoftheoverallcollapseaccidentofasteelstructureprojectinahotel,itwasfoundthatthereasonforitscollapseisthattheself-weightofthestructureincreasedsignificantlyafterthereconstructionofmezzanine.Asaresult,theflexuralbearingcapacityofthecolumnendinthejointzonewasinsufficientinthespindleplane,plasticdamageappearedinthecolumn,andthelocalbucklingofthecompressionflangeinthejointzoneofH-shapedsteelcolumncausedinstabilityfailure.Theirrationaldesignandselectionofsteelcolumnshapewasthemaincauseofitsinstabilityfailure,andthebraceswerenotsetuptosupport.Intheconstruction,upperandlowerflangesofsteelbeamatitsconnectionjointwithsteelcolumnwerenotweldedorweldedinpoorweldingquality,changingrigidconnectionintohingedjoint.Thisresultedinthestructurebecomingaframe-bentstructureorpartialframe-bentstructurewithpooroveral...
