某钢结构工程整体坍塌原因技术分析
引用文献：
廖文彬. 某钢结构工程整体坍塌原因技术分析[J]. 建筑结构，2023，48（03）：92-96，86.
LIAO Wenbin. Technical analysis on overall collapse cause of a steel structure project[J]. Building Structure，2023,48（03）：92-96，86.
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；
基金：
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[3] 刘小燕，董三升，雷拓.钢-混凝土组合屋盖坍塌事故调查与分析[J].施工技术(中英文),2022,51(15):20-24.
[4] 潘钧俊，安东亚，王瑞峰，等.萧山国际机场T4航站楼钢结构屋盖连续倒塌分析[J].施工技术，2021,50(5):5-7,31.
[5] 鞠竹，王振清，韩玉来，等.火灾高温作用下钢结构倒塌分析[J].工程力学，2014,31(S1):121-124.
[6] 蓝声宁，钟新谷.湘潭轻型钢结构厂房雪灾受损分析与思考[J].土木工程学报，2009,42(3):71-75.
[7] 谢甫哲.钢框架结构连续坍塌计算分析与评估方法及试验研究[D].南京：东南大学，2011.
[8] 王帅.钢框架子结构抗连续倒塌性能试验研究[D].哈尔滨：哈尔滨工业大学，2015.
[9] IZZUDDIN B A,VLASSIS A G,ELGHAZOULI A Y,et al.Progressive collapse of multi-storey buildings due to sudden column loss—part I:simplified assessment framework[J].Engineering Structures,2008,30(5):1308-1318.
[10] VLASSIS A G,IZZUDDIN B A,ELGHAZOULI A Y,et al.Progressive collapse of multi-storey buildings due to sudden column loss—part II:Application[J].Engineering Structures,2008,30(5):1424-1438.
[11] DEMONCEAU J F,JASPART J P.Experimental and analytical investigations on the response of structural building frames further to a column loss[C]//Structures Congress 2009.Reston,VA:American Society of Civil Engineers,2009:1-10.
[12] SONG B I,SEZEN H.Evaluation of an existing steel frame building against progressive collapse[C]//Structures Congress 2009.Reston,VA:American Society of Civil Engineers,2009:1-8.
[13] JOHNSON E S,WEIGAND J M,FRANCISCO T,et al.Large-scale testing of a steel-concrete composite floor system under column loss scenarios[C]//Structures Congress 2014.Reston,VA:American Society of Civil Engineers,2014:978-987.
[14] 钢结构设计标准：GB 50017—2017[S].北京：中国建筑工业出版社，2018.
[15] 钢结构加固技术规范：CECS 77:96[S].北京：中国计划出版社，2005.
Technical analysis on overall collapse cause of a steel structure project
Abstract: Through the investigation and analysis of the overall collapse accident of a steel structure project in a hotel, it was found that the reason for its collapse is that the self-weight of the structure increased significantly after the reconstruction of mezzanine. As a result, the flexural bearing capacity of the column end in the joint zone was insufficient in the spindle plane, plastic damage appeared in the column, and the local buckling of the compression flange in the joint zone of H-shaped steel column caused instability failure. The irrational design and selection of steel column shape was the main cause of its instability failure, and the braces were not set up to support. In the construction, upper and lower flanges of steel beam at its connection joint with steel column were not welded or welded in poor welding quality, changing rigid connection into hinged joint. This resulted in the structure becoming a frame-bent structure or partial frame-bent structure with poor overall stability and serious defects in the structural system. This would lead to the instability damage of steel column to cause the whole structure to collapse instantly.
Keywords: steel structure; reconstruction of mezzanine; collapse; instability; analysis of accident
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