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(福建省建筑設(shè)計(jì)研究院有限公司, 福州 350001)

摘要: 通過(guò)對(duì)某酒店鋼結(jié)構(gòu)工程整體坍塌事故案例開(kāi)展調(diào)查與分析發(fā)現(xiàn),其坍塌是由于加夾層改建后結(jié)構(gòu)自重明顯增加,導(dǎo)致節(jié)點(diǎn)區(qū)柱端在主軸平面內(nèi)的壓彎承載力不足,柱中出現(xiàn)塑性損傷,H 型鋼柱節(jié)點(diǎn)區(qū)受壓翼緣局部屈曲引起失穩(wěn)破壞;鋼柱設(shè)計(jì)選型不合理是造成其失穩(wěn)破壞的主因,且未設(shè)置柱間支撐,施工上鋼梁與鋼柱連接處上下翼緣未焊接或焊接質(zhì)量差導(dǎo)致剛接變成鉸接,從而造成結(jié)構(gòu)成為排架結(jié)構(gòu)或局部排架結(jié)構(gòu),結(jié)構(gòu)整體穩(wěn)定性差,其結(jié)構(gòu)體系存在嚴(yán)重缺陷,最終鋼柱失穩(wěn)破壞引起結(jié)構(gòu)整體瞬間坍塌.

關(guān)鍵詞: 鋼結(jié)構(gòu); 夾層改建; 坍塌; 失穩(wěn); 事故分析

中圖分類(lèi)號(hào):TU391 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)03-0092-05

DOI:10. 19701 / j. jzjg. 20211637

Technical analysis on overall collapse cause of a steel structure project

LIAO Wenbin

(Fujian Architectural Design and Research Institute Co. , Ltd. , Fuzhou 350001, China)

Abstract: Through the investigation and analysis of the overall collapse accident of a steel structure project in a hotel, itwas found that the reason for its collapse is that the self-weight of the structure increased significantly after thereconstruction of mezzanine. As a result, the flexural bearing capacity of the column end in the joint zone was insufficient inthe spindle plane, plastic damage appeared in the column, and the local buckling of the compression flange in the jointzone of H-shaped steel column caused instability failure. The irrational design and selection of steel column shape was themain cause of its instability failure, and the braces were not set up to support. In the construction, upper and lower flangesof steel beam at its connection joint with steel column were not welded or welded in poor welding quality, changing rigidconnection into hinged joint. This resulted in the structure becoming a frame-bent structure or partial frame-bent structurewith poor overall stability and serious defects in the structural system. This would lead to the instability damage of steelcolumn to cause the whole structure to collapse instantly.

Keywords:steel structure; reconstruction of mezzanine; collapse; instability; analysis of accident

第一作者:廖文彬,碩士,教授級(jí)高級(jí)工程師,主要從事工程結(jié)構(gòu)設(shè)計(jì)工作,Email:744895349@ qq. com.

[引用本文] 廖文彬. 某鋼結(jié)構(gòu)工程整體坍塌原因技術(shù)分析[J]. 建筑結(jié)構(gòu),2023,53(3):92-96,86. LIAO Wenbin.Technical analysis on overall collapse cause of a steel structure project[J]. Building Structure,2023,53(3):92-96,86.