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（北京市建筑設(shè)計研究院有限公司， 北京 100045）
［摘要］北京新機場航站樓屋頂及其支承屋頂?shù)慕Y(jié)構(gòu)均為鋼結(jié)構(gòu)，屋頂鋼結(jié)構(gòu)分為6個區(qū)域，包括中央大廳主樓及5條指廊。中央大廳主樓設(shè)置6組C形柱，形成直徑180m的中央大廳空間，在跨度較大的北中央大廳加設(shè)2組C形柱減小結(jié)構(gòu)跨度，C形柱采用格構(gòu)柱的結(jié)構(gòu)形式；指廊區(qū)由鋼柱和外幕墻柱形成穩(wěn)定結(jié)構(gòu)體系。采用有限元分析方法，研究了航站樓C形柱的抗連續(xù)倒塌性能、航站樓整體結(jié)構(gòu)的抗連續(xù)倒塌性能、C形柱失效影響范圍以及指廊結(jié)構(gòu)的抗連續(xù)倒塌性能。結(jié)果表明，C形柱抗連續(xù)倒塌性能良好，局部柱失效后其他柱柱底反力變化值可以為下部混凝土支承結(jié)構(gòu)提供極限承載力設(shè)計依據(jù)；整體結(jié)構(gòu)抗連續(xù)倒塌性能及失效影響范圍分析可以為C形柱的性能目標(biāo)提供制定依據(jù)；在1根主支承柱失效時，指廊鋼結(jié)構(gòu)不會發(fā)生連續(xù)倒塌。
［關(guān)鍵詞］北京新機場； 抗連續(xù)倒塌； 大跨鋼結(jié)構(gòu)； 拆除構(gòu)件法； 非線性動力分析； 生死單元
中圖分類號：TU391文獻標(biāo)識碼：A文章編號：1002-848X(2017)18-0010-05
Progressive collapse analysis on roof steel structure of terminal building of Beijing New Airport
Zhu Zhongyi, Wang Zhe, Shu Weinong, Qin Kai, Zhou Zhongfa, Zhang Lin
(Beijing Institute of Architectural Design, Beijing 100045, China)
Abstract:The roof and supporting system of terminal building of Beijing New Airport adopt steel structure. The roof steel structure of the terminal building is divided into 6 areas, including the central hall and 5 corridors. Part roof of the central hall is supported by 6 groups of C-shaped columns, which form an central area of 180m in diameter, 2 groups of C-shaped columns are added to the north of the central hall in order to reduce the span of the structure. C-shaped columns adopt latticed column style. The corridor is supported by steel tubular columns and curtain wall supporting columns, which form a stable structure system. The finite element method was adopted, resist progressive collapse behavior of C-shaped columns, resist progressive collapse behavior of the whole structure, influence range on C-shaped column failure, and resist progressive collapse behavior of the corridor were studied. The results indicate that, the resistance to progressive collapse is adequate when latticed column style is adopted by C-shaped columns, after partial column failure, the variable reactions of other columns would contribute to ultimate bearing capacity of lower concrete structure as a design basis. Performance of progressive collapse behavior of whole structure and influence range analysis would contribute to performance of C-shaped column as a design basis. When one primary brace is failed, no progressive collapse behavior is observed on the corridors.
Keywords:Beijing New Airport; progressive collapse; large span steel structure; alternate path method; nonlinear dynamic analysis; birth death element
作者簡介：朱忠義，博士，教授級高級工程師，Email:1027311973@qq.com。
