- 摘 要
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（1 蘭州理工大學土木工程學院， 蘭州 730050； 2 甘肅省建筑設計研究院， 蘭州 730030）
［摘要］以甘肅省體育館鋼桁架為研究對象，根據事件控制、概念設計和直接設計法對由平面桁架構成的主桁架體系及懸掛結構體系進行防連續(xù)倒塌方法探討。結合設計依據對荷載組合、失效準則進行了討論。根據完整結構與剩余結構應變能不同的思想，提出了基于位移向量改進的構件重要性分析方法。并對主桁架系統及懸掛結構的重要構件、幾何位置分布、整體結構中空間作用的分布情況進行了分析。按構件重要性評定方法所得結果與工程經驗及數值分析結果一致，能定量地判定整體結構中的關鍵構件，為拆除桿件法提供了必要的判定依據，便于工程實踐。采用ABAQUS數值分析平臺進行了結構連續(xù)性倒塌動力響應分析，并對內力重分布機制進行了研究，結果表明結構具有較強的抗連續(xù)倒塌能力。
［關鍵詞］甘肅省體育館； 構件重要性系數； 抗連續(xù)倒塌； 鋼桁架； 懸挑桁架； 數值模擬
中圖分類號：TU393-3文獻標識碼：A文章編號：1002-848X(2018)11-0057-07
Anti-progressive collapse analysis and mechanism study on steel truss of Gansu Province Gymnasium
Rui Jia1,2, Zhang Jutao2
(1 College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 Gansu Provincial Architectural Design & Research Institute, Lanzhou 730030, China)
Abstract:Taking the steel trusses of Gansu Province Gymnasium as the research object, the method of preventing progressive collapse of the main truss system and suspension structure system composed of plane truss was discussed based on event control, conceptual design and direct design methods. Based on the design basis, the load combination and failure criteria were discussed. Based on the idea that the strain energy of the complete structure is different from the strain energy of the residual structure, an improved component importance analysis method based on improved displacement vector was proposed. The main components, the distribution of geometrical positions, and the distribution of spatial effects in the overall structure of the main truss system and the suspension structure were analyzed. The result of evaluation method of component importance was consistent with the result of engineering experience and numerical analysis results. It could quantitatively determine the key components in the overall structure, and provide the necessary basis for determining the rod-dismantling method, which was convenient for engineering practice. The ABAQUS numerical analysis platform was used to analyze the dynamic response of structural progressive collapse, and the internal force redistribution mechanism was studied. The results show that the structure has strong resistance to progressive collapse.
Keywords:Gansu Province Gymnasium; component importance coefficient; anti-progressive collapse; steel truss; cantilever truss; numerical simulation
作者簡介：芮佳，博士研究生，高級工程師，Email：richard800910@163.com。
