考慮樓梯的框架結構連續(xù)倒塌分析
王贊，劉國友，王寒冰，韋振飛，白梅
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王贊，劉國友，王寒冰，韋振飛，白梅（中國建筑標準設計研究院，北京 100048）［摘要］利用有限元軟件SAP2000的動力非線性計算方法對考慮樓梯與不考慮樓梯兩種情況下的框架進行連續(xù)倒塌計算，對比分析了樓梯位置處兩處框架柱失效時框架的抗連續(xù)倒塌能力。分析結果表明：當樓梯部位的柱失效時，考慮樓梯與不考慮樓梯對框架的連續(xù)倒塌計算影響很大。考慮樓梯后，模型失效點處的位移和框架梁的內力減小，部分柱內力增大；樓梯構件受力改變，可能會因此失效，但有利于實現荷載的多路徑傳遞，從而對框架的抗連續(xù)倒塌有利。［關鍵詞］連續(xù)倒塌；框架；樓梯；動力非線性分析中圖分類號：TU312文獻標識碼：A文章編號：1002-848X(2012)09-0090-04Progressive collapse analysis of frame structure with stairsWang Zan, Liu Guoyou, Wang Hanbing, Wei Zhenfei, Bai Mei(China Institute of Building Standard Design and Research, Beijing 100048, China)Abstract: Using nonlinear dynamic method of finite element software SAP2000, the progressive collapse analysis was taken on frame in which the stairs were not considered (frame 1) and on frame in which the stairs were considered(frame 2). The resistance to progressive collapse of the frame was analyzed while two frame columns at the location of the stairs separately failed suddenly. It is shown that the results of progressive collapse analysis are significantly different between the frame 1 and the frame 2. Compared with the result of the frame 1, the displacement of the failure point and the internal force of the beam of the frame 2 decrease, however, internal force of some columns increase. Internal force of the stair components changes and the stair components may fail for this reason. At the same time, a new vertical load path is created due to the stairs, which is advantageous for the resistance to progressive collapse of the frame.Keywords: progressive collapse; frame; stair; nonlinear dynamic analysis作者簡介：王贊，工程師，Email:wangz174255@126.com。參考文獻［1］General Services Administration. Progressive collapse analysis and design guidelines for new federal office buildings and major modernization projects［S］. Washington, D. C.,2003.［2］Department of Defense. Unified facilities criteria: Design of buildings to resist progressive collapse［S］. 2005.［3］北京金土木軟件技術有限公司,中國建筑標準設計研究院.SAP2000中文版使用指南［M］.北京:人民交通出版社,2006.［4］謝甫哲,舒贛平.基于抽柱法的鋼框架連續(xù)倒塌分析［J］.東南大學學報:自然科學版,2010,40(1):154-158.［5］王鐵成,劉傳卿.鋼框架結構動力連續(xù)倒塌分析［J］.建筑結構,2010,40(4):5-8.［6］Federal Emergency Management Agency. Prestandard and commentary for the seismic rehabilitation of buildings［S］. 2000.
