鋼筋混凝土框架中柱突然失效模擬試驗*
李鳳武1，2，肖巖1，3，趙禹斌1，Sashi Kunnath1,4，Hai S. Lew5
- 摘 要
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(1 湖南大學(xué)建筑安全與節(jié)能教育部重點實驗室， 長沙 410082； 2 湖南省建筑設(shè)計院， 長沙 410011；3 美國南加州大學(xué)， 洛杉磯 CA 90089; 4 美國加州大學(xué)戴維斯分校， 戴維斯 CA 95616；5 美國標(biāo)準(zhǔn)及技術(shù)研究院， 馬里蘭 MD 20899)［摘要］在偶然荷載作用下結(jié)構(gòu)的失效機理是結(jié)構(gòu)設(shè)計的一個重要內(nèi)容。為研究框架結(jié)構(gòu)在中柱突然失效后結(jié)構(gòu)的動力反應(yīng)、內(nèi)力重分布和破壞形態(tài)，進(jìn)行了1/2比例的三層3×3跨鋼筋混凝土框架模型的倒塌試驗。試驗中采用氫氣炮將中柱模型擊潰，通過分析破壞瞬間結(jié)構(gòu)的位移反應(yīng)、加速度反應(yīng)、鋼筋應(yīng)變以及試驗后裂縫的開展情況，研究了結(jié)構(gòu)在偶然荷載作用下的變形和內(nèi)力重分布及破壞狀態(tài)。試驗結(jié)果表明，按照抗震規(guī)范設(shè)計的鋼筋混凝土框架結(jié)構(gòu)在突然撤除中柱后具有較好的防連續(xù)倒塌能力，材料在瞬時荷載作用下強度的提高有利于減小動力效應(yīng)對結(jié)構(gòu)的影響。并利用SAP2000有限元分析軟件進(jìn)行了對比分析。［關(guān)鍵詞］鋼筋混凝土框架; 防連續(xù)倒塌; 有限元分析; 加速度; 模擬試驗中圖分類號：TU375.4 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)23-0057-05Collapse tests of RC frame with sudden middle column removalLi Fengwu1,2, Xiao Yan1,3, Zhao Yubin1, Sashi Kunnath1,4, Hai S. Lew5(1 Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education, College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Hunan Provincial Architectural Design Institute, Changsha 410011, China; 3 University of Southern California, Los Angeles CA 90089, USA; 4 University of California, Davis CA 95616, USA; 5 National Institute of Standards and Technology, Maryland MD 20899, USA)Abstract: In order to understand the failure mechanism and resistance to progressive collapse, collapse tests of a 1/2 scale, 3-bay and 3-story reinforced concrete frame model with sudden middle column removal were carried out. A gas gun was used to destroy the middle column model. The dynamic response, internal force redistribution, and damage of the frame were studied through analyzing the displacement response, acceleration response, reinforcement strains and crack patterns. Testing results show that the building designed according to the current seismic design codes have good collapse-resistant performance when only one middle column suddenly is removed. The dynamic increase effect of material strength under sudden load action can reduce the influence of damage effect. Comparative analysis was also carried out using SAP2000.Keywords: RC frame; progressive collopse resistance; finit element analysis; acceleration; collapse test*“985”工程專項經(jīng)費（531106004003），“千人計劃”專項經(jīng)費（531106004009），教育部“建筑安全與節(jié)能”重點實驗室資助（531107040089）。作者簡介：李鳳武，博士研究生，高級工程師，一級注冊結(jié)構(gòu)工程師，Email：fwli@163.com。參考文獻(xiàn)［1］ASTANEH-ASL A, MADSEN A E, NOBLE C, et al. Use of catenary cables to prevent progressive collapse of buildings［R］. Report of UCB/CEE-STEEL-2001/02. Berkeley: University of California at Berkeley, 2001:1-87.［2］WOODSON S C, BAYLOT J T. Structural collapse: quarter-scale model experiments［R］. Technical Report SL-99-8. Vicksburg: US Army Engineer Research and Development Center, 1999.［3］SASANI M, BAZAN M, SAGIROGLU S. Experimental and analytical progressive collapse evaluation of actual reinforced concrete structures［J］. ACI Structural Journal, 2007, 104(6): 731-739.［4］易偉建, 何慶鋒, 肖巖. 鋼筋混凝土框架結(jié)構(gòu)抗倒塌性能的試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報, 2007, 28(5): 104-109.［5］趙禹斌. 二分之一比例三層RC框架角柱突然失效模擬試驗研究［D］.長沙：湖南大學(xué)，2013.
