钢筋混凝土框架中柱突然失效模拟试验*
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(1 湖南大学建筑安全与节能教育部重点实验室， 长沙 410082； 2 湖南省建筑设计院， 长沙 410011；3 美国南加州大学， 洛杉矶 CA 90089; 4 美国加州大学戴维斯分校， 戴维斯 CA 95616；5 美国标准及技术研究院， 马里兰 MD 20899)［摘要］在偶然荷载作用下结构的失效机理是结构设计的一个重要内容。为研究框架结构在中柱突然失效后结构的动力反应、内力重分布和破坏形态，进行了1/2比例的三层3×3跨钢筋混凝土框架模型的倒塌试验。试验中采用氢气炮将中柱模型击溃，通过分析破坏瞬间结构的位移反应、加速度反应、钢筋应变以及试验后裂缝的开展情况，研究了结构在偶然荷载作用下的变形和内力重分布及破坏状态。试验结果表明，按照抗震规范设计的钢筋混凝土框架结构在突然撤除中柱后具有较好的防连续倒塌能力，材料在瞬时荷载作用下强度的提高有利于减小动力效应对结构的影响。并利用SAP2000有限元分析软件进行了对比分析。［关键词］钢筋混凝土框架; 防连续倒塌; 有限元分析; 加速度; 模拟试验中图分类号：TU375.4 文献标识码：A 文章编号：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”工程专项经费（531106004003），“千人计划”专项经费（531106004009），教育部“建筑安全与节能”重点实验室资助（531107040089）。作者简介：李凤武，博士研究生，高级工程师，一级注册结构工程师，Email：fwli@163.com。参考文献［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］易伟建, 何庆锋, 肖岩. 钢筋混凝土框架结构抗倒塌性能的试验研究［J］. 建筑结构学报, 2007, 28(5): 104-109.［5］赵禹斌. 二分之一比例三层RC框架角柱突然失效模拟试验研究［D］.长沙：湖南大学，2013.
