中柱失效下多层框架的连续性倒塌分析与机理研究
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摘要
进行抗连续倒塌分析时,常将多层框架结构简化为单层子结构,然后将单层结构的特性用于多层框架的研究,但目前的简化模型不能够完全反映结构整体受力特性,忽略了空腹机制的作用。基于两跨梁模型研究单层框架的抗倒塌机制,提出梁机制和悬链线机制的抗力计算方法,并通过算例验证了所提方法的正确性;为分析空腹机制对多层框架整体受力的影响,建立顶层梁柱模型,引入空腹机制对抗连续倒塌的贡献指标;分析俄亥俄综合大楼拆除四根柱后的抗倒塌机制。结果表明简化模型是合理的,多层框架结构顶层和底层表现出不同的倒塌机制,空腹机制与其它机制共同抵抗不平衡荷载,俄亥俄综合大楼具有较好的抗连续倒塌性能。
Multi-story frame structures are often simplified as single-story substructures to study their progressive collapse resistance,in which a single-story substructure is studied and its behavior is applied to multi-story frame analysis.However,due to ignoring the effect of the vierendeel mechanism,the current simplified model could not fully reflect the mechanical behaviors of the whole structure. Based on a double-span beam model,the collapse mechanism of the singlestory substructure was studied,and a resistance calculation method for the beam mechanism and catenary mechanism was proposed,which was then validated by numerical examples. To analyze the effect of the vierendeel mechanism on the overall behavior of multi-story frames,a top-floor substructure model was established,and the contribution index of the vierendeel mechanism against the progressive collapse was introduced. Incorporating with the above models,the process of demolishing four columns of the Ohio Union building was simulated. The results show that the simplified models are reasonable. The top and bottom stories of the multi-story frame show different anti-collapse mechanism,and the vierendeel mechanism together with other mechanisms resist the unbalanced load. At the same time,it is found that the Ohio Union building has good resistance to progressive collapse.
Multi-story frame structures are often simplified as single-story substructures to study their progressive collapse resistance,in which a single-story substructure is studied and its behavior is applied to multi-story frame analysis.However,due to ignoring the effect of the vierendeel mechanism,the current simplified model could not fully reflect the mechanical behaviors of the whole structure. Based on a double-span beam model,the collapse mechanism of the singlestory substructure was studied,and a resistance calculation method for the beam mechanism and catenary mechanism was proposed,which was then validated by numerical examples. To analyze the effect of the vierendeel mechanism on the overall behavior of multi-story frames,a top-floor substructure model was established,and the contribution index of the vierendeel mechanism against the progressive collapse was introduced. Incorporating with the above models,the process of demolishing four columns of the Ohio Union building was simulated. The results show that the simplified models are reasonable. The top and bottom stories of the multi-story frame show different anti-collapse mechanism,and the vierendeel mechanism together with other mechanisms resist the unbalanced load. At the same time,it is found that the Ohio Union building has good resistance to progressive collapse.
引文
[1]王伟,李玲,陈以一,等.方钢管柱-H形栓焊混合连接节点抗连续性倒塌性能试验研究[J].建筑结构学报,2014,35(4):92-99.WANG Wei, LI Ling, CHEN Yiyi, et al. Experimental investigation on progressive collapse behavior of WUF-B connections between SHS column and H beam[J]. Journal of Building Structures,2014,35(4):92-99.
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[14] SAGIROGLU S,SASANI M. Progressive collapse-resisting mechanisms of reinforced concrete structures and effects of initial damage locations[J]. Journal of Structural Engineering,2013,140(3):04013073.
[15]何庆锋,刘义仁,周超,等.冲击作用下钢筋混凝土框架抗连续倒塌数值模拟[J].振动与冲击,2016,35(23):56-64.HE Qingfeng,LIU yiren,ZHOU Chao,et al. Numerical simulation for progressive collapse of a reinforced concrete frame under impact load[J]. Journal of Vibration and Shock,2016,35(23):56-64.
[16] NAJI A,IRANI F. Progressive collapse analysis of steel frames:simplified procedure and explicit expression for dynamic increase factor[J]. International Journal of Steel Structures,2012,12(12):537-549.
[17]周育泷,李易,陆新征,等.钢筋混凝土框架抗连续倒塌的压拱机制分析模型[J].工程力学,2016,33(4):34-42.ZHOU Yulong,LI Yi,LU Xinzheng,et al. An analytical model of compressive arch action of reinforced concrete frames to resist progressive collapse[J]. Engineering Mechanics,2016,33(4):34-42.
[18] IZZUDDIN B A. Simplified model for axially restrained beams subject to extreme loading[J]. International Journal of Steel Structures,2005,5(5):421-429.
[19] SONG B I, SEZEN H. Experimental and analytical progressive collapse assessment of a steel frame building[J].Engineering Structures,2013,56:664-672.
[20]王铁成,刘传卿.连续倒塌现象中结构动态响应特性的分析[J].振动与冲击,2010,29(5):69-73.WANG Tiecheng, LIU Chuanqing. Dynamic response analysis of a frame structure in progressive collapse phenomena[J]. Journal of Vibration and Shock,2010,29(5):69-73.
[21]张月强,丁洁,张峥.大跨度钢结构抗连续倒塌动力分析关键问题研究[J].建筑结构学报,2014,35(4):49-56.ZHANG Yueqiang,DING Jie,ZHANG Zheng. Study on key issues of dynamic analysis for anti-progressive collapse of large span steel structure[J]. Journal of Building Structures,2014,35(4):49-56.
[2]秦希,王伟.隔板贯通式全螺栓节点抗连续性倒塌性能数值模拟分析[J].振动与冲击,2015,34(10):68-75.QIN Xi,WANG Wei. Numerical simulation for progressive collapse behavior of through diaphragm bolted beam-column joints[J]. Journal of Vibration and Shock,2015,34(10):68-75.
[3]史艳莉,石晓飞,王文达,等.圆钢管混凝土柱-H钢梁内隔板式节点抗连续倒塌机理研究[J].振动与冲击,2016,35(19):148-155.SHI Yanli,SHI Xiaofei,WANG Wenda,et al. Progressive collapse mechanism for H-beam—concrete-filled steel tubular column connections with steel inner-diaphragm joints[J].Journal of Vibration and Shock,2016,35(19):148-155.
[4]霍静思,王宁,陈英.钢框架焊接梁柱节点子结构抗倒塌性能试验研究[J].建筑结构学报,2014,35(4):100-108.HUO Jingsi,WANG Ning,CHEN Ying. Experimental study on collapse resistance of welded beam-column connection substructure of steel frame based on seismic design[J].Journal of Building Structures,2014,35(4):100-108.
[5] YANG Bo,TAN Kanghai. Experimental tests of different types of bolted steel beam-column joints under a centralcolumn-removal scenario[J]. Engineering Structures,2013(54):112-130.
[6] ZHONG W H,MENG B,HAO J P. Performance of different stiffness connections against progressive collapse[J]. Journal of Constructional Steel Research,2017,135:162-175.
[7]李易,叶列平,陆新征.基于能量方法的RC框架结构连续倒塌抗力需求分析I:梁机制[J].建筑结构学报,2011,32(11):1-8.LI Yi, YE Lieping, LU Xinzheng. Progressive collapse resistance demand of RC frame structures based on energy method I:beam mechanism[J]. Journal of Building Structures,2011,32(11):1-8.
[8] IZZUDDIN B A,VLASSIS A G,ELGHAZOULI A Y,et al.Progressive collapse of multi-storey buildings due to sudden column loss-Part I:Simplified assessment framework[J].Engineering Structures,2008,30(5):1308-1318.
[9] STYLIANIDIS P M,NETHERCOT D A,IZZUDDIN B A,et al. Study of the mechanics of progressive collapse with simplified beam models[J]. Engineering Structures,2016,117:287-304.
[10]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.YI Weijian,HE Qingfeng,XIAO Yan. Collapse performance of RC frame structure[J]. Journal of Building Structures,2007,28(5):104-109.
[11]谢甫哲,舒赣平.平面钢框架结构抗倒塌动力试验研究[J].建筑结构学报,2016,37(12):144-152.XIE Fuzhe,SHU Ganping. Dynamic experiment on collapseresistant behavior of plane steel frame structure[J]. Journal of Building Structures,2016,37(12):144-152.
[12]李国强,李六连,陆勇.平面钢框架瞬时冲击去柱抗连续性倒塌试验研究[J].振动与冲击,2017,36(11):48-56.LI Guoqiang,LI Liulian,LU Yong. Tests for progressive collapse of planar steel frames under a column sudden removal[J]. Journal of Vibration and Shock,2017,36(11):48-56.
[13] YU J,TIAN J W. Is the load transfer mechanism of each story in a multi-Story building the same subjected to progressive collapse[J]. Structures Congress 2017:165-179.
[14] SAGIROGLU S,SASANI M. Progressive collapse-resisting mechanisms of reinforced concrete structures and effects of initial damage locations[J]. Journal of Structural Engineering,2013,140(3):04013073.
[15]何庆锋,刘义仁,周超,等.冲击作用下钢筋混凝土框架抗连续倒塌数值模拟[J].振动与冲击,2016,35(23):56-64.HE Qingfeng,LIU yiren,ZHOU Chao,et al. Numerical simulation for progressive collapse of a reinforced concrete frame under impact load[J]. Journal of Vibration and Shock,2016,35(23):56-64.
[16] NAJI A,IRANI F. Progressive collapse analysis of steel frames:simplified procedure and explicit expression for dynamic increase factor[J]. International Journal of Steel Structures,2012,12(12):537-549.
[17]周育泷,李易,陆新征,等.钢筋混凝土框架抗连续倒塌的压拱机制分析模型[J].工程力学,2016,33(4):34-42.ZHOU Yulong,LI Yi,LU Xinzheng,et al. An analytical model of compressive arch action of reinforced concrete frames to resist progressive collapse[J]. Engineering Mechanics,2016,33(4):34-42.
[18] IZZUDDIN B A. Simplified model for axially restrained beams subject to extreme loading[J]. International Journal of Steel Structures,2005,5(5):421-429.
[19] SONG B I, SEZEN H. Experimental and analytical progressive collapse assessment of a steel frame building[J].Engineering Structures,2013,56:664-672.
[20]王铁成,刘传卿.连续倒塌现象中结构动态响应特性的分析[J].振动与冲击,2010,29(5):69-73.WANG Tiecheng, LIU Chuanqing. Dynamic response analysis of a frame structure in progressive collapse phenomena[J]. Journal of Vibration and Shock,2010,29(5):69-73.
[21]张月强,丁洁,张峥.大跨度钢结构抗连续倒塌动力分析关键问题研究[J].建筑结构学报,2014,35(4):49-56.ZHANG Yueqiang,DING Jie,ZHANG Zheng. Study on key issues of dynamic analysis for anti-progressive collapse of large span steel structure[J]. Journal of Building Structures,2014,35(4):49-56.