爆炸荷载下钢筋混凝土框架连续倒坍特性及影响因素研究  

Influencing factors and features of progressive collapse of reinforced concrete frame under blast loading

作　　者：周继凯[1] 庄天文 慕建磊[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《混凝土》2015年第4期5-8,13,共5页Concrete

基　　金：国家自然科学基金项目(51178162;51479048)

摘　　要：防止结构在爆炸荷载下连续倒坍问题日益受到广泛关注。采用ANSYSLS-DYNA软件,对钢筋混凝土框架进行爆炸荷载作用下数值模拟。通过结构的动态响应,研究失效构件位置、构件尺寸、配筋率、炸药距离等参数对框架结构整体连续倒坍行为的影响。数值模拟分析结果表明:边柱失效比中柱失效引起的破坏更严重;适当提高配筋率或增加梁高可降低结构连续倒坍可能性;楼板形成的悬链效应能延缓连续倒坍速度;爆炸距离稍远结构连续倒坍风险显著降低;采用缓冲吸能材料(泡沫铝板)对于结构的关键构件进行安全防护,是防止框架结构连续倒坍的有效措施。研究成果可以为参数影响分析和爆炸荷载作用下钢筋混凝土框架连续倒坍破坏模式控制提供参考。The issue of preventing structures from progressive collapse under explosive load,the frontiers in structural engineering research,has drawn increasing attention nowadays. Numerical simulation by ANSYS LS-DYNA on reinforced concrete frame under blast loading,with the dynamic response of structures,demonstrates some influencing factors on progressive collapse behavior of the whole structure such as component locations,scantlings,reinforcement ratio,explosive distance and other parameters. The simulation and analysis results shows that side column failure causes more serious damage than middle column; increase in the reinforcement ratio or the beam height reduces the probability of progressive collapse; catenary effect of slabs decreases the speed of progressive collapse; little increase in the explosive distance significantly reduces the risk of progressive collapse; the use of energy absorbing materials（ such as aluminum foam board） of key component for protection is an effective measure to prevent progressive collapse of the structure. Results in this paper provide a reference for further studies in parameter analysis or detonation pattern control of reinforced concrete frame progressive collapse under blast loading.

关 键 词：钢筋混凝土框架 连续倒坍 爆炸荷载 数值模拟 影响因素 

分 类 号：TU528.01[建筑科学—建筑技术科学]