圆柱形装药不确定爆炸作用下钢管RPC柱的破坏机理  

Failure mechanisms of RPC-filled steel tubular columns under uncertain loading induced by cylindrical charge

作　　者：马建军 陈建营 陈万祥 薛海恩 许正阳 MA Jianjun;CHEN Jianying;CHEN Wanxiang;XUE Haien;XU Zhengyang(School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082,China)

机构地区：[1]中山大学土木工程学院,广东珠海519082 [2]陆军工程大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007 [3]南方海洋科学与工程广东省实验室,广东珠海519082

出　　处：《中山大学学报（自然科学版）（中英文）》2023年第3期68-78,共11页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(52278422,51578541)。

摘　　要：对不确定爆炸作用下的钢管RPC柱动态响应进行数值模拟,分析钢管RPC柱的破坏机理。采用LS-DYNA软件,对圆柱形装药在不同放置方式、长径比和起爆点下的爆炸作用进行数值模拟,分析比例距离为0.4~0.8 m/kg^(1/3)时的爆炸荷载分布规律,得到反射超压峰值均值和最大值的多项式拟合,并建立了不确定爆炸荷载模型。将统计荷载简化为等效爆炸荷载施加于钢管RPC柱表面,对其动态响应和破坏机理进行分析。结果表明:反射超压峰值服从正态分布,钢管RPC柱在不确定爆炸作用下表现出跨中部位发生明显弯曲变形,而靠近支座部位发生剪切变形;以爆炸荷载的平均值和最大值来预测钢管RPC柱的损伤状况时,后者得到的破坏程度明显大于前者,且结构更趋于剪切破坏。Dynamic responses of RPC-filled steel tubular(RPC-FST)columns under uncertain blast loading are investigated,and the failure mechanisms are further analyzed.The blast loads,induced by cylindrical charge with different orientations,length-to-diameter ratios and detonation positions,are simulated using LS-DYNA software.The distributions of shock waves caused by explosive charge with scaled distance ranging from 0.4 m/kg^(1/3) to 0.8 m/kg^(1/3) is obtained,and normal distribution tests are carried out based on the numerical results.The polynomial fitting formulas for average and maximum values of peak reflected overpressure are achieved,and the uncertain blast models are finally presented.The dynamic responses and failure mechanisms of the RPC-FST column are analyzed systematically by simplifying the statistical loads into equivalent loads.Results show that the reflected overpressure follows normal distribution.The bending deformations can be observed in the middle span of the RPC-FST column,while shear deformations are found near the support.More severe damage can be observed in the RPC-FST column subjected to maximum blast loading compared to the average value,and the structure tends to shear failure.

关 键 词：钢管RPC柱 不确定爆炸荷载 正态分布 动态响应 破坏机理 

分 类 号：TU398.9[建筑科学—结构工程]