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

MA Jianjun; CHEN Jianying; CHEN Wanxiang; XUE Haien; XU Zhengyang

doi:10.13471/j.cnki.acta.snus.2022B031

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

Research articles | 更新时间：2023-11-01

- Failure mechanisms of RPC-filled steel tubular columns under uncertain loading induced by cylindrical charge
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 62, Issue 3, Pages: 68-78(2023)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2022B031
  CLC： TU398.9
- Published：25 May 2023，
  
  Published Online：31 January 2023，
  
  Received：21 March 2022，
  
  Accepted：09 May 2022
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马建军,陈建营,陈万祥等.圆柱形装药不确定爆炸作用下钢管RPC柱的破坏机理[J].中山大学学报(自然科学版),2023,62(03):68-78.

MA Jianjun,CHEN Jianying,CHEN Wanxiang,et al.Failure mechanisms of RPC-filled steel tubular columns under uncertain loading induced by cylindrical charge[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(03):68-78.
马建军,陈建营,陈万祥等.圆柱形装药不确定爆炸作用下钢管RPC柱的破坏机理[J].中山大学学报(自然科学版),2023,62(03):68-78. DOI： 10.13471/j.cnki.acta.snus.2022B031.

MA Jianjun,CHEN Jianying,CHEN Wanxiang,et al.Failure mechanisms of RPC-filled steel tubular columns under uncertain loading induced by cylindrical charge[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(03):68-78. DOI： 10.13471/j.cnki.acta.snus.2022B031.

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。

Abstract

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

Keywords

RPC-filled steel tubular columnuncertain blast loadinglognormal distributiondynamic responsefailure mechanism

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