Abstract The blast performance of ultra-high performance cementitious composites filled steel tube (UHPCC-FST) subjected to close-range explosion were investigated experimentally and numerically. Firstly, the field test of four circular UHPCC-FST specimens under the close-range TNT charge explosion with the scaled standoff distance Z of 0.12≤Z ≤ 0.14 m/kg1/3 were conducted, the global and local deformations of specimens were experimentally examined. Then, three methods were applied to analyze the dynamic responses of those specimens, i.e., numerical simulations based on Arbitrary-Lagrangian-Eulerian elements method (ALE method) and velocity loading method (velocity method), as well as the equivalent single degree of freedom method (SDOF method). By comparing the experimental data of the present and existing total nineteen close-range explosion test on CFST (0.14≤Z ≤ 0.58 m/kg1/3), the velocity method is recommended by considering both the accuracy and efficiency of computation. The derived conclusions could provide helpful references for evaluating the blast resistance and designing the CFST under potential close-range explosions.

中文翻译：

---

超高性能水泥基复合材料填充钢管（UHPCC-FST）近距离爆炸试验与数值研究

摘要 对超高性能水泥基复合材料填充钢管（UHPCC-FST）在近距离爆炸下的爆炸性能进行了实验和数值研究。首先，对4个圆形UHPCC-FST试件在近距离TNT装药爆炸下进行了0.12≤Z≤0.14 m/kg1/3的缩放距离Z ≤ 0.14 m/kg1/3的现场试验，对试件的整体和局部变形进行了实验研究. 然后，应用三种方法分析这些试件的动力响应，即基于任意-拉格朗日-欧拉单元法（ALE法）和速度加载法（速度法）的数值模拟，以及等效单自由度方法（SDOF 方法）。通过对比目前和现有共19个CFST（0.14≤Z≤0.58 m/kg1/3）近距离爆炸试验的实验数据，从计算的准确性和效率两方面推荐速度法。得出的结论可为评估潜在近距离爆炸下的抗爆能力和设计CFST提供有益的参考。