Experimental and numerical study of ultra-high performance cementitious composites filled steel tube (UHPCC-FST) subjected to close-range explosion

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.