Nested tube system applicable to protective structures against blast shock

Abstract Aiming at developing an efficient energy absorption component for protecting structures against blast shock, this paper proposes a triple-tube system (TT) consisting of three tubes. Its performance is studied experimentally and numerically, and compared with that of a double-tube system (DT) and a single-tube system (ST). The results show that the TT system can provide the highest energy absorption efficiency and the most stable deformation mode, so as to enhance energy absorption capacity for protecting structures. Then a parametric study is conducted to investigate the effect of the geometric parameters on the performance of the TT system and theoretical prediction of stage load is proposed to provide guidance for designing an effective TT system. Finally, the TT system is applied to a blast-resistance door used in civil air defense headquarters. The results demonstrate that the TT system can provide the most efficient impact force reduction and the lightest weight in protecting the structures from damage under blast shock wave.