A new composite protective structure based on the controllability of blast load on the structure layer (Ⅱ): influence factors and design concept

Experimental and numerical investigations are carried out to clarify the influence of the thickness and strength of the foam concrete layer on the blast resistance of the new composite protective structure. The multilayer graded foam concrete is applied to adequately and rationally use the good wave dissipation performance of foam concrete. Then the advantage of the new composite protective structure is verified by comparison with the traditional layered structure with medium/coarse sand as the distribution layer. Finally, the design concept of composite protective structures based on the controllability of blast load on the structure layer is summarized. The foam concrete can be used as an energy control layer of the composite protective structure mainly due to its long yield plateau and low wave impedance. The blast load acting on the structure layer can be exactly equal to the yield strength of the foam concrete by choosing the appropriate thickness and strength (density) of the foam concrete layer, as well as the use of the multilayer graded foam concrete. Based on the controllable design concept of blast load on the structure layer in the new composite protective structure, the defects of traditional layered protective structure with medium/coarse sand as the distribution layer can be solved thoroughly. The results can provide an important reference for the design of protective structures against new earth penetration weapons.