a structural system that is capable of absorbing high impactive and impulsive loads comprises of the following elements : main structure : should be one of certain types of structures such as : containments , reservoirs , tanks , storages , etc . outer shield : an outside hardened structure fixed by an anchorage system and resting on a sliding - plane . anchorage system : a set of anchors that hold the outer shield in place and collapses if the impactive or impulsive load exceeds certain level allowing the outer shield to slide crushing the filling layer and absorbing substantial amount of energy .