The purpose of this paper is to propose impact response calculation method using response spectrum based on identical impulses. For that purpose, the relationship between momentum of missiles and associated impact impulse were at first analyzed based on previous collision experiments due to hard and soft missiles, and hard missiles through shock absorbing installations such as sand and rubble. As a result, conservation of momentum proved to be realized on the whole and therefore the impulse necessary for calculation can be easily decided based on the momentum of missiles. Consequently, diagrams of impact response spectrums based on identical impulses were originally proposed and successfully applied to three cases. In conclusion, the calculation method can easily and rationally evaluate impact responses of structures.
