Abstract After discussing the state of the art of the development of equivalent force-time relationships for aircraft impact, the results of the so-called Riera model and of a lumped-mass model are compared for rigid and deformable targets. The importance of adequate modelling of structures to enable the calculation of response spectra also in the high-frequency range is demonstrated using a typical reactor shield building and a reactor auxiliary building. For an adequate model, the influence of the aircraft-structure interaction, of the material nonlinearly, of the damping and of the mass on the response of equipment is examined.
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