https://hal-cea.archives-ouvertes.fr/cea-02355368Politopoulos, IoannisIoannisPolitopoulosCEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) - CEA - Commissariat à l'énergie atomique et aux énergies alternativesFeau, CyrilCyrilFeauCEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) - CEA - Commissariat à l'énergie atomique et aux énergies alternativesSome aspects of floor spectra of 1DOF nonlinear primary structuresHAL CCSD2007ductility demandfloor spectralinearizationlinearization /[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex][PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]amplexor, amplexorRisk Mitigation for Earthquakes and Landslides - LESSLOSS - 28975 - OLD - 2019-12-02 14:05:272020-04-28 11:28:142019-12-06 14:21:07enJournal articleshttps://hal-cea.archives-ouvertes.fr/cea-02355368/document10.1002/eqe.664application/pdf1In this paper the influence of the nonlinear behaviour of the primary structure on floor spectra is investigated by means of simple models. The general trends of floor spectra for different types of nonlinear behaviour of one degree of freedom (1DOF) primary structure are shown and we point out their common futures and their differences. A special attention is given to the cases of elastoplastic and nonlinear elastic behaviours and methods to determine an equivalent linear oscillator are proposed. The properties (frequency and damping) of this equivalent linear oscillator are quite different from the properties of equivalent linear oscillators commonly considered in practice. In particular, in the case of elastoplastic behaviour, there is no frequency shift and damping is smaller than assumed by other methods commonly used. In the case of nonlinear elastic behaviour, the concept of an equivalent frequency which is a random variable is used. Finally, a design floor spectrum of primary structures, exhibiting energy dissipating nonlinear behaviour is proposed.