The present paper deals with evaluating displacements of structures under seismic excitation. In particular, it investigates the influence of the actual dissipative capacity related to the hysteretic behaviour of the dissipative structural components. After a short overview of the most common methods for nonlinear static analysis of structures under earthquake actions, a wide parametric analysis is proposed for investigating the relationship between demanded ductility and dissipative capacity of structures. A simplified ring-spring force-displacement relationship is considered in this study, as its hysteretic loop which defines the actual dissipative capacity can be easily described by a unique dimensionless parameter. The main results of the above mentioned parametric analysis are reported in terms of both average values and dispersion indices, so that the variation of the structural response depending on the relevant mechanical parameter can be described. Finally, a simplified relationship for evaluating the ductility demand taking account of the actual dissipative capacity of structures is proposed.
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