ESTIMACIÓN DE LA DEMANDA INELÁSTICA EN SISTEMAS DE UN GRADO DE LIBERTAD, PARA LA NORMA SÍSMICA DE GUAYAQUIL

Abstract

This research presents a methodology for the approximation of design parameters used in the analysis of structures in the inelastic range. The research is based on the results obtained from various dynamic ground response analysis of 53 geotechnical sites in the city of Guayaquil, developed by the Ecuadorian company GeoEstudios S.A. Having estimated the seismic demand at surface of such sites (in terms of time-history acceleration records), it proceeds with the calculation of the inelastic demand parameters (such as: the ductility reduction factor and the displacement amplification factor), for single degree of freedom systems induced to site effects for a non-lineal (hysteretic) model. The hysteretic model implemented in this calculation is the elasto-perfectly plastic model, and the processing of the information has been carried out by means of the iterative algorithm BISPEC (Hachem, 2000). The results of this research show the need to incorporate the considerations of non-linear behavior in the new Seismic Code of Guayaquil "NSG-19", due to the ambiguity of several generalizations existing in the current edition of the Ecuadorian Building Code " NEC-15 ".