El efecto P-delta y su influencia sobre la ductilidad de las estructuras metálicas del Ecuador

Abstract

Current earthquake-resistant procedures prescribe generic values for the response reduction factors, regardless of the configurational and geometric characteristics of the designed buildings. It is well know that those response reduction factors values reflect the expected behaviour of the structures when they are under strong ground motions, being this seismic behaviour usually evaluated through ductility and over strength. In this work, calculated values of the ductility of special moment- resisting steel frames with different span lengths and designed according the Ecuadorian Construction Code, are presented. Results show that the ductility of the buildings is strongly influenced by the spans length and they would reach inadequate values if the second-order effect P − Δ occurs