El efecto P-delta y su influencia sobre la ductilidad de las estructuras metálicas del Ecuador
Abstract
RESUMEN
El diseño sismorresistente usual propone valores de factores de reducción de respuesta genéricos, independientes de las características geométricas y configuracionales de las edificaciones que se diseñan. Es bien sabido que los valores de estos factores de reducción de respuesta recogen el comportamiento esperado de las estructuras cuando son sometidas a acciones sísmicas fuertes, siendo el comportamiento frecuentemente evaluado mediante la ductilidad y el factor de reserva de resistencia. En este trabajo se presentan los resultados de los valores de ductilidad calculados a edificios con pórticos especiales resistentes a momentos con diferentes longitudes de vanos, proyectados conforme a la Norma Ecuatoriana de la Construcción. Los resultados muestran que la ductilidad de los edificios está fuertemente influenciada por la longitud de vanos, pudiendo llegar a alcanzar valores inadecuados al producirse el efecto de segundo orden
Palabras clave: Ductilidad, longitud de vano, análisis no lineal, efecto .
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.
Keywords: Ductility, span length, non-linear analysis, effect.
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