RESEARCH ARTICLE


Influence of P-Delta Effect on Ductility and Vulnerability of SMRF Steel Buildings



Juan Carlos Vielma Pérez1, 2, *, Manuel Antonio Cando Loachamín2
1 Departamento de Ingeniería Estructural, Universidad Centroccidental Lisandro Alvarado, Barquisimeto, Venezuela
2 Departamento de Ciencias de la Tierra y la Construcción, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador


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Creative Commons License
© 2015 Pérez and Loachamín

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Departamento de Ciencias de la Tierra y la Construcción, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador; Tel: +582512592135; Fax: +582512592104; E-mail: jcvielma@ucla.edu.ve


Abstract

Current earthquake-resistant procedures prescribe generic values for the response reductions factors, regardless of the configurational characteristics of the designed buildings. It is well know that these response reduction factors values reflect the expected behavior of the structures when they are under strong ground motions, being this seismic behavior 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 buildings’ ductility is strongly influenced by the spans length and they would reach inadequate values if the second-order effect P-Δ occur, and then indicating that the structures are more vulnerable than structures not affected by P-Δ effect.

Keywords: Ductility, non-linear analysis, P-Δ effect, span length, vulnerability.