Influence of P-delta effect on ductility and vulnerability of SMRF steel buildings

Juan Carlos Vielma Pérez, Manuel Antonio Cando Loachamín

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)351-362
Number of pages12
JournalOpen Civil Engineering Journal
Issue number1
StatePublished - 2015
Externally publishedYes


  • Ductility
  • Non-linear analysis
  • P-Δ effect
  • Span length
  • Vulnerability


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