Dynamic Structure-Soil-Structure Interaction in unsymmetrical plan buildings due to seismic excitation

Felipe Vicencio*, Nicholas A. Alexander

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

32 Citations (Scopus)


This paper explores the influence of Structure-Soil-Structure Interaction (SSSI) between a pair of buildings, one of which is unsymmetrical in plan and hence subject to seismically induced coupled torsion/sway motions. A reduced-order parametric model of this system is proposed and validated using finite element analysis. A database of 15 strong ground motion records are employed. Over 3 million system/ground motion cases are analysed in this extensive parametric study. Results suggest that the SSSI can significantly affect the displacement and acceleration response of the unsymmetrical plan structures. Building torsion has the effect of increasing the building responses for a broader parametric range over which SSSI effects are significant. Additionally, a taller torsionally irregular building adjacent to a smaller building can in some parametric cases be adversely affected by SSSI. This finding contradicts results from previous studies, that were based on non-torsional, plan-regular, buildings, where the taller buildings are generally beneficially affected by the presence of smaller adjacent buildings.

Original languageEnglish
Article number105817
JournalSoil Dynamics and Earthquake Engineering
Early online date26 Sept 2019
Publication statusPublished - 1 Dec 2019


  • Structure-Soil-Structure Interaction
  • Time history seismic analysis
  • Unsymmetrical plan buildings


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