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Abstract
The seismic behavior of asymmetric building structures is often complex and reductions to plane problems which can be analyzed with a single horizontal ground-motion component are often deemed unsatisfactory. As a consequence, dynamic structural analyses with both horizontal ground-motion components become more common, both in research as well as in practice. A review of code provisions regarding selection and scaling of ground motions for bi-directional analysis has, however, revealed that the guidelines provided are frequently inconsistent or are lacking transparency regarding the underlying assumptions. The aim of this study is to shed some light on a number of aspects involved when selecting and scaling records for bi-directional analysis and post-processing results of such analyses.
Acknowledgments
The authors firstly wish to thank Prof. Nigel Priestley who initiated this project with his thought-provoking keynote lecture at the 5th International Seminar at the ROSE School in Pavia, Italy in 2005. The authors would like to sincerely thank Dr. Paolo Bazzurro and Dr. Iunio Iervolino for the pertinent and insightful comments which significantly improved the article regarding both content and readability. The authors would also like to express their gratitude towards Prof. Paolo Pinto and Dr. Paolo Franchin for the fruitful discussions at the start of this study. The first author would also like to express her gratitude to John Alarcón, Guillermo Aldama, John Hancock, Rishmila Mendis, and Fleur Strasser who contributed to the work during many discussions related to different aspects of engineering seismology.