Abstract
An approximate procedure is presented for assessing the seismic response of irregular in elevation asymmetric buildings. The procedure is based on the concept of the equivalent single story system, which has been introduced by the author in earlier papers for assessing the response of uniform in height buildings, and retains the simplicity of the corresponding methodology. Frequencies and peak values of base resultant forces of multi story buildings with large setbacks, classified by Eurocode 8 as irregular structures, may be predicted by the proposed approximate method when the excitation is characterized by response spectra. The center of stiffness of the equivalent single story system defines the modal center of rigidity, and its coincidence with the mass axis of the real building specifies a structure which sustains an almost translational response into the elastic phase. Besides, such a structural configuration retains this response into the inelastic phase when the strength assignment of all lateral load resisting bents is stiffness proportional. The accuracy of the proposed procedure is first illustrated in mixed-bent-type eight-story elastic structures, which are characterized by EC8-2004 as irregular in elevation structures, and comparisons are made with the accurate results obtained by response spectrum analyses using the SAP2000 computer program. The inelastic response of these structures, when the strength of various bents is determined by a planar static analysis under a code lateral loading, is investigated under the Loma Prieta (1989) and Imperial Valley (1940) ground motions.
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Acknowledgements
This research has been co-financed by the European Union (European Social Fund – ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF) – Research Funding Program: ARCHIMEDES III. Investing in knowledge society through the European Social Fund. The author is grateful for this support.
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Georgoussis, G.K. (2016). An Approximate Method for Assessing the Seismic Response of Irregular in Elevation Asymmetric Buildings. In: Zembaty, Z., De Stefano, M. (eds) Seismic Behaviour and Design of Irregular and Complex Civil Structures II. Geotechnical, Geological and Earthquake Engineering, vol 40. Springer, Cham. https://doi.org/10.1007/978-3-319-14246-3_10
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DOI: https://doi.org/10.1007/978-3-319-14246-3_10
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