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Inelastic seismic shear in multi-storey cantilever columns

Inelastic seismic shear in multi-storey cantilever columns

Fischinger, Matej, Ercolino, Marianna ORCID: 0000-0001-8678-0631, Kramar, Miha, Petrone, Crescenzo and Isakovic, Tatjana (2012) Inelastic seismic shear in multi-storey cantilever columns. In: Proceedings of the 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Institute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens (NTUA), Corfu, Greece, pp. 3780-2789. ISBN 978-960-99994-1-0

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Seismic shear magnification in the columns of multi-storey precast structures entering far into inelastic domain is addressed in the paper. Such structures consist of an assemblage of cantilever columns connected with ties. Considering analogy with cantilever walls, it has been expected that during inelastic response the actual shear forces in multi-storey cantilever columns could be considerably higher than the forces foreseen by traditional equivalent elastic analytical procedures (equivalent lateral force or modal spectrum).
A parametric study of a set of realistic three-storey structures/columns was performed. These structures were designed according to Eurocodes and shear forces were determined by the equivalent elastic (modal spectrum) analysis. Average values of the shear forces obtained by the inelastic response analysis were compared to those of the traditional (modal spectrum) procedure. They were also compared to magnified shear forces predicted using the shear magnification factor ε suggested in Eurocode 8 for RC ductile walls. In parallel, modelling issues related to the inelastic response analysis of multi-storey cantilever columns were also discussed. Very large seismic force magnifications (up to 3 times and more) were observed. Therefore it is essential to account for this phenomenon in the seismic (capacity) design of cantilever columns in multi-storey precast buildings. It was demonstrated that for this purpose the expression given in Eurocode 8 to account for seismic shear magnification in ductile cantilever walls could be used with some minor modifications.

Item Type: Conference Proceedings
Title of Proceedings: Proceedings of the 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Additional Information: COMPDYN 2011. An IACM Special Interest Conference held in Corfu, Greece from 25-28 May 2011.
Uncontrolled Keywords: Seismic shear forces, Shear magnification factor, Multi-storey precast structures, Multi-storey cantilever columns, Eurocode 8
Pre-2014 Departments: School of Engineering > Department of Civil Engineering
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Last Modified: 22 Oct 2020 16:07

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