Abstract
The behaviour of reinforced concrete (RC) columns under increasing axial load and/or lateral deformation due to the seismic response of the structure, is investigated numerically considering second-order effects and their influence on the building performance. The analyses were performed with the OpenSees software, using finite elements (FE) modeling distributed damage both along the section width (fiber model) and along the column length (control sections), considering large deformations. Initially, the reliability of the modeling approach is demonstrated through verification of test results of slender column under similar loading conditions. Subsequently, the behavior of the equivalent cantilever column, which is adopted in Eurocode 2 design for large deformation effects is investigated; two alternative methods are proposed – with corresponding design nomograms being developed, for the design and capacity assessment of slender columns under seismic loading. Finally, a typical existing RC building with a tall ground floor is analyzed, both under inelastic static analysis and time integration dynamic analyses, in order to demonstrate the influence of second order deformations to the response.
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Zeris, C., Leondaris, A. (2023). Numerical Investigation of the Seismic Performance of RC Columns and Entire Buildings Including Second Order Effects. In: Di Trapani, F., Demartino, C., Marano, G.C., Monti, G. (eds) Proceedings of the 2022 Eurasian OpenSees Days. EOS 2022. Lecture Notes in Civil Engineering, vol 326. Springer, Cham. https://doi.org/10.1007/978-3-031-30125-4_4
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