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Seismic performance enhancement of RC framed structures through retrofitting and strengthening: an experimental and numerical study

Seismic performance enhancement of RC framed structures through retrofitting and strengthening:... This study investigates the seismic performance of a two-bay, two-story reinforced concrete (RC) framed structure and proposes a retrofitting strategy by removing a column and strengthening the adjoining beams and columns using RC jacketing and post-tensioning tendons. Experimental testing and numerical simulations are conducted to assess the effectiveness of the retrofitting method. The experimental results indicate that the retrofitted RC frame exhibits enhanced lateral stiffness and shear force resistance, resulting in reduced shear deformation compared to the existing RC frame. However, the two frames’ ductility and energy dissipation characteristics remain similar. Notably, failure in the retrofitted frame occurs primarily in the second-story beam–column joint, whereas the original frame experiences failure at the ground-floor beam–column joints. Furthermore, a numerical macro-based finite element model is developed in OpenSEES, validated with experimental data, and utilized for a parametric study. The numerical findings suggest that retrofitting is suitable when the axial compression ratio of the second story’s side columns is kept below 0.52. Attention should be given to the size of the retrofitted columns to avoid compromising the upper floor’s structural integrity, as the retrofitting process may result in a softer upper floor. It is essential to regulate the dimensions of retrofitted columns and ensure that the elastic lateral stiffness of the retrofitted story is greater than the upper story. In this case, a 350 and 300 mm column depth had acceptable performance. Overall, this study provides valuable insights into the seismic performance of retrofitted RC-framed structures. The findings emphasize the importance of appropriate column sizing and maintaining adequate lateral stiffness to enhance retrofitted buildings’ structural integrity and seismic resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Asian Journal of Civil Engineering Springer Journals

Seismic performance enhancement of RC framed structures through retrofitting and strengthening: an experimental and numerical study

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References (34)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1563-0854
eISSN
2522-011X
DOI
10.1007/s42107-023-00794-z
Publisher site
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Abstract

This study investigates the seismic performance of a two-bay, two-story reinforced concrete (RC) framed structure and proposes a retrofitting strategy by removing a column and strengthening the adjoining beams and columns using RC jacketing and post-tensioning tendons. Experimental testing and numerical simulations are conducted to assess the effectiveness of the retrofitting method. The experimental results indicate that the retrofitted RC frame exhibits enhanced lateral stiffness and shear force resistance, resulting in reduced shear deformation compared to the existing RC frame. However, the two frames’ ductility and energy dissipation characteristics remain similar. Notably, failure in the retrofitted frame occurs primarily in the second-story beam–column joint, whereas the original frame experiences failure at the ground-floor beam–column joints. Furthermore, a numerical macro-based finite element model is developed in OpenSEES, validated with experimental data, and utilized for a parametric study. The numerical findings suggest that retrofitting is suitable when the axial compression ratio of the second story’s side columns is kept below 0.52. Attention should be given to the size of the retrofitted columns to avoid compromising the upper floor’s structural integrity, as the retrofitting process may result in a softer upper floor. It is essential to regulate the dimensions of retrofitted columns and ensure that the elastic lateral stiffness of the retrofitted story is greater than the upper story. In this case, a 350 and 300 mm column depth had acceptable performance. Overall, this study provides valuable insights into the seismic performance of retrofitted RC-framed structures. The findings emphasize the importance of appropriate column sizing and maintaining adequate lateral stiffness to enhance retrofitted buildings’ structural integrity and seismic resistance.

Journal

Asian Journal of Civil Engineering – Springer Journals

Published: Jun 30, 2023

Keywords: Structural retrofitting; Strengthening; RC frame; Column removal; Post-tensioning; Crack pattern; Numerical simulation

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