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.
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The authors would like to extend their sincere gratitude and appreciation to the institution Hehai University and KUST for its support and resources provided for this research.
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Wahab, A.G., Zhong, T., Wei, F. et al. Seismic performance enhancement of RC framed structures through retrofitting and strengthening: an experimental and numerical study. Asian J Civ Eng 25, 555–573 (2024). https://doi.org/10.1007/s42107-023-00794-z
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DOI: https://doi.org/10.1007/s42107-023-00794-z