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Theoretical investigation of the structural performance of multi–span reinforced concrete beams strengthened with FRCM systems
Abstract Few studies have reported on the flexural behavior of multi–span reinforced concrete (RC) structures strengthened using externally–bonded (EB) systems such as fiber–reinforced polymer (FRP) and fiber–reinforced cementitious matrix (FRCM) systems. This paper introduces a theoretical model that can accurately predict the flexural behavior of such structures with a focus on their rotational capacity (curvature) and their moment redistribution response between critical sections. Unlike the available models, the proposed model accounts for the variation in the structure’s stiffness during loading including that of the strengthened section. The model can precisely determine the failure mode, the rotational capacity of the formed plastic hinges and estimate the moment redistribution ratio (MRR) between the critical sections at any applied load. The efficiency of the model was validated against the experimental results of eleven FRCM–strengthened two–span RC beams (including two control beams) previously tested by the authors. A good agreement between the experimental and the theoretical results was obtained with average experimental–to–theoretical ratios of 1.0 and 0.99 for the load carrying–capacity and MRR, respectively. To accurately determine the mid–span deflections of continuous EB–strengthened structures, a new reduction parameter was incorporated in the CSA–A23.3–19 (2019) formulations to account for the variation in stiffness of the strengthened section. The new formulations substantially enhanced the prediction of the deflection capacity of the strengthened structures with an average experimental–to–theoretical ratio of 1.02 versus 1.7 when CSA formulations were used.
Highlights New model is proposed to predict the nonlinear flexural behavior of multispan RC structures strengthened using FRCM systems. The model was validated against experimental results previously tested by the authors. The model accurately predicted the moment capacity and the moment redistribution ratios of all beams. New deflection parameter is incorporated in the CSA equation to account for stiffness variation due to strengthening.
Theoretical investigation of the structural performance of multi–span reinforced concrete beams strengthened with FRCM systems
Abstract Few studies have reported on the flexural behavior of multi–span reinforced concrete (RC) structures strengthened using externally–bonded (EB) systems such as fiber–reinforced polymer (FRP) and fiber–reinforced cementitious matrix (FRCM) systems. This paper introduces a theoretical model that can accurately predict the flexural behavior of such structures with a focus on their rotational capacity (curvature) and their moment redistribution response between critical sections. Unlike the available models, the proposed model accounts for the variation in the structure’s stiffness during loading including that of the strengthened section. The model can precisely determine the failure mode, the rotational capacity of the formed plastic hinges and estimate the moment redistribution ratio (MRR) between the critical sections at any applied load. The efficiency of the model was validated against the experimental results of eleven FRCM–strengthened two–span RC beams (including two control beams) previously tested by the authors. A good agreement between the experimental and the theoretical results was obtained with average experimental–to–theoretical ratios of 1.0 and 0.99 for the load carrying–capacity and MRR, respectively. To accurately determine the mid–span deflections of continuous EB–strengthened structures, a new reduction parameter was incorporated in the CSA–A23.3–19 (2019) formulations to account for the variation in stiffness of the strengthened section. The new formulations substantially enhanced the prediction of the deflection capacity of the strengthened structures with an average experimental–to–theoretical ratio of 1.02 versus 1.7 when CSA formulations were used.
Highlights New model is proposed to predict the nonlinear flexural behavior of multispan RC structures strengthened using FRCM systems. The model was validated against experimental results previously tested by the authors. The model accurately predicted the moment capacity and the moment redistribution ratios of all beams. New deflection parameter is incorporated in the CSA equation to account for stiffness variation due to strengthening.
Theoretical investigation of the structural performance of multi–span reinforced concrete beams strengthened with FRCM systems
Mandor, Ahmed (author) / El Refai, Ahmed (author)
Engineering Structures ; 308
2024-04-04
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2009