Influence of Confined Concrete Models on the Seismic Response of RC Frames
Hüseyin Bilgin*, Bredli Plaku
Department of Civil Engineering, EPOKA University, Tirana, 1039, Albania
* Corresponding Author: Hüseyin Bilgin. Email: 
Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2024.048645
Received 13 December 2023; Accepted 13 March 2024; Published online 16 April 2024
Abstract
In this study, the influence of confined concrete models on the response of reinforced concrete structures is investigated at member and global system levels. The commonly encountered concrete models such as Modified Kent-Park, Saatçioğlu-Razvi, and Mander are considered. Two moment-resisting frames designed according to the pre-modern code are taken into consideration to reflect the example of an RC moment-resisting frame in the current building stock. The building is in an earthquake-prone zone located on Z3 Soil Type. The inelastic response of the building frame is modelled by considering the plastic hinges formed on each beam and column element for different concrete classes and stirrups spacings. The models are subjected to non-linear static analyses. The differences between confined concrete models are comparatively investigated at both reinforced concrete member and system levels. Based on the results of the comparative analysis, it is revealed that the column behaviour is mostly influenced by the choice of model, due to axial loads and confinement effects, while the beams are less affected, and also it is observed that the differences exhibited in the moment-curvature response of column cross-sections do not significantly affect the overall behaviour of the global system. This highlights the critical role of model selection relative to the concrete strength and stirrup spacing of the member.
Keywords
Non-linear static analysis; moment-curvature relationships; plastic hinges; concrete confinement models; seismic action
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