<p>This study aims to evaluate the effectiveness of a macro fiber bond-slip model in predicting the structural behavior of reinforced concrete columns. The primary objective is to assess the model's capability to replicate global structural behavior, with a specific focus on lateral load versus top displacement, by comparing analytical predictions to experimental data reported in existing literature. The analytical model was assessed by comparing its predictions against experimental data from column tests conducted by eight independent research groups. These tests encompassed a wide variety of column configurations, including with and without hooks, insufficient lap splices, as well as continuous longitudinal rebars. Due to limited availability of localized response measurements and detailed digital data, the comparison focused on global responses specifically, the relationship between lateral load and top displacement. The macro fiber bond-slip model demonstrated good agreement with experimental observations in terms of lateral load capacity, initial stiffness, ductility, and failure modes associated with flexural and bond-slip mechanisms. However, the model exhibited limitations in accurately replicating pinching effects, cyclic degradation, and post-peak behavior, particularly in columns without lap splices and those reinforced with plain bars and 180-degree hooks. Further refinement is necessary for improved accuracy in modeling columns with plain bars and specific detailing features.</p>

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Effectiveness of macro fiber bond slip model responses of lap-spliced reinforced concrete columns

  • Sharmin Reza Chowdhury,
  • Md. Fazla Rabbi Anik,
  • Kutay Orakcal

摘要

This study aims to evaluate the effectiveness of a macro fiber bond-slip model in predicting the structural behavior of reinforced concrete columns. The primary objective is to assess the model's capability to replicate global structural behavior, with a specific focus on lateral load versus top displacement, by comparing analytical predictions to experimental data reported in existing literature. The analytical model was assessed by comparing its predictions against experimental data from column tests conducted by eight independent research groups. These tests encompassed a wide variety of column configurations, including with and without hooks, insufficient lap splices, as well as continuous longitudinal rebars. Due to limited availability of localized response measurements and detailed digital data, the comparison focused on global responses specifically, the relationship between lateral load and top displacement. The macro fiber bond-slip model demonstrated good agreement with experimental observations in terms of lateral load capacity, initial stiffness, ductility, and failure modes associated with flexural and bond-slip mechanisms. However, the model exhibited limitations in accurately replicating pinching effects, cyclic degradation, and post-peak behavior, particularly in columns without lap splices and those reinforced with plain bars and 180-degree hooks. Further refinement is necessary for improved accuracy in modeling columns with plain bars and specific detailing features.