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<p>This study presents a robust numerical modeling approach for simulating the in-plane seismic behavior of reinforced concrete frames with masonry infill walls using a fiber-section-based macro-model implemented in ETABS. The infill walls are modeled as equivalent diagonal compression struts, while RC beams and columns are represented through fiber hinge elements capable of capturing material nonlinearities. The model incorporates stress–strain relationships for confined and unconfined concrete, masonry, and steel reinforcement, enabling an accurate simulation of stiffness degradation and energy dissipation under seismic loads. To validate the numerical strategy, three experimentally tested infilled RC frames with varying infill types calcarenite (S1A), clay masonry (S1B), and lightweight concrete (S1C) were analyzed. Numerical results were compared with experimental force–displacement responses. The comparison revealed that the model closely replicates initial stiffness and peak strength across all cases. However, post-peak behavior was smoother in the simulations due to simplified assumptions that overlook localized failure mechanisms like diagonal cracking and interface debonding. Despite these limitations, the proposed approach effectively captures the global seismic response of infilled frames. The findings confirm the model’s applicability for performance-based seismic assessments of RC structures, especially in preliminary design and retrofit planning where computational efficiency is vital.</p>

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Fiber-based macro-modeling approach for simulating the seismic behavior of reinforced concrete frames with masonry infill walls in ETABS

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Salah Guettala

摘要

This study presents a robust numerical modeling approach for simulating the in-plane seismic behavior of reinforced concrete frames with masonry infill walls using a fiber-section-based macro-model implemented in ETABS. The infill walls are modeled as equivalent diagonal compression struts, while RC beams and columns are represented through fiber hinge elements capable of capturing material nonlinearities. The model incorporates stress–strain relationships for confined and unconfined concrete, masonry, and steel reinforcement, enabling an accurate simulation of stiffness degradation and energy dissipation under seismic loads. To validate the numerical strategy, three experimentally tested infilled RC frames with varying infill types calcarenite (S1A), clay masonry (S1B), and lightweight concrete (S1C) were analyzed. Numerical results were compared with experimental force–displacement responses. The comparison revealed that the model closely replicates initial stiffness and peak strength across all cases. However, post-peak behavior was smoother in the simulations due to simplified assumptions that overlook localized failure mechanisms like diagonal cracking and interface debonding. Despite these limitations, the proposed approach effectively captures the global seismic response of infilled frames. The findings confirm the model’s applicability for performance-based seismic assessments of RC structures, especially in preliminary design and retrofit planning where computational efficiency is vital.