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<p>Beam-column joints are a crucial area in reinforced concrete (RC) structures, and they play a major role in the structure's design and construction phases. The dynamic response is strongly influenced by the shape of the blast pressure–time pulse, making its consideration critical in structural assessment. This study examines the response of a five-story RC frame subjected to different blast pulse shapes using nonlinear time-history analysis of a detailed finite element model. Buckling-Restrained Braces (BRBs) were introduced to enhance structural resilience and energy dissipation. Results show that concave and half-sine pulses produced the most critical responses, particularly at the front façade. The inclusion of BRBs improved the initial stiffness by 106% (BRB-1) and 349% (BRB-2) compared to the bare frame, while reducing post-yield stiffness degradation by more than 39% and 99%, respectively. These findings demonstrate the significant potential of BRBs in mitigating blast effects and highlight the novelty of evaluating multiple pulse shapes combined with BRB implementation for designing blast-resilient RC structures.</p>

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Effect of various blast load pulse shapes on RC frame structures: mitigation through buckling-restrained braces

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Mohamed Selim,
  • Mohamed Metwaly,
  • Eman Elshamy,
  • Mohamed Emara

摘要

Beam-column joints are a crucial area in reinforced concrete (RC) structures, and they play a major role in the structure's design and construction phases. The dynamic response is strongly influenced by the shape of the blast pressure–time pulse, making its consideration critical in structural assessment. This study examines the response of a five-story RC frame subjected to different blast pulse shapes using nonlinear time-history analysis of a detailed finite element model. Buckling-Restrained Braces (BRBs) were introduced to enhance structural resilience and energy dissipation. Results show that concave and half-sine pulses produced the most critical responses, particularly at the front façade. The inclusion of BRBs improved the initial stiffness by 106% (BRB-1) and 349% (BRB-2) compared to the bare frame, while reducing post-yield stiffness degradation by more than 39% and 99%, respectively. These findings demonstrate the significant potential of BRBs in mitigating blast effects and highlight the novelty of evaluating multiple pulse shapes combined with BRB implementation for designing blast-resilient RC structures.