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<p>This study presents the first probabilistic safety assessment of reinforced concrete (RC) corbels designed using the shear-friction (SF) approach and the strut-and-tie model (STM) in accordance with the ACI 318–19 code. A comprehensive database comprising 219 double-sided corbel specimens was compiled, focusing exclusively on specimens constructed with normal-weight concrete and conventional steel reinforcement that comply with ACI 318–19 requirements. The study investigates the influence of triaxial confinement and back-face strength checks for CCT nodes on the predictive performance of the STM, as well as the effect of large column dimensions on both the SF and STM approaches. The reliability of the SF and STM design methods was assessed using Monte Carlo simulations, incorporating uncertainties in material properties, applied loads, and model prediction accuracy, with a target safety index of 3.5. Based on the analysis, a revised resistance factor of 0.65 is recommended for the SF method when applied to normal-strength concrete, whereas the existing resistance factor of 0.75 remains appropriate for the STM method across both normal- and high-strength concrete, as well as for the SF method when applied to high-strength concrete. This research contributes to the development of more reliable design methodologies for RC corbels, ensuring adequate safety levels in structural engineering practice.</p>

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Probabilistic safety assessment of the shear-friction and strut-and-tie methods for designing reinforced-concrete corbels according to ACI 318–19

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Duangtida Muendacha,
  • Cherdchoo Sinchai,
  • Jaruek Teerawong,
  • Panatchai Chetchotisak,
  • Chayanon Hansapinyo

摘要

This study presents the first probabilistic safety assessment of reinforced concrete (RC) corbels designed using the shear-friction (SF) approach and the strut-and-tie model (STM) in accordance with the ACI 318–19 code. A comprehensive database comprising 219 double-sided corbel specimens was compiled, focusing exclusively on specimens constructed with normal-weight concrete and conventional steel reinforcement that comply with ACI 318–19 requirements. The study investigates the influence of triaxial confinement and back-face strength checks for CCT nodes on the predictive performance of the STM, as well as the effect of large column dimensions on both the SF and STM approaches. The reliability of the SF and STM design methods was assessed using Monte Carlo simulations, incorporating uncertainties in material properties, applied loads, and model prediction accuracy, with a target safety index of 3.5. Based on the analysis, a revised resistance factor of 0.65 is recommended for the SF method when applied to normal-strength concrete, whereas the existing resistance factor of 0.75 remains appropriate for the STM method across both normal- and high-strength concrete, as well as for the SF method when applied to high-strength concrete. This research contributes to the development of more reliable design methodologies for RC corbels, ensuring adequate safety levels in structural engineering practice.