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<p>Poor performance of beam–column joints during recent earthquakes has highlighted the vulnerability of reinforced concrete (RC) moment-resisting frames due to the weakness of concrete under strain and shear. A three-dimensional (3D) finite-element (FE) analysis of a precast RC beam–column joint is conducted, incorporating properties for engineered cementitious composites (ECC) behavior, and the results are validated against experimental data. The potential of replacing concrete in the joint region with ECC, known for its pseudo-strain-hardening and multiple cracking behavior, was investigated. Results show that ECC enhances load capacity, deformation tolerance, and damage resilience compared to conventional concrete, with minimal degradation in strength and stiffness. Two parametric studies were conducted with the FE model. The first study highlights the importance of transverse reinforcement, showing that ECC alone is insufficient to prevent shear failure. The second study reveals that ECC improves seismic performance within the plastic hinge region but offers limited benefits beyond this zone due to maximum bending and plastic deformation. Findings suggest that ECC should be used strategically in critical areas to optimize performance and cost-effectiveness. To achieve a practical improvement in the design, the steel corbel section is proposed to carry 70% of the shear force at the end of the beam.</p>

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Numerical study of seismic performance of RC beam-column joints enhanced with ECC and subjected to monotonic loading

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Muhammad Usama Aslam,
  • Muhammad Akbar,
  • Hassan Ayaz,
  • Nejib Ghazouani,
  • Mohammad Arsalan Khan,
  • Abdullah Naser M Asiri,
  • Saiful Islam

摘要

Poor performance of beam–column joints during recent earthquakes has highlighted the vulnerability of reinforced concrete (RC) moment-resisting frames due to the weakness of concrete under strain and shear. A three-dimensional (3D) finite-element (FE) analysis of a precast RC beam–column joint is conducted, incorporating properties for engineered cementitious composites (ECC) behavior, and the results are validated against experimental data. The potential of replacing concrete in the joint region with ECC, known for its pseudo-strain-hardening and multiple cracking behavior, was investigated. Results show that ECC enhances load capacity, deformation tolerance, and damage resilience compared to conventional concrete, with minimal degradation in strength and stiffness. Two parametric studies were conducted with the FE model. The first study highlights the importance of transverse reinforcement, showing that ECC alone is insufficient to prevent shear failure. The second study reveals that ECC improves seismic performance within the plastic hinge region but offers limited benefits beyond this zone due to maximum bending and plastic deformation. Findings suggest that ECC should be used strategically in critical areas to optimize performance and cost-effectiveness. To achieve a practical improvement in the design, the steel corbel section is proposed to carry 70% of the shear force at the end of the beam.