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<p>Revealing the degradation mechanism of the seismic performance of corroded RC coupling beam (CRCCB) is crucial for assessing the seismic capacity of in-service RC shear wall structures. This study conducted quasi-static tests on four CRCCB specimens, thoroughly discussing the differences in failure modes and mechanical properties under varying degrees of corrosion and span-depth ratios. The experimental results indicate that corrosion significantly reduces the load-bearing capacity, deformation capacity, and energy dissipation capacity of RC coupling beams. The corroded specimens exhibit more pronounced shear failure characteristics, with more sudden failures and reduced shear capacity. At similar corrosion levels, as the span-depth ratio increases, the load-bearing capacity decreases, while the ductility and energy dissipation capacity increase. The impact of corrosion is more significant for specimens with smaller span-depth ratios. Additionally, a numerical model of CRCCB was established using ABAQUS, incorporating the effects of material corrosion. A multi-parameter study of CRCCB was conducted based on an effective numerical modeling method.</p>

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Experimental and numerical simulation studies on the seismic performance of corroded RC coupling beam (CRCCB) with diagonal bars

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Yahui Li,
  • Shansuo Zheng,
  • Deliang Wang,
  • Liguo Dong

摘要

Revealing the degradation mechanism of the seismic performance of corroded RC coupling beam (CRCCB) is crucial for assessing the seismic capacity of in-service RC shear wall structures. This study conducted quasi-static tests on four CRCCB specimens, thoroughly discussing the differences in failure modes and mechanical properties under varying degrees of corrosion and span-depth ratios. The experimental results indicate that corrosion significantly reduces the load-bearing capacity, deformation capacity, and energy dissipation capacity of RC coupling beams. The corroded specimens exhibit more pronounced shear failure characteristics, with more sudden failures and reduced shear capacity. At similar corrosion levels, as the span-depth ratio increases, the load-bearing capacity decreases, while the ductility and energy dissipation capacity increase. The impact of corrosion is more significant for specimens with smaller span-depth ratios. Additionally, a numerical model of CRCCB was established using ABAQUS, incorporating the effects of material corrosion. A multi-parameter study of CRCCB was conducted based on an effective numerical modeling method.