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<p>Reinforced concrete (RC) shear walls are extensively utilized in high-rise and super high-rise buildings owing to their superior lateral load-bearing capacity and overall structural integrity. However, in practical engineering applications, deficiencies in construction management or inadequate quality control of materials may lead to localized reductions in concrete strength, which can compromise the continuity of the load transfer path and reduce structural performance. To address this issue, this study proposes a local rehabilitation technique using self-stressed high-strength concrete (SHSC) bands. In this approach, deficient concrete is partially replaced, and vertical SHSC bands are installed along the wall height to restore the load transfer continuity between the repaired and existing concrete. In contrast to conventional global strengthening or section enlargement approaches, the proposed technique targets locally deficient regions through a minimally invasive intervention, thereby preserving the integrity of the original structure. The novelty of this study lies in the development of the SHSC band-based rehabilitation strategy and the experimental elucidation of its effects on strength recovery, stiffness, ductility, and interface behavior in full-scale shear wall specimens. To evaluate the effectiveness of the proposed method, four full-scale RC shear wall specimens were designed and fabricated. Three specimens were tested under monotonic static loading, while one strengthened specimen was additionally subjected to low-cycle reversed loading to provide a preliminary assessment of cyclic behavior. The experimental results show that the SHSC-strengthened walls exhibit an increase in peak load capacity of approximately 8.76–11.00% compared with the unstrengthened control specimen. The strengthening bands lead to a moderate increase in initial lateral stiffness (approximately 11.95–14.48%) and monotonic energy dissipation capacity, with a maximum increase of 17.90%, while a reduction in ductility is observed when the bands are embedded within the boundary element region. Among the investigated configurations, placing the SHSC bands on the inner side of the concealed columns provides a balanced improvement in strength and deformation capacity. Overall, the proposed SHSC band strengthening method provides a practical engineering solution for restoring the load-bearing capacity of RC shear walls with localized concrete strength deficiencies, rather than serving as a comprehensive seismic upgrading technique. The method is particularly suitable for local rehabilitation scenarios in which global strengthening is unnecessary or impractical.</p>

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Experimental investigation on local rehabilitation of RC shear walls with deficient concrete using self-stressed high-strength concrete bands

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Jiwen Zhang,
  • Xing Li,
  • Pinxie Zhang,
  • Hongyin Xiao,
  • Yuchao Yang

摘要

Reinforced concrete (RC) shear walls are extensively utilized in high-rise and super high-rise buildings owing to their superior lateral load-bearing capacity and overall structural integrity. However, in practical engineering applications, deficiencies in construction management or inadequate quality control of materials may lead to localized reductions in concrete strength, which can compromise the continuity of the load transfer path and reduce structural performance. To address this issue, this study proposes a local rehabilitation technique using self-stressed high-strength concrete (SHSC) bands. In this approach, deficient concrete is partially replaced, and vertical SHSC bands are installed along the wall height to restore the load transfer continuity between the repaired and existing concrete. In contrast to conventional global strengthening or section enlargement approaches, the proposed technique targets locally deficient regions through a minimally invasive intervention, thereby preserving the integrity of the original structure. The novelty of this study lies in the development of the SHSC band-based rehabilitation strategy and the experimental elucidation of its effects on strength recovery, stiffness, ductility, and interface behavior in full-scale shear wall specimens. To evaluate the effectiveness of the proposed method, four full-scale RC shear wall specimens were designed and fabricated. Three specimens were tested under monotonic static loading, while one strengthened specimen was additionally subjected to low-cycle reversed loading to provide a preliminary assessment of cyclic behavior. The experimental results show that the SHSC-strengthened walls exhibit an increase in peak load capacity of approximately 8.76–11.00% compared with the unstrengthened control specimen. The strengthening bands lead to a moderate increase in initial lateral stiffness (approximately 11.95–14.48%) and monotonic energy dissipation capacity, with a maximum increase of 17.90%, while a reduction in ductility is observed when the bands are embedded within the boundary element region. Among the investigated configurations, placing the SHSC bands on the inner side of the concealed columns provides a balanced improvement in strength and deformation capacity. Overall, the proposed SHSC band strengthening method provides a practical engineering solution for restoring the load-bearing capacity of RC shear walls with localized concrete strength deficiencies, rather than serving as a comprehensive seismic upgrading technique. The method is particularly suitable for local rehabilitation scenarios in which global strengthening is unnecessary or impractical.