Scholarlink

<p>The reinforced concrete (RC) beams containing post-cast openings are commonly adopted to accommodate mechanical, electrical, and plumbing (MEP) installations. However, such openings interrupt stress distribution and often diminish load-bearing capacity and ductility. This research explores the performance of RC beams with rectangular and rounded rectangular web openings strengthened using Carbon Fiber Reinforced Polymer (CFRP). A total of 27 specimens were analyzed, including solid control beams and those with varying opening geometries and CFRP layouts. The reference beam (SB) sustained a maximum load of 117.8 kN, while the unstrengthened rectangular specimen (R-NO) supported only 76.9 kN. The beams with rounded openings displayed improved behavior, and the CFRP-upgraded RR-IU beam regained a capacity of 105.7 kN, approximately 90% of the SB. Energy dissipation showed parallel results: SB recorded 0.2043 kNm·rad/m; R-NO declined to 0.0813 kNm·rad/m; and RR-IU recovered to 0.1756 kNm·rad/m, equal to nearly 86% of SB. An Artificial Neural Network (ANN) with eleven structural parameters was developed to estimate energy absorption, achieving R² = 0.94 and RMSE = 0.0054, indicating strong predictive efficiency. The sensitivity analysis identified ultimate load, stiffness, and deflection as the most influential parameters. The economic evaluation confirmed the feasibility of CFRP retrofitting, with the combined internal and U-wrap (RR-IU) configuration demonstrating optimal cost-to-performance recovery. This integrated framework, blending experimental analysis, statistical validation, and ANN modeling, establishes that rounded rectangular openings retrofitted with CFRP can restore up to 90% of structural capacity while remaining cost-effective.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental and ANN-Based Evaluation of CFRP-Retrofitted RC Beams with Core-Cut Openings

  • 期刊论文

  • 发表日期：

    2026年2月9日

查看全文
  • Tahera,
  • Neethu Urs

摘要

The reinforced concrete (RC) beams containing post-cast openings are commonly adopted to accommodate mechanical, electrical, and plumbing (MEP) installations. However, such openings interrupt stress distribution and often diminish load-bearing capacity and ductility. This research explores the performance of RC beams with rectangular and rounded rectangular web openings strengthened using Carbon Fiber Reinforced Polymer (CFRP). A total of 27 specimens were analyzed, including solid control beams and those with varying opening geometries and CFRP layouts. The reference beam (SB) sustained a maximum load of 117.8 kN, while the unstrengthened rectangular specimen (R-NO) supported only 76.9 kN. The beams with rounded openings displayed improved behavior, and the CFRP-upgraded RR-IU beam regained a capacity of 105.7 kN, approximately 90% of the SB. Energy dissipation showed parallel results: SB recorded 0.2043 kNm·rad/m; R-NO declined to 0.0813 kNm·rad/m; and RR-IU recovered to 0.1756 kNm·rad/m, equal to nearly 86% of SB. An Artificial Neural Network (ANN) with eleven structural parameters was developed to estimate energy absorption, achieving R² = 0.94 and RMSE = 0.0054, indicating strong predictive efficiency. The sensitivity analysis identified ultimate load, stiffness, and deflection as the most influential parameters. The economic evaluation confirmed the feasibility of CFRP retrofitting, with the combined internal and U-wrap (RR-IU) configuration demonstrating optimal cost-to-performance recovery. This integrated framework, blending experimental analysis, statistical validation, and ANN modeling, establishes that rounded rectangular openings retrofitted with CFRP can restore up to 90% of structural capacity while remaining cost-effective.