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<p>In construction projects, the need to create openings in reinforced concrete (RC) beams for electrical, mechanical passages, and other purposes has increased. These openings negatively impact the strength and stiffness of these beams. Additionally, with advancements in concrete technology, producing high-strength concrete has become easy. While many researchers have extensively examined the behaviour of RC beams strengthened by various methods, fewer studies have focused on the behaviour of beams with large openings in the flexure zones that are externally strengthened with different techniques. Therefore, this research aims to investigate the behaviour of RC beams with large rectangular openings in flexure zones that are strengthened with ultra-high-strength concrete (UHSC) layers under cyclic loads and to assess the effectiveness of using external UHSC strips for strengthening existing RC beams with large web openings. A nonlinear finite element (FE) analysis was performed on nineteen models of RC beams with and without rectangular openings, strengthened with UHSC layers of varying thicknesses, 10, 20, 30, 40, and 50&#xa0;mm, and widths (50 and 75&#xa0;mm) applied externally on both sides of the openings. The results showed that using UHSC layers of varying thicknesses (10, 30, 40, and 50&#xa0;mm) with a constant width of 75&#xa0;mm, increased the ultimate loads from 6.97% to 54.67% for beam SBO1 and from 34.83% to 105% for beam SBO4. Similarly, layers of 20&#xa0;mm thickness and 50&#xa0;mm width increased the ultimate loads by about 30.71% for SBO1 and 54.64% for SBO4.</p>

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Finite element investigation of reinforced concrete beams with openings strengthened with ultra high strength concrete

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Mohamed Abd-Elrhman Nafe,
  • Nader Mohamed Abd-Alkhalik,
  • Mohamed Kamel Abd-Elhamed

摘要

In construction projects, the need to create openings in reinforced concrete (RC) beams for electrical, mechanical passages, and other purposes has increased. These openings negatively impact the strength and stiffness of these beams. Additionally, with advancements in concrete technology, producing high-strength concrete has become easy. While many researchers have extensively examined the behaviour of RC beams strengthened by various methods, fewer studies have focused on the behaviour of beams with large openings in the flexure zones that are externally strengthened with different techniques. Therefore, this research aims to investigate the behaviour of RC beams with large rectangular openings in flexure zones that are strengthened with ultra-high-strength concrete (UHSC) layers under cyclic loads and to assess the effectiveness of using external UHSC strips for strengthening existing RC beams with large web openings. A nonlinear finite element (FE) analysis was performed on nineteen models of RC beams with and without rectangular openings, strengthened with UHSC layers of varying thicknesses, 10, 20, 30, 40, and 50 mm, and widths (50 and 75 mm) applied externally on both sides of the openings. The results showed that using UHSC layers of varying thicknesses (10, 30, 40, and 50 mm) with a constant width of 75 mm, increased the ultimate loads from 6.97% to 54.67% for beam SBO1 and from 34.83% to 105% for beam SBO4. Similarly, layers of 20 mm thickness and 50 mm width increased the ultimate loads by about 30.71% for SBO1 and 54.64% for SBO4.