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<p>This study explores the impact of compression reinforcement on the shear behavior of reinforced concrete beams through experimental investigation. Nine RC beams were categorized into three series and tested under three-point loading with a shear-span-to-depth ratio of 2.52. Series I and II lacked shear reinforcement, while Series III included stirrups. The longitudinal tension reinforcement ratio was set at 0.0157 and 0.0184, while the longitudinal compression reinforcement ratio varied (0, 0.0069, 0.0157, 0.0184), with a concrete compressive strength of 30&#xa0;MPa. Results revealed that compression reinforcement significantly enhanced shear strength, with beams without shear reinforcement achieving up to 29.79% higher maximum load capacity, peaking at 153.66 kN for specimen T1-C2-NS, compared to 118.39 kN in the reference beam T1-C0-NS. Beams with stirrups exhibited less enhancement, with a maximum load capacity of 203 kN (4.79% increase compared to 193.38 kN in singly reinforced beams T1-C0-S). Strain measurements showed that compression reinforcement improved stress redistribution and delayed crack propagation, where specimenT1-C2-NS achieved a 57% reduction in critical shear zone strain (from 0.002169&#xa0;mm/mm to 0.000929&#xa0;mm/mm). The comparison with ACI 318 − 19 predictions demonstrated that the experimental shear strength of T1-C2-NS was 2.59 times greater than theoretical estimates, highlighting the conservative nature of the code’s shear strength calculations, especially for beams without shear reinforcement. Compression reinforcement effectively delayed shear failure, reduced crack propagation, and improved load capacity and stiffness. Further investigations are recommended to explore the compression reinforcement effect at different shear-span-to-depth ratios.</p>

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Influence of compression reinforcement on shear strength and failure modes in reinforced concrete beams

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Muhammed Jasim Awad,
  • M. Mohammed Rasheed

摘要

This study explores the impact of compression reinforcement on the shear behavior of reinforced concrete beams through experimental investigation. Nine RC beams were categorized into three series and tested under three-point loading with a shear-span-to-depth ratio of 2.52. Series I and II lacked shear reinforcement, while Series III included stirrups. The longitudinal tension reinforcement ratio was set at 0.0157 and 0.0184, while the longitudinal compression reinforcement ratio varied (0, 0.0069, 0.0157, 0.0184), with a concrete compressive strength of 30 MPa. Results revealed that compression reinforcement significantly enhanced shear strength, with beams without shear reinforcement achieving up to 29.79% higher maximum load capacity, peaking at 153.66 kN for specimen T1-C2-NS, compared to 118.39 kN in the reference beam T1-C0-NS. Beams with stirrups exhibited less enhancement, with a maximum load capacity of 203 kN (4.79% increase compared to 193.38 kN in singly reinforced beams T1-C0-S). Strain measurements showed that compression reinforcement improved stress redistribution and delayed crack propagation, where specimenT1-C2-NS achieved a 57% reduction in critical shear zone strain (from 0.002169 mm/mm to 0.000929 mm/mm). The comparison with ACI 318 − 19 predictions demonstrated that the experimental shear strength of T1-C2-NS was 2.59 times greater than theoretical estimates, highlighting the conservative nature of the code’s shear strength calculations, especially for beams without shear reinforcement. Compression reinforcement effectively delayed shear failure, reduced crack propagation, and improved load capacity and stiffness. Further investigations are recommended to explore the compression reinforcement effect at different shear-span-to-depth ratios.