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<p>This experimental study, performed at Cairo University’s Structural Laboratory, examined how vertical shear reinforcement affects the punching shear resistance of reinforced concrete flat slabs, punching shear is a critical failure mechanism around columns, influenced by concrete strength, flexural reinforcement, and the arrangement of shear reinforcement. The experimental program involved testing seven full-scale specimens (1000 × 1000 × 160&#xa0;mm) monolithically cast with a central 150&#xa0;mm square column and simply supported on a 900&#xa0;mm span. Key test variables were the diameter, number of branches, and layout configuration of the shear stirrups. By monitoring deflection, steel strain, and ultimate load, the study determined that the punching shear capacity increased significantly with the use of larger-diameter stirrups and a higher number of branches. These results were analyzed in the context of predictions from major international design codes.</p>

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Effect of shear reinforcement parameters on the punching shear capacity of RC flat slabs: comparison with design codes

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Mahmoud M. Elnahla,
  • Hany A. Abdalla

摘要

This experimental study, performed at Cairo University’s Structural Laboratory, examined how vertical shear reinforcement affects the punching shear resistance of reinforced concrete flat slabs, punching shear is a critical failure mechanism around columns, influenced by concrete strength, flexural reinforcement, and the arrangement of shear reinforcement. The experimental program involved testing seven full-scale specimens (1000 × 1000 × 160 mm) monolithically cast with a central 150 mm square column and simply supported on a 900 mm span. Key test variables were the diameter, number of branches, and layout configuration of the shear stirrups. By monitoring deflection, steel strain, and ultimate load, the study determined that the punching shear capacity increased significantly with the use of larger-diameter stirrups and a higher number of branches. These results were analyzed in the context of predictions from major international design codes.