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<p>This study presents an experimental investigation of the torsional behavior of reinforced concrete (RC) narrow edge beams (NEBs) with slender cross-sections (aspect ratio of 3.0), focusing on the influence of RC slabs and combined flexure-shear-torsion loading. Four full-scale specimens—two isolated NEBs and two NEB-slab substructures—were tested under static loading until failure. Key findings reveal that: (1) NEB-slab systems demonstrated a 173% higher post-cracking torsional capacity compared to isolated NEBs, (2) RC slabs enhanced torsional resistance by restraining inward movement of the upper edge and redistributing internal forces after cracking, and (3) while flexural moments reduced initial cracking torque by 43%, they increased ultimate strength by 32% and improved ductility. The experimental results suggest that adjacent slabs contribute significantly to the torsional capacity, even without closed stirrups, indicating that current code assumptions (ACI318-19 in Building code requirements for structural concrete and commentary. American Concrete Institute, 2019) may be conservative. These findings provide practical insights for designing NEB-slab systems, particularly in cantilevered applications where torsional demands are critical.</p>

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Experimental Investigation on Impact of Reinforced Concrete Slabs and Combined Flexure-Shear-Torsion on Torsional Behaviour of Edge Beams with Narrow Cross-Sections

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Anh Tuan Pham,
  • Van Hung Nguyen,
  • Xuan Dat Pham

摘要

This study presents an experimental investigation of the torsional behavior of reinforced concrete (RC) narrow edge beams (NEBs) with slender cross-sections (aspect ratio of 3.0), focusing on the influence of RC slabs and combined flexure-shear-torsion loading. Four full-scale specimens—two isolated NEBs and two NEB-slab substructures—were tested under static loading until failure. Key findings reveal that: (1) NEB-slab systems demonstrated a 173% higher post-cracking torsional capacity compared to isolated NEBs, (2) RC slabs enhanced torsional resistance by restraining inward movement of the upper edge and redistributing internal forces after cracking, and (3) while flexural moments reduced initial cracking torque by 43%, they increased ultimate strength by 32% and improved ductility. The experimental results suggest that adjacent slabs contribute significantly to the torsional capacity, even without closed stirrups, indicating that current code assumptions (ACI318-19 in Building code requirements for structural concrete and commentary. American Concrete Institute, 2019) may be conservative. These findings provide practical insights for designing NEB-slab systems, particularly in cantilevered applications where torsional demands are critical.