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<p>This study aims to enhance the predictive accuracy of punching shear strength in reinforced concrete flat slabs by refining constitutive laws of concrete through the integration of key material properties. Specifically, compressive strength, tensile strength, and fracture energy parameters are intrinsically linked to aggregate characteristics, are incorporated due to their significant influence on inclined shear crack surface roughness and aggregate interlock governing shear transfer mechanisms. Two modified constitutive laws were refined based on insights from existing literature. The first model modifies the tensile stress-displacement relationship, while the second adjusts the peak strain at compressive strength and the critical crack opening displacement. These refined models were applied in the finite element software ABAQUS/Explicit and validated against experimental slab tests reported in the literature. Results demonstrate that the proposed models significantly improve the accuracy of predicted failure loads, which show deviations of only 5.6% and 2.7% from experimental outcomes for the first and second models, respectively. Compared to the reference model by Beaulieu and Polak (<CitationRef CitationID="CR9">2023</CitationRef>), the first and second models achieved improvements in failure load prediction accuracy by 9.6% and 12.2%, respectively. Likewise, displacement prediction accuracy improved by 9.9% and 16.2%. These findings underscore the importance of incorporating aggregate-related parameters into constitutive models for more reliable structural performance predictions in RC flat slabs.</p>

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Enhancing the accuracy of punching shear predictions in reinforced concrete flat slabs by refining the constitutive laws of concrete

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Albaraa Alasskar,
  • Shambhu Sharan Mishra

摘要

This study aims to enhance the predictive accuracy of punching shear strength in reinforced concrete flat slabs by refining constitutive laws of concrete through the integration of key material properties. Specifically, compressive strength, tensile strength, and fracture energy parameters are intrinsically linked to aggregate characteristics, are incorporated due to their significant influence on inclined shear crack surface roughness and aggregate interlock governing shear transfer mechanisms. Two modified constitutive laws were refined based on insights from existing literature. The first model modifies the tensile stress-displacement relationship, while the second adjusts the peak strain at compressive strength and the critical crack opening displacement. These refined models were applied in the finite element software ABAQUS/Explicit and validated against experimental slab tests reported in the literature. Results demonstrate that the proposed models significantly improve the accuracy of predicted failure loads, which show deviations of only 5.6% and 2.7% from experimental outcomes for the first and second models, respectively. Compared to the reference model by Beaulieu and Polak (2023), the first and second models achieved improvements in failure load prediction accuracy by 9.6% and 12.2%, respectively. Likewise, displacement prediction accuracy improved by 9.9% and 16.2%. These findings underscore the importance of incorporating aggregate-related parameters into constitutive models for more reliable structural performance predictions in RC flat slabs.