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<p>This study experimentally investigates the strain response and punching shear enhancement of CFRP-strengthened bubble deck slabs with varying void diameters (50, 60, and 70&#xa0;mm) and preload damage levels (0%, 50%, 60%, and 75%). Strain gauge measurements revealed that increasing void size and preload severity significantly elevated strain concentrations, with 70&#xa0;mm voids exhibiting 15–20% higher concrete strains (2108 µε) compared to 50&#xa0;mm voids (1634 µε) at 75% damage. CFRP rehabilitation effectively reduced operational strains by 25–40%, demonstrating superior performance at moderate damage levels (50–60% preload), where steel strains decreased from 1466 µε to near-original values. However, strain curve analysis identified critical debonding behavior through sudden 300–500 µε spikes during failure, particularly in severely damaged (75% preload) specimens. While CFRP restored up to 98.5% of the ultimate load capacity of the corresponding undamaged solid slab, all rehabilitated slabs exceeded serviceability deflection limits (L/240), revealing a persistent stiffness challenge. The 50&#xa0;mm bubble slabs showed optimal strain distribution and recovery, making them the most viable for practical applications. These findings provide novel insights into strain-dependent failure mechanisms of CFRP-strengthened voided slabs, emphasizing the need for improved bonding techniques and hybrid reinforcement strategies to address debonding and excessive deflection in lightweight retrofitted structures.</p>

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Strain response and punching shear enhancement in CFRP-strengthened bubble deck slabs: experimental study

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Muntadher Ragheef Bader,
  • Abdulkhalik J. Abdulridha

摘要

This study experimentally investigates the strain response and punching shear enhancement of CFRP-strengthened bubble deck slabs with varying void diameters (50, 60, and 70 mm) and preload damage levels (0%, 50%, 60%, and 75%). Strain gauge measurements revealed that increasing void size and preload severity significantly elevated strain concentrations, with 70 mm voids exhibiting 15–20% higher concrete strains (2108 µε) compared to 50 mm voids (1634 µε) at 75% damage. CFRP rehabilitation effectively reduced operational strains by 25–40%, demonstrating superior performance at moderate damage levels (50–60% preload), where steel strains decreased from 1466 µε to near-original values. However, strain curve analysis identified critical debonding behavior through sudden 300–500 µε spikes during failure, particularly in severely damaged (75% preload) specimens. While CFRP restored up to 98.5% of the ultimate load capacity of the corresponding undamaged solid slab, all rehabilitated slabs exceeded serviceability deflection limits (L/240), revealing a persistent stiffness challenge. The 50 mm bubble slabs showed optimal strain distribution and recovery, making them the most viable for practical applications. These findings provide novel insights into strain-dependent failure mechanisms of CFRP-strengthened voided slabs, emphasizing the need for improved bonding techniques and hybrid reinforcement strategies to address debonding and excessive deflection in lightweight retrofitted structures.