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<p>The creep mechanism of reinforced concrete (RC) structures remains complex, particularly for highly reinforced members (reinforcement ratio &gt; 1.5%) under combined compression and bending, which have received limited attention. In this study, the influence of reinforcement ratio on creep behavior is investigated through theoretical analysis, experimental testing, and numerical simulation. Creep reduction coefficients accounting for the reinforcement ratio are derived theoretically and validated against experimental data from sustained axial compression tests on five groups of RC members with reinforcement ratios of 1.8%, 2.7%, and 3.6%. Experimental results show that increasing the reinforcement ratio from 1.8% to 2.7% and 3.6% reduces creep deformation by 16.9% and 31.5%, and decreases the creep coefficient by 15.4% and 33.3%, respectively. Comparisons with the China highway bridge code (JTG 3362-2018) reveal that the code overestimates creep by 5.0%, 13.7%, and 18.1% for reinforcement ratios of 1.8%, 2.7%, and 3.6%, respectively. The proposed modified creep model, incorporating a reinforcement-ratio-dependent reduction coefficient, achieves average relative differences below 9% when compared with both experimental and numerical results, demonstrating its reliability for predicting long-term deformation in highly reinforced concrete structures.</p>

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Experimental and theoretical study on creep behavior of reinforced concrete members with high reinforcement ratios

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Zijie Hong,
  • Xiao Li,
  • Kun Zhang,
  • Xiaowei Wang,
  • Jinpeng Hou,
  • Fayuan Sun

摘要

The creep mechanism of reinforced concrete (RC) structures remains complex, particularly for highly reinforced members (reinforcement ratio > 1.5%) under combined compression and bending, which have received limited attention. In this study, the influence of reinforcement ratio on creep behavior is investigated through theoretical analysis, experimental testing, and numerical simulation. Creep reduction coefficients accounting for the reinforcement ratio are derived theoretically and validated against experimental data from sustained axial compression tests on five groups of RC members with reinforcement ratios of 1.8%, 2.7%, and 3.6%. Experimental results show that increasing the reinforcement ratio from 1.8% to 2.7% and 3.6% reduces creep deformation by 16.9% and 31.5%, and decreases the creep coefficient by 15.4% and 33.3%, respectively. Comparisons with the China highway bridge code (JTG 3362-2018) reveal that the code overestimates creep by 5.0%, 13.7%, and 18.1% for reinforcement ratios of 1.8%, 2.7%, and 3.6%, respectively. The proposed modified creep model, incorporating a reinforcement-ratio-dependent reduction coefficient, achieves average relative differences below 9% when compared with both experimental and numerical results, demonstrating its reliability for predicting long-term deformation in highly reinforced concrete structures.