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<p>During earthquakes, the axial force at the top of central columns in subway stations undergoes significant fluctuations, exacerbating column damage and causing noticeable variations in hysteresis curves. Currently, there is a lack of mechanical models for central columns subjected to vertical variable axial forces. This study conducted a theoretical analysis of Engineering Cementitious Composites (ECC) jacketing to enhance the seismic resilience of central columns. Using test and numerical analysis data from previous column tests under vertical variable axial force, a predictive formula for bearing capacity was developed through exponential fitting of stiffness changes and strength degradation, considering axial force amplitude and frequency variations. Additionally, by integrating the plane section assumption, elasticity theory, and the time-dependent variation of vertical axial force, a hysteresis rule was proposed. This enabled the establishment of calculation formulas for key feature points in the hysteresis curve and the development of a restoring force model for central columns. The study also systematically analyzed the sequence of failure points in column specimens. Test verification confirmed the high accuracy of the proposed mechanical models. Furthermore, a strength model for ECC jacketed composite columns was formulated, demonstrating that ECC jacket can increase the bearing capacity of specimens by over 50%. Increasing the thickness of the ECC jacket proved more effective than embedding wire mesh in ordinary concrete. This study provides a novel mechanical model and practical insights, offering significant guidance for future engineering research and seismic design of subway stations.</p>

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Analysis of mechanical properties and strengthening effects of ECC jacket on central columns subjected to high variable axial compression ratios

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Zhichen Liu,
  • Jialing Wang,
  • Linggang Wei,
  • Yu Tang,
  • Yinglong Song,
  • Zuhua Zhang

摘要

During earthquakes, the axial force at the top of central columns in subway stations undergoes significant fluctuations, exacerbating column damage and causing noticeable variations in hysteresis curves. Currently, there is a lack of mechanical models for central columns subjected to vertical variable axial forces. This study conducted a theoretical analysis of Engineering Cementitious Composites (ECC) jacketing to enhance the seismic resilience of central columns. Using test and numerical analysis data from previous column tests under vertical variable axial force, a predictive formula for bearing capacity was developed through exponential fitting of stiffness changes and strength degradation, considering axial force amplitude and frequency variations. Additionally, by integrating the plane section assumption, elasticity theory, and the time-dependent variation of vertical axial force, a hysteresis rule was proposed. This enabled the establishment of calculation formulas for key feature points in the hysteresis curve and the development of a restoring force model for central columns. The study also systematically analyzed the sequence of failure points in column specimens. Test verification confirmed the high accuracy of the proposed mechanical models. Furthermore, a strength model for ECC jacketed composite columns was formulated, demonstrating that ECC jacket can increase the bearing capacity of specimens by over 50%. Increasing the thickness of the ECC jacket proved more effective than embedding wire mesh in ordinary concrete. This study provides a novel mechanical model and practical insights, offering significant guidance for future engineering research and seismic design of subway stations.