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<p>To investigate the effect of corrosion in marine and industrial environments on the axial compressive property of steel tube confined concrete, 14 test pieces of steel tube confined concrete were designed. Axial compression tests were conducted to comparatively analyze the influence of different corrosion types on the failure modes, mass loss rate, load-slip curves, axial bearing capacity, strain distribution, confinement coefficient, and ductility. The test results indicate that the load-slip curves and failure modes of steel tube confined concrete under marine and industrial corrosion are similar. The mass loss rate of steel tube confined concrete under both corrosion environments decreases with increasing corrosion time, with the most severe quality loss observed in the marine corrosive environment, reaching a maximum mass loss rate of 1.1118%. Compared to industrial corrosion, marine corrosion leads to a more significant reduction in the axial bearing capacity, with a 13.37% decrease after 720&#xa0;h of corrosion. Both corrosion types show no clear pattern in their influence on the confinement coefficient; however, the specimens exposed to marine corrosion exhibit lower ductility, Based on the test results, a corrosion reduction coefficient was introduced to modify the existing predictive formula for the axial bearing capacity of steel tube confined concrete. The calculated values from the modified formula align well with the experimental results, showing a high degree of agreement.</p>

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Axial Bearing Capacity of Steel Tube Confined Concrete Stubs Under Salt Spray Corrosion

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Shan Gao,
  • Tianyu Li,
  • Jian Yuan,
  • Yuhui Feng,
  • Puzhen An,
  • Chuanxin Rong

摘要

To investigate the effect of corrosion in marine and industrial environments on the axial compressive property of steel tube confined concrete, 14 test pieces of steel tube confined concrete were designed. Axial compression tests were conducted to comparatively analyze the influence of different corrosion types on the failure modes, mass loss rate, load-slip curves, axial bearing capacity, strain distribution, confinement coefficient, and ductility. The test results indicate that the load-slip curves and failure modes of steel tube confined concrete under marine and industrial corrosion are similar. The mass loss rate of steel tube confined concrete under both corrosion environments decreases with increasing corrosion time, with the most severe quality loss observed in the marine corrosive environment, reaching a maximum mass loss rate of 1.1118%. Compared to industrial corrosion, marine corrosion leads to a more significant reduction in the axial bearing capacity, with a 13.37% decrease after 720 h of corrosion. Both corrosion types show no clear pattern in their influence on the confinement coefficient; however, the specimens exposed to marine corrosion exhibit lower ductility, Based on the test results, a corrosion reduction coefficient was introduced to modify the existing predictive formula for the axial bearing capacity of steel tube confined concrete. The calculated values from the modified formula align well with the experimental results, showing a high degree of agreement.