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为研究锈蚀损伤混凝土管桩的水平承载性状,依据Fick第二定律,建立了氯离子在混凝土管桩中的扩散方程,并结合初始和边界条件,得到扩散方程的解析解.依据厚壁圆筒模型,推导了钢筋混凝土管桩保护层锈胀开裂时的钢筋临界锈蚀深度.基于Faraday定律,对钢筋混凝土管桩保护层锈胀开裂时间进行了预测.并在此基础上,通过引入桩身抗弯刚度折减系数对海洋环境下锈蚀损伤钢筋混凝土管桩的桩身抗弯刚度的衰减规律进行了探讨,进而对海洋环境下锈蚀损伤钢筋混凝土管桩的水平承载性状的时变特性进行了分析.结果表明:海洋环境中氯离子侵蚀引起的钢筋锈蚀对钢筋混凝土管桩的水平承载性状有明显影响.随着暴露时间的延长,桩身抗弯刚度呈非线性衰减,桩身水平位移和桩身负剪力最大值逐渐增大,桩身弯矩逐渐减小.
In order to study the horizontal bearing behavior of corroded concrete pipe piles, according to Fick’s second law, the diffusion equation of chloride ions in concrete pipe piles was established, and the analytical solution of diffusion equation was obtained by combining initial and boundary conditions. Model, the critical depth of corrosion of steel bars during the corrosion cracking of reinforced concrete pipe piles was derived.Faraday’s law was used to predict the cracking time of steel pipe concrete piles in the protective layer, and based on this, Bending stiffness reduction coefficient is used to study the decay law of the bending stiffness of the piles of rust damaged steel pipe piles under the marine environment. Then the time-varying characteristics of the horizontal load-bearing properties of the corrosion damaged steel pipe piles under the marine environment are analyzed The results show that corrosion of steel bar caused by chloride ion in marine environment has a significant effect on the horizontal bearing behavior of reinforced concrete pipe piles.With the prolongation of exposure time, the bending stiffness of piles is nonlinearly attenuated, the horizontal displacement of piles and pile The maximum value of body shear increases gradually, and the bending moment of pile body gradually decreases.