Time-varying behavior of corrosion-damaged piles under cyclic lateral loading in marine environments

In this study, degradation models for pile and soil stiffnesses under cyclic lateral loading in marine environments are established. Based on the proposed models, the time-varying behavior of corrosion-damaged piles under cyclic lateral loading in marine environments is analyzed. The influences of the surface chloride concentration, number of cycles and cyclic load amplitude on the behavior of corrosion-damaged piles under cyclic lateral loading are investigated. The results show that the degradation rate of the pile stiffness speeds up with the increase in surface chloride concentration and that the attenuation coefficient of the soil stiffness gradually decreases with the increase in the number of cyclic lateral loads. The lateral displacement of the pile at the same depth increases with increasing exposure time and the number of cycles. The bending moment of the pile decreases with the deepening of the corrosion degree of the pile at the same pile depth. The position of the rotation center gradually moves down with the increase in the cyclic load amplitude. For the same exposure time, the lateral displacement of the pile top increases with increasing cyclic load amplitude, and the maximum bending moment of the pile increases with increasing cyclic load amplitude.