Abstract

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.

摘要

在这项研究中，建立了海洋环境中循环侧向载荷下桩和土壤刚度的退化模型。基于所提出的模型，分析了海洋环境中循环侧向荷载作用下腐蚀损伤桩的时变行为。研究了表面氯化物浓度、循环次数和循环荷载幅值对循环侧向荷载作用下腐蚀损伤桩性能的影响。结果表明，随着地表氯化物浓度的增加，桩体刚度的退化速度加快，土体刚度的衰减系数随着循环侧向荷载次数的增加而逐渐减小。随着暴露时间和循环次数的增加，桩在相同深度处的横向位移增加。在相同桩深下，桩的弯矩随着桩身腐蚀程度的加深而减小。随着循环载荷幅值的增加，旋转中心的位置逐渐下移。在相同的暴露时间下，桩顶横向位移随循环荷载幅值的增加而增大，桩的最大弯矩随循环荷载幅值的增大而增大。