Pile-supported wharves, as one of the main components in marine harbor systems, are subjected to multiple hazards such as earthquakes and corrosion during their lifetime. In this paper, the corrosion initiation time due to chloride ion diffusion (using both the deterministic and probabilistic approaches), temperature and humidity variations are calculated for various steel materials in the typical pile-supported wharf of port Los Angeles. Various deterioration sources such as reduction in the ultimate strength and strain of prestressed strands and concrete compressive strength are simulated. The updating limit state functions are identified by nonlinear static analysis. Finally, the time-dependent fragility curves are developed using incremental dynamic analysis. Results show that corrosion considerably reduces the seismic performance due to both structural strength and ductility over the life cycle of the wharf. It also causes brittle fracture, a sudden and complete failure of the corroded piles towards the end of the structure’s life cycle. Finally, a set of analytical models is proposed to estimate the median of the aging fragility functions with a nearly constant dispersion.

桩支撑码头作为海洋港口系统的主要组成部分之一，在其使用寿命期间会遭受多种危害，例如地震和腐蚀。在本文中，针对洛杉矶港典型桩承码头中的各种钢材，计算了由于氯离子扩散（使用确定性方法和概率方法），温度和湿度变化引起的腐蚀开始时间。模拟了各种劣化源，例如预应力钢绞线的极限强度和应变降低以及混凝土的抗压强度。通过非线性静态分析确定更新极限状态函数。最后，使用增量动态分析来建立与时间相关的脆性曲线。结果表明，在码头的整个生命周期中，由于结构强度和延展性，腐蚀大大降低了地震性能。它还会导致脆性断裂，在结构寿命周期快结束时，腐蚀桩突然彻底失效。最后，提出了一套分析模型来估计具有几乎恒定分散度的老化脆性函数的中值。