中文摘要：

在环境条件和使用荷载作用下，高桩码头结构损伤和承载力降低是普遍存在的问题。在役梁板式高桩码头结构安全评估，是保证港口设施安全运行的必要措施。结构整体可靠度是结构安全评估的核心指标，但目前尚未建立结构整体可靠度计算的有效方法。基于非线性有限元数值模型，采用蒙特卡罗模拟技术确定了典型梁板式高桩码头结构整体极限承载力概率分布模型及其统计参数，研究了损伤位置、损伤程度和损伤数量等对极限承载力概率分布及其统计参数的影响，明确了无损结构整体极限承载力概率分布模型及其统计参数可用于损伤结构分析。将结构整体极限承载力作为结构抗力随机变量，采用一次二阶矩法计算结构的可靠指标，建立了一种在役梁板式高桩码头结构整体可靠度计算的有效方法。

英文摘要：

Member damage and bearing capacity reduction are the common problems for the beam-slab piled wharf due to the effect of marine environment and load action. The safety assessment of the beam-slab piled wharf is a necessary measure for the safe operation of port facilities. The structure system reliability is the key index for structure safety assessment. However, there is no efficient method for the calculation of structure system reliability at present. Based on nonlinear finite element model, the probability distribution model with statistical parameters of the ultimate bearing capacity of beam-slab piled wharf is established by using Monte Carlo simulation method. The effects of the damage location, damage extent and damage quantity on the probability distribution model and statistical parameters of the ultimate bearing capacity are investigated. It is showed that the probability distribution and statistical parameters of ultimate bearing capacity of the damaged structures are basically the same as those of the non-destructive structure. Taking the ultimate bearing capacity of the structure system as the random variable of structure resistance and calculating the reliability index of structure using the first-order second-moment method, an effective method for calculating the system reliability of beam-slab piled wharf is proposed.