Traditional methods for durability design of marine concrete structures usually select and estimate durability design parameters according to engineering experience due to lack of quantitative design model. In order to deal with this problem, a probabilistic durability design method was developed to determine the allowable values of durability design parameters for marine concrete structures. The characteristic subdomain model was proposed at first to provide an efficient and accurate way to describe the concentration profile of chloride ions within the large concrete structures with complex geometry. Then a deterministic three‐parameter design model was presented to estimate the durability design parameters of marine concrete structures, including the chloride diffusion coefficient, concrete cover thickness, and aging factor. Finally, a probabilistic durability design procedure was developed by taking into account the probabilistic durability limit state function and the predefined target reliability index rationally. A 150,000 ton wharf in the Beibu Gulf was taken as an example to demonstrate the validity of the proposed method. Results show that the proposed method reflects accurately the influences of geometry, material properties, and environmental conditions as well as their uncertainties on the durability performance, satisfying the requirement of service life of marine concrete structures under chloride environment.

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基于特征子域模型的海洋混凝土结构概率耐久性设计方法

由于缺乏定量设计模型，传统的海洋混凝土结构耐久性设计方法通常根据工程经验来选择和估算耐久性设计参数。为了解决这个问题，开发了一种概率耐久性设计方法来确定船用混凝土结构的耐久性设计参数的允许值。首先提出了特征子域模型，以提供一种有效而准确的方式来描述具有复杂几何形状的大型混凝土结构中氯离子的浓度分布。然后，提出了确定性的三参数设计模型来估计海工混凝土结构的耐久性设计参数，包括氯化物扩散系数，混凝土覆盖层厚度和老化因子。最后，通过合理考虑概率耐久性极限状态函数和预定义的目标可靠性指标，开发了概率耐久性设计程序。以北部湾一个15万吨的码头为例，证明了该方法的有效性。结果表明，该方法准确反映了几何，材料性能，环境条件及其不确定性对耐久性能的影响，满足了氯化物环境下海工混凝土结构使用寿命的要求。以北部湾000吨码头为例，证明了该方法的有效性。结果表明，该方法准确反映了几何，材料性能，环境条件及其不确定性对耐久性能的影响，满足了氯化物环境下海工混凝土结构使用寿命的要求。以北部湾000吨码头为例，证明了该方法的有效性。结果表明，该方法准确反映了几何，材料性能，环境条件及其不确定性对耐久性能的影响，满足了氯化物环境下海工混凝土结构使用寿命的要求。