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中文摘要：
海水中氯离子的侵蚀是影响钢筋混凝土结构在海洋环境中耐久性的一个重要的因素,而混凝土表面氯离子浓度是研究氯离子侵蚀的重要指标之一。由于混凝土结构沿海拔不同高度的服役环境不同,表面氯离子浓度随高程是变化的,但其分布存在一定的规律。根据浙江东部沿海地区某混凝土码头结构表面氯离子浓度的实测数据,通过数据统计分析,提出表面氯离子浓度随高度呈单峰高斯分布的规律;通过建立BP神经网络预测模型,验证其高斯分布规律假设的合理性。在对浙东沿海某混凝土码头及日本不同海域混凝土码头的表面氯离子浓度实测数据进行概率统计分析后,得到沿海混凝土结构的最严重氯离子侵蚀区域为海拔在0.4～1.6m,其海水浸润时间比为0.285～0.478,应重点加强该区域结构的抗氯侵蚀能力。最后,通过对实测数据的归一化处理,建立了基于高斯函数的海港码头混凝土表面氯离子浓度的高度影响系数和海水浸润时间比影响系数经验表达式。
英文摘要：
Chloride ion is the main reason that impacts the durability of reinforced concrete structures in marine environment,while the surface chloride concentration of concrete structures is one of the most important factor influencing the transport process of chloride into structural concrete. Because of the different local environments for concrete structures at different heights,the surface chloride concentration varys with the heights. Based on the inspected data of surface chloride concentration from a concrete port which locates at eastern coastal area of Zhejiang Province,a single peak Gaussian distribution is proposed to describe the surface chloride concentration along the height of structure. A model of surface chloride using BP neural network is established to predict the distribution of the surface chloride concentration along the height. To find out the most serious chloride aggression region of reinforced concrete structures,probability based statistical analysis of inspection data from concrete ports of eastern coastal area of Zhejiang Province and Japan is carried out. The most serious chloride aggression height is from 0. 4 to 1. 6 m above the sea level,from 0. 285 to 0. 478 of water infiltration time ratio,where the anti-aggression capacity of chloride should be strengthened. Finally, according to the normalized inspected data,empirical equations are proposed to describe the influence of height and water infiltration time on surface chloride ion concentration based on a Gaussian Function.
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