波浪冲击作用下近岸混凝土结构物涂层剥蚀机理

Coating debonding is one of the major causes of marine structures' destruction. Wave impact has aggravatedthe erosion of structure coating in splash zones, which resulted in early failure of structures. As a result, it would lead to huge economic losses,and may even cause sudden disasters. This project, therefore, attempted to study the mechanism of coating erosion in the splash zone under wave through combining the marine hydrodynamics and coating interfacail debonding. Based on the experiments of wave flume, the temporal and spatial distribution of wave impact force in the splash zone were studied. Further, the characteristics of the impact load spectrum was quantitatively analyzed. With the combination of macro-mechanics and meso-damage mechanics, the mechanism of coating erosion in the splash zone was investigated. Finally,the relationship between wave impact loadings and the evolution process of coating damage was discussed.Based on above studies, the ABAQUSwas further developed, and it was parallelized to study the stress-strain response regularity for structure meso-damage under the effects of wave impact load. It finally reveals the evolution process and erosion mechanism of coating damage in the splash zone.This study will benot only of important theoretical significance but also of application value to prolong the service life of themarine structures. The results may provide a guidance for further studying the durability of marine structure coating.

涂层剥蚀是导致海洋结构物破坏的主要原因之一。尤其是浪溅区波浪的反复冲击加速了涂层剥蚀，致使结构物提前失效，造成了巨大的经济损失，甚至可能引发突发性灾难。将波浪冲击力与结构物涂层界面损伤演化相结合，开展波浪作用下混凝土结构物涂层剥蚀机理研究。对延长海洋结构物使用寿命具有重要的理论意义和应用价值。基于波浪水槽实验，研究波浪冲击墙式结构物过程中冲击力时空分布规律，定量分析冲击力荷载谱。并作为宏观力学试验外荷载，开展结构物/涂层宏观力学和细观损伤实验，分析涂层界面的动态应力响应过程，构建涂层界面的损伤本构模型，揭示损伤演化动态响应过程。采用全耦合方法，进行ABAQUS二次开发，建立交变荷载作用下的结构物/涂层复合结构损伤数值模型，分析涂层界面在波浪交变荷载作用下界面损伤度及应力状态的演化规律，揭示波浪作用下墩柱结构物涂层损伤演化过程及其剥蚀机制。为海洋结构物涂层设计和施工标准制定提供理论依据。