波浪作用下海工混凝土结构动态损伤试验研究

项目名称： 波浪作用下海工混凝土结构动态损伤试验研究

项目编号： No.51508234

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 陈妤

作者单位： 江苏大学

项目金额： 21万元

中文摘要： 在海洋及港口工程中，关于海工混凝土结构动态损伤演化机理的探讨已逐步引起相关学者的关注。本项目在申请人前期研究的基础上，选择沿海桥梁为研究对象，开展模拟波浪作用下混凝土结构动态损伤试验，进而揭示海工混凝土结构内部动态损伤演化规律。主要内容有：重点开展波浪作用与钢筋锈蚀条件下，考虑其耦合效应影响的海工混凝土结构动态损伤试验方法研究；运用光纤光栅传感技术，测试海工混凝土动态应变以及钢筋锈胀应变；建立海工混凝土结构损伤衰减动力响应方程，探索结构动态损伤衰减机制；基于应变损伤理论以及分形理论，提出考虑动态损伤细观特征描述与宏观损伤特性分析的动态损伤变量，构建宏－细观结合的结构动态损伤演化方程与动态损伤本构关系，提出便于工程实用的海工结构动态损伤评价指标。相关研究成果可为后期该类结构健康监测、损伤评估以及安全预警提供理论与方法，并为相关规范的修改与完善提供依据。

中文关键词： 海工混凝土结构；波浪作用；动态损伤；光纤光栅；耦合

英文摘要： In ocean and port engineering, evolution mechanism of dynamic damage for marine concrete structure has attracted concern of engineers and scholars. According to our related research achievements, costal bridges are chosen as research objects, and dynamic damage experiment of marine concrete structure with wave action is carried out. Dynamic cumulative damage evolution law is discussed. It mainly involves that, dynamic damage experiment method of marine concrete structures is researched, considering the coupling effect with wave action and steel corrosion environment. Dynamic strain of concrete and corrosion expansion for marine concrete structure is tested by Fiber Bragg Grating sensing technology. Dynamic response of damage attenuation for marine concrete structure is built. Dynamic damage attenuation mechanics of marine concrete structures with wave action is researched. Damage variables considering meso and macro characteristics of dynamic damage are proposed based on strain damage theory and fractal theory. The evolution equation and constitutive relation of dynamic damage are built. Dynamic damage estimation index for marine concrete structures is proposed. Relevant research results could provide not only theory and methods for the structural health monitoring, dynamic damage estimation and safety early warning, but also basis for the revision and improvement of related standards and codes.

英文关键词： marine concrete structures;wave action;dynamic damage;Fiber Bragg Grating;coupling