海洋环境下钢筋混凝土中钢筋锈蚀的概率  

Probabilistic analysis of rebar rust in concrete under marine environment

作　　者：王甲春[1] 阎培渝[2] 

机构地区：[1]厦门理工学院土木工程与建筑系,福建厦门361024 [2]清华大学土木工程系,北京100084

出　　处：《吉林大学学报（工学版）》2014年第2期352-357,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51108396);福建省自然科学基金项目(2008J0171);厦门市科技计划项目(3502Z20113033);厦门建设科技项目(2011-1-7)

摘　　要：为了分析海洋环境下钢筋混凝土中钢筋锈蚀的随机性,利用可靠度理论建立了钢筋混凝土中钢筋锈蚀的功能函数,引入混凝土的氯离子扩散系数和混凝土保护层厚度两个随机变量,推导出了在一定使用寿命条件下的钢筋混凝土中钢锈蚀的概率和在一定的钢筋锈蚀概率条件下钢筋混凝土结构的服役时间计算公式,通过模拟海水浸泡钢筋混凝土的腐蚀实验对此方法进行了验证。结果表明,利用概率方法分析钢筋混凝土的使用寿命和锈蚀概率是有效的,可以用来评价钢筋混凝土的耐久性,降低混凝土的渗透性和适当增加混凝土的保护层厚度可以明显提高钢筋混凝土在海洋环境下的耐久性。In order to analyze the randomness of the steel corrosion in rein{orced concrete in the in marine environment, the performance function of the corrosion of steel bars in reinforced concrete is proposed using reliability theory. The proposed function contains two random variables： the chloride diffusion coefficient of concrete and the thickness of the protective layer. The calculation methods of the probability of steel corrosion under some environmental conditions and the service life of reinforced concrete under a certain degree of reinforcement corrosion probability are given. This method is validated with reinforced concrete experiments that simulate seawater corrosion. The results show that the use of probabilistic methods to analyze the service life of reinforced concrete and the probability of corrosion is effective. The method can be used to evaluate the reinforced concrete durability. Decrease in the concrete permeability and appropriate increase in the thickness of the protective layer of concrete reinforced concrete can be significantly improved in the marine environment durability.

关 键 词：土木工程 钢筋混凝土 钢筋锈蚀 氯离子 

分 类 号：TU528[建筑科学—建筑技术科学]