摘要
以海洋环境为背景,从钢筋和混凝土自身的劣化出发,根据Fick扩散定律,推导出沿海环境下钢筋初始锈蚀时间的计算公式.考虑钢筋坑蚀的特点,选择了适合的钢筋劣化模型和混凝土劣化模型,建立了偏心受压结构按承载力极限状态计算的抗力劣化模型,并运用可靠度分析方法对某跨海大桥的墩柱进行了耐久性评估.
Based on the background of the marine environment,the formulas are derived for evaluating the intial corrosion time of steel bars under coastal chloride ion environments acoording to deterioration mechanism of steel bars and concrete and Fick′s diffusion theorem.Considering the pitting corrosion characteristic of the steel bar,appropriate steel bar deterioration models and concrete deterioration models are selected,and the resistance deterioration model of eccentrically compressed structure calculated on bearing capacity limited state is established.Finally,durability assessment of the piers of an in-service cross-sea bridge is made by means of reliability analysis.
出处
《大连交通大学学报》
CAS
2010年第2期28-33,共6页
Journal of Dalian Jiaotong University
关键词
海洋环境
氯离子侵蚀
可靠度指标
耐久性评估
marine environment
chloride ion corrosion
reliability index
durability assessment
