氯盐腐蚀环境下混凝土结构时变可靠度计算摘要.pdfVIP

2011 年2 月 水运工程 Feb. 2011 第2 期 总第450 期 Port Waterway Engineering No. 2 Serial No. 450 氯盐腐蚀环境下混凝土结构时变可靠度计算 1，2 1 薛鹏飞 ，金立兵 （1. 河南工业大学土木建筑学院，河南郑州450052 ；2. 浙江大学土木工程学系，浙江杭州310027） 摘要：基于Fick 扩散定律，建立了氯离子在混凝土中扩散的多因素修正模型，给出了模型中参数的取值。依据可靠性 理论，考虑氯离子侵蚀深度的不同分布特征，利用建立的扩散模型，说明了氯盐侵蚀环境下考虑时变效应的混凝土结构可靠 度计算方法。最后给出了实际工程算例，算例结果说明，假定氯离子侵蚀深度服从正态分布带来的计算偏差并不大，却可大 大简化计算过程。 关键词：混凝土结构；耐久性；时变可靠度；氯离子扩散模型 中图分类号：TU 528 文献标志码：A 文章编号：1002-4972 （2011）02-0045-05 Time-dependent reliability computation of concrete structures based on chloride ion penetration XUE Peng-fei1,2，JIN Li-bing1 (1. Department of Civile Engineering, Henan University of Technology, Zhengzhou 450052, China ；2. Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China) Abstract: A new multi-factor revision model of chloride diffusion in concrete was formulated on the basis of Ficks Law. The value of parameters in the model was given for practical application according to the literature survey and pilot calculation. By using this model and based on the reliability theory, different distribution characteristics of chloride ion corrosion depth was taken into account, then the method of time -dependent reliability calculation was specified. The results of an actual project example shows that the deflection coming from the assumption of corrosion depth subjected to the normal distribution is small, but the computing process can be greatly simplified. Key words: concrete structure; durability; time-dependent reliability; diffusion model of chloride ion 退化结构的评估、检修均涉及结构的时变可