氯盐腐蚀下混凝土服役寿命的可靠度分析  

Stochastic finite element reliability analysis for service life of concrete structure in chloride environment

作　　者：葛若东[1,2] 洪斌[1,2] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《混凝土》2013年第3期14-17,共4页Concrete

基　　金：国家自然科学基金(51208120);广西科学技术项目(2010GXNSFD169008;2012GXNSFEA053002;桂科攻0992027-9)

摘　　要：混凝土性能的随机性对混凝土结构的服役寿命有重要影响。在考虑混凝土的氯离子扩散系数和临界氯离子浓度的随机性基础上,利用摄动技术研究建立了混凝土中氯离子扩散分析的摄动随机有限元法,结合混凝土内钢筋锈蚀极限状态方程,建立氯盐腐蚀环境下混凝土结构服役寿命分析的可靠度分析方法。通过算例分析,验证了本研究方法具有较高的计算精度和效率,同时分析了保护层厚度、扩散系数变异性等因素对氯离子扩散过程和混凝土服役寿命的影响。The uncertainty of concrete plays a significant role in service life prediction of concrete structures under chloride environment.It developed the perturbation stochastic fmite element method to deal with the randomness of the chloride diffusion coefficient and the critical concentration by means of the perturbation technique.The service life concrete was analyzed by the perturbation stochastic finite element reliability method based on the equation of limit state accounting for the threshold of chloride concentration.A numerical example was considered to demonstrate the accuracy and efficiency of the proposed method,the parametric study was conducted to investigate the effect of the covering thickness and the coefficient of variation of the diffusion coefficient on the service life of the concrete structures.

关 键 词：混凝土 氯离子 随机有限元 服役寿命 可靠度 

分 类 号：TU528.01[建筑科学—建筑技术科学]