基于区间分析的锈蚀钢筋混凝土结构使用寿命预测  

Service life prediction of corroded RC structures based on interval analysis

作　　者：孙彬[1] 牛荻涛[2] 王庆霖[2] 

机构地区：[1]中国建筑科学研究院,北京100013 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2012年第6期110-115,共6页Journal of Building Structures

基　　金："十一五"国家科技支撑计划重大项目(2006BAJ03A02);中国建筑科学研究院应用研究项目(20080112330730004)

摘　　要：钢筋锈蚀程度具有很大的不确定性,为体现锈蚀不确定性对结构寿命预测结果的影响,将区间分析方法引入锈蚀钢筋混凝土结构的使用寿命预测。首先,对区间分析的基础知识及区间参数问题的求解方法作简单介绍,针对区间运算法则导致运算结果区间扩张的缺陷,优化方法是求解区间参数问题的有效方法;其次,基于钢筋锈蚀过程的确定性预测模型,采用区间数描述结构参数及环境参数,提出结构锈蚀损伤的区间预测方法;再根据选取的使用寿命终结标准,提出结构使用寿命的区间预测方法。工程实例分析表明,该方法分析过程简单,不需要建立不确定参数的概率模型,分析结果以区间形式给出,预测结果较概率方法更直观,易于接受。Corrosion degree of a reinforcing bar is a great uncertainty.In order to reflect impacts of uncertain corrosion on life prediction of RC structures,interval analysis was introduced into service life prediction of corroded RC structures.Firstly,fundamental knowledge about interval analysis and its solving method were introduced.To avoid interval overestimation caused by interval computation principle,optimization method is an effective method to solve interval problems.Secondly,based on the certain prediction model of steel corrosion process,interval number was used to describe structural parameters and environmental parameters,and interval prediction method for structural damage caused by steel corrosion was proposed.Finally,termination criterion for service life was determined,and interval prediction method for service life prediction of corroded RC structures was put forward.The method was used to analyze an actual structure,and the analysis result indicates that the analysis process without probability model of uncertain parameters is simple and the interval result is visual and easy to accept.

关 键 词：钢筋混凝土结构 锈蚀 区间分析 使用寿命 预测 

分 类 号：TU375[建筑科学—结构工程] TU311.4