锈蚀钢筋混凝土结构可靠度评估  

RELIABILITY ASSESSMENT OF CONCRETE STRUCTURES WITH CORRODED REINFORCEMENT

作　　者：吴瑾[1] 吴胜兴[2] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]河海大学土木工程学院,南京210098

出　　处：《工程力学》2005年第1期118-122,共5页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50079002)

摘　　要：钢筋锈蚀是混凝土结构破坏最主要的原因之一,目前钢筋混凝土结构可靠度研究大多数没有考虑锈蚀的影响。提出了锈蚀钢筋混凝土结构可靠度评估方法。首先分析大气环境下和氯离子环境下钢筋锈蚀的模型,然后考虑钢筋面积和粘结强度的降低,建立锈蚀钢筋混凝土结构抗力的随机模型,最后采用一次二阶矩实用分析法计算可靠度指标,以评估大气环境下和氯离子环境下混凝土结构可靠度。两个算例表明,该方法可用于锈蚀钢筋混凝土结构可靠度评估。Corrosion of steel reinforcement is one of the most significant causes of deterioration of reinforced concrete structures. At present, most reliability studies of reinforced concrete structures do not consider the effects of corrosion. In this paper, we present a reliability-based approach to the assessment of concrete structures with corroded reinforcement. First, models for reinforcement corrosion in atmosphere and chloride environment are analyzed. Secondly, it is assumed that corrosion will lead to a reduction in reinforcement cross-sectional area and a reduction in bond strength. A stochastic model for resistance of concrete structures with corroded reinforcement is proposed. The reliability of reinforced concrete structures in atmosphere and chloride environment is estimated in terms of the reliability index using the first-order reliability method. The present approach, which is demonstrated in two examples, can be used to assess reliability of concrete structures with corroded reinforcement.

关 键 词：结构工程 可靠度指标 一次二阶矩法 锈蚀 钢筋混凝土 

分 类 号：TU375[建筑科学—结构工程]