腐蚀环境下钢筋混凝土结构疲劳可靠度的分析方法  

FATIGUE RELIABILITY ANALYSIS FOR CORRODED REINFORCED CONCRETE STRUCTURES

作　　者：贡金鑫[1] 赵国藩[1] 

机构地区：[1]大连理工大学

出　　处：《土木工程学报》2000年第6期50-56,共7页China Civil Engineering Journal

基　　金：国家自然科学基金!(50078009);中国博士后基金

摘　　要：疲劳分析与验算是承受反复荷载作用结构设计的重要内容之一，相应的可靠度为疲劳可靠度。当 结构处于腐蚀环境时，由于腐蚀介质的侵蚀，结构疲劳性能的降低要比静态性能的降低明显。本文研究了腐蚀 环境下钢筋混凝土结构的疲劳可靠度问题，提出了相应的计算方法。计算表明，依赖于钢筋的锈蚀程度，钢筋 混凝土结构的疲劳可靠度有不同程度的下降。The characteristics of the loads and the materials have a some random appearances. The fatigue reliability analysis is used to assess the safety of a reinforced concrete structure subjected to a repeated load. The fatigue performance of the reinforced concrete structures is deteriorated severely as a result of the corrosion of the steel ha. The corrosion not only decreases an effective area of a steel bar but also causes a stress concentration. It is necessary to consider the time-dependent characteristic of a fatigue of the structures. The Poisson stochastic process theory and the Palmgren-Miner rule are adopted to describe the loads and the materials. The results show that the fatigue reliability decreases extensively with the increasing of the corrosion rate.

关 键 词：钢筋混凝土结构 腐蚀 疲劳 可靠度 腐蚀环境 

分 类 号：TU375.01[建筑科学—结构工程]