疲劳荷载作用后锈蚀钢筋混凝土梁承载力理论计算方法  

A theoretical method to calculate the load carrying capacity of corroded reinforced concrete beam after fatigue load

作　　者：杨晓明[1] 吴桐[1] 李富斋 

机构地区：[1]辽宁工程技术大学建筑工程学院,辽宁阜新123000

出　　处：《地震工程与工程振动》2015年第3期210-216,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51008148);辽宁省教育厅2013年杰出青年学者成长计划(LJQ2013037)

摘　　要：锈蚀钢筋混凝土的疲劳破坏是在钢筋锈蚀和疲劳荷载共同作用下造成的结构破坏,其危害巨大。准确获得锈蚀钢筋混凝土构件在经历若干次疲劳荷载作用后的实际承载能力更是具有重要的现实意义。本文在理论上对疲劳荷载作用后锈蚀钢筋混凝土梁承载力进行分析。首先,考虑锈蚀因素对钢筋混凝土梁承载力的影响;其次,考虑疲劳荷载作用对钢筋混凝土梁承载力的影响;最后,考虑上述两种因素的影响,修改现行规范的未锈蚀钢筋混凝土梁抗弯承载力公式中的钢筋屈服强度及截面面积,获得若干次疲劳荷载作用后锈蚀钢筋混凝土梁抗弯承载力的理论计算公式。The damage to reinforced concrete from steel corrosion and fatigue load are destructive for concrete civil engineering structures, since it is induced by the coupling effect of corrosion and fatigue. It is more significant to obtain the real load carrying capacity of corroded reinforced concrete component after several times of fatigue load. Thus, the theoretical analysis of this problem is carried out in this paper. First, the effect of corrosion on the con- crete beam is analyzed. Then, the fatigue is included. Finally, the theoretical formula to calculate the real load carrying capacity of corroded reinforced concrete component after several times of fatigue load is derived by modifying the yield strength and section area of steel bars in the concrete beam considering the above effects of corrosion and fatigue, which can provide the help for more precise theoretical analysis of fatigue performance of corroded reinforced concrete.

关 键 词：钢筋混凝土 锈蚀 疲劳 承载力 理论方法 

分 类 号：TU375.1[建筑科学—结构工程] P315.92[天文地球—地震学]