中文摘要：

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。

英文摘要：

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.