摘  要：对8根钢筋混凝土梁进行了大气环境、淡水及海水环境下的疲劳试验，研究了其力学性能及刚度损伤演化规律。进一步分析了三种环境与循环荷载共同作用下试件梁的破坏形态、挠度发展规律和疲劳寿命。试验结果表明，腐蚀和疲劳存在耦合作用，海水腐蚀环境与5%～70%荷载水平作用下，梁疲劳寿命最短。根据理论分析和试验结果，对钢筋混凝土梁在严酷海洋环境下的疲劳寿命及其规律进行了进一步研究，参考已有文献和试验研究结果给出了基于钢筋混凝土梁刚度损伤演化规律的疲劳寿命预测模型，经计算，实测结果与该预测模型计算结果之间的误差不超过13%。

Abstract: The fatigue tests of eight reinforced concrete beams under atmospheric, fresh water and seawater conditions were carried out to study the mechanical properties and stiffness damage evolution of reinforced concrete beams. Further analyze the failure mode, deflection development law and fatigue life of the specimen beam under the interaction of three environments and cyclic loads. The test results show that there is coupling between corrosion and fatigue. Under the action of seawater corrosion environment and 5%～70% load level, the fatigue life of the beam is the shortest. According to the theoretical analysis and experimental results, the fatigue life and its regularity of reinforced concrete beams under severe marine environment are further studied. Referring to the existing literature and experimental research results, the fatigue life prediction model based on the stiffness damage evolution law of reinforced concrete beams is given. After calculation, the error between the measured results and the calculated results of the predictive model does not exceed 13%.