The fatigue behavior of strength , stiffness , and deformation of concrete is analysed systematically . the fatigue equation is established . the empirical expressions of the total longitudinal strain and the elastic modulus are given , and the relationships between the increasing rate of the total second - stage strain and the decreasing rate of the elastic modulus with the cyclic number are obtained 系统地分析了砼抗拉、拉-压疲劳强度、刚度、变形规律；建立了相应的s - n关系，提出了纵向总应变、弹性模量的经验公式，及其第二阶段总应变增长率、弹性模量衰减率分别与疲劳寿命的关系式。
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The research is that : after the same cyclic number of loading times , the steel stress of reinforced beams was much smaller than that of common beam ; the deflection of reinforced beams was decreased by 40 % - 50 % , therefore , the anti - transformation of the reinforced beams is enhanced greatly 研究发现：经过相同次数的疲劳荷载作用后，完好加固梁的钢武汉理工大学硕士学位论文筋应变小于未加固梁，加固梁的变形减少了40 %一50 % ，加固梁的疲劳寿命提高t60 % ~ 80 % 。
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