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目前对混凝土腐蚀疲劳问题主要集中在试验研究,难以揭示其变形和破坏的物理机制。针对这一问题,根据扩散理论及损伤力学理论建立了疲劳荷载与硫酸盐腐蚀耦合作用下水泥混凝土应力的数值求解方法。主要推导出受疲劳荷载作用的混凝土扩散系数公式,建立了硫酸盐腐蚀与疲劳荷载耦合关系,分析不同外界环境条件对疲劳荷载与硫酸盐耦合作用下水泥混凝土内部应力的影响,为疲劳荷载与硫酸盐腐蚀耦合作用下水泥混凝土构件损伤演化与寿命预测奠定基础。
At present, the problem of corrosion fatigue of concrete mainly focuses on experimental research and it is difficult to reveal the physical mechanism of deformation and failure. In response to this problem, according to diffusion theory and damage mechanics theory, a numerical method to solve the stress of cement concrete under fatigue load and sulfate corrosion was established. The formula of diffusion coefficient of concrete subjected to fatigue load was mainly deduced. The coupling relationship between sulfate corrosion and fatigue load was established. The influence of different external environmental conditions on the internal stress of cement concrete under fatigue load and sulfate coupling was analyzed. LAYOUT OF DAMAGE EVOLUTION AND LIFE PREDICTION OF CONCRETE MEMBERS UNDER COUPLED SALICITY.