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Post-fatigue properties of high-strength concrete subjected to coupled 3D fatigue-static loading

机译：高强度混凝土后疲劳性能对耦合3D疲劳静载荷

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摘要

Concrete structures suffer some damage yet not failed under fatigue load, and then continue to bear 3D redistributed stress. For this, the 3D fatigue loading considering various fatigue factors (e.g. confining stress, axial static stress (ASS) and force amplitude (FA), frequency, and cycle number) is first carried out, and then the 3D static loading is performed. The post-fatigue characteristics of high-strength concrete (e.g. P-wave velocity, Swave velocity, porosity, gas permeability, triaxial compression strength, and elastic modulus) are gained. The results indicate that 3D fatigue loading weakens mechanical properties, delays wave propagation, and increases seepage paths. An obvious stress threshold is exhibited with increasing axial static stress and force amplitude, that is 80% triaxial compressive strength, where the physico-mechanical characteristics are rapidly weakened due to the energy dissipation caused by crack growth rises increasingly. Compared with 1D fatigue loading, the frequency turning point of weakening effect from decreasing to increasing is advanced under 3D fatigue loading due to the application of 3D stress exacerbates the heat accumulation and creep damage generation. Interestingly, the fatigue damage is likely to be more sensitive to axial load compared to confining stress during 3D fatigue loading. In other words, the promotion effect of axial fatigue load on damage is larger than the restriction of confining stress. Furthermore, the fatigue damage models considering various fatigue factors are proposed. Then, the empirical prediction models of this damage variable to mechanical parameters (strength and elastic modulus) and permeability are established to predict the capacity loss caused by fatigue loading in the design of concrete construction. The testing results in this context could facilitate our understanding of post-fatigue characteristics of high-strength concrete subjected to 3D fatigue loading and guide the safe design of concrete construction.
机译：混凝土结构遭受一定的伤害尚未疲劳载荷下失败，然后继续承受3D重新分配压力。为此，该3D疲劳负载考虑各种疲劳因子（例如侧限应力，轴向静应力（ASS）和力的振幅（FA），频率和周期数）被首先进行，然后进行三维静态加载。高强度混凝土的后疲劳特性（例如P波速度，Swave速度，孔隙率，透气性，三轴压缩强度，以及弹性模量）被获得。结果表明，3D疲劳负载减弱的机械性能，延迟波的传播，并增大渗流通道。一个明显的应力阈值表现出与增加的轴向静应力和力的振幅，即80％的三轴压缩强度，其中的物理 - 机械特性迅速由于由裂纹扩展能量耗散减弱日益提高。与1D疲劳负载相比，频率的降低增加转弯削弱作用点是下3D疲劳载荷先进由于3D的应用应力加剧了热积累和蠕变损伤的产生。有趣的是，疲劳损伤可能是相比于3D疲劳加载期间侧限应力对轴向载荷更敏感。换句话说，对损伤的轴向疲劳载荷的提升效果比侧限应力的限制较大。此外，考虑各种因素疲劳疲劳损伤模型提出。然后，该损伤变量机械参数（强度，弹性模量）和磁导率的经验预测模型的建立是为了预测在混凝土施工的设计引起的疲劳负载的容量损失。在这种情况下测试结果可以促进我们的承受3D疲劳载荷的高强度混凝土后的疲劳特性的理解和指导混凝土施工的安全设计。

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