高延性纤维混凝土拉压疲劳性能试验研究

摘要

高延性纤维混凝土具有良好的变形能力和抗疲劳性能, 可以将其应用在承受周期荷载的大型混凝土工程中.为研究高延性纤维混凝土的疲劳性能, 共制作了54个试件, 对其进行等幅重复荷载作用下的拉压疲劳试验.通过静力拉伸试验得到极限拉应力后, 分别采用0.7、0.8、0.9的应力水平, 10Hz、20Hz、30Hz的频率研究高延性纤维混凝土的疲劳强度、次数和寿命参数.根据疲劳累积损伤理论, 分析高延性纤维混凝土的拉压疲劳强度、变形的变化规律.试验结果表明, 重复荷载作用下高延性纤维混凝土疲劳破坏符合威布尔双参数分布, 并给出了相应的p-S-N方程.该研究结果可以为混凝土结构抗震设计、路桥的振动影响等分析提供依据.%The high ductile fiber concrete (HDFC) have good deformation capacity and fatigue resistance capacity, and can be used in big concrete engineering structure bearing the repeated loads. In order to study the fatigue properties, 54 specimens were made to conduct tension and compression fatigue test under constant amplitude loading. After testing the extreme value of static tensile strength, the fatigue life parameters of HDFC were studied by the stress level of 0.7, 0.8, 0.9, and the frequency of 10Hz, 20Hz and 30Hz. According to the fatigue cumulative damage theory, the law of fatigue strength and deformation of concrete is analyzed. The results show that the fatigue load is consistent with the Weibull two-parameter distribution, and the corresponding p-S-N equation is given. The research results can provide reference for the analysis of the seismic design of concrete structure and the vibration of bridge.