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为研究经受疲劳荷载作用后活性粉末混凝土(RPC)的剩余抗压强度变化规律,对3组共24个RPC圆柱体试件,进行疲劳试验研究。通过静载试验建立RPC抗压强度和谐振频率之间的关系,推算出各疲劳试件的初始抗压强度;在此基础上,对RPC试件进行轴压单级和两级疲劳加载试验,并实测试件在疲劳荷载作用一定次数后的剩余抗压强度。实测结果表明:RPC在单级疲劳后剩余抗压强度的衰减率随循环寿命比的增大而减小,而衰减速率则随着循环寿命比的增大而增大。根据实测值得到RPC单级和两级疲劳加载后剩余抗压强度衰减率与循环寿命比之间关系的拟合公式,计算结果与实测结果吻合良好。
In order to study the residual compressive strength variation of RPC after fatigue loading, a total of 24 RPC cylindrical specimens from 3 groups were subjected to fatigue test. Through the static load test, the relationship between compressive strength of RPC and resonant frequency was established, and the initial compressive strength of each fatigue specimen was deduced. On this basis, the RPC specimens were subjected to single-stage and two- And measure the remaining compressive strength of the specimen after fatigue loading a certain number of times. The measured results show that the attenuation rate of residual compressive strength of RPC decreases with the increase of cycle life, while the decay rate increases with the increase of cycle life. According to the measured values, the fitting formula of the relation between the decay rate of residual compressive strength and the cycle life ratio after single-stage and two-stage fatigue loading is obtained. The calculated results are in good agreement with the measured results.