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本文通过对铁路桥梁所用的钢筋活性粉末混凝土(RPC)道砟槽板进行疲劳性能试验研究和有限元模拟分析,检验其疲劳承载力是否满足列车活荷载的要求。首先通过材料试验获得RPC的基本力学性能,然后采用疲劳试验机对RPC道砟槽板中央集中加载进行疲劳性能试验,试验结果表明:钢筋RPC道砟槽板的裂缝发展阶段可分为三阶段;与普通混凝土板相比,第一阶段占总疲劳寿命的比例提高了5%,第二阶段道砟槽板的抗疲劳开裂性和带裂纹疲劳工作性能表现优于普通混凝土板;RPC消除粗骨料和加入了钢纤维是其疲劳性能提高的原因。最后利用有限元软件ANSYS对PRC道砟槽板的疲劳性能进行分析,分析得到的结果与试验结果一致,说明钢筋RPC混凝土道砟槽板的疲劳承载力可以满足列车活荷载的要求。
In this paper, RPC fatigue test and finite element analysis of reinforced concrete reactive powder concrete (RPC) slab used in railway bridges are carried out to test whether the fatigue capacity meets the requirements of train live load. First of all, the basic mechanical properties of RPC were obtained through the material test. Then, the fatigue test was carried out by using the fatigue testing machine on the central concentrated loading of RPC channel plate. The experimental results show that the development of the RPC channel can be divided into three stages: Compared with ordinary concrete slab, the proportion of the first stage in the total fatigue life increased by 5%, the second stage slab slab slab fatigue crack resistance and fatigue performance than the performance of ordinary concrete slab; RPC to eliminate coarse Material and joined the steel fiber is the reason for the improvement of its fatigue performance. Finally, the finite element software ANSYS is used to analyze the fatigue behavior of PRC slats. The analysis results are in good agreement with the experimental results, which shows that the fatigue capacity of RPC slab can meet the live load requirements.