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对6根仅配置纵向CFRP预应力筋的钢纤维活性粉末混凝土(RPC)无腹筋梁试件进行了静力和疲劳试验,研究了RPC钢纤维含量、疲劳荷载水平、加载方式等参数对其疲劳性能的影响。结果表明:疲劳荷载作用下梁试件发生剪切破坏;无论是承受静力荷载还是疲劳荷载的梁试件,都不宜过高估计钢纤维的作用而取消抗剪腹筋;提高钢纤维含量可以显著改善梁试件的疲劳性能,钢纤维含量为3%的CFRP预应力筋RPC无腹筋梁,若RPC的主拉应力小于其抗拉强度的50%,可免于疲劳破坏;经回归分析,给出了试验梁的刚度退化方程及RPC主拉应力与疲劳寿命关系方程。
Six static strength and fatigue tests were conducted on six steel reinforced concrete (RPC) reinforced concrete beams with only longitudinal CFRP prestressing tendons, and the effects of RPC steel fiber content, fatigue load level and loading method on fatigue were studied The impact of performance. The results show that the beam specimens under shear load are damaged by shear stress. It is not appropriate to overestimate the effect of steel fibers on the beam specimens subjected to static load or fatigue load and to eliminate the shear force on the beam specimens. The steel fiber content can be significantly increased The fatigue behavior of beam specimens is improved. CFRP prestressed reinforcement bars with 3% steel fiber content have no web reinforcement. If the primary tensile stress of RPC is less than 50% of its tensile strength, fatigue failure can be avoided. After regression analysis, The stiffness degradation equation of the test beam and the relation equation between RPC principal tensile stress and fatigue life are presented.