水下混凝土梁静力和疲劳性能试验研究

摘要

通过水下钢筋混凝土梁和普通钢筋混凝土梁的静载和等幅疲劳荷载试验,分析了水下混凝土梁的变形性能和抗弯疲劳性能,比较了它与普通混凝土梁变形性能的差异.试验结果表明,水下混凝土梁在疲劳荷载作用下,正截面平均应变基本符合平截面假定;随着循环次数的增加,其裂缝宽度逐渐增大,刚度逐步降低,其变化规律与普通混凝土相似,但其裂缝宽度明显较大,而刚度降低的幅度略小一些,不过两者刚度相差不大.%The comparative experiments between underwater reinforced concrete beams and normal reinforced concrete ones under static loading and fatigue loading with constant amplitudes were carried out in this paper. The deformation behavior and bending fatigue behavior of NDC beams were analyzed. The differences of deformation property between NDC beams and NC ones were compared. The experiment results showed that the normal section average strain plane of NDC beams basically corresponds to section assumption under fatigue loading. With the increase of cycle times, the crack width gradually increased and the stiffness gradually reduced. The development law of NDC beams' crack and deflection were similar to NC beams. But the crack width of NDC beams was greater, and stiffness reduction slightly smaller, however, their stiffness was basically the same.