部分预应力活性粉末混凝土梁的疲劳性能试验研究

Research on fatigue performance test of partial prestress Reactive Powder Concrete

通过对3根部分预应力RPC梁的疲劳试验进行不同加载次数和不同荷载下梁裂缝宽度和挠度的分析,得出试验梁的疲劳破坏过程大致分为裂缝衍生阶段、疲劳稳定阶段、疲劳破坏阶段等3个阶段,预应力度的增加有利于缓和梁的疲劳破坏,对梁斜裂缝的发展具有一定的抑制作用,梁的疲劳刚度随着预应力度的增大而增大,并且增大的幅度随着疲劳次数的增加而降低。

According to the analysis of width and deflection of beam span under various loading times and different loadings of the fatigue tests on three partial prestressed RPC beam,the paper concludes the three stages,the crack derived stage,fatigue stability stage,and fatigue failure in the fatigue damage process of the test beams,indicates the increasing prestress degree relieves the beam fatigue failure and restrain the develop-ment of beam cracks,and illustrates the beam fatigue stiffness increases along with the improved prestressed degree and its increasing range lowers along with the added fatigue times.