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针对高速铁路上预应力混凝土声屏障结构中遇到的弯曲拉-压疲劳状态,进行4片预应力混凝土悬臂板的6个等幅反复荷载作用下的弯曲拉-压疲劳试验。在试验的基础上,给出相应的S-N方程,并将试验结果同其他文献结果进行比较,分析了混凝土的弯曲抗拉疲劳强度、预应力钢筋的有效预应力在反复荷载作用下的损失率。结果表明:混凝土弯曲拉-压疲劳性能优于其轴心拉-压疲劳性能;疲劳荷载作用而产生的有效预应力损失率在3%~6%。研究结果可为预应力混凝土结构的疲劳抗裂设计、分析提供依据。
According to the bending tension-compression fatigue conditions encountered in prestressed concrete acoustic barrier structures on high-speed railway, bending tensile-compression fatigue tests of four prestressed concrete cantilever plates subjected to six constant amplitude repeated loads were carried out. On the basis of the experiment, the corresponding S-N equation is given, and the test results are compared with those of other literatures. The flexural tensile fatigue strength of concrete and the loss rate of prestressing prestressing tendons under repeated load are analyzed. The results show that the flexural tensile-compressive fatigue behavior of concrete is better than the axial tension-compression fatigue behavior of the concrete. The effective pre-stress loss rate of fatigue load is between 3% and 6%. The results provide the basis for the fatigue cracking design and analysis of prestressed concrete structures.