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EXPERIMENTAL STUDY ON BEHAVIOR OF PRE-STRESSED CONCRETE UNDER FLEXURAL TENSION-COMPRESSION FATIGUE LOADING
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摘要: 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。Abstract: The fatigue tests of flexural tension-compression under constant amplitude cyclic loading have been carried out on pre-stressed concrete cantilever plates against the fatigue state of flexural tension-compression in pre-stressed concrete noise barrier used in high-speed railway.The results of the tests have been presented in the relationship of S-N and compared with those obtained by other researchers.It is also analyzed that tensile fatigue strength of the concrete and the loss rate of effective pre-stress under cyclic loading based on the results of the experiment.The results show that the fatigue capacity of concrete under flexural tension-compression is better than that under axial tension-compression.The loss rate of effective pre-stress under cyclic loading ranged from 3%～6%.The results of investigation furnish the evidence for the design and analysis of fatigue crack resistance for pre-stressed concrete structure under cyclic loading.
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Key words:
- high-speed railway /
- noise barrier /
- pre-stressed concret,e fatigue /
- crack resistance /
- normal section /
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