The current study investigated the effect of geogrid reinforcement on the fatigue behavior of concrete beam specimens in terms of the development of strains at the compressive zone. The concrete beam specimens having the dimensions of 150 mm × 150 mm × 550 mm were either unreinforced, reinforced with one layer of triaxial geogrid or reinforced with two layers of triaxial geogrid. The strains at the compressive zone of specimens were measured using strain gauges (SGs) fixed at two locations. The SGs of the first location were placed at the top of the specimens. The SGs of the second location were placed at 13 mm from the top of the specimens. The concrete beam specimens were tested under cyclic four‐point bending loads with a frequency of 7 Hz. The cyclic four‐point bending loads were carried out under a load control with a sinusoidal waveform for several stress levels. Test results indicated that triaxial geogrid reduced the average strains at the compressive zone by about 16% of the concrete beam specimens reinforced with one layer of geogrid and by about 25% of the concrete beam specimens reinforced with two layers of geogrid in comparison with unreinforced concrete beam specimens. The average rate of strain development at the compressive zone of geogrid reinforced concrete beam specimens was significantly lower than that of the unreinforced concrete beam specimens. In addition, the strains at the compressive zone of the concrete beam specimens reduced with increasing the number of geogrid layers.

中文翻译：

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土工格栅加固对混凝土路面受压区应变的影响

当前的研究从压缩区应变的发展角度研究了土工格栅加固对混凝土梁试样疲劳性能的影响。尺寸为150 mm×150 mm×550 mm的混凝土梁试件要么不进行加固，要么用一层三轴土工格栅进行加固，要么用两层三轴土工格栅进行加固。使用固定在两个位置的应变仪（SGs）测量样品压缩区的应变。第一个位置的SGs放置在标本的顶部。第二个位置的SG放置在距样品顶部13毫米处。混凝土梁试样在频率为7 Hz的循环四点弯曲载荷下进行了测试。循环四点弯曲载荷是在载荷控制下以正弦波形对几个应力水平进行的。测试结果表明，与未加固的混凝土相比，三轴土工格栅将压缩层的平均应变降低了约16％的一层土工格栅加筋的混凝土梁样本，以及约25％的由两层土工格栅加筋的混凝土梁样本。梁标本。土工格栅钢筋混凝土梁样本压缩区域的平均应变发展速率显着低于未钢筋混凝土梁样本。另外，随着土工格栅层数的增加，混凝土梁试件受压区的应变减小。测试结果表明，与未加固的混凝土相比，三轴土工格栅将压缩层的平均应变降低了约16％的一层土工格栅加筋的混凝土梁样本，以及约25％的由两层土工格栅加筋的混凝土梁样本。梁标本。土工格栅钢筋混凝土梁样本压缩区域的平均应变发展速率显着低于未钢筋混凝土梁样本。另外，随着土工格栅层数的增加，混凝土梁试件受压区的应变减小。测试结果表明，与未加固的混凝土相比，三轴土工格栅将压缩层的平均应变降低了约16％的一层土工格栅加筋的混凝土梁样本，以及约25％的由两层土工格栅加筋的混凝土梁样本。梁标本。土工格栅钢筋混凝土梁样本压缩区域的平均应变发展速率显着低于未钢筋混凝土梁样本。另外，随着土工格栅层数的增加，混凝土梁试件受压区的应变减小。