In this study, the tensile strength, failure mechanism and ductile behaviour of geogrid-reinforced high-strength self-compacting concrete discs subjected to both the Brazilian tensile strength test and a biaxial compressive test are studied. To determine the combined effects of geogrid layer numbers and inclination angle on the ultimate tensile strength of concrete samples, 21 experiments were conducted with up to three layers of geogrids inclined at angles of 0° to 90°, at increments of 15°. In addition, discrete-element numerical simulations were conducted using two-dimensional particle flow code to examine the failure behaviour of geogrid-reinforced high-strength self-compacting concrete discs. The numerical models were first calibrated by the experimental results and then the failure behaviour of models containing geogrids was investigated. Both experimental and numerical results demonstrate that augmenting the concrete discs with geogrids increases the ductility of specimens, especially after failure. As the number of geogrid layers increased, the tensile strength of specimens also increased, whereas the tensile strength and absorbed energy were the same for specimens with different numbers of geogrid layers and inclination angles of 75° and 90°. The specimen with three horizontal geogrid layers had the highest tensile strength, biaxial compression strength and ductility of all specimens tested.

中文翻译：

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土工格栅加筋对高强自密实混凝土拉伸破坏的影响

在这项研究中，研究了土工格栅加固的高强度自密实混凝土圆盘在巴西抗拉强度试验和双轴压缩试验中的抗拉强度、破坏机制和延性行为。为了确定土工格栅层数和倾角对混凝土样品极限抗拉强度的综合影响，进行了 21 次实验，最多三层土工格栅以 0° 至 90° 的角度倾斜，增量为 15°。此外，使用二维粒子流代码进行了离散元数值模拟，以检验土工格栅增强的高强度自密实混凝土圆盘的破坏行为。首先通过实验结果对数值模型进行校准，然后研究包含土工格栅的模型的失效行为。实验和数值结果都表明，用土工格栅增强混凝土圆盘可以提高试样的延展性，尤其是在破坏后。随着土工格栅层数的增加，试件的抗拉强度也随之增加，而土工格栅层数和倾角为75°和90°的试件的抗拉强度和吸收能量相同。具有三个水平土工格栅层的试样在所有测试试样中具有最高的抗拉强度、双轴压缩强度和延展性。而土工格栅层数和倾角分别为 75° 和 90° 的试样的抗拉强度和吸收能量相同。具有三个水平土工格栅层的试样在所有测试试样中具有最高的抗拉强度、双轴压缩强度和延展性。而土工格栅层数和倾角分别为 75° 和 90° 的试样的抗拉强度和吸收能量相同。具有三个水平土工格栅层的试样在所有测试试样中具有最高的抗拉强度、双轴压缩强度和延展性。