The concrete compression strength is an effective characteristics among other properties of practical significance. Although coring testing on such members as columns is not recommended. But sometimes, for determining the concrete strength in the column, this method should be applied to the reinforced concrete one. Coring in a reinforced concrete column creates a cylindrical cavity in it, which has an apparently negative effect on the bearing capacity of the structural member. The effect of different sizes of cavities on uniaxial compression strength of concrete was investigated based on the experiment and numerical simulation (particle flow code). The results of the experiments show that the cavities have a great influence on the uniaxial compression strength. For example, if the cavity volume is calculated about 14% of the sample volume, it can reduce of the uniaxial compression strength down to 58%. If the cavity diameter is 60% of the sample width, the strength can go down to 74%.

中文翻译：

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通过实验结果和数值模拟评估混凝土试样的抗压强度

混凝土抗压强度是具有实际意义的其他性能中的有效特性。尽管不建议对诸如列之类的成员进行取芯测试。但有时，为了确定柱中的混凝土强度，应将此方法应用于钢筋混凝土。钢筋混凝土柱中的取芯会在其中产生一个圆柱形空腔，这显然对结构构件的承载力产生负面影响。基于实验和数值模拟（颗粒流代码），研究了不同大小的孔洞对混凝土单轴抗压强度的影响。实验结果表明，空洞对单轴抗压强度影响很大。例如，如果计算出的腔体体积约为样品体积的14％，它可以将单轴压缩强度降低到58％。如果型腔直径是样品宽度的60％，则强度会降低到74％。