Abstract: In order to investigate the basic dynamic behavior of ordinary concrete, by using hydraulic servos and material shearing equipment, five kinds of different loading strain rates were set up to test the compression behavior, tensile strength and shear dynamic performance of ordinary concrete, and the failure behavior and stress-deformation curves of concrete under different loading modes were obtained. According to the stress-deformation curve, the peak stress and corresponding deformation characteristic parameters of different loading conditions were extracted to analyze the dynamic performance of the concrete under three different stress modes. The results show that there are obvious dynamic effects on the compression, tension and shear of the concrete, and the failure mode is affected by the dynamic force. With the increase of the strain rate, the peak stress of the concrete under the three stress modes is obviously increased. The influence of strain rate on the tensile loading mode is the most obvious; the peak deformation of concrete under different loading modes is affected by the loading strain rate, and the peak deformation under compression and tension is not affected by the loading strain rate. Under the action of shear load, the bending and rotation effects gradually increase with the increase of the loading strain rate, which leads to the gradual increase of shear peak deformation. According to the mathematical regression analysis of the test data in this paper, the linear relationship between the logarithm of the peak stress and the strain rate of the concrete under pressure, tension and shear force is linear.
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2019, Vol. 33 
