Study on Dynamic Mechanical Properties of Concrete under Impact Load
In order to investigate the dynamic mechanical properties of concrete under impact load,fi-nite element analysis software was used to simulate the SHPB tests of C30,C40 and C60 concrete under different impact velocities.The stress-strain curves and energy time-history curves at different velocities were obtained by numerical simulation,and the crushing process of the specimen was analyzed.The re-sults show that the peak stress of C40 concrete and C60 concrete is 20.8%and 31.6%higher than that of C30 concrete,respectively.Improving the strength grade of concrete can improve the impact resistance of concrete structure.When the impact velocity is 10m/s and 15m/s,the strain rate of concrete is 3.2 and 4.7 times that of 5m/s,respectively,indicating that concrete is a strain rate-sensitive material.The ener-gy time history curve is generally divided into three stages:the initial stable stage,the mid-term growth stage,and the final stable stage.Under impact load,concrete breaks from the edge from outside to inside first,and splits inside.
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