The research on the explosive impact resistance of concrete structure is very important for military protection.Scholars at home and abroad have done a lot of research on the mechanism of improving the dynamic strength of concrete.However,most studies have explored the influence of a single factor on the dynamic strength of concrete,lacking research on the dynamic strength law of concrete under the coupling of multiple factors,and there is also limited research on the relationship between compressive dynamic strength and tensile strength of concrete.Through the uniaxial compression test and Brazilian disc splitting test of Hopkinson pressure bar tester,the compressive and tensile dynamic strength of concrete under different aggregate ratios and impact velocities are measured.Then the theoretical expression of concrete dynamic strength is obtained by studying and analyzing the test results,and the tensile and compressive dynamic strength of concrete is compared.It is found that the compressive dynamic strength of concrete is positively correlated with the aggregate ratio and impact velocity of concrete.With the increase of aggregate ratio,the smaller the impact velocity is,the greater the increase of compressive dynamic strength of concrete is.When subjected to dynamic load,the increase of the compressive dynamic strength of concrete is greater than that of the pull strength.
dynamic strength of concreteaggregate rateimpact velocityincrease rateHopkinson pressure bar test
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