Study on dynamic mechanical properties of early aged steel tube concrete
In order to study the impact resistance of early aged steel tube concrete,the dynamic mechanical properties of C50 and C30 core concrete steel tube concrete were studied based on the Hopkinson pressure bar test system.The research results showed that the degree of damage,dynamic peak stress,dynamic peak strain,and absorption energy proportion of steel tube concrete were positively correlated with the impact air pressure;The degree of damage to steel reinforced con-crete gradually changes from gentle to severe,manifested as surface detachment,cracking,and internal fragment detach-ment,which is positively correlated with the design strength of concrete but negatively correlated with age;When the im-pact pressure is the same,the dynamic peak strain,peak stress,and proportion of absorbed energy of steel reinforced con-crete are positively correlated with the design strength and age.The peak strain is more affected by the design strength,and the proportion of peak stress and absorbed energy is more affected by the age,that is,the actual strength of the core concrete.
steel reinforced concretedynamic mechanical propertiesSHPBenergy dissipation law
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