Experimental study on the uniaxial dynamic tensile properties of concrete

Concrete structures are unevitably subjected to dynamic loads.The mechanical properties of concrete under dynamic loads differ from that under static loads greatly.In order to investigate the dynamic tensile properties of concrete,dynamic tensile tests of concrete specimens(C40) are carried out on MTS,with the uniaxial strain rate ranging from 10-5 /s ~ 10-2 /s.The tensile properties of concrete under different stain rates,which include tensile strength,elastic modulus and peak strain,are studied systematically.The effect law of strain rates on the tensile strength,elastic modulus and etc.of high strength concrete are analyzed.The test results indicate that the tensile strength and elastic modulus would increase with the strain rate increasing.The discreteness of Poisson's ratio is larger,and there has not obviously changeing formula.The stress-strain curves under dynamic tensile loads is similar to that under static loads.These findings can provide us with some technical parameters for the design of concrete structure.