Experimental Study On Dynamic Bihavior Of Large Aggregate Concrete Under Biaxial Tension-compression

Large aggregate concrete is widely used in hydraulic structures, such as dams, harbors and so on, these structures have large volume and work under complex loadings. A lot of static multiaxial compress researches have been done, but research of dynamic multiaxial stress states is less. So researches of large aggregate concrete under dynamic tension-compression have important theoretical significance and practical value for the nonlinear analysis of hydraulic structures. At the same time, the two graded wet screened concrete test was carried out, in order to compare the differences of the two kinds of concrete and provide reference for the two graded wet screened concrete test.In this article, experimental study on dynamic bihavior of three graded large aggregate concrete and two graded wet-screen concrete under biaxial tension-compression have been carried out on a servo-hydraulic multiaxial testing machine. This study based on the National Natural Science Foundation of China (51079019).strain rates are 10"5/s～10-2/s, stress ratios are-0.05,-0.1,-0.25,-0.5.The major research work are presented as follows:(1) Dynamic test of concrete under uniaxial tension stress state is carried out, concrete dynamic tensile strength、failure patterns and the influence of strain rate on dynamic tensile strength are obtained.(2) Dynamic test of concrete under biaxial tension-compression stress state is carried out, dynamic strength、failure patterns、park strain under different stress ratios and strain rates are obtained.(3) The dynamic failure criterion of the large aggregate concrete and wet-screened concrete in the principal stress space is established.