Numerical simulation on impact resistance of steel fiber reinforced high strength concrete
1.School of Civil Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China; 2.Earthquake Engineering Research Test Center, Guangzhou University, Guangzhou, Guangdong 510405, China
Abstract：By explicit dynamic finite element software of LS-DYNA, the split hopkinson pressure bar(SHPB) impact experiment of steel fiber reinforced high strength concrete(SFRHSC) were numerically simulated. Elastic-plastic hydrodynamic model and Hooke′s law were adopted to describe the constitutive relations of concrete and SHPB, respectively. The reinforcing and toughening effects of steel fiber on concrete were characterized by strength and failure strain of SFRHSC, respectively. The results show that internal stress of specimens oscillate initially before reaching stress equilibrium. Failure process of specimens are slightly delayed to their peak stress. The fracture of specimens matrix are more severe than that of SFRHSC specimens at any time. At the same impacting velocity, the cracks propagate in SFRHSC specimen with overall unchanged shape, while the specimens matrix are broken into many pieces. The numerical simulation results exhibite good consistency with those of experiment, and can basically reflect the characteristic of dynamic load and specimens failure during SHPB impact experiment.
2012, Vol. 33 
