Numerical Simulation of Dynamic Response of Concrete Subjected to Internal Load of Blast

It is still difficult to give the all-sided and accurate description of explosion damaging effects according to experiment. In this paper, by using nonlinear dynamic finite-element program ANSYS/LS-DYNA, which can deal with fluid-solid coupling algorithm, dynamic response of concrete subjected to internal blast loading such as development of cavitations was simulated. The size of the blast pit, the damage area, pressure contour and stress-time curve in concrete with or without steel composite were analyzed. Also, the damage mechanism of concrete-steel plate composition under explosive loading was studied. Research showed that the fluid-solid coupling algorithm can avoid element abnormality and mesh vanishing, and also improve the efficient. The calculated results described the concrete breakage of the center blasting cavity compression and the free surface tension spalling, which were in agreement with the theoretical results. Synchronously, due to the steel plain reinforcing, the steel plate composite can decrease the pull stress and restrain the development of crack, thereby the capability of the prevent-collapse and integrality of the structure will be improved.