Impact Action Between Concrete Blocks in Collapse Analysis of Reinforced Concrete Structures

During the collapse analysis of reinforced concrete structures, the impact action between concrete blocks is significant in the process of the large deformation. Based on the impulse-response rigidity, the method treating impact action between concrete blocks is presented, in which the rotation of the blocks is considered. The behavior of the different impact modes between concrete blocks is studied based on the experiments and the numerical tests. Firstly, the face-to-face central impact experiments with 30 couple of concrete cubic blocks are performed using a pendulum test system and a drop weight test system. Then the experimental processes are recurred by the finite element code LS-DYNA. And the extended and the supplementary numerical tests for face-to-face central impact are carried out respectively, considering the change of the experimental parameters and the other parameters which are not designed in the experiments. Furthermore, the numerical tests for face-to-face noncentral impact, line-to-face impact, point-to-face impact, line-to-line impact and the numerical tests that are to study the influence of the shape of concrete blocks are performed. In the end, the impulse models describing the behavior of the different impact modes between concrete blocks are derived from the results of the experiments and the numerical tests.