An analytical study about dynamic failure mechanism of anchorage zone of cocrete embedded anchor bolt

Many bridges were seriously damaged by the Higashi Nihon Earthquake Disaster on March 11, 2011. Especially, bridge restrainer systems on the concrete pier were failed due to the anchorage zone's fracture. In general, dynamic failure of concrete under impact force loading is quite different from static failure. However, number of studies about damage mechanism caused by impact force between concrete and anchor bolts is few. Therefore, for the purpose of prevention a bridge restrainer system from collapsing by unexpected impact force, it is very important to consider of dynamic failure of concrete and evaluate the possibility of brittle failure. In this paper, in order to grasp impact failure condition such as corn failure and bond failure of anchor bolt embedded in concrete, we conducted dynamic pullout test with 3D FE analysis. In particular, to confirm the validity of FE analysis, at first we checked failure mechanism of anchor bolt embedded in concrete and compared the strength of them with experimental result in the static pullout test. Next, dynamic pullout simulations using the bond failure criteria and the strain rate effect of concrete are examined. Consequently, proposed method could simulate dynamic failure of anchor bolt in the previous experiments.