This study proposes a calculation scheme which enables us to estimate the collision time and force of a container drifted by run-up tsunami. Simulated behaviors of the drifted container by a run-up wave are found to be in good agreement with the laboratory experimental results.A set of these calculated values are used as the initial values of the fluid-structure interaction analysis which simulates the collision of the drifted container. It is confirmed from these simulations that the added mass (water mass at the rear of the container) plays an important role on the collision and predicted collision force and time reached equilibrium state as the model accounts for adequate volume of water in the rear of the drifting container. Moreover, the effect of the added mass on the collision force and time is verified in full scale collision simulation.