Estimation of Collision Force of a Drifted Container Due to Run-up Tsunami

摘要

In this study, characteristics of the run-up tsunami and behavior of drifted container are discussed based on laboratory and numerical experiments. Also, effectiveness of the vertical wall, which is installed in order to reduce damages due to tsunami, is investigated. This paper proposes empirical formula to evaluate wave force due to run-up tsunami considering the added mass, based on momentum theorem, and its validity is discussed. Moreover, the nonlinear finite element collision model, LS-DYNA3D, is used to estimate the collision time to determine the volume of the added mass. Through these discussions, validity of the numerical model and necessity of considering the added mass are confirmed. Furthermore, it is revealed that the velocity of the collision and the weight of the container are important parameters in estimating the collision force.