Development of Tsunami Analysis Method for Estimation of Damage of Evacuation Building by Tsunami Impacts


Tsunami evacuation buildings must have an enough performance to be proof against not only the earthquake, but also tsunami wave force. Numerical simulation is the useful tool used to estimate the risk of damage by analyzing the physical process of collapse of the building. In this simulation, the fluid and structure analysis method have to be coupled to interaction forces between their interfaces. And the structure analysis method is required the accurate damage estimating performance with dynamic collapse process of building. Also, the fluid analysis method is required the accurate solution with wave motion which changes dramatically such as breaking wave and hydraulic jump, and to have to consider the shape of building accurately.The purpose of this study is developing the tsunami analysis method for estimation of damage of tsunami evacuation building by tsunami impacts. In this paper, the interaction between fluid and structure interface was treated just one way (only from fluid to structure). Tsunami wave propagation is simulated by solving the three dimensional Navier-Stokes equation with free surface. The interface capturing technique based on volume of fluid (VOF) method is used to simulate the complicated shapes of free-surface. And the stabilized finite element method based on SUPG/PSPG method which provide the numerical stability is used to discretization of governing equation. Also, MPI and OpenMP parallelization with HPC techniques was implemented for large scale computation. For structure analysis method which is able to simulate the dynamic collapse process of damaged building, we used high accurate FEM with beam element so called ASI-Gauss method. We applied the present method to the simulation that tsunami wave attacks to tsunami evacuation building, and we compared the tsunami wave force with simplified estimation form.