Dynamic Responses of a Sliding Base-isolated RLSS Considering Free Surface Liquid Sloshing

Free surface liquid sloshing is an important characteristic of LSS (liquid storage structure) under the action of earthquake. The velocity potential function considering free surface liquid sloshing is obtained, and the fluid dynamics problem is solved based on Navier-Stokes equation. The dynamic responses of the system are comparatively studied considering free surface liquid sloshing or not. The results show that, when free surface liquid sloshing is considered, structural slippage is decreased while structural acceleration, effective stress, base shear force, and liquid pressure are increased significantly. Free surface liquid sloshing has a great influence on distributions of dynamic responses along the wall height, and distribution and size of tensile stress of the wall are significantly affected by free surface liquid sloshing. Regardless of whether free surface liquid sloshing is considered or not, the first principal stress, effective stress and liquid pressure are all increased with the increase of liquid level height, and the influence of free surface liquid sloshing also increases with the increase of liquid level height. Without considering free surface liquid sloshing, the structural slippage will be overestimated and the other dynamic responses of the system will be underestimated.