Abstract
The estimation of basemat uplift is an important factor for the seismic design of the nuclear power plant buildings. Nevertheless, the behavior is still not understood well, especially concerning to the vertical motion of the building due to the uplift behavior (the induced vertical motion). In this paper, the applicability of the soil FEM model in the low the contact ratio area is studied by comparing the impulsive Green function method. Next, using the model, the mechanism of the occurrence of the vertical induced motion is explained. Then, the simple method to estimate the outline value is proposed and the efficiency of the method is studied.
