DYNAMIC SOIL-STRUCTURE INTERACTION FOR NUCLEAR POWER PLANT

Abstract

In recent year, seismic analysis of axis-symmetric structures, such as nuclear power plants, cooling towers, chimneys, prcssure vessels, subjected to dynamic loading has attracted considerable attention. Basic thcme of this dissertation is in the analysis of nuclear power plant structures. The structural safety of nuclear reactor building during expected earthquake motion is of great importance in view of possibility of radiation hazards. The massive structure interacts with the surrounding soil, leading to further modification of the seismic motion at the base. Thus the structural response may be affected by the interact ion with the soil. Also there will be a feedback froun structure into the soil. In this report, a model has been taken to analyse the response of the system at various nodes, considering, without embedment and with embedment effect with three boundaty conditions i.e. elementary, viscous and Kelvin clement. For time history of maximum acceleration, 0.13g applied at the base of the system and analysis has been completed to get the response. Only response of acceleration at node C is plottC(l and effect of embedment has been investigated. Non-linear behaviour of soil has been analysed through Mohr-Coulomh model and effect of embedment is compared with linear model of soil. Further, 3D model has also been performed and its response is compared with 2D response.