Seismic response of a reactor building on rocky foundation

The seismic response of a reactor building on a rocky foundation has been studied by the finite element model. The influence of base fixity, inertia of foundation, stiffness of internal structure and foundation rock properties is studied on the seismic response. The conclusions of this study are summarised as follows: the response due to one mode alone is found to be significant in the case of rocky foundation; the foundation - structure interaction has relatively small contribution to the total response; the consideration of inertia of foundation may lead to very high seismic respones. More realistic method of considering inertia effect of foundation is therefore necessary; the increase in the elasticity of foundation by one hundred percent does not cause variations in vertical stresses in the outer and inner shells by more than 10 percent