Abstract
This paper explains a method for studying the behavior of a nuclear plant or any other structure submitted to an earthquake excitation. The method used is called the “direct method” because the structure is at first cut into several rigid bodies which have the same total mass and which are attached to each other and to a rigid soil by shear and rotational springs and dampers. The springs are calculated in such a manner that the static deflection of the model and that of the real plant are both equal. The model is obviously able to take the same deflections or mode shapes as the real plant. Then dynamic equations are set up and solved by the Runge and Kutta Method giving the time history response of each part of the system to the acceleration of soil. Applications of this method have been made to two nuclear power plants, St.Laurent des Eaux and Phenix fast reactor.
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