Abstract
Effects of foundation rotation on seismic inertia forces are studied in two different plane strain finite element investigations. A three-mass model is used to approximate the dynamic characteristics of a containment vessel of a nuclear power plant and its internal structure. In the first study a large finite element mesh is specified in order to eliminate unwanted reflections from the boundary. Motion input to the structure is limited to 2 sec duration. A quiet boundary technique is employed in the second investigation. As a result, earthquake motion inputs of any duration could be specified. Most results are based on portions of two recorded earthquake motions of 4 sec in length. Effects of foundation rotation and lateral soil-structure interaction are evaluted with program output. Results are presented in graphs and tables.
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