Abstract
Safety related structures of a nuclear power plant are often required to withstand the effects of an aircraft impact load. Underground tunnels, carrying cables and pipes between buildings, also belong to this class of structures. For the design of components located inside the tunnels one must know the response of the structure of the connection points of the components. Acceleration response spectra and relative displacements are of major interest. Using finite element techniques in order to idealize the tunnel and the surrounding soil the effects of the various parameters on the dynamic response of the tunnels are investigated. It is found that some of the main parameters which influence the dynamic response of a tunnel are: soil stiffness and layering, depth of embedment and the thickness of the concrete, protective slab. Vertical accelerations are also affected by the stiffness of the tunnel.
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