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Science and Technology of Nuclear Installations
Volume 2011 (2011), Article ID 948457, 6 pages
Research Article

Seismic Analysis of the Transportation Portal by the Combined Asymptotic Method

11-119 Slaviansky Boulevard, Moscow 121352, Russia
2JSC Atomenergoproject, Moscow, Russia

Received 6 May 2011; Accepted 17 August 2011

Academic Editor: Leon Cizelj

Copyright © 2011 Alexander Tyapin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The author extends the previously proposed combined asymptotic method (CAM) of seismic SSI analysis for the multi-support systems and applies it to the transportation portal as a double-support system (together with the reactor building). The key issue is the development of the structural dynamic stiffness matrix condensed to the supports by the modal approach. Then the condensed structural matrix is combined with the soil dynamic stiffness matrix also condensed to the rigid basements. As a result, a very simple linear system 1 2 1 2 is solved in the frequency domain. This gives the transfer functions from the free-field motion to the motion of the basements. The only important limitations are the linearity of the soil’s and structure’s properties and the rigidity of the basements. The results for the sample system are checked against the full SASSI solution. The results can be used to justify the further simplification of the system.