Seismic soil-structure interaction of a nuclear building: Comparison of two different methods

摘要

This paper presents the computation of response spectra for a nuclear building, including seismic soil-structure interaction (SSI), using two different methods. To do so, established computer programs like the SASSI computer code and ABAQUS with Infinite Elements are used. The SASSI computer code is based on the Thin Layer Method developed by Lysmer et al. (1981) as a method for computations in the frequency domain. The calculations here are realized with the enhanced efficient SASSI 2010 by Ostadan et al. (2012). Another method, known as the Lysmer damper and also developed by Lysmer and Kuhlemeyer in 1969, is implemented in ABAQUS and called Infinite Elements. These elements contain values for the boundary damping effect. Considering linear elastic material behavior close to the boundary, both methods transmitted and absorbed all normally incoming plane body waves. The paper then discusses the results of the response spectra obtained by the two methods. This comparison assesses the viability of the methods. It also discusses the 'accuracy' of the results in terms of efficiency and compares computation times and pre-processing times.