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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：土木工程学报

卷号：49

期号：8

页面范围：53

ISSN号：1000-131X

摘要：Considering structure-ground dynamic interaction is consistently
   required in the seismic specifications of nuclear power station in
   different countries,and the reasonable simulation of dynamic
   characteristics of non-homogeneous ground is particularly one of those
   focuses. Based on the idea of applying the high artificial damping and
   then gradually extracting its influence through shifting the frequency
   axis,Damping Solvent Stepwise Extraction Method (DSSEM) is
   proposed,which can reduce the undesirable mutual restriction between
   high artificial damping and site size as much as possible. By coupling
   the upper nuclear island (NI) substructure,the seismic response analysis
   model for NI structures under complicated non-homogeneous site
   conditions can be established within the finite element framework.
   Furthermore,the corresponding implementation formula is provided for the
   convenience of development in the general finite element software. The
   dynamic analysis of massless square plate resting on homogeneous
   half-space ground and non-homogeneous layered ground were carried
   out,respectively,to verify the proposed computational model. The
   influence of local non-homogeneity in ground on the response of the NI
   structure was then discussed. The computational results indicate that
   the measured underground xenolith may have a slight influence on the
   seismic response of NI structure,and the proposed model appears to
   possess good accuracy and efficiency,so that it is applicable to
   nonhomogeneous ground with complicated geometry and structure.

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