This paper presents results from an ongoing study on seismic soil-structure interaction (SSI) of a reactor building with a circular basemat supported by large number of concrete piles, performed within a seismic margin assessment (SMA) project. The objective of the study is to assess realistically kinematic and inertial interaction effects and to derive internal loads and floor-response spectra for the building structure. Transfer functions for the kinematic interaction motion (KIM) of the pile foundation for three different soil conditions are evaluated and compared with the free-field motion. Results derived by the subtraction method (SM) are verified by the modified subtraction method (MSM). Structure-soil-structure interaction (SSSI) effects with a neighboring building are also addressed through comparison of transfer functions for stand-alone and coupled modeling. Realistic evaluation of SSI effects on nuclear power plant (NPP) buildings supported by large pile foundations can substantially reduce over-conservatism in the design calculations and help identify additional seismic margin in a SMA.
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