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Title Evaluation of Embedment Effect in Soil-structure Interaction Analysis Considering Dynamic Characteristics of Nuclear Power Plant Structure and Soil
Authors 양기윤(Ki-Yun Yang) ; 송종걸(Jong-Keol Song) ; 김재석(Jae-Suk Kim)
Page pp.437-447
ISSN 1229-5515
Keywords 지반-구조물 상호작용; 묻힘효과; 유연체적 부분구조법; 원자력 발전소 soil-structure interaction; embedment effect; flexible volume substructure method; nuclear power plant
Abstract The current regulatory guidelines and design criteria for nuclear power plant (NPP) structures, it's call for reflection of the embedment effect which is consider the separation of the lateral soil and the structure in the soil-structure interaction (SSI) analysis of partially embedded structures. To reflect this, a fragmentary criteria was proposing that is suggesting that the non-contact with a part of the embedding depth is assumed, or the effective stiffness by embedding is reduced by changing the characteristics of the soil. In order to evaluate the current embedment effect criteria, SSI analysis was performed considering 3 types of embedment conditions, 6 types of generic soil models, and 5 types of structural models. For the SSI analysis, the ACS SASSI program using the flexible volume substructure method was used, and the artificial acceleration time history which conforms to the NPP design criteria was used for the design input motion. As a result of the SSI analysis, the floor response spectra of the structure and the relative displacement of the each floor to the foundation were analyzed and the embedment effect was evaluated. From the results of the analysis, it can be observed that the possibility of conservative design is increased when applying the embedment effect guidelines according to the current Nuclear Regulatory Guidelines.