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Seismic response characteristics of nuclear island structure at generic soil and rock sites

Earthquake Engineering and Engineering Vibration 2023年第3期22卷 667-688页

作者： Lv Hao Chen Shaolin Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China College Resources Shandong University of Science and TechnologyTai’an 271019China

The number of traditionally excellent coastal lithologic nuclear power plants is *** is a trend to develop nuclear power plants on soil sites in inland ***,the seismic safety and adaptability of non-rock nuclear power plant(NPP)sites are the key concerns of nuclear safety *** the five site categories are clearly defined in the AP1000 design control documents,the effects of nuclear power five site conditions and soil nonlinearity on the seismic response characteristics of nuclear island buildings have not been systematically considered in previous related *** this study,targeting the AP1000 nuclear island structure as the research object,three-dimensional finite element models of a nuclear island structure at five types of sites(firm rock site(FR),soft rock site(SR),soft-to-medium soil site(SMS),upper bound soft-to-medium site(SMS-UB),and soft soil site(SS))are *** partitioned analysis method of soil-structure interaction(PASSI)in the time-domain is used to investigate the effects of site hardness and nonlinearity on the acceleration,displacement,and acceleration response spectrum of the nuclear island structure under seismic *** incremental equilibrium equation and explicit decoupling method are used to analyze the soil nonlinearity described by the Davidenkov model with simplified loading-reloading *** results show that,in the linear case,with the increase of site hardness,the peak ground acceleration(PGA)and the peak of acceleration response spectrum of the nuclear island structure increase except for the FR site,while the maximum displacement *** nonlinear analysis,as the site hardness increases,the PGA,maximum displacement,and the peak of acceleration response spectrum of the nuclear island structure *** peak value of the acceleration response spectrum in the nonlinear case is greater than that in the linear case for FR,while smaller for SR and soil *** site nonlinear

关键词： partitioned analysis for SSI site conditions nuclear structure explicit-implicit integration scheme incremental algorithm for nonlinear analysis

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analysis of nonlinear soil-structure interaction using partitioned method

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SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 2022年 162卷

作者： Lv, Hao Chen, ShaoLin Nanjing Univ Aeronaut & Astronaut Coll Aerosp Engn Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut Dept Civil & Airport Engn Nanjing 211106 Peoples R China

For the current state-of-practice in soil-structure interaction (SSI) of nuclear facilities, the strain-dependent characteristics of soil are considered indirectly via equivalent linear methods in the frequency domain, typically represented by the SASSI program. SSI analysis in the time-domain, although directly involving material nonlinearity of the soil, is inefficient in practice up to now. Based on Partitioned analysis of SSI (PASSI), a method for nonlinear soil-structure interaction analysis is developed in this paper, by applying implicit time-step integration and explicit one with different time steps to nuclear island and to soil, respectively. The incremental equilibrium equation and explicit decoupling method are used to analyze the soil nonlinearity described by the Davidenkov model with simplified loading-reloading rules, which avoids solving algebraic equations and iteration processes. An asynchronous parallel algorithm for nonlinear SSI analysis is given. A simple example is given to verify the partitioned approach with explicit-implicit co-computation against the full-explicit approach. Seismic response characteristics of nuclear power plants are investigated by comparing responses of nonlinear analysis with linear analysis. Different results address the importance of nonlinear SSI analysis for the seismic performance of nuclear structures.

关键词： Partitioned analysis for SSI Parallel algorithm Explicit-implicit integration scheme Davidenkov model incremental algorithm for nonlinear analysis

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