지반 임피던스 함수를 고려한 원전 구조물기반 질량집중모델에 대한 시간영역 지진응답해석

Abstract

In this paper, a seismic analysis method of nuclear reactor containment buildings (RCBs), considering both soil-structure interaction (SSI) and structural nonlinearity, is proposed and verified. To consider the SSI effect, a frequency-dependent soil impedance function is calculated and transformed into an impulse response in the time domain, which is applied to the structure in sway-rocking model form. Seismic analysis of the structure considering structural nonlinearity is then conducted in the time domain. As a structural model, a beam-stick model based on OPR1000, an in-service RCB in Korea, is used. The IMK hysteretic model is adopted for seismic analysis to consider the structural nonlinearity of the RCB, which is mainly composed of concrete shear wall. Three different soil profiles are used for the comparison, and a series of analyses are performed with PGA = 0.3 g and 2 g. The seismic responses of the structure are represented as in-structure response spectra and compared.