Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

Acceleration amplification factors, which are variables used in the seismic design of power facilities installed inside substation structures, are presented in the seismic design standards of the United States (US), Japan, and Korea. Unlike the coefficients presented in the design standards of the US and Japan, those presented in domestic design standards can be obtained only by performing dynamic analysis when the substation structure has more than four floors. Because most substation structures in Korea have 4–5 stories, the existing acceleration amplification factor is insufficient to be applied to actual substation structures. To suggest an acceleration amplification factor suitable for domestic substation structure types, the acceleration amplification factor was evaluated for seven representative substation structures. The acceleration amplification factors were evaluated by constructing in-structure response spectra based on a study of far-field and near-fault earthquakes. In general, the acceleration amplification coefficients αJ and αA according to the US and Japan seismic design criteria tend to be overestimated compared with the acceleration amplification factors obtained through dynamic analysis based on the study of near-fault and far-field earthquakes.