Earthquake resistant design is evolutionary‘ and, a1though great progr않s has been made since seismic design was made mandatory by building α성es， it is still not completely understαxi . 1n this paper, a 10 story steel building is analyzed. and its results are compared by applying two different actual ground motions to the structure. 12 sets of Lorna Prieta, Ca1ifornia, earthquake data which occured in 1989‘ and recorded 7.1 on the Richter scale 킹ld 9 sets of Valparaiso, Chile, earthquake data which occured in 1985, and recorded 7.8 on the Richter scale were scaled to zone 2B level of UBC-88. By applying earthquake ground motions which had similar Richter scale magnitude, it was found that the Chile earthquake which had long duration of ground motion affected about twκe bigger thar: that of California earthquake which had relatively short duration of ground motion. 1n addition to the 야ak ground motion, the duration of the ground motion is a very important factor in structural design

• 김희철(삼성종합건설 기술연구소) | Kim Hee Cheul