Investigation on Building Damages due to the 1999 Chi-Chi，Taiwan Earthquake

平成11年(1999年)9月21日午前1時47分に台湾中部南投鯨集集付近を震源とする大規模な地震が発生した。この地震により震源に近い台湾中部の台中懸、南投懸付近を中心として、死傷者約10,000人、建物全半壊約20,000棟に及ぶ被害が発生した。筆者らは地震発生直後の9月23日から26日の4日間、最も被害が激しい被災地域の一つである台中懸を中心に建物の被害調査を行った。本稿は、この被害調査から特徴的な被害の概要を報告するとともに、台湾地震で観測された強震記録と兵庫県南部地震で観測された強震記録を用いて、地盤－建物相互作用系の振動モデルにより動的解析を行い、その応答特性より被害モードの考察を実施したものである。The large-scale earthquake was occurred in Taiwan at 21 September, 1999 (local time, 1:47a.m.) and its epicenter was located c10se to Chi-Chi, Nantou County, middle part of Taiwan Island. The magnitude of this large-scale earthquake is estimated ML7.3 by CWB and MS7.7 by USGS and named the Chi-Chi, Taiwan Earthquake. The total number of death and injured people was about 10,000 and the total number of heavily and middle damaged buildings was about 15,000 concentrated in Taichung and Nantou County, middle part of Taiwan due to the Chi-Chi, Taiwan Earthquake. We had a brief damage investigation of buildings，du ring 4days from 23 to 26 September, just after the occurrence of this earthquake, mainly in Taichung County where is the one of the most severe damaged area and the many destroyed buildings were concentrated. In this paper, we reported the investigated results about the building damages quickly and analytical results about the building damages using soil-structure interaction numerical models considering the soft-first story effect and building height which are assumed to be same conditions in height and scale to the actually damaged buildings. And using 3 types of strong motion records which have different spectral characteristics observed at near field in the Chi-Chi, Taiwan Earthquake and also the strong motion record observed at JMA Kobe in the Hyog-Ken-Nanbu Earthquake, we calculated the floor response due to each input of strong motion records. We indicated the results and considered the damaged mode of buildings from these response characteristics