RISKY HIGH-RISE BUILDINGS RESONATING WITH THE LONG-PERIOD STRONG GROUND MOTIONS IN THE OSAKA BASIN, JAPAN
The Osaka Basin, western Japan, is a typical sedimentary basin. It is composed of thick soft sediments with the maximum thickness of the sediments 3 km in the sea zone and 1.8 km in the plain zone. This geologic circumstance results in the prevalence of long-period (above 1sec) strong ground motions with long-lasting duration of several minutes in earthquake motions inside the basin. To mitigate earthquake damage to long natural-period structures due to the next M8 class interplate earthquakes, Nankai and Tonankai earthquake, we make the map of the predominant period of surface waves in the Osaka Plain by using the three-dimensional basin model. This map enables us to pick up high-rise buildings that may be resonant with the long-period strong ground motions, and to give a warning to reinforce them. We draw the conclusion that high-rise buildings in the height range between 150 and 300m are risky in the Osaka City, and the number of them was 16 in 256 buildings (about 6%).
Long-period strong ground motion The Osaka Basin Surface wave Predominant period High-rise buildings
K. Miyakoshi M. Horike
Earthquake Engineering Group, Geo-Research Institute, Osaka, Japan Professor, Faculty of Engineering, Osaka Institute of Technology , Osaka, Japan
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）