抄録
The feasible seismic performance of most of existing buildings in Japan is uncertain because the current seismic code does not specify the performance, itself.
This paper conducted earthquake response analysis of low-rise, mid-rise, and high-rise reinforced concrete buildings designed by Lateral Load Carrying Capacity considering the precise site amplification effect. The total number of site analyzed was 118 in Metropolitan area.
The paper also discussed the seismic performance of buildings systematically from the viewpoint of site class, structural characteristic factor, height of buildings, etc... based on the analytical results.
The major findings obtained in this paper were as follows
1) In the case structural characteristics factor was the same, the maximum drift angle at the site of site classes 2 and 3 showed a significant difference for each site. The difference was especially significant in the low-rise buildings. Site amplification characteristics of the vibration characteristic coefficient in site class 2 and 3 almost did not match to those of the actual sites. Particularly, Site amplification characteristics of low-rise buildings did not. On the other hand, the maximum drift angle of most of the buildings in site class 1 showed little difference in every site.
2) Except for the sites with extremely long predominant period, the maximum drift angle of mid-rise and high-rise buildings were hardly affected by the structural characteristic factor. On the other hand, the response of low-rise buildings were significantly affected by the structural characteristic factor.
3) Compared to the buildings designed by Ds=0.3 with limit drift angle of 1/30, the buildings designed by Ds=0.45 with limit drift angle of 1/120 exceeded the limit drift angle in many sites.
4) The sites generating large maximum drift angle in metropolitan area located along the Tokyo Bay (analysis site name, Kawasaki, Yokohama, Urayasu, Chiba, Anesaki, Kisarazu, and Kyonan), the eastern area of Saitama (Kuki, Kasukabe, Omiya, and Kawaguchi), and the eastern coastal areas of Chiba (Misaki and Kamogawa). On the other hand, the sites generating small maximum drift angle generally located in Tochigi, Gunma, Ibaraki.
