ハザード適合地震波による一般構造物の応答解析,2; 地震波および構造特性による建物応答のばらつき性状

Dynamic analysis of structures with hazard consistent ground motions, 2; Varieties of structural response by structural characteristics and/or ground motion characteristics

五十嵐 さやか*; 坂本 成弘*; 高田 毅士*  ; 西田 明美  ; 村松 健*

Igarashi, Sayaka*; Sakamoto, Shigehiro*; Takada, Tsuyoshi*; Nishida, Akemi; Muramatsu, Ken*

地震PRAの高度化を目的として解放基盤における最大加速度が7001,100cm/sとなるハザード適合地震波200波を作成した。本報では、既報の地盤特性および建物モデルを用いた地震応答解析を実施し、震源特性と地震動特性の関係および震源特性と建物応答の関係を明らかにするとともに、地震動特性のばらつきおよび構造特性のばらつきが建物応答に及ぼす影響について検討した結果を示す。

For next-generation probabilistic risk assessment of nuclear plant, the authors proposed a methodology where hazard-consistent ground motions generated by Monte Carlo simulation were used for response analysis. In the preceding study, 200 ground motions were generated in the PGA range of 700 to 1,100 cm/s. In this context, the response analysis of multi-mass system supposing a RC structure was conducted to reveal the relationship between seismic-source characteristics and seismic intensity as well as the relationship between seismic-source characteristics and structural response. It was found that stress drop and high-frequency cut filter have high correlation with peak ground acceleration. On the other hand, the stress drop has high correlation with structural response, while high-frequency cut filter has low correlation with structural response. The reason of these results was explained from the point of seismic source acceleration spectra.