震源特性の不確定性を含む地震波群による建築物の応答評価

Seismic response evaluation of structure incorporated uncertainties of seismic source 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

モンテカルロシミュレーションに基づいた多様性に富む時刻歴地震波群を用いた地震応答解析によって、原子力施設の耐震安全性をより高精度に評価する試みがなされている。これまでに、敷地の地震ハザードに適合し、震源特性と関連づいた時刻歴地震波群を作成しており、本発表では、それらの地震震群のうちひとつの震源から得られた地震波群に着目して、震源特性の不確定性が地震動強さ指標や建物最大応答に対してどの程度の影響があるのかを分析した結果を報告する。

In the probabilistic risk assessment for nuclear power plant, methods based on Monte Carlo Simulation of response analyses with variously simulated ground motion time histories have been conducted. In the preceding study by Nishida et al. (2013), the ground motion time histories, which are consistent with the seismic hazard and are associated with seismic-source characteristics, were generated. In this context, the authors conducted response analyses of structures with generated ground motions from a seismic source contained seismic-source characteristics uncertainties. The response analyses were conducted for a simple multi-mass system supposing a RC structure. The relationships between seismic-source characteristics and ground-motion intensities as well as the relationships between seismic-source characteristics and structural responses were examined.