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配管の多入力応答に関する研究; 多入力配管解析の検証

Study on piping response under multiple excitation; Validation for multiple excitation analysis of piping

甲斐 聡流*; 渡壁 智祥; 金子 尚昭*; 都知木 邦裕*; 森泉 真; 月森 和之

Kai, Satoru*; Watakabe, Tomoyoshi; Kaneko, Naoaki*; Tochiki, Kunihiro*; Moriizumi, Makoto; Tsukimori, Kazuyuki

原子力プラントにおける配管系は、複数のフロア、複数の建屋にまたがり配置される。地震時には、1本の配管系であっても設置場所に応じた個々の異なる地震動が入力される。本研究では、上記のような多点入力条件となる配管系の解析手法を、加振実験との比較により検証した。その結果、多点入力時刻歴解析は、加振実験結果での応答履歴及び最大応答量を精度よく再現できた。一方、多点入力応答スペクトル解析では、多点入力の組合せ法として、SRSS法よりも絶対値和法を用いることが適切であることがわかった。

The piping in a nuclear power plant is laid across multiple floors of a single building or multiple buildings which support the piping at many points. As the piping is excited by multiple-inputs from the supporting points during an earthquake, seismic response analysis by multiple excitations is needed to obtain the exact seismic response of the piping. However, only a few experiments involving such multiple excitations have been performed to verify the validity of multiple excitation analysis. To perform rational seismic design and evaluation, it is important to investigate the seismic response by multiple excitations and to verify the validity of the analytical method by multiple excitation tests. This paper reports the validation results of the multiple excitation analysis of piping compared with the results of the multiple excitations shaking test using triple uni-axial shaking table and a 3-dimensional piping model.

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