報告書番号

N10020

タイトル（和文）

固体廃棄物貯蔵ドラム缶の地震時転倒耐力の検討（その２）－数値解析によるドラム缶の質量分布と多列連成作用の影響評価－

タイトル（英文）

Evaluation of Overturning Capacity of Low level Radioactive Waste Drum during Earthquake(Part2)-Investigation of Drum Weight Distribution effect and Drum Columns Interaction by Numerical Analysis-

概要 （図表や脚注は「報告書全文」に掲載しております）

振動台によるドラム缶の転倒実験結果に基づき作成した二次元個別要素法の数値解析モデルを用いて、3段積みおよび4段積みドラム缶の地震時転倒に関するケーススタディーを実施し、質量分布と多列連成作用がドラム缶の転倒耐力と対策の効果に及ぼす影響について検討した。高さ方向の質量分布を変えた解析結果を、ドラム缶の重心高さと地震時変位の関係として整理し、転倒耐力に応じた限界の重心高さを把握した。多列配置にした場合の転倒耐力は、個々の列が単独で立っている場合の転倒耐力を上まわることを把握した。また、パレットの連結とドラム缶の固縛による現行の転倒防止対策についてその効果を確認した。

概要 （英文）

Numerical analysis case study is carried out for three layered and four layered low level radioactive waste drums by numerical models based on the results of shaking table test. First of all, numerical analysis results about drums displacement due to uplift and sliding on pallets during earthquake are compared with the experimental results and it is shown good agreement in both results. By this analytical model effects of drum weight distribution along height direction and drum columns interaction followed by each other drum's collisions on overturning capacity during earthquake are researched. From numerical analysis results the limit acceleration which is minimum value of input acceleration at storage building floor when three layered or four layered waste drums overturn is researched. It is shown that overturning capacity during earthquake decline when height of gravity center of three layered and four layered drums get large. So it is available to get down height of gravity center by controlling drum weight distribution along height direction. And as effect of drum columns interaction it is indicated that overturning capacity of single column arrangement drums is larger than that of many columns arrangement drums because phase deference between drum columns occur and decrease vibration amplitude by each other collisions.

報告者

キーワード