報告書番号

384023

タイトル（和文）

ＪＰＤＲ（動力試験炉）を対象とした構造物－地盤系の動特性（５）構造物－地盤系挙動の数値模擬

タイトル（英文）

SOIL-STRUCTURE INTERACTION OF JPDR REACTOR (5) -NUMERICAL SIMULATION OF SOIL-STRUCTURE INTERACTION

概要 （図表や脚注は「報告書全文」に掲載しております）

原子力発電所の第四紀地盤立地の成立性に関してはその耐震性実証が最大の課題であり，類似構造物による実証資料の蓄積が不可欠である。当該構造物は砂と砂礫による深い埋込部を有しているため，地盤－構造物系のモデル化手法，数値解析手法の検証を，起振実験と地震観測の結果を用いて実施した。その結果，地中に深く埋設されている構造物の地震時応答は，起振実験により得られる相互作用ばねを含む構造物モデルと自然地盤モデルの各部分系を柔積法により結合して数値模擬することができ，伝達関数の計算結果は観測結果とかなり良く一致する。また本手法による検討の結果，地盤に深く埋設された構造物の地震時挙動は周辺地盤の動特性に大きく依存することが明らかとなった。これらの成果は，構造物と自然地盤の的確なモデルがあれば相互作用を含む地震応答を深い埋込部がある構造物に関しても数値解析しうることを示しており，耐震設計の合理化に資する。

概要 （英文）

IN ORDER TO DEVELOP THE ASEISMIC DESIGN FOR THE NUCLEAR POWER STATION CONSTRUCTED ON THE QUARTERNARY GROUND, SEVERAL EXAMINATIONS HAVE BEEN CARRIED OUT FOR THE JPDR(JAPAN POWER DEMONSTRATION REACTOR)IN TOKAI VILLAGE UNDER THE CO-WORKS OF CRIEPI AND JAERI(JAPAN ATOMIC ENERGY RESEARCH INSTITUTE.) THIS PAPER REPORTS THE MODEL OBTAINED THE DATA REDUCTION METHOD FOR JPDR STRUCTURE, THE INTERACTION SPRING CONSTANT AND ITS SURROUNDING GROUND AND THE RESPONSES OF THE MODEL BEING COMPARED WITH THE MEASURED RESPONSES DURING THE FORCED VIBRATION TESTS AND THE EARTHQUAKES. THE RESULTS ARE SUMMERIZED AS FOLLOWS. (1)THE STRUCTURE WAS MODELLED BY LUMPED MASSES WHICH ARE CONNECTED BY A SIMPLIFIED BEAM EACH OTHER. THE RESPONSE OF THE MODEL AT EACH MEASURING POINT AGREES NEARLY PERFECTLY WITH THE MEASURED ONE. (2)THE SHEAR VELOCITIES AND Q VALUES OF THE SURROUNDING SOIL LAYERS WERE IDENTIFIED USING THE SEVERAL EARTHQUAKE RECORDS IN THE SAME MANNER. THE TRANSFER FUNCTIONSWITH THE PREDOMINANT FREQUENCIES AS 4,8,13 HZ OF THE MODEL AGREE WITH THE MEASURED WELL AND THE DYNAMIC CHARACTERISTICS ARE WELL REPRESENTED BY A SIMPLE MULTIPLE REFLECTION MODEL. (3)IN ORDER TO SIMULATE THE BEHAVIORS OF THE STRUCTURE DURING EARTHQUAKES, THE TRANSFER FUNCTIONS ARE CALCULATED USING THE MODELS AND SO-CALLED FLEXIBLE BOUNDARY SUPER-POSED METHOD. THE CALCULATED ONES AGREED WITH THE OBSERVED ONES WELL EXCEPTTHE BEHAVIOR NEAR 8 HZ, AND THE FUNDAMENTAL DYNAMIC CHARACTERISTICS OFTHESTRUCTURE AND THE GROUND ARE WELL REPRESENTED BY THESE MODEL AND THE NUMERICAL ANALYSIS FOR THE EMBEDDED STRUCTURE WERE VERIFIED IN THIS CASE.

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