報告書番号

U05

タイトル（和文）

地盤－構造物系の動特性と動剛性の同定法

タイトル（英文）

THE MODEL AND SYSTEM PARAMETERS IDENTIFICATION METHOD FOR THE SOIL-STRUCTURE SYSTEM

概要 （図表や脚注は「報告書全文」に掲載しております）

重要な構造物の竣工後に実施する起振実験・地震観測により，構造物の耐震性と設計法や数値モデル妥当性の検証を行い設計資料の蓄積が図られる。このため，耐震研究室で実施した原子力発電所の起振実験・地震観測を通じて開発された実証的検討の手法を総合的にまとめた。記載内容は以下の通りである。■従来の研究の概要，■地盤－構造物系の相互作用を考慮しうる大規模な系の動特性と動剛性の同定理論，■同理論の数値計算による検証方法とその結果，■起振実験や地震観測結果のデータに関する監視機構を含む計測方法と伝達関数の演算手法，および■提案する手法の実在構造物（原子炉格納容器と典型的な原子炉建屋）への適用例と■まとめ。以上の検討を経て，提案する手法は構造物の耐震設計手法の精度向上と確立に有用であることを示した。

概要 （英文）

IN ORDER TO DEVELOP AND CERTIFY THE EARTHQUAKE RESISTANT DESIGN FOR A NUCLEAR POWER PLANT,SEVERAL FIELD INVESTIGATIONS SUCH AS EARTHQUAKE OBSERVATIONS AND FORCED VIBRARION TESTS ARE CARRIED OUT. THIS PAPER PRESENTS THE METHODS WHICH HAVE BEEN DVELOPED TO IDENTIFY THE MODEL AND SYSTEM PERAMETERS. THE METHODS HAVE BEEN APPLILD TO SOME NUCLEAR POWER PLANT AND VERIFIED FROM THE COMPARISON OF THE OBSERED RECORDS AND THE IDENTIFIED NUMERICAL MODELS. THE CONTENTS ARE AS FOLLOWS,(1)THE STATE OF ARTS. (2)THE IDENTIFICATION METHOD OF MODAL PARAMETERS(MODAL VECTORS AND EIGEN OPER-FREQUENCIES),AND SYSTEM PARAMETERS SUCH AS YOUNG S MODULI AND/OR THE MATERIAL DAMPING COEFFICIENTS ETC. IN ORDER TO PREVENT THE DIVERGENCE OF PARAMETERS,THE METHOD USES,(A)THE EXPECTIVE AND STANDARD DEVIATION OF THE PARAMETERS,(B)AN ESTIMETION METHOD OF ERROR WHICH OCCURS IN MODELING FOR THE OBJECT SYSTEM,(C)THE ARTIFICIAL RESTRAINT OF THE PARAMETERS,AND(D)SINGULAR VALUES DECOMPOSISION METHOD WHICH GIVES MAXIMUM EFFECT BY THE MINIMUM VARIANCES OF THE PERAMETERS. (3)THE EVALUATION OF THE METHOD S VELIDITY BY USING,(A)A NUMERICALLY GENERATED PERFECT MODEL,(B)A NUMERICALLY GENERATED DEFECTIVE MODEL,(C)AN ACTUAL TRANSMITTING TOWER AND SIMULAION MODEL WHICH IS OBTAINED BYREDUCING TO A SIMPLE MODEL FROM A FEM MODEL. (4)OBSERVATION AND TEST PROCESSING METHOD,AND DATA PROCESSING METHOD,WHICH CONTAINS A CALIBRATION METHOD OF AN UMBALANCED TYPE OF VIBRATOR,AN ESTIMATION METHOD OF FREQUENCY RESPONSE FUNCTION AND A MOINTOR SYSTEM. (5)THE APPLICATION TO THEEARTHQUAKE OBSERVATION AND THE FORCED VIBRATION TESTS OF THE ACTUAL NUCLEAR POWER PLANTS. FROM THE RESULTS OF THE TESTS,A SIMPLIFIED LUMPED MASS STICK MODEL FOR THE SOIL-STRUCTURE SYSTEM WAS IDENTIFIED,WHICH GIVES ACCURATELY THE DYNAMIC PROPERTIES OF THE DEEPLY EMBEDDED STRUCTURE.THE SSI NUMERICAL ANALYSES HAVE BEEN PERFORMED AND THE MODEL HAVE BEEN VERIFIED BY THE OBSERVED DATA.

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