STUDY ON THE EVALUATION OF DAMAGE LEVELS OF RC RIGID FRAME RAILWAY BRIDGES IN THE CASE OF EARTHQUAKES

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  • SEKI Masaki
    東海旅客鉄道株式会社技術開発部
  • NISHIMURA Akihiko
    (株) ジェイアール総研エンジニアリング
  • SANO Hiroyuki
    (株) ジェイアール総研エンジニアリング 社団法人土木学会
  • NAKANO Satoshi
    社団法人土木学会 (株) 福山コンサルタント東日本事業部

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Other Title
  • RCラーメン高架橋の地震時損傷レベルの評価に関する研究
  • RC ラーメン コウカキョウ ノ ジシンジ ソンショウ レベル ノ ヒョウカ ニ カンスル ケンキュウ

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Abstract

If railway bridges suffer damages by earthquakes, appropriate train control and repair work according to damage levels have to be determined. In this study, a new method to evaluate the damage levels of RC rigid frame bridges is suggested. The decrease in stiffness of the bridge under damages and decrease in the natural frequency with increase in response ductility factor were grasped using the reversal cyclic loading test for half-scale model of the standard type rigid frame bridges of the Tokaido Shinkansen. As a result, it was found possible to evaluate the damage level of bridges by measuring their natural frequency using the dynamic percussion test. And a new rational method to evaluate the damage levels from decrease rate in stiffness of bridges obtained through frequency analysis and response ductility factor calculated by push over analysis of structural members is proposed. These proposed methods were erified through the site tests of the real railway bridge planned to be removed.

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