DYNAMIC RESPONSE AND DESIGN OF CONTINUOUS CONCRETE RAILWAY BRIDGES IN RESONANCE AREA

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  • SOGABE Masamichi
    社団法人 土木学会 (財) 鉄道総合技術研究所 鉄道力学研究部
  • MATSUMOTO Nobuyuki
    社団法人 土木学会 (財) 鉄道総合技術研究所 鉄道力学研究部
  • FUJINO Yozo
    社団法人 土木学会 東京大学 工学系研究科社会基盤工学専攻
  • WAKUI Hajime
    社団法人 土木学会 (財) 鉄道総合技術研究所 鉄道力学研究部
  • KANAMORI Makoto
    社団法人 土木学会 日本鉄道建設公団 設計技術室
  • MIYAMOTO Masaaki
    社団法人 土木学会 東海旅客鉄道株式会社 浮上式鉄道開発本部

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Other Title
  • 共振領域におけるコンクリート鉄道橋の動的設計法に関する研究
  • キョウシン リョウイキ ニ オケル コンクリート テツドウキョウ ノ ドウテキ セッケイホウ ニ カンスル ケンキュウ

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Abstract

Introduction of new high-speed trains and low stiffness girders such as PRC ones requires reviewing the present technical design standards of railway bridges and viaducts from a viewpoint of dynamic response of girders as well as of train run comfort. In this study, dynamic interaction of train and continuous concrete girders is formulated and parametric simulations are made extensively. The results are compared with the dynamic responses of 21 existing bridges and good agreement is presented. The resonance of the girder under the passage of train with the speed of 500km/h is also confirmed. The damping ratio of concrete girders is found to be as low as 0.01 and the value of 0.02 is suggested to use in simulations and design. Dynamic response of running trains is compared with the results of the field measurement of 17 bridges and good agreement is also found. The filed measurement shows that the maximum acceleration of trains during the passage of bridges is below 1.5m/s2, indicating good ride condition and implication of this result in conjunction with the design standards is discussed.

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