VELOCITY-BASED DESIGN OF SEISMIC UNSEATING PREVENTION CABLE AND SHOCK ABSORBER FOR BRIDGES

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  • TAKENO Shinobu
    社団法人 土木学会 建設技術研究所 東京本社道路・交通部 立命館大学大学院社会人博士課程
  • OHNO Hiromi
    社団法人 土木学会 立命館大学大学院 理工学研究科
  • IZUNO Kazuyuki
    社団法人 土木学会 立命館大学 理工学部土木工学科

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Other Title
  • 作動速度に基づく落橋防止用連結ケーブルと緩衝材の設計法に関する研究
  • サドウ ソクド ニ モトヅク ラッキョウ ボウシヨウ レンケツ ケーブル ト カンショウザイ ノ セッケイホウ ニ カンスル ケンキュウ

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Abstract

This paper proposed the rational design method of seismic unseating prevention cables for bridges based on their response velocity. The present design load of unseating prevention cable is determined based on the beam weight and the dynamic response of the bridge is not taken into account. In this paper, the demand strength and the sectional area for the unseating prevention cable were derived from the law of conservation of energy. Then, the shock stress was calculated for the designed cable, as its activation should cause the shock wave. Furthermore, the rigidity of the shock absorber was derived based on the cable rigidity and the limitation of its deformation. The numerical simulations also were conducted to estimate the efficiency of the proposed method. The results showed that the cables designed by the proposed procedure were fit to prevent the girder from unseating.

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