DYNAMIC RESPONSE OF BRIDGES OF WHICH HORIZONTAL INERTIA FORCE IS DISTRIBUTED BY MEANS OF STOPPERS

DOI Web Site 2 References
  • SAKAI Junichi
    (独)土木研究所 構造物メンテナンス研究センター 橋梁構造研究グループ
  • ANDO Shigeyoshi
    大日本コンサルタント(株) 保全エンジニアリング研究所
  • HOSHIKUMA Jun-ichi
    (独)土木研究所 構造物メンテナンス研究センター 橋梁構造研究グループ

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Other Title
  • 耐震補強として支承部に水平力分担構造を設置した橋の地震応答特性

Description

In seismic retrofit design of an existing multi-span continuous bridge, it is one way that horizontal inertia force of a superstructure can be distributed to a column with a movable bearing support by installing stoppers at the column top in order to reduce inertia force induced into a column with a fixed bearing support. To investigate dynamic response and develop a design method for bridges of which inertia force is distributed by mean of stoppers, a series of nonlinear dynamic response analyses was conducted.<br> Because stoppers are generally installed at the column top with a certain gap between the superstructure and the bridge column, impact force is induced to the superstructure and the column when the gap is closed during earthquake excitation. In the analyses, modeling of impact spring of stoppers, amount of gap, the effect of shock absorbers are considered as parameters. It is found from the analyses that large impact force, which is eight times larger than flexural strength of the column, is obtained if no shock absorber is considered, and it is effective to provide a shock absorber that has relatively large initial stiffness in order to mitigate this impact force.

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