NUMERICAL INVESTIGATION ON DAMAGE CAUSED BY FORCED DISPLACEMENT TO MAIN MEMBER OF WARREN TRUSS BRIDGE DUE TO GROUND DEFORMATION DURING EARTHQUAKE

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  • CHIDA Tomohiro
    東北学院大学 工学部環境建設工学科
  • NAKAZAWA Masatoshi
    東北学院大学 工学部環境建設工学科
  • WAKATSUKI Naoki
    東北学院大学 工学部環境建設工学科
  • MAGOSHI Kazuya
    株式会社地震工学研究開発センター
  • MATSUI Tomoki
    （前）東北学院大学 工学部環境建設工学専攻（研究当時） （現）大日本コンサルタント株式会社 構造耐震技術センター 耐震保全技術室

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Other Title
  • 地震時の地盤変動を想定した強制変位が主構に作用した場合のワーレントラス橋の損傷に関する数値解析的検討

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<p> In the Kumamoto earthquake in April 2016, the heavy damage of truss bridges caused by ground deformation was not reported, although many other types of bridges were seriously damaged due to ground change. However, as a result of continuous analysis of the case that the ground slides near the abutment, it has been found that a small amount of ground deformation can cause severe damage to lower member of truss bridge.</p><p> Thus in this study, we carried out elasto-plastic static analyses and seismic response analyses for Warren truss bridge at the time of ground deformation. At First, forced displacements in the compressive direction were applied to the lower members, and the damage and deformation of the truss bridge were investigated by elasto-plastic static analyses. Thereafter the seismic response analyses were carried out on the model with forced displacement as an initial imperfection, and it was confirmed how vulnerable Warren truss bridge was to seismic motion due to initial imperfection.</p>

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