桁衝突を許容した道路橋の耐震設計法の有効性に関する考察

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  • Consideration on effects of seismic design method of highway bridges allowing poundings of bridge girders
  • ケタ ショウトツ オ キョヨウ シタ ドウロキョウ ノ タイシン セッケイホウ ノ ユウコウセイ ニ カンスル コウサツ

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In this study, the effects of seismic design method of highway bridges allowing poundings of bridge girders were considered. Dynamic response analysis on medium size highway bridges was carried out by changing gap size at the ends of bridge girders and the maximum amplitude of the inputted wave on the case of no rubber shock absorber, and response stress and response velocity at the ends of bridge girders and response rotation angle at the pier bottom were calculated. Similarly, dynamic response analysis was carried out on the cases that rubber shock absorber was attached to the ends of bridge girders. The effects of gap reduction on dynamic response of the ends of bridge girders and the pier bottom were considered. As a result, it is clarified that seismic design method of highway bridges allowing the pounding of bridge girders is effective.

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