EFFECT OF BACKFILL SOIL CONDITIONS ON SEISMIC RESPONSES OF PRESTRESSED CONCRETE FRAME BRIDGE WITH DIAGONAL MEMBERS

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  • 斜材付きπ型ラーメン橋の地震応答に及ぼす斜材背面地盤条件の影響に関する遠心模型実験

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<p> Backfill conditions of diagonal members is not taken into consideration on seismic design of prestressed concrete frame bridge with diagonal members (FBwD, here after). To clarify its effects on seismic responses, centrifuge experiments, focused on soil-structure interaction between a diagonal member and its backfill during earthquake, were conducted.</p><p> Followings are outcomes of experiments. (1) Seismic responses of FBwD are different from its general design model, which exclude effects of backfill of diagonal members. (2) Effect of backfill can be considered in frame analyses with adopting soil-structure interaction springs installed on diagonal members. (3) For suitable estimation of seismic response of FBwD, evaluation of nonlinear characteristics of backfill soil springs are important.</p>

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