津波作用時に沿岸構造物の配置が岸側の構造物に与える影響に関する研究  [in Japanese] STUDY ON EFFTCTS OF THE ARRANGEMENT OF RIGID STRUCTURES ALONG COASTS ON LANDWARD BUILDINGS DURING TSUNAMI  [in Japanese]

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Abstract

津波避難ビル等の構造物とその海側に別の構造物が立地する状況に津波を作用させた3次元数値解析を行い,沿岸構造物の配置が陸側構造物に作用する津波力に与える影響を考究した.その結果,陸側構造物に作用する最大波圧の鉛直分布は静水圧に近い勾配を有するが,陸側構造物がない場合に対する浸水深の増幅率は沿岸構造物の配置の影響を強く受けることから,既往の算定式を上回る場合があることを確認し,沿岸構造物を考慮した解析を行い波圧を算定することの重要性を示した.また,陸側構造物に作用する津波力を効果的に低減できる沿岸構造物の配置が存在することを確認し,沿岸と陸側の構造物の距離が異なることによる津波力の変化は,沿岸構造物の間隔が等しい条件では,陸側構造物がない状態における運動量の変化量で概ね把握できることを示した.

 Tsunami-induced wave pressure and force acting on an instrumented specimen fronted by macroroughness elements are investigated numerically in terms of the arrangement of the macro-roughness elements. Numerical results show that the arrangement of the macro-roughness elements affects an increase rate of the inundation depth relative to the absence of the specimen, and accordingly exsisting formulae can underestimate the vertical distribution of the maximum wave pressure acting on the specimen. This suggests that it is essential to consider the arrangement of the macro-roughness elements when evaluating the wave pressure. Furthermore, it is found that the the change in the tsunami force acting on the specimen with the alongshore spacing of the macro-roughness elements constant can be evaluated by the momentum of the water mass in the absence of the specimen.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 69(2), I_287-I_292, 2013

    Japan Society of Civil Engineers

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