Modeling of Tsunami Fluid Forces Acting on a Bridge Deck

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  • 橋桁に作用する津波波力のモデル化

Abstract

Based on analysis of data from hydraulic experiments for bridge deck models with or without overhangs, tsunami fluid forces acting on a bridge deck subjected to surging waves on dry bed were idealized by analyzing the relations between tsunami fluid forces and four dominant parameters: tsunami inundation depth, increase rate of tsunami inundation depth, tsunami velocity, and wave celerity. Normalized horizontal pressure acting on a bridge deck without overhangs was 1.16 times higher than those with overhangs in the range of Fr =1.80 which is a higher Froude number. Normalized vertical pressure is classified into five categories from μ1 to μ5 in the time series: μ1 occurred only for the model with overhangs, μ2 without overhangs showed higher values than μ2 with overhangs in the range of less than Fr =1.50, μ3 without overhangs varied from negative to positive values in the range of Fr =1.00 to Fr =1.80, μ4 and μ5 which mean vertical pressure on bridge deck in quasi stationary stage were nearly close to both models with or without overhangs.

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