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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