PRESSURE CHARACTERISTICS OF RECTANGULAR SECTION GIRDER BRIDGE DUE TO TSUNAMI

It is necessary to study the precise pressure on a girder surface to clarify the tsunami action on bridges. This paper shows the pressure distribution and the mechanism of tsunami external force for the basic bridge section model from experiments. The mechanism of tsunami external force was estimated from the pressure distribution. The counterclockwise moment was generated on the bridge immediately after a tsunami action, because the negative pressure were induced on undersurface lower stream side of the model and the positive pressure were induced on the undersurface upper stream side.