EVALUATION OF THE BRIDGE GIRDER ACTION FORCE CHARACTERISTICS FOCUSING ON PERIOD CHARACTERISTICS OF THE TOHOKU EARTHQUAKE TSUNAMI

Abstract

 In this research, we investigated the relationship between the tsunami acting force to the girder and the wave period of tsunami.
 Firstly, hydraulic experiment was conducted with the tsunami, which has a long wave period such as 15 min. As a result, the wave can be classified into steady flow type, and the horizontal acting force can be evaluated as a function of drag coefficient and velocity. Secondly, comparison with other experimental results was conducted, the relationship between the tsunami acting force and wave period of tsunami was obtained. Bore wave type tsunami are dominant in a wave tsunami., and steady flow type tsunami are dominant in a long period tsunami.