Experimental Study on Fluid Force Acting on a Bridge Deck Subjected to Plunging Breaker Bores and Surging Breaker Bores

Abstract

In this study, hydraulic experiments were carried out to clarify a tsunami wave load on a bridge deck, focusing on the variation of horizontal wave force effected by the change of deck position from still water level against the tsunami height. The values of averaged drag coefficient were calculated by using the measured maximum lateral force and tsunami velocity as 1.52 subjected to surging breaker bores and as 1.56 subjected to plunging breaker bores. In addition, the variation of horizontal wave force is more sensitive in the case that still water level is lower when a bridge deck is subjected to plunging breaker bores.